CH 107 FINAL

31) How many grams of a 23.4% by mass NaF solution is needed if you want to have of NaF? A) 55.9 B) 31.1 C) 13.1 D) 239 E) none of the above

D

32) How many moles of NaF are in 34.2 grams of a 45.5% by mass NaF solution? A) 0.814 B) 75.2 C) 15.6 D) 0.371 E) none of the above

D

33) What is the molarity of a solution prepared by dissolving 10.7g NaI in 0.250L? A) 42.8 B) 0.0714 C) 2.86 D) 0.286 E) none of the above

D

34) Which of the following items is a pure substance? A) air B) seawater C) brass D) ice E) none of the above

D

13) The correct decimal representation of 1.201 × 10-7 is: A) 12010000 B) 0.0001201 C) 0.0000001201 D) 1201.000 E) none of the above

C

18) How many grams are in 1.48 × 107 μg? A) 1.48 × 103 B) 1.48 × 1013 C) 1.48 D) 14.8 E) none of the above

D

19) How many milliliters are in 17.5 L? A) 175 B) 1.75 × 10-2 C) 1.75 × 103 D) 1.75 × 104 E) none of the above

D

20) How many microliters are in 41.0 mL? A) 4.1 × 103 B) 4.1 × 1010 C) 0.041 D) 4.10 × 104 E) none of the above

D

24) How many cm3 are there in 1.25 ft3? A) 38.1 B) 5.49 × 103 C) 246 D) 3.54 × 104 E) none of the above

D

3) The definition of a scientific law is: A) the same as a hypothesis. B) a way of learning that emphasizes observation and experimentation. C) the underlying reason for a scientific theory. D) a number of similar observations generalized into a brief statement summarizing past observations and predicting new ones. E) none of the above

D

30) What is the mass percent of a sodium fluoride solution prepared by dissolving 0.64 moles of sodium fluoride into 63.5g water? A) 26.9% B) 42.3% C) 70.3% D) 29.7% E) none of the above

D

Convert 1.88×10-6 g to each unit. micrograms

1.88 micrograms

Convert 1.88×10-6 g to each unit. mg

1.88 x 10^-3mg

Convert 1.88×10-6 g to each unit. cg

1.88 x 10^-4cg

Convert 1.88×10-6 g to each unit. kg

1.88 x 10^-9 kg

Convert 1.88×10-6 g to each unit. ng

1.88 x 10^3

A block of metal has a volume of 13.4 in3 and weighs 5.14 lb. What is its density in grams per cubic centimeter (1 lb = 453.6 g ; 1 in = 2.54 cm)?

10.6 g/cc

9.704 x 5.903 x (5.489 - 5.11)

22

3013.2 mL of Hg contains how many kg? (13.6g/cm^3)

41.2kg

27-21.95

5

27 x 21.95

590

What is the density (g/cm3 ) of an object that has a mass of 0.0314 kilograms and, when placed into a graduated cylinder, causes the water level to rise from 28.9 mL to 33.1 mL?

7.45g/cc

12) If the solubility of sodium chloride is 36 grams per 100 grams of water, which of the following solutions would be considered unsaturated? A) 5.8 moles of NaCl dissolved in 1 L of water B) 3.25 moles of NaCL dissolved in 500 ml of water C) 1.85 moles of NaCl dissolved in 300 ml of water D) none of the above

A

123) What type of reaction is the generic equation A+ B -> AB? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

A

130) What is the limiting reactant for the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) Al B) O2 C) Al2O3 D) both Al and O2 E) not enough information

A

136) The reaction for the oxidation of NH3 is given as: 4 NH3 + 5 O2 → 4 NO + 6 H2O Under certain conditions the reaction will proceed at 29.8% yield of NO. How many grams of NH3 must be made to react with excess oxygen to yield 70.5 g of NO? A) 134 B) 237 C) 21.0 D) 2.37 E) none of the above

A

138) How many moles of NH3 can be produced by the reaction of 2.00 g of N2 with 3.00 g H2? Reaction: N2(g) + 3 H2(g) → 2 NH3(g) A) 0.143 B) 0.0567 C) 0.235 D) 1.00 E) none of the above

A

14) How many significant digits should be reported in the answer to the following calculation? (4.3 - 3.7) × 12.3 = A) 1 B) 2 C) 3 D) 4 E) none of the above

A

141) Which is the excess reactant in the following reaction given that you start with 15.5 g of Na2S and CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) Na2S B) CuSO4 C) Na2SO4 D) CuS E) not enough information

A

23) How many cm3 are there in 2.5 m3? A) 2.5 × 106 B) 2.5 × 10-2 C) 2.5 × 102 D) 2.5 × 10-6 E) none of the above

A

28) Given the density of Au is 19.3 g/cm3, determine the mass of gold (in grams) in a block with the dimensions of 10.0 in × 4.00 in × 3.00 in. A) 3.80 × 104 B) 102 C) 2.32 × 103 D) 0.161 E) none of the above

A

35) Given that you wished to use exactly 0.325 mole of NaCl to prepare a 2.50 M NaCl solution, how many milliliters of solution must you prepare? A) 130. mL B) 0.130 mL C) 7.69 mL D) 0.813 mL E) none of the above

A

38) How many grams of KCl are needed to make 50.0g of 2.45M KCl? A) 9.13 B) 1.52 C) 91.3 D) 0.123 E) none of the above

A

39) How many grams of LiF would be present in 575 mL of 0.750 M LiF solution? A) 11.2 B) 0.0338 C) 1.12 × 104 D) 19.9 E) 33.8

A

40) What mass (in grams) of fructose (C6H12O6) is contained in 125 mL of a 0.500 M fructose solution? A) 11.3 B) 11300 C) 721 D) 0.0625 E) 180.

A

46) How many liters of a 2.18 M solution can be made from 200g K2S? A) 0.832 B) 1.81 C) 0.252 D) 1.20 E) none of the above

A

46) What is the value of 335 K on the Celsius temperature scale? A) 62 B) 167 C) 608 D) 66.4 E) none of the above

A

50) What volume of 12.0 M HCl is required to make 75.0 mL of 3.50 M HCl? A) 21.9 mL B) 0.560 mL C) 257 mL D) 560. mL E) none of the above

A

51) What volume of 9.00 M nitric acid is needed to make of solution? A) 903 mL B) 1.73 L C) 1.10 L D) 748 mL E) none of the above

A

11) If the solubility of sodium acetate (Molar mass = 82 g/mol) is 76 grams per 100 grams of water, which of the following solutions would be considered supersaturated? A) 8.5 moles of sodium acetate dissolved in 1 L of water B) 5.5 moles of sodium acetate dissolved in 500 mL of water C) 1.8 moles of sodium acetate dissolved in 300 mL of water D) 1.2 moles of sodium acetate dissolved in 200 mL of water E) none of the above

B

126) What type of reaction is the generic equation AB-> A + B ? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

B

129) Consider the following generic chemical equation: 2W + 3X → 3Y + Z When 5 units of W and 6 units of X are allowed to react, the limiting reactant would be: A) W B) X C) Y D) Z E) There is no limiting reactant in this situation.

B

13) The solubility of Pb(NO3)2 is 55 grams per 100 g H2O at 20°C. Which term would properly describe a solution where 44 grams of Pb(NO3)2 is added to 100 grams of water at this temperature? A) insoluble B) unsaturated C) saturated D) supersaturated E) none of the above

B

131) What is the excess reactant for the reaction below given that you start with 10.0 grams of Al and of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) Al B) O2 C) Al2O3 D) both Al and O2 E) not enough information

B

132) How many moles of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 0.396 B) 0.185 C) 0.741 D) 5.00 E) not enough information

B

135) A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO. Calculate the percent yield. Reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O A) 15 % B) 30% C) 60% D) 70% E) none of the above

B

137) How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 8.90 B) 10.1 C) 1.1 D) 14.6 E) not enough information

B

139) Calculate the maximum number of grams of NH3 that can be produced by the reaction of of N2 with 3.00 g H2. Reaction: N2(g) + 3 H2(g) → 2 NH3(g) A) 0.964 B) 2.43 C) 4.00 D) 17.0 E) none of the above

B

142) Which is the limiting reactant in the following reaction given that you start with of 15.5 Na2S and 12.1 CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) Na2S B) CuSO4 C) Na2SO4 D) CuS E) not enough information

B

147) Many metals react with halogens to give metal halides. For example, 2 Al (s) + 3 Cl2(g) → 2 AlCl3 (s) If you begin with 13.5 g of aluminum: A) you will need 23.6 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. B) you will need 53.2 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. C) you will need 26.6 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. D) you will need 11.8 g Cl2 for complete reaction and will produce 49.0 g of AlCl3.

B

149) Consider the following reaction: 2 Mg + O2 → 2 MgO △H rxn = -1203 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 4 moles of Mg. A) -1203 kJ B) -2406 kJ C) -601.5 kJ D) -4812 kJ E) none of the above

B

15) Determine the answer for the equation below with correct number of significant figures: 3.215 × 13.2 ÷ 0.218 = ________ A) 194.669 B) 195 C) 194.7 D) 194.67 E) none of the above

B

21) How many liters are in 333 mL? A) 3.33 × 105 B) 0.333 C) 33.3 D) 3.33 E) none of the above

B

22) How many low dose 81 mg aspirin tablets can be made from 1.21 kg of aspirin? A) 1.5 × tablets B) 1.5 × tablets C) 1.5 × tablets D) 1.21 × tablets E) 1.21 × tablets

B

29) What is the density (g/mL) of an object that has a mass of 14.01 grams and, when placed into a graduated cylinder, causes the water level to rise from 25.2 mL to 33.6 mL? A) 0.60 B) 1.7 C) 1.8 D) 2.4 E) none of the above

B

30) Which state of matter has atomic spacing that is close together and definite shape? A) liquid B) solid C) gas D) plasma E) none of the above

B

33) A pure substance is: A) composed of two or more different types of atoms or molecules combined in variable proportions. B) composed of only one type of atom or molecule. C) composed of two or more regions with different compositions. D) composed of two or more different types of atoms or molecules that has constant composition. E) none of the above

B

37) What is the molarity of a solution prepared by dissolving of 54.3g CaNO3 into 355mL of water? A) 0.331 M B) 0.932 M C) 0.117 M D) 1.99 M E) none of the above

B

37) Which of the following is a homogeneous mixture? A) trail mix B) stainless steel C) water D) molten iron E) none of the above

B

42) A 0.15 M solution of BaCl2 contains: A) 0.15 M Ba2+ ions and 0.15 M Cl- ions. B) 0.15 M Ba2+ ions and 0.30 M Cl- ions. C) 0.30 M Ba2+ ions and 0.15 M Cl- ions. D) 0.30 M Ba2+ ions and 0.30 M Cl- ions. E) none of the above

B

45) What is the value of 98 °F in units of °C? A) 72 B) 37 C) 371 D) 22 E) none of the above

B

45) Which solution below contains the highest total quantity of dissolved sodium ions? A) 100. mL of 4.0 M NaCl B) 75.0 mL of 3.0 M Na2SO4 C) 50.0 mL of 8.0 M NaOH D) 50.0 mL of 2.0 M Na3PO4 E) none of the above

B

48) A 90.0 g sample of NaOH is dissolved in water and the solution is diluted to give a final volume of 3.00 liters. The molarity of the final solution is ________. A) 0.500 M B) 0.750 M C) 1.00 M D) 2.25 M E) none of the above

B

53) If you add 4.00 mL of pure water to 6.00 mL of 0.750 M NaCl solution, what is the concentration of sodium chloride in the diluted solution? A) 0.250 M B) 0.450 M C) 0.500 M D) 1.13 M E) none of the above

B

54) How much water would you ADD to 175 mL of 6.00 M hydrochloric acid to prepare a 2.00 M solution of this acid? A) 525 mL B) 350 mL C) 58.3 mL D) 700. mL E) none of the above

B

7) Which of the following is considered a hypothesis (as opposed to an observation)? A) Spiders have eight legs. B) Birds can fly because they have hollow bones. C) Fresh lava from a volcano is hot. D) The Washington Monument is 555 feet tall. E) none of the above

B

9) Determine the answer to the following equation with correct number of significant figures: (17.103 + 2.03) × 1.02521 = ________ A) 19.6153 B) 19.62 C) 19.6 D) 20 E) none of the above

B

1) Which statement about the scientific method is TRUE? A) The scientific method emphasizes reason as the way to understand the world. B) The scientific method emphasizes observation and reason as the way to understand the world. C) The scientific method emphasizes observation and experimentation as the way to understand the world. D) The scientific method emphasizes scientific laws as the way to understand the world. E) All of the above statements are false.

C

11) The correct scientific notation for the number 500.0 is: A) 5 × 102 B) 5.00 × 102 C) 5.000 × 102 D) 5 × 10-2 E) none of the above

C

124) What type of reaction is the generic equation A + BC → AC + B? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

C

128) Consider the following generic chemical equation: 2A + 5B → C + 3D If you react 4 units of A with 10 units of B, which statement is TRUE? A) Substance A will be the limiting reactant. B) Substance B will be the limiting reactant. C) There is just enough of A and B so that everything reacts completely. D) Substance C cannot be formed from this reaction. E) none of the above

C

134) If 16.0 grams of aluminum oxide were actually produced, what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 75.0% B) 100% C) 84.7% D) 39.6% E) not enough information

C

150) Consider the following equation: CO + 2 H2 → CH3OH △H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2. A) -1024 kJ B) -1034 kJ C) -256 kJ D) -512 kJ E) none of the above

C

16) Determine the answer for the equation below with correct number of significant figures: 1.2 × 1.79 = ________ A) 2.148 B) 2.15 C) 2.1 D) 2.2 E) none of the above

C

25) What is the volume of a cube with dimensions 11.0 cm × 11.0 cm × 11.0 cm in m3? A) 1.331 × 10-3 B) 1.33 × 103 C) 1.33 × 10-3 D) 1.3 × 103 E) none of the above

C

26) A plastic block has dimensions of 2.2 cm × 3.0 cm × 1.5 cm and a mass of 12.4 grams. Will the block float in water and why? A) Yes, because the density of the block is 1.3 g/mL which is less than the density of water. B) Yes, because the density of the block is 0.80 g/mL which is less than the density of water. C) No, because the density of the block is 1.3 g/mL which is greater than the density of water. D) No, because the density of the block is 0.80 g/mL which is greater than the density of water. E) none of the above

C

27) A lead ball has a mass of 55.0 grams and a density of 11.4 g/cm3. What is the volume of the ball? A) 0.207 mL B) 0.207 L C) 4.82 mL D) 4.82 L E) none of the above

C

29) What is the mass percent of an ammonium carbonate solution prepared by dissolving 33.2g of solid into of 39.5g water? A) 84.1% B) 72.7% C) 45.7% D) 54.3% E) none of the above

C

35) Which of the following items is a mixture? A) water B) helium C) brass D) sugar E) none of the above

C

36) Which of the following is a heterogenous mixture? A) milk B) sugar water C) raisin bran D) air E) none of the above

C

38) Which of the following statements about compounds is TRUE? A) A substance that cannot be broken down into simpler substances. B) A pure substance that has variable composition throughout. C) A substance composed of two or more elements in fixed, definite proportions. D) A substance that is not as common as pure elements. E) none of the above

C

4) What term best describes a brief statement that summarizes many past observations and predicts new ones? A) experiment B) hypothesis C) scientific law D) theory E) none of the above

C

41) Physical properties are: A) those that a substance displays only through changing its composition. B) those that cause atoms and molecules to change. C) those that a substance displays without changing its composition. D) identical for all solid matter. E) none of the above

C

42) All of the following can be considered physical properties EXCEPT: A) taste. B) color. C) flammability. D) density. E) boiling point.

C

43) What are the ion concentrations in a 0.12 M solution of AlCl3? A) 0.36 M Al3+ ions and 0.12 M Cl- ions B) 0.12 M Al3+ ions and 0.040 M Cl- ions C) 0.12 M Al3+ ions and 0.36 M Cl- ions D) 0.040 M Al3+ ions and 0.040 M Cl- ions E) none of the above

C

10) The correct scientific notation for the number 0.00050210 is: A) 5.0210 × 104 B) 5.021 × 10-4 C) 5.021 × 104 D) 5.0210 × 10-4 E) none of the above

D

12) The wavelength of blue light is 0.00000045 m. Express this wavelength in scientific notation. A) 4.5 × 10^7m B) 4.50 × 10-3m C) 4.5 × 10-4m D) 4.5 × 10-7m E) 0.45 × m

D

122) The reaction CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g) is: A) a combustion reaction. B) a redox reaction. C) an exothermic reaction. D) all of the above E) none of the above

D

125) What type of reaction is the generic equation AB + CD -> AD + CB? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

D

127) Suppose two chemical reactions are linked together in a way that the O2 produced in the first reaction goes on to react completely with Mg to form MgO in the second reaction. Reaction one: 2 KClO3 → 3 O2 + 2 KCl Reaction two: 2 Mg + O2 → 2 MgO If you start with 4 moles of KClO3, how many moles of MgO could eventually form? A) 2 moles B) 4 moles C) 6 moles D) 12 moles E) none of the above

D

133) How many grams of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 40.4 B) 5.00 C) 0.185 D) 18.9 E) not enough information

D

140) A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of NH3. What is the percent yield for this reaction? Reaction: N2(g) + 3 H2(g) → 2 NH3(g) A) 86.8% B) 73.6% C) 26.4% D) 13.2% E) none of the above

D

148) The reaction of one mole of nitrogen gas with three moles of hydrogen gas releases 92 kJ of thermal energy to the surroundings. Which of the following is TRUE? A) This reaction is exothermic. B) This reaction has a negative enthalpy of reaction. C) Complete reaction of two moles of nitrogen gas would release 184 kJ of thermal energy in this reaction. D) All of the above are true. E) None of the above are true.

D

16) Which of the following compounds is a strong electrolyte? A) HCL B) NACL C) NH4CL D) NaC2H3O2 E) all of the above

D

17) Determine the answer to the following equation with correct number of significant figures: 106 ÷ 9.02 × 1.9 = ________ A) 22.32816 B) 22.328 C) 22.3 D) 22 E) none of the above

D

34) You need to prepare 2.00 L of 0.100 M Na2CO3 solution. The best procedure is to weigh out: A) 10.6 g Na2CO3 and add 2.00 L of water to it. B) 21.2 g Na2CO3 and add 2.00 L of water to it. C) 10.6 g Na2CO3 and add water until the final solution has a volume of 2.00 L. D) 21.2 g Na2CO3 and add water until the final solution has a volume of 2.00 L.

D

36) How many moles of KOH are contained in 750. mL of 5.00 M KOH solution? A) 6.67 mol B) 3.75 × mol C) 56.1 mol D) 3.75 mol E) none of the above

D

40) How would you classify salt water? A) pure substance-compound B) mixture-heterogeneous C) pure substance-element D) mixture-homogeneous E) none of the above

D

43) Which of the following items is a chemical property? A) the paint color on a new red Corvette B) the odor of spearmint gum C) the melting and boiling point of water D) the tarnishing of a copper statue E) none of the above

D

44) Which one of the following aqueous solutions would have the higher concentration of K+ (aq) ions? (Assume total solubility in water.) A) 1.0 M KC2H3O2 B) 1.0 M KNO3 C) 1.0 M K2CO3 D) 1.0 M K3PO4 E) All of these solutions have the same concentration of K+ (aq).

D

49) What is the final concentration of a solution prepared by diluting 35.0mL of 12.0mL HCl to a final volume of 1.20L? A) 0.504 M B) 3.50 M C) 0.420 M D) 0.350 M E) none of the above

D

5) Which statement accurately describes the purpose of experiments? A) Experiments are designed to produce the results predicted by a theory. B) Experiments can be replaced by a simple, logical reasoning of known facts. C) Experiments are designed to produce unexplainable results for further investigation. D) Experiments look for other observable predictions of a theory. E) none of the above

D

56) How many total atoms are in the formula Al2(CO3)3? A) 8 B) 9 C) 12 D) 14 E) none of the above

D

6) Which of the following would be considered a theory? A) Glass is fragile. B) Hot air rises. C) Gasoline has a very strong odor. D) Helium balloons float because helium is less dense than air.

D

8) Determine the answer to the following equation with correct number of significant figures: (4.123 × 0.12) + 24.2 = ________ A) 25 B) 24.695 C) 24.70 D) 24.7 E) none of the above

D

15) Which of the following compounds is a strong electrolyte? A) HCl B) NaCl C) NCl D) Na E) all of the above

E

2) Which of the statements below is NOT part of the scientific method? A) observation and measurement B) formation of a hypothesis C) testing of a hypothesis by experimentation D) refinement of a hypothesis as needed E) All of the above steps are part of the scientific method.

E

31) Which among the following statements is FALSE? A) A solid has a definite shape and a definite volume. B) A liquid has a definite volume; but it has no definite shape. C) A gas has neither definite volume nor definite shape. D) Both solids and liquids are incompressible while gases are compressible. E) none of the above

E

32) Which state of matter has atomic spacing that is far apart and definite shape? A) liquid B) solid C) gas D) plasma E) none of the above

E

39) Which of the following statements is FALSE? A) Matter may be a pure substance or it may be a mixture. B) A pure substance may either be an element or a compound. C) A mixture may be either homogeneous or heterogeneous. D) Mixtures may be composed of two or more elements, two or more compounds, or a combination of both. E) All of the above statements are true.

E

44) Which of the following statements about physical and chemical changes is FALSE? A) In a chemical change, matter changes its composition. B) In a physical change, matter does not change its composition. C) Phase changes are always physical changes. D) Chemical reactions are chemical changes. E) All of the above statements are true.

E

104) What are the coefficients for the following reaction when it is properly balanced? ___HCl + ___Mg → ___MgCl2 + ___H2 A) 2, 1, 1, 1 B) 2, 1, 2, 2 C) 1, 2, 1/2, 1 D) 1, 1, 1, 2 E) none of the above

a

116) What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide? A) H+ + Cl- + K+ + OH- → H2O + K+ + Cl- B) H+ + Cl- + K+ + OH- → 2H+ + O2- + K+ + Cl- C) H+ + OH- → H2O D) 2H+ +2Cl- + K2+ + 2OH- → H2O + K2+ +2 Cl- E) none of the above

a

120) A redox reaction has occurred ________. A) when a substance reacts with elemental oxygen B) when an alkali metal reacts with an alkaline earth metal C) when one substance transfers protons to another D) when one substance forms a solid E) when all of the above occur

a

123) What type of reaction is the generic equation ? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

a

57) How many carbon atoms are in the formula Al2(CO3)3? A) 3 B) 9 C) 1 D) 6 E) none of the above

a

58) Which formula shown is incorrect for the name given? A) magnesium nitrite: Mg(NO2)3 B) calcium carbonate: CaCO3 C) aluminum sulfate: Al2(SO4)3 D) sodium hydrogen carbonate: NaHCO3 E) potassium hydroxide: KOH

a

64) The charge of a vanadium ion in the compound V2O5 is: A) 5+ B) 2+ C) 10+ D) 10- E) none of the above

a

69) What is correct name of the compound whose formula is BF3? A) boron trifluoride B) boron fluoride C) monoboron trifluorine D) boron(III) fluoride E) none of the above

a

78) How many moles of bromine gas are in 37.7 grams? A) 0.236 B) 0.472 C) 3.01 × 103 D) 79.9 E) none of the above

a

83) How many molecules of sulfur trioxide are in 78.0 grams? A) 5.87 × 1023 B) 7.33 × 1023 C) 3.76 × 1027 D) 0.974 E) none of the above

a

85) If 3.011 × 10 ^23 molecules have a mass of 20.04 grams, what is the molar mass of this substance? A) 40.08 g/mol B) 10.02 g/mol C) 20.04 g/mol D) 6.658 × g/mol E) none of the above

a

87) If a sample of carbon dioxide contains 3.8 moles of oxygen atoms, how many moles of carbon dioxide are in the sample? A) 1.9 B) 3.8 C) 7.6 D) 11.4 E) none of the above

a

90) An iron ore sample is found to be 35.00% Fe by mass. How many grams of ore are needed to obtain of Fe? A) 1297 B) 158.9 C) 295.1 D) 350.0 E) none of the above

a

108) What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate → ___lead (II) iodide +___potassium acetate A) 2, 1, 1, 1 B) 2, 1, 1, 2 C) 3, 2, 2, 1 D) 1, 1, 2, 2 E) none of the above

b

109) What are the coefficients for the following reaction when it is properly balanced? ___nitrogen monoxide + ___carbon monoxide → ___nitrogen +___carbon dioxide A) 2, 1, 1, 2 B) 2, 2, 1, 2 C) 2, 2, 2, 1 D) 1, 1, 2, 2 E) none of the above

b

112) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be present in the net ionic equation? A) Pb2+, NO3- B) K+, NO3- C) K+, Pb2+ D) K+, I- E) All the above ions are in the net ionic equation.

b

126) What type of reaction is the generic equation AB -> A + B A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

b

144) What is the molecular formula of a compound given the molar mass of the compound is 30.04 gram and the empirical formula is NH? A) NH B) N2H2 C) N2H6 D) N4H4 E) none of the above

b

74) How many moles of Cu are in 1.48 × 1025 Cu atoms? A) 0.0408 B) 24.6 C) 1.54 × 1025 D) 6.022 × 1023 E) none of the above

b

75) What is the mass in grams of 5.40 moles of lithium? A) 6.94 B) 37.5 C) 1.29 D) 3.25 × 1024 E) none of the above

b

77) You have 10.0 g each of Na, C, Pb, Cu and Ne. Which contains the largest number of moles? A) Na B) C C) Pb D) Cu E) Ne

b

79) How many atoms are in 15.6 grams of silicon? A) 2.64 × 1026 B) 3.34 × 1023 C) 0.555 D) 438 E) none of the above

b

80) How many hydrogen atoms are in 35.0 grams of hydrogen gas? A) 4.25 × 1025 B) 2.09 × 1025 C) 2.12 × 1025 D) 1.05 × 1025 E) none of the above

b

81) Which of the following contains 9.02 × 1023 atoms? A) 4.00 g H2 B) 9.00 g H2O C) 28.0 g N2 D) 32.0 g O2 E) none of the above

b

86) If 2.01 × 10^23 atoms of an element from Group IA of the periodic table has a mass of 7.675 grams, this element is most likely: A) Li. B) Na. C) K. D) Rb. E) Cs.

b

89) A 42.7 gram sample of potassium nitrate contains how many grams of potassium? A) 39.1 B) 16.5 C) 21.4 D) 8.54 E) none of the above

b

91) A 500. gram iron ore sample was determined to contain 242 grams of iron. What is the mass percent of iron in the ore? A) 93.7 B) 48.4 C) 51.6 D) 32.6 E) none of the above

b

94) Which of the following compounds has the highest mass percent of "O"? A) MnO B) MnO2 C) Mn2O3 D) Mn3O2 E) none of the above

b

99) Determine the correct empirical formula of a compound containing 26.68% carbon, 2.24% hydrogen, and 71.08% oxygen. A) CHO B) CHO2 C) C0.5H0.5O1 D) C2H2O4 E) none of the above

b

100) A compound composed of only carbon and hydrogen is 25.2% hydrogen by mass. The empirical formula for this compound is: A) CH0.25 B) C3H C) CH4 D) C2H8 E) none of the above

c

102) An estrogen compound with the empirical formula C12H17O2 has a molecular mass of 386.6 g/mol. What is the value of n necessary to find the molecular formula? A) 0.2 B) 1 C) 2 D) 20 E) none of the above

c

106) What are the coefficients for the following reaction when it is properly balanced? ___Na3PO4 + ___Ba(NO3)2 → ___NaNO3 + ___Ba3(PO4)2 A) 2, 1, 1, 3 B) 2, 3, 1, 6 C) 2, 3, 6, 1 D) 6, 1, 3, 2 E) none of the above

c

110) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct complete ionic equation? A) Pb2+ + (NO3)2- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- B) Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + NO3- C) Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- D) Pb2+ + 2NO3- + 2K+ + 2I- → Pb2+ + 2I- + 2K+ + 2NO3- E) none of the above

c

114) What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide? A) H+ + Cl- + K+ + OH- → H2O + K+ + Cl- B) HCl + KOH → H2O + KCl C) H+ + OH- → H2O D) 2H+ +2Cl- + K2+ + 2OH- → H2O + K2+ +2 Cl- E) none of the above

c

121) Which of the following statements about redox reactions is FALSE? A) Oxidation is the loss of electrons. B) Reduction is the gain of electrons. C) A reaction can result in either oxidation or reduction, not both. D) A reaction involving elemental oxygen is a redox reaction. E) All of the above statement are true.

c

124) What type of reaction is the generic equation A + BC → AC + B? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above 10a

c

146) An unknown acid has a molar mass of 60.06 g/mol. Given the following percent composition, what is the molecular formula? . A) C3H4O3 B) CH2O C) C2H4O2 D) C6H12O6 E) none of the above

c

62) What is the correct formula for ammonium sulfate? A) NH4HSO4 B) (NH4)2HSO4 C) (NH4)2SO4 D) Am2HSO4 E) none of the above

c

63) The formula for potassium chlorate is KClO3. The formula for magnesium chloride is MgCl2. What is the formula for magnesium chlorate? A) MgClO3 B) Mg2ClO3 C) Mg(ClO3)2 D) Mg2(ClO3)3 E) none of the above

c

67) What is the name of the molecular compound SO3? A) sulfur oxide B) sulfur(IV) oxide C) sulfur trioxide D) sulfur tetraoxide E) none of the above

c

84) How many molecules of nitrogen monoxide are in a 22.5 gram sample? A) 5.86 × 1023 B) 7.33 × 1023 C) 4.51 × 1023 D) 4.06 × 1023 E) none of the above

c

88) A 15.5 gram sample of diphosphorous pentoxide contains how many grams of phosphorous? A) 3.38 B) 1.69 C) 6.76 D) 13.5 E) none of the above

c

92) What is the mass percent of chlorine in hydrochloric acid? A) 2.8 B) 35.5 C) 97.2 D) 70.1 E) none of the above

c

93) What is the mass percent of carbon in oxalic acid, H2C2O4? A) 2.24 B) 13.3 C) 26.7 D) 34.5 E) none of the above

c

97) A 7.96 gram sample of silver reacts with oxygen to form 8.55 gram of the metal oxide. What is the formula of the oxide? A) AgO B) AgO2 C) Ag2O D) Ag3O E) none of the above

c

103) When the equation, ___O2 + ___C5H12 → ___CO2 + ___H2O is balanced, the coefficient: of O2 is: A) 3 B) 4 C) 5 D) 8 E) none of the above

d

105) What are the coefficients for the following reaction when it is properly balanced? ___O2 + ___CH4 → ___CO2 + ___H2O A) 2, 1, 3, 1 B) 2, 3, 2, 2 C) 1, 3, 2, 1 D) 2, 1, 1, 2 E) none of the above

d

107) What are the coefficients for the following reaction when it is properly balanced? ___nitric acid + ___sodium hydroxide → ___sodium nitrate + ___water A) 2, 1, 1, 1 B) 2, 3, 2, 2 C) 5, 2, 2, 1 D) 1, 1, 1, 1 E) none of the above

d

111) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct net ionic equation? A) Pb2+ + I2- → PbI2(s) B) 2NO3- + 2K+ → 2KNO3 C) Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- D) Pb2+ + 2I- → PbI2(s) E) none of the above

d

113) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be spectator ions? A) Pb2+, NO3- B) K+, I- C) NO3-, Pb2+ D) Pb2+, I - E) All the above ions are in the net ionic equation.

d

115) What is the molecular equation for the reaction of hydrochloric acid with potassium hydroxide? A) H2Cl + 2KOH → H2O +2KCl B) 2HCl + K(OH)2 → 2H2O + KCl2 C) H+ + OH- → H2O D) HCl + KOH → H2O + KCl E) none of the above

d

117) When a solution of MgCl2 and one of AgNO3 are mixed, the net ionic equation is: A) Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg2+(aq) + 2NO3-aq) + 2AgCl(s) B) Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg(NO3)2 (aq) + 2 AgCl(s) C) Mg2+(aq) + 2NO3-(aq) → Mg(NO3)2(aq) D) Cl-(aq) + Ag+(aq) → AgCl(s) E) none of the above

d

119) What is the gas produced when hydrochloric acid is reacted with ammonium carbonate? A) ammonia B) chlorine C) hydrogen D) carbon dioxide E) none of the above

d

122) The reaction CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g) is: A) a combustion reaction. B) a redox reaction. C) an exothermic reaction. D) all of the above E) none of the above

d

125) What type of reaction is the generic equation AB + CD --> AD + CB A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

d

145) A compound has a molar mass of 180.18 g/mol. Given the following percent composition, calculate the molecular formula: 39.99% C, 6.73% H, 53.28% O. A) CH3O2 B) CH2O C) C3H6O3 D) C6H12O6 E) none of the above

d

60) What is the name of the compound whose formula is Na2O? A) sodium monoxide B) disodium oxide C) disodium monoxide D) sodium oxide E) none of the above

d

61) What is the correct formula for potassium dichromate? A) K(CrO4)2 B) KCr2O7 C) K2CrO4 D) K2Cr2O7 E) none of the above

d

66) What is the name of the molecular compound SF5? A) sulfur hexafluoride B) sulfur heptafluoride C) monosulfur tetrafluoride D) sulfur pentafluoride E) none of the above

d

68) What is correct name of the compound whose formula is N2O4? A) nitrogen dioxide B) nitrogen tetroxide C) dinitrogen oxide D) dinitrogen tetroxide E) none of the above

d

70) What is the formula mass for potassium nitrate? A) 92.99 amu B) 117.11 amu C) 85.11 amu D) 101.10 amu E) none of the above

d

71) What is the formula mass for diboron tetrachloride? A) 127.98 amu B) 198.89 amu C) 234.34 amu D) 163.43 amu E) none of the above

d

72) How many atoms are in 5.80 moles of He? A) 6.02 × 1023 B) 1.03 × 1023 C) 4.00 D) 3.49 × 1024 E) none of the above

d

73) How many atoms are in 1.50 moles of fluorine gas? A) 6.022 × 1023 B) 9.03 × 1023 C) 18.98 D) 1.81 × 1024 E) none of the above

d

76) What is the mass of 0.560 moles of chlorine gas? A) 19.9 B) 63.3 C) 127 D) 39.7 E) none of the above

d

82) The mass of one mole of carbon dioxide is ________ g. A) 28.01 B) 384.4 C) 32.00 D) 44.01 E) none of the above

d

95) A chromium oxide compound contains 104.0 grams of chromium and 48.0 grams of oxygen. What is the most likely empirical formula of this compound? A) CrO B) CrO2 C) CrO3 D) Cr2O3 E) Cr3O2

d

96) An iron chloride compound contains 55.85 grams of iron and 106.5 grams of chlorine. What is the most likely empirical formula for this compound? A) FeCl B) FeCl2 C) Fe2Cl D) FeCl3 E) Fe3Cl

d

98) Vitamin C is known chemically by the name ascorbic acid. Determine the empirical formula of ascorbic acid if it is composed of 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen. A) CHO B) CH2O C) C2H3O2 D) C3H4O3 E) none of the above

d

101) What is the molecular formula of a compound given the molar mass of the compound is and the empirical formula is C2H7? A) C4H14 B) C3H21 C) C2H7 D) C2H14 E) none of the above

e

118) Which of the following types of compounds will NOT undergo a gas evolution reaction when acid is added? A) sulfides B) carbonates C) hydroxides D) bisulfites E) none of the above

e

143) What would the empirical formula be for the molecular compound C6H9O4? A) C2H3O2 B) CH3O2 C) C3H6O2 D) C3H9O4 E) none of the above

e

59) Which formula shown is incorrect for the name given? A) strontium carbonate: SrCO3 B) ammonium cyanide: NH4CN C) potassium acetate: KC2H3O2 D) calcium nitrate: Ca(NO3)2 E) lithium sulfate: LiSO4

e

65) Choose the pair of names and formulas that do NOT match. A) copper(I) nitrate: CuNO3 B) copper(II) nitride: Cu3N2 C) copper(II) nitrate: Cu(NO3)2 D) copper(II) nitrite: Cu(NO2)2 E) all of these are correct

e