Chem 104 Final Review

The unit of 1 atmosphere used to describe the pressure of a gas is equal to A) 1 mmHg. B) 760 mmHg. C) 100 mmHg. D) 600 mmHg. E) 200 mmHg.

B) 760 mmHg.

Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq) When 25.0 g of Zn reacts, how many L of H2 gas are formed at 25 °C and a pressure of 854 mmHg? A) 0.120 L B) 8.32 L C) 8.56 L D) 22.4 L E) 0.382 L

B) 8.32 L

Each symbol denotes an element except A) Co. B) CO. C) Cu. D) Cl. E) C.

B) CO.

Which elements all belong in the same group? A) C, N, O B) F, Cl, Br C) B, Si, As D) Fe, Cu, Ni E) Al, Ge, Sb

B) F, Cl, Br

Which one of the following compounds contains an ion with a 3+ charge? A) MgCl2 B) FeCl3 C) KCl D) Na2O E) CuCl

B) FeCl3

What is the mass of a sample of O2 gas, which has a pressure of 740. mmHg, at a temperature of 25 °C, in a volume of 250. mL? A) 292 g B) 0.318 g C) 320. g D) 3.82 g E) 201 g

B) 0.318 g

How many molecules are present in 1.75 moles of carbon dioxide, CO2 ? A) 1.725moles B) 1.05 × 1024 C) 3.44 × 1024 D) 3.44 × 1023 E) 1.05 × 1023

B) 1.05 × 1024

A salt shaker contains 73.7 g of NaCl. How many moles of NaCl are present? Molar mass of NaCl: 58.44 g/mole A) 1.0 mole. B) 1.26 moles. C) 4307 moles. D) 0.790 moles. E) 6.0 moles.

B) 1.26 moles.

An imaginary element Xz consists of two isotopes having masses of 100.0 amu and 102.0 amu. A sample of Xz was found to contain 75.0% of the 100Xz isotope and 25.0% of the 102Xz. Calculate the atomic weight of Xz. A) 101.0 amu B) 100.5 amu C) 100.3 amu D) 101.8 amu E) 101.5 amu

B) 100.5 amu

A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 330 mmHg and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the mixture in mmHg? A) 430 mmHg B) 1100 mmHg C) 1.4 mmHg D) 760 mmHg E) 330 mmHg

B) 1100 mmHg

3.25 kcal is the same amount of energy as A) 777 J. B) 13600 J. C) 0.777 J. D) 3.25 J. E) 13.6 J.

B) 13600 J.

What is the electron configuration of S? A) 1s2 2s2 2p2 B) 1s2 2s2 2p6 3s2 3p4 C) 1s2 2s2 2p6 3s2 3p6 D) 1s2 2s2 2p6 3s2 3p2 E) 1s2 2s2 2p6 3s2 3p6 4s2 3d1

B) 1s2 2s2 2p6 3s2 3p4

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 reacted to the number of moles of Fe2O3 produced? 4Fe(s) + 3O2 (g) → 2Fe2O3(s) A) 3 moles of O2 / 2 moles of Fe2O3 B) 2 moles of Fe2O3 / 3 moles of O2 C) 4 moles of Fe / 3 moles of O2 D) 2 moles of Fe2O3 / 4 moles of Fe E) 4 moles of Fe 2 / moles of Fe2O3

B) 2 moles of Fe2O3 / 3 moles of O2

Which of the following gives the balanced equation for this reaction? K3PO4(aq) + Ca(NO3) 2(aq) → Ca3(PO4) 2 (s)+ KNO3(aq) A) 2K3PO4 + Ca(NO3) 2 → Ca3(PO4) 2(s) + 6KNO3 B) 2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2(s) + 6KNO3 C) K3PO4 + Ca(NO3) 2 → Ca3(PO4) 2(s) + KNO3 D) K3PO4 + Ca(NO3)2 → Ca3(PO4)2(s) + 3KNO3 E) KPO4 + CaNO3 + KNO3

B) 2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2(s) + 6KNO3

Which of the following numbers contains five significant figures? A) 0.4910 B) 4.9100 C) 0.04910 D) 4,910,000 E) 49,100

B) 4.9100

A doctor's order is 0.25 g of ampicillin. The liquid suspension on hand contains 250 mg/5.0 mL. How many milliliters of the suspension are required? A) 6.3 mL B) 5.0 mL C) 2.5 mL D) 0.0025 mL E) 0.0063 mL

B) 5.0 mL

Know the Lewis Dot Structure for OCl2 & CH2Cl2 & Sulfur (S)

**

What is the numerical value of 1.2 × 1.222? Express your answer using the correct number of significant figures. A) 1.5 B) 1.466 C) 1.47 D) 1.4664 E) none of the above

A) 1.5

How many electrons can occupy the 3d subshell? A) 10 B) 2 C) 8 D) 6 E) 1

A) 10

A bottle contains 240 mL of cough syrup. If one teaspoon (5 mL) is given four times a day, how many days will elapse before a refill is needed? A) 12 days B) 24 days C) 20 days D) 6 days E) 3 days

A) 12 days

In the reaction of nitrogen gas, N2, with hydrogen gas, H2, to form ammonia gas, NH3 , how many moles of hydrogen are needed to react with four moles of nitrogen? A) 12 moles B) 6 moles C) 10 moles D) 4 moles E) 8 moles

A) 12 moles

A gas contained in a steel tank has a pressure of 1.5 atm at a temperature of 320 K. What will be the gas pressure when the temperature changes to 450 K, at constant amount of gas and volume? A) 2.1 atm B) 1.5 atm C) 0.94 atm D) 0.47 atm E) 1.1 atm

A) 2.1 atm

At STP, temperature and pressure have the values of A) 273 K and 760 mmHg. B) 0 K and 760 mmHg. C) 273 K and 1 mmHg. D) 0 K and 1 atm. E) 760 K and 273 atm.

A) 273 K and 760 mmHg

What is the mass of 73 mL of ethanol, which has a density of 0.79 g/mL? A) 58 g B) 67.1 g C) 41.9 g D) 42 g E) 67 g

A) 58 g

The molar mass of C3H8O2 is A) 76.0 g. B) 29.0 g. C) 52.0 g. D) 60.0 g. E) 69.0 g

A) 76.0 g.

What is 0.0970 written in scientific notation? A) 9.70 × 10-2 B) 0.97 × 10-1 C) 970 × 10-4 D) 97.0 × 10-2 E) 97 × 10-3

A) 9.70 × 10-2

When 3.05 moles of CH4 are mixed with 10.03 moles of O2 the limiting reactant is CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) A) CH4. B) O2. C) H2O. D) CO2.

A) CH4.

Which of the following substances contains a nonpolar covalent bond? A) N2 B) NaCl C) NH3 D) H2O E) MgF2

A) N2

Which of the following is a mixture? A) cough syrup B) oxygen C) iron D) sodium chloride E) helium

A) cough syrup

When a nucleus emits a positron, the atomic number of the new nucleus A) decreases by 1 B) increases by 2 C) increases by 1 D) decreases by 2 E) does not change

A) decreases by 1

How many electrons will aluminum gain or lose when it forms an ion? A) lose 3 B) lose 1 C) lose 2 D) gain 1 E) gain 5

A) lose 3

A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740 mmHg and a temperature of 25 °C. What was the new volume of the gas when the temperature was changed to 50.°C and the new pressure was 760 mmHg, if the amount of gas does not change? A) 970 mL B) 530 mL C) 450 mL D) 400 mL E) 240 mL

B) 530 mL

How many grams of glucose (C6H12O6) are in 3.55 moles of glucose? Molar mass of glucose: 180.16 g/mole A) 180. g B) 639 g C) 103 g D) 50.7 g E) 426 g

B) 639 g

At STP, how many moles of helium gas would occupy 1.00 L? A) 224 moles B) 2.24 moles C) 0.446 moles D) 22.4 moles E) 0.0446 moles

E) 0.0446 moles

How many moles of water contain 2.60 × 1023 molecules of water? A) 2.61 × 103 moles B) 0.119 moles C) 15.6 moles D) 2.31 moles E) 0.432 moles

E) 0.432 moles

Which of the following correctly gives the correct coefficients for the reaction below? N2H4(g) + H2O2(l) → N2(g) + H2O(g) A) 1, 4, 1, 4 B) 1, 1, 1 ,1 C) 2, 4, 2, 8 D) 2, 4, 2, 4 E) 1, 2, 1, 4

E) 1, 2, 1, 4

For the reaction: 2H2O(l) + 137 kcal → 2H2 (g) + O2 (g), how many kcal are needed to form 2.00 moles O2(g)? A) 190. kcal B) 68.5 kcal C) 137 kcal D) 548 kcal E) 274 kcal

E) 274 kcal

How many electrons can occupy the shell having n = 4? A) 18 B) 8 C) 10 D) 2 E) 32

E) 32

Consider the isotope 79 35 Br. The atomic number is ________, and the mass number is ________. A) 35; 44 B) 79; 35 C) 44; 35 D) 35; 114 E) 35; 79

E) 35; 79

How many electrons are there in the valence shell of a nitrogen atom? A) 7 B) 3 C) 0 D) 2 E) 5

E) 5

The volume of a sample of gas, initially at 25 °C and 158 mL, increases to 450. mL. What is the final temperature of the sample of gas, if the pressure and amount of gas in the container is kept constant? A) -168 °C B) 105 °C C) 71 °C D) 8.8 °C E) 576 °C

E) 576 °C

How many grams of H2O are needed to produce 150 g of Mg(OH)2? Molar mass of H2O : 18.01 g/mole; molar mass of Mg(OH)2 : 58.32 g/mole Mg3N2(s) + 6H2O(l) → 3Mg (OH)2(s) + 2NH3(g) A) 46 g B) 23 g C) 130 g D) 18 g E) 93 g

E) 93 g

Which of the following molecules is nonpolar? A) HBr B) NH3 C) CHF3 D) NF3 E) CH3CH3

E) CH3CH3

What is the correct formula for the oxide ion? A) O3+ B) O- C) O2+ D) O+ E) O2-

E) O2-

The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction. 2H2O(l) → 2H2(g) + O2(g) A) combustion B) single replacement C) combination D) double replacement E) decomposition

E) decomposition

What unit of temperature is used in gas law calculations? A) degree Celsius B) either kelvin or degree Celsius C) either degree Celsius or degree Fahrenheit D) degree Fahrenheit E) kelvin

E) kelvin

The metric unit used to measure volume is the A) Kelvin. B) gram. C) meter. D) gram per cubic centimeter. E) liter.

E) liter.

Which of the following is the smallest unit? A) decigram B) gram C) milligram D) kilogram E) microgram

E) microgram

Hydrogen exists as three isotopes. These isotopes differ by the number of ________ contained in the atom. A) electrons B) charges C) particles D) protons E) neutrons

E) neutrons

Avogadro's number is the number of A) moles in 6.02 × 1023 amu of an element. B) amu in 1 mole of a substance. C) moles in 6.02 × 1023 grams of an element. D) grams in 1 mole of a substance. E) particles in 1 mole of a substance.

E) particles in 1 mole of a substance.

The shape of the carbon tetrachloride molecule is A) octagonal. B) linear. C) trigonal pyramidal. D) square. E) tetrahedral.

E) tetrahedral.

The volume of a gas with a pressure of 1.2 atm increases from 1.0 L to 4.0 L. What is the final pressure of the gas, assuming no change in amount of gas or temperature? A) 3.3 atm B) 4.8 atm C) 1.0 atm D) 0.30 atm E) 1.2 atm

D) 0.30 atm

How many moles of hydrogen are there in 0.500 mole of C2H6? A) 0.500 moles B) 1.00 moles C) 6.02 × 1023 moles D) 3.00 moles E) 4.00 moles

D) 3.00 moles

The correctly written symbol for an isotope of sulfur is A) 30 / 16 Zn B) 14 / 30 Si C) 16 / 30 S D) 30 / 16 S E) 30 / 16 Si

D) 30 / 16 S

On a hot day, the thermometer read 95 °F. What is the temperature in degrees Celsius? A) 113 °C B) 178 °C C) 63 °C D) 35 °C E) 77 °C

D) 35 °C

When 60.0 g of CH4 reacts with excess O2, the actual yield of CO2 is 112 g. What is the percent yield? Molar mass of CH4: 16.04 g/mole; molar mass of CO2: 44.01 g/mole CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) A) 46.4 % B) 53.6 % C) 187 % D) 67.9 %

D) 67.9 %

Which of the following measurements are NOT equivalent? A) 195 L = 0.195 kL B) 27 dL = 2.7 L C) 0.025 g = 25 mg D) 9.2 mm = 92 cm E) 1 mL = 1 cc

D) 9.2 mm = 92 cm

What is oxidized and what is reduced, respectively, in the following reaction? 2Al(s) + 3Br2(g) → 2AlBr3(s) A) AlBr3 is reduced and Al is oxidized. B) AlBr3 is reduced and Br2 is oxidized. C) Al is reduced and Br2 is oxidized. D) Al is oxidized and Br2 is reduced. E) AlBr3 is oxidized and Al is reduced.

D) Al is oxidized and Br2 is reduced.

Of the elements: Li, C, F, and O, the element with the smallest atomic radius is A) C B) O C) Li D) F

D) F

Which of the following compounds contains a polar covalent bond? A) MgO B) NaF C) Br2 D) HCl E) O2

D) HCl

What is the symbol for the ion with 19 protons and 18 electrons? A) Ar+ B) F- C) F+ D) K+ E) K

D) K+

Of the elements: Li, C, F, and O, the element with the lowest ionization energy is A) C B) F C) O D) Li

D) Li

What is abbreviated electron configuration (noble gas notation) for calcium? A) 1s2 2s2 2p6 3s2 3p6 4s3 B) 1s2 2s2 2p6 3s2 3p6 4s2 C) [Ne]3s2 3p6 4s2 D) [Ar]4s2

D) [Ar]4s2

An ionic bond typically occurs between A) two different nonmetals B) two of the same type of nonmetals C) two different metals D) a metal and a nonmetal E) two noble gases

D) a metal and a nonmetal

What is missing in the nuclear reaction shown below? 10 / 5 B + 4 / 2 He → 13 / 7 N + ________ A) an alpha particle B) gamma radiation C) a positron D) a neutron E) a beta particle

D) a neutron

Carbon dioxide is a(n) A) homogeneous mixture. B) heterogeneous mixture. C) element. D) compound

D) compound

What is the major type of intermolecular force in the molecule of hydrogen chloride? A) ionic bonds. B) covalent bonds. C) hydrogen bonds. D) dipole-dipole attractions. E) dispersion forces

D) dipole-dipole attractions.

Which of the following causes a chemical change? A) pumping gasoline B) winding an alarm clock C) slicing a tomato D) metabolizing fat E) digging a hole

D) metabolizing fat

The "splitting" of a large nucleus to form smaller particles accompanied by a release of energy in called A) half-life B) nuclear fusion C) radioisotope D) nuclear fission

D) nuclear fission

What is the classification for this balanced reaction? 2Fe(s) + 6HCl (aq) → 2FeCl3 (aq)+ 3H2(g) A) combination B) decomposition C) double replacement D) single replacement E) combustion

D) single replacement

The octet rule indicates that A) all of the Group A elements have eight valence electrons. B) atoms lose, gain, or share valence electrons to have eight valence electrons. C) the noble gases react with other compounds to get eight valence electrons. D) all of the shells in an atom hold a maximum of eight electrons. E) all of the noble gases have eight total electrons.

B) atoms lose, gain, or share valence electrons to have eight valence electrons.

The symbol 0 -1 e is a symbol used for a(n) A) gamma ray. B) beta particle. C) alpha particle. D) neutron. E) proton.

B) beta particle.

The correct name for the compound N2O3 is A) dinitride trioxide. B) dinitrogen trioxide. C) nitrogen oxide. D) dinitrogen oxide. E) nitrogen trioxide.

B) dinitrogen trioxide.

Alpha particles are composed of A) protons B) protons and neutrons C) electrons D) protons and electrons E) electrons

B) protons and neutrons

The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min? A) 1.0 mg B) 0.25 mg C) 0.50 mg D) 4.0 mg E) 2.0 mg

C) 0.50 mg

Some cooking pans have a layer of copper on the bottom. How many kilojoules are needed to raise the temperature of 125 g of copper from 22 °C to 325 °C? The sepeific heat of copper is 0.0920 cal/g °C. A) 0.0379 kJ B) 3485 kJ C) 14.6 kJ D) 125 kJ E) 3.485 kJ

C) 14.6 kJ

What temperature is -10.°C on the Fahrenheit scale? A) -18°F B) 26°F C) 14°F D) 263°F E) -6.0°F

C) 14°F

At STP, what is the mass of 11.2 liters of O2 gas? molar mass of O2 : 32.00 g/mole A) 32.0 g B) 128 g C) 16.0 g D) 8.00 g E) 64.0 g

C) 16.0 g

Elements in group 2A (2) of the periodic table form ions with a charge of A) 3+. B) 1-. C) 2+. D) 1+. E) 0.

C) 2+.

In a sauna, 132 g of water is converted to steam at 100 °C. How many kilojoules of heat are needed? The heat of vaporization of water is 540 cal/g. A) 276 kJ B) 71280 kJ C) 298 kJ D) 71.3 kJ

C) 298 kJ

A serving of fish contains 61 g of protein and 7.0 g of fat. If protein has a caloric value of 4.0 kcal/g and fat has 9.0 kcal/g, how many kcal are in the serving? A) 54.0 kcal B) 220 kcal C) 310 kcal D) 490 kcal E) 470 kcal

C) 310 kcal

What is missing in the nuclear reaction shown below? 66 / 30 Zn + 1 1 H → ________ A) 66 / 31 Ga B) a proton C) 67 / 31 Ga D) 65 / 29 Cu E) 67 / 31 Zn

C) 67 / 31 Ga

When silicon dioxide (sand ) and carbon are heated, the products are silicon carbide, SiC, and carbon monoxide. Silicon carbide is a ceramic material that tolerates extreme temperatures and is used as an abrasive and in the brake discs of cars. How many grams of CO are formed from 80. g of SiO2 and 60.0 g of C? Molar mass of SiO2: 60.09 g/mole; molar mass of CO: 28.01 g/mole SiO2(s) + 3C(s) → SiC(s) + 2CO(g) A) 665.3 g B) 77.7 g C) 74.6 g D) 93.3 g E) 168 g

C) 74.6 g

What is the formula for aluminum nitrate? A) Al2NO2 B) AlNO3 C) Al(NO3) 3 D) Al2(NO3)2 E) Al2(NO3)3

C) Al(NO3) 3

Which group of elements contains only non-metals? A) V, Cr, Mn B) Cl, Ar, K C) C, S, I D) P, As, Se E) Mg, Ca, Sr

C) C, S, I

What is the correct formula for iron(II) chloride? A) FeCl B) Fe3Cl C) FeCl2 D) Fe2Cl

C) FeCl2

The nuclear reaction shown below is an example of what type of process? 224 / 90 Th → 220 / 88 Rn + 4 / 2 He A) fission B) beta decay C) alpha decay D) fusion E) translation

C) alpha decay

Which of the following would NOT be a physical change? A) tearing a piece of aluminum foil B) freezing water to make ice cubes C) burning gasoline in a lawnmower D) boiling water for soup E) melting gold to make jewelry

C) burning gasoline in a lawnmower

The correct name of CoS is A) copper sulfide B) cobalt(I) sulfide C) cobalt(II) sulfide D) copper(I) sulfide E) copper(II) sulfide

C) cobalt(II) sulfide

The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction? CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) A) double replacement B) combination C) combustion D) endothermic E) single replacement

C) combustion

The ability of an atom to attract the shared electrons in a covalent bond is its A) bonding ability. B) polarity. C) electronegativity. D) nonpolarity. E) ionic character

C) electronegativity.

In the Sun, nuclei of hydrogen combine to form a larger nucleus and release a great amount of energy. The process is known as A) metathesis. B) chain reaction. C) fusion. D) fission. E) ionization.

C) fusion.

An anion always A) contains a group of two or more atoms with a positive charge. B) contains a metal and a nonmetal. C) has a negative charge. D) forms covalent bonds. E) has a positive charge.

C) has a negative charge.

If the reaction shown below is exothermic, the energy level of the reactants is H2(g) + O2(g) → 2H2 O(g) A) lower than that of the products. B) possibly lower, possibly higher than that of the products. C) higher than that of the products. D) the same as that of the products

C) higher than that of the products.

What is the major type of intermolecular force in the molecule of ammonia, NH3? A) ionic bonds. B) dispersion forces. C) hydrogen bonds. D) dipole-dipole attractions. E) polar covalent.

C) hydrogen bonds.

The compound MgCl2 is named A) magnesium chlorine. B) magnesium(II) chloride. C) magnesium chloride. D) magnesium dichloride. E) dimagnesium chloride.

C) magnesium chloride.

Oxygen dibromide, OBr2, has a shape similar to A) carbon monoxide. B) hydrogen chloride. C) water. D) carbon tetrachloride. E) carbon dioxide.

C) water.