Extra Credit Chemistry

81. Which atom is likely to form a -3 ion? Oxygen Nitrogen Al Li

Nitrogen

145. Which Lewis structure is possible for N20

Nitrogen shares a coordinate bond and two regular bonds with another nitrogen and on regular bond and a coordinate bond with an oxygen

116. Which of the following formulas would contain the strongest bonds?

Nitrogen triple bonded to another nitrogen

118. Which of the following formulas would contain the strongest bonds?

Nitrogen triple bonded to another nitrogen

9. Is the chemical of the reaction for the combustion of methane balanced? If not, select the correct equation from the ones listed below.

No. CH4 + 2O2 —-> CO2 + 2H2O

2. What is the correct equilibrium constant expression for the formation of ammonia gas from nitrogen gas and hydrogen gas?

PNH3/PN3*PH2

22. Evidence for a chemical includes all of the following EXCEPT Color change Production of bubbles Phase change Temperature change

Phase change

154. Of the following, the one which most likely involves a chemical reaction is Placing a solid and a liquid together produces heat and a gas. Hitting a board with a hammer forms a dent in the surface of the wood. Slicing a piece of bread produces two pieces. Heating an ice cube produces liquid water.

Placing a solid and a liquid together produces heat and a gas

25. Of the following, the one which most likely involves a chemical reaction is: Heating an ic cube produces liquid water. Placing a solid and a liquid together produces heat and gas. Slicing a piece of bread produces two pieces. Hitting a board with a hammer forms a dent in the surface of the wood.

Placing a solid and a liquid together produces heat and gas.

95. What is the correct name for K3PO4

Potassium phosphate

155. Which of the following unit is not an SI (Metric) unit? Millimeters Meters Pounds Kilograms

Pounds

89. According to the modern concept of the atom, which are located in the nucleus of an atom? Protons only Protons and neutrons Electrons and protons Neutrons and electrons

Protons and neutrons

127. The illustration above is an example of which of the following?

Resonance

84. You have a 5.0 g sample of each of the following elements: Ra, Rob, Rh, Rn, Ru. Which sample contains the most atoms? Rb Rh Ra Ru

Rh

101. Classify the following reaction 3CuSO4 + 2Al —-> Al2(SO4)3 + 3Cu

Single-displacement or single replacement

93. What state of matter will this substance be in at a temperature of 28 degrees C and a pressure of 0.7 atm? Liquid Solid Gas In equilibrium between solid and gas

Solid

33. Which is the state change that occurs when a solid becomes a gas without becoming a liquid first? Freezing Vaporization Deposition Sublimation

Sublimation

112. What is small whole number to the right in a chemical formula indicating the number of atoms in a molecule

Subscript

63. Matter that has a uniform and unchanging composition is known as a Substance element Compound Sugar

Substance

48. Which is the term used to describe the energy required to increase the surface are of a liquid?

Surface tension

133. The independent variable is which of the following?

Temperature

57. Heat capacity is defined as The amount of heat necessary to raise the temperature of a system by 1C 4.18 J/g C 4.18 cal/gC The amount of heat necessary to raise the temperature of 1 gram of a substance by 1 C None of the above

The amount of heat necessary to raise the temperature of a system by 1C

20. What madd of silver iodide can be made by the reaction of 10 g of silver nitrate (AgNO3) with 10 g of sodium iodide (NaI)?

13.8

92. At what temperature will this substance melt if the pressure is held constant at 1.2 atm 88 C 130 C The substance does not melt at this temperature 68 C

130 C

52. How many neutrons are in an atom of chlorine? 35 17 34 18

18

114. If 16.4 g of oxygen gas react with excess hydrogen, what mass of water is produced?

18.5 g

74. The mass of a single atom of zirconium is 1.515 x 10-23 grams. Which is a correct method for determining the molar mass of Zr? 1g/1.515 (6.o22 x 10^23 atoms/ 1 mole)

1g/1.515 (6.o22 x 10^23 atoms/ 1 mole)

122. Which is the correct electron configuration for the element Molybdenum?

1s22s22p63s23p64s23d104p65s24d4

32. How many possible resonance structures exist for the formate ion, HCO2? 2 8 4 3

2

40. The calculation of 3.2215+1.67+0.23 would have how many significant figures? 1 2 5 3

2

66. Which two have the same mass? 1 & 4 2 & 4 1 & 2 2 & 3

2 & 4

106. What are the values for x and y, respectively, in Alx(SO4)y

2 and 3

38. What are the values for x and y, respectivel, in Al(SO4)y 1 and 3 2 and 3 1 and 1 3 and 2

2 and 3

3. How many atoms of aluminum (Al), sulfur (S), and oxygen(O) are in each molecule of Al2(SO4)3

2- aluminum, 3-sulfur,12-oxygen

99. How many moles of ammonia can be made by reacting 7 mol of N2 with 4 mol of H2

2.7 mol

140. What volume does 22.4 moles of hydrogen gas occupy at 0 C and 1 atm?

22.4 L

104. Which is the number of protons in 56 Fe 26

26

110. The combustion of methanol, CH3OH, yields carbon dioxide and water as products. Which of the reactions below is correct and properly balanced?

2CH3OH(l) + 3O2(g) —-> 2CO2 + 2H2O(g)

120. 2.500 grams of MgSO4 x H2O, a hydrated salt with an unknown water content, is dried in an oven to remove the water. After drying, the anhydrous salt has mass of 1.221 grams. How many moles of water are present per mole of hydrated magnesium sulfate?

3

28. How many possible resonance structures exist for sulfur trioxide? 6 4 8 3

3

107. A balloon is filled with 3.50 L of water at 24 C and 2.27 atm. The balloon in the figure is placed outside on a hot day, what is the volume of the balloon?

3.61 L

141. Determine the heat of reaction for the oxidation of iron

33.2

7. An ethylene gas torch requires 3200 L of gas at 3 atm. What will be the pressure of the gas is ethylene is supp,ied by a 250 L tank?

38.4

69. The calculation of 22.81/2.2457 would have how many significant figures? 9 4 10.16 5

4

12. A bicycle tire is filled to a pressure of 4.42 atm (65 psi) at a temperature of 12 C. If the temperature of the tire increases to 33C, what is the pressure in the tire? Assume the volume of the tire is constant.

4.75 atm

11. Which is the number of neutrons in 80 Br? 35

45

14. A mass of 4 g of H2(g) reacts with 2 g of O2 (g). If 1.94 g of H2O(l) is collected, what is the percent yield of the reaction? 2H2(g) + O2(g) —> 2H2O(l)

49%

76. For the reaction below, the partial pressures of gases at equilibrium are as follows: H2=7.1 x 10^-5 atm, Cl2 = 2.5 x 10^-6 atm, and = 3m. What is the value of the equilibrium constant, Kp?

5.1*10^10

78. Aluminum has a specific heat of 0.902 J/g C. If 35 g of water at 98.8C loses 4.94 kJ of heat, what is the temperature of 8.50 grams of aluminum from 25 C to 93.4 C

524 J

131. What is the percent composition of silicon nitride

54.03%Si and 45.97%N

34. Balance the following equation to demonstrate the conservation of atoms in a reaction. Choose the answer which provides the correct coefficients for each reactant and product. __________Fe + __________O2->________Fe2O3 (2,3,1) (4,3,2) (2,1,1) (1,2,3)

(4,3,2)

148. Correct formula for ammonium sulfate is (NH4)2SO3 (NH3)2SO3 (NH4)2SO4 NH4SO4

(NH)2SO4

125. Formula for ammonium sulfate

(NH4)2SO4

125. The correct formula for ammonium sulfate is

(NH4)2SO4

75. Perform the following calculation with the correct number of significant figures: 5.453 + 8.34 - 20.1 + 4 - 6.321

-8.63

113. What quantity of gas, in moles, is contained in 2.21 L at STP?

.0987 Mol

147. A balloon is filled with oxygen gas to a volume of 1.75 L at 36 C. The balloon is then heated to 72C. What is the volume of the heated balloon?

.875

45. How many moles are present in 0.098 grams of HCl

0.0027

29. The volume noted in the figure contains nitrogen gas under a pressure of 2.487 atm at 15.9C. Calculate the number of moles of nitrogen in the tank. 0.018 mol 0.525 mol 1.90 mol 0.002

0.525 mol

144. The number of oxygen atoms in Mg(OH)2 is

1

138. When propane undergoes completer combustion, the products are carbon dioxide and water.

1 5 3 4

67. Which two are isotopes of one another? 1 & 4 2 & 4 1 & 2 2 & 3

1 & 4

55. The pre-fix mili represents which of the following values?

1.0x10-3

1. What volume does .0685 mol of gas occupy at STP?

1.53

132. What is the mass in grams of 0.338 mol of glucose(C6H12O6)

1.88

61. The volume noted in the figure contains nitrogen gas under a pressure of2.487 atm at 15.9C. Calculate the number of moles of nitrogen in the tank. 0.018 mol 0.525 1.90 0.002

1.90mol

51. How many electrons are in a neutral atom of sodium? 22 23 11 12

11

94. Which is the point at which this substance will boil at normal atmospheric pressure

110 C, 1 atm

119. The catalytic conversion of ammonia to nitric oxide is the first step in a three-step process which ultimately results in nitric acid. Balance the equation for the reaction.

6,15,6,9

73. The molar madd of argon is 39.95 g/mole. What is the mass off a single argon atom?

6.634 x 10-23

83. Determine the heat of reaction for the decomposition of one mole of benzene to acetylene. C6H6-3CH2 2C6H6 + 15O —> 12CO2 + 6H2O delta H -6271kJ 2C2H2 + 5O2 —> 4CO2 + 2H2O delta H -2511kJ

631 kJ

77. What're has a specific heat of 4.18 J/g C. If 35 g of water at 98.8 C loses 4.94 kJ of heat, what is the temperature of the water?

65 C

96. A 1.45 g sample of chromium contains ___________ atoms

8.73 x 10^23

91. Which is the triple point of this substance?

88 degrees C 0.95 atm

5. In the chemical equation, 2HCL + CaCl2 + 2H20, the number of atoms of reactant is

9

129. Which is the correct symbol for the atom with 42 protons and 49 neutrons

91 Mo 42

105. Perform the following calculation with the calculation with the correct number of significant figures 20 x 11.55/.00004 x 58.38

98920.8

41. Which is the most probable location for an electron in this orbital? A C D B

A

6. In which following situations does water undergo a change in physical properties?

A and b only

62. Which statement provides the best description of a covalent bond? A covalent bond is the attraction between opposite charges of ions in a compound. A covalent bond is usually stronger than an ionic bond A covalent usuallyforma between a metal and a nonmetal

A covalent bond is usually stronger than an ionic bond

35. Which of the following formations is a physical property of copper? A formation of a drill gauge and wire. A deep blue solution when in contact with ammonia A new substance when combined with nitric acid A green copper carbonate compound when in contact with moist air

A formation of a drill gauge and wire.

88. Use the VESPR theory to predict the molecular geometry of phosgene, Cl2CO t-shaped Triangular bipyramidial Triangular planar Tetrahedral

A triangular planar

82. What is the name of a compound with the formula of MgCl2? Monomagnesium dichloride Magnesium chloride Magnesium chlorine Magnesium dichloride

Magnesium chloride

23. Which of the following changes requires an input of thermal energy

Evaporation

153. The correct formula for iron (III) nitrate is Fe(NO3)2 FE3(NO3)2 FE2(NO3)2 FE(NO3)3

Fe(NO3)3

24. The correct formula for iron (III) nitrate is Fe2(NO3)2 Fe3(NO3)2 Fe(NO3)3 FE(NO3)2

Fe(NO3)3

102. Which of the following should never be used on a person?

Fire extinguisher

136. When a chemical change occurs

All of the above

53. A pair of electrons that is shared between two atoms is A double bond An ionic bond A covalent bond Both a covalent bond and a double bond

An ionic bond

56. Which one is comprised of the other three? Proton Neutron Atom Electron

Atom

90. Which is the smallest part of an element that retains all the properties of the element? Electron Proton Neutron Atom

Atom

18. The box for an element from the periodic table is shown. Which is the atomic number?

B

130. Which is NOT an assumption of matter made by kinetic molecular theory of gases?

Gas particles are small and take up little volume relative to the voluminous the space around them.

135. The dependent variable is which of the following?

Gender of the alligator

13. Which atom is likely to form a -3 ion?

N

98. A pair of electrons that is shared between two atoms is

Both a covalent bond and a double bond

70. Which law describes the proportional relationship between the pressure and volume of a gas? Gay-Lussac's Law Charles's Law Natural Law Boyle's Law

Boyle's Law

47. Which of the following would be appropriate for measuring the mas of a can of soda?

Grams

117. Which question would be the best high level scientific question?

How fast will a tennis ball bounce off if thrown against the wall

149. Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d4 Titanium Sulfur Chromium Selenium

Chromium

43. If the same amount of heat is added to 1 g of each of the following substances, which substance will undergoe the largest temperature change

Cl2

134. The constant variable is which of the following?

Incubator

58. What is the whole number placed in front of a molecular formula in a chemical equation called? Subscript Superscript Coefficient Mole

Coefficient

15. The group to which experiment data compared to, which has known value or behavior, is known as which of the following:

Control

137. What is the correct formula for chromium(III) nitrate?

Cr(NO3)3

49. What is the correct formula for chromium nitrate?

Cr(NO3)3

126. Chalocopyrite is a mineral which contains 34.62% Cu, 30.43% Fe, and 34.95% S. What is the chemical formula for Chalocopyrite

CuFeS2

126. What is the chemical formula for chalcopyrite

CuFeS2

123. On the phase diagram below, which point corresponds to conditions where solid, liquid, and gas phases all exist

D

19. The box for an element from the periodic table is shown. Which is the atomic mass?

D

103. A large equilibrium constant

Indicates that the reaction favors the formation of products

10. Identify the reactants in the combustion of methane.

CH4 and O2

8. Identify the products in the combustion of methane

CO2 and H2O

16. Of the following equations, the one which is NOT balanced is:

Ca + O2-> CaO

143. What is the correct name for CS2

Carbon disulfide

What is the correct name for Cs? Carbon sulfide Carbon(IV) sulfide Carbon disulfide Carbon sulfur

Carbon disulfide

26. The statement, " the process of breaking chemical bonds and reforming new bonds to create new substances" can be used to describe: Both physical and chemical change Chemical change only Neither physical nor chemical change Physical change only

Chemical change only

46. Which is not a chemical change

Ingredients for a cake are stirred together

44. Which of the following describes a code one in the lab?

Injured student

39. An industrially important element contains 26 electrons and rusts in the prescence of air and moisture. Sodium Iron Potassium Aluminum

Iron

72. Which of the following is not a qualification of a good hypothesis? Is worded as an if/then statement It is a prediction Stated the independent and dependent variable Is an educated guess

It is a prediction

79. What is the correct formula for lithium oxide?

Li2O

4. Which of the following is a vase metric unit?

Liter

37. Identify the ions and their charges in NA2SO4 Na+, SO42- Na+, SO4- Na2+, SO4- Na2+, SO42-

Na+, SO42-

124. Identify the ions and their charges in NA2SO4

Na+,SO4

27. What is the name of the compound with the formula of MgCl2? Monomagnesium dichloride Magnesium chloride Magnesium chlorine Magnesium dichloride

Magnesium chloride

128Cu(OH)2—>CuO + H2O

Decomposition

21. Classify the following reaction. Cu(OH)2—>CuO + H2O Single replacement Addition or synthesis Decomposition Double replacement or double displacement

Decomposition

Classify the following reaction:

Decomposition

36. The single variable which is manipulated and changed by researchers during an experiment,who's results are compared to a known value, is called which of the following: Independent Variable Constant Dependent Variable Control

Dependent Variable

71. The single variable which is observed and studied during an experiment, who's results are compared to a known value, is called which of the following: Independent variable Dependent variable Control Constant

Dependent variable

121. Classify the following reaction

Double replacement

156. All of the following statements are true EXCEPT Enthalpy change is dependent upon the number of steps in a reaction Enthalpy is a state function Delta H for a reaction is equal in magnitude but opposite in sign to Delta H for the revers reaction At a constant pressure the heat flow for a reaction equals the change in enthalpy

Enthalpy change is dependent upon the number of steps ina reactiom

97. Which pre-fix corresponds to value of one billion?

Mega

111. Which pre-fix corresponds to value of one-millionth (10^-6)

Micro

152. 333 cm is equivalent to 0.333 Meters Kilometers Decameters Millimeters

Millimeters

30. Which of the following is the best hypothesis? The height that a tennis ball will bounce depends on the temperature it is at when bounced. If I freeze a tennis ball, then it will not bounce as high. Tennis balls bounce better when not cold. Frozen tennis balls will not bounce as high.

The height that a tennis ball will bounce depends on the temperature it is at when bounced.

151. If the volume of a confined gas is doubled at constant temperature, what change is observed? The velocities of the molecules are doubled The density of the gas is doubled The pressure of the gas is decreased to 1/2nof its original blue The pressure of the gas is increased to twice its original value

The pressure of the gas is decreased to 1/2 of its original value

142. If the volume of a confined gas is doubled at a constant temperature, what change is observed?

The pressure of the gas is decreased to one-half of its original size

115. Which of the statements concerning the relative rates of reaction is correct for the chemical equation below?

The rate of disappearance of N2 is twice the rate of formation of NH3

68. The principle of conservation of atoms is satisfied in a chemical equation when

The reactant side has the same number of each type of atom as the product side

108. The molar masses of helium and oxygen are 4 g/mol and 16g/mol, respectively. At the same temperature and pressure, 1 mole of helium will occupy

The same volume as 1 mole of oxygen

17. Which statement best describes what happens to sodium and chlorine atoms when they combine to form sodium chloride?

The sodium atom becomes a negative sodium ion, and the chloride atom becomes a positive chloride ion.

54. Which statement best describes what happens to sodium and chlorine atoms when they combine to form sodium chloride?

The sodium atom becomes a positive sodium ion, and the chlorine atom becomes a negative chloride ion.

50. All of the following statements are true EXCEPT

The value of a is negative in an endothermic process

59. Use the VESPR theory to predict the molecular geometry of BH3 Tetrahedral Triangular pyramidal Triangular bipyramidal Triangular planar

Triangular planar

146. Which is defined as the combination of pressure and temperature at which all three states of matter can coexist at equilibrium

Triple point

80. Which Lewis structure is possible for N2O

Two nitrogens triple bonded together and one double bonded to an oxygen

31. Which change in state requires that energy be added to the substance? Vaporizing Condensing Freezing Deposition

Vaporizing

150. The _____ in a balanced equation specify volume ratios for gaseous reactants and products. Variables Masses Coefficients Constants

Variables

109. All of the following relationships are false for gases EXCEPT

Volume is directly proportional to temperature in Kelvin

139. All of the following relationships are false for gases EXCEPT

Volume is directly proportional to temperature in Kelvin

86. The sum of the oxidation numbers in a neutral compound is always A negative number A positive number Zero One

Zero

87. aNH3 + bOCl- —cN2H4 + dCl- + eH2O

a=2 b=1 c=1 d=1 e=1

85.What is the correct name for K3PO4? Potassium(1) phosphate Potassium phosphate Tripotassium phosphate Potassium(1) monophosphorous tetraoxide

potassium phosphate