General, Organic, and Biochemistry Hybrid Edition by 2nd Edition by James Armstrong - Test Bank

General, Organic, and Biochemistry Hybrid Edition by 2nd Edition by James Armstrong – Test Bank

 

Instant Download – Complete Test Bank With Answers

 

 

Sample Questions Are Posted Below

 

1. Consider the following image.

This is a representation of a chemical reaction.
a. True
b. False
ANSWER: True

2. An aqueous solution of sodium nitrate (NaNO3) is used in a reaction. The following should be used in the chemical equation for the reaction.
NaNO3(l)
a. True
b. False
ANSWER: False

3. Consider the following reaction.

The mass relationship between sodium (Na) and oxygen (O2) is:

a. True
b. False
ANSWER: False

4. When magnesium reacts with nitrogen, the reaction container becomes very hot. The ΔH for this reaction will have a positive sign.
a. True
b. False
ANSWER: False

5. One Hawaiian ® sweet roll contains:

2.5 g fat
18 g carbohydrate
4.0 g protein

The total energy content of four rolls (to two significant figures) is 440 Calories.
a. True
b. False
ANSWER: True

6. The following represents a balanced chemical equation.

Al(NO3)3(aq) + Na 3PO4 (aq) → AlPO4(s) + 3NaNO3(aq)
a. True
b. False
ANSWER: True

7. The following represents a typical energy diagram.

 

The reaction represented by this energy diagram is endothermic.
a. True
b. False
ANSWER: False

8. Decreasing the temperature will decrease the number of collisions that result in product formation.
a. True
b. False
ANSWER: True

9. Reactions that have a low energy of activation tend to proceed at a faster rate.
a. True
b. False
ANSWER: True

10. Consider the following image representing an equilibrium mixture. The black spheres represent the reactant and the gray spheres the product.

If this reaction was started with only reactants, at equilibrium about 67% of the reactant was converted to product.
a. True
b. False
ANSWER: True

11. Consider the following image representing an equilibrium mixture. The black spheres represent the reactant and the gray spheres the product.

This reaction was started with only reactants present. If the reaction had been started with only product present, the equilibrium mixture would contain 4 gray spheres and 8 black spheres.
a. True
b. False
ANSWER: False

12. Based on the following energy diagram, the activation energy for the reaction represented is approximately 40 kcal.

a. True
b. False
ANSWER: True

13. Based on the following energy diagram, the heat of reaction for the reaction represented is approximately 20 kcal.

a. True
b. False
ANSWER: True

14. When you perspire, your body is cooled because the evaporation of moisture from you skin is an exothermic process.
a. True
b. False
ANSWER: False

15. The following reaction could be classified as a combustion reaction.
2Al2O3 (s) → 4Al(s) + 3O2(g)
a. True
b. False
ANSWER: False

16. During the carbon cycle plants produce the oxygen that is consumed by animals.
a. True
b. False
ANSWER: True

17. Overall the reactions that occur during respiration can be classified as combustion reactions.
a. True
b. False
ANSWER: True

18. The combustion of glucose per gram produces more energy than the combustion of an equal mass of triolein (a fat).
a. True
b. False
ANSWER: False

19. The process that converts the energy stored in molecules to a form usable by an animal is respiration.
a. True
b. False
ANSWER: True

20. Photosynthesis and respiration are linked to each other in the nitrogen cycle.
a. True
b. False
ANSWER: False

21. When you inhale (breathe in), oxygen is entering your respiratory system and when you exhale (breathe out), carbon dioxide is leaving your respiratory system.
a. True
b. False
ANSWER: True

22. Which of the following is a physical property of matter?
a. does not burn.
b. produces a gas when placed in an acid
c. freezes at −10°F
d. the surface of a solid turns black in air
ANSWER: c

23. A block of iron forming a pool of the liquid metal is correctly classified as
a. a chemical change.
b. a physical change.
c. both a chemical and a physical change.
d. neither a chemical nor a physical change.
ANSWER: b

24. According to the law of mass conservation, which of the following may NEVER occur as a result of a chemical reaction?
a. creation of new chemical species
b. reaction of starting materials
c. rearranged to form new substances
d. reduction in total mass
ANSWER: d

25. The reactants in a chemical reaction are analogous to which of the following?
a. a baked cake
b. the flour, eggs, chocolate used to bake a cake
c. the cake pan.
d. the heat of the oven
ANSWER: b

26. Which of the following statements is not true about the reaction as written below?

a. Hydrogen is a reactant.
b. C2H4 is a reactant.
c. The reaction is balanced.
d. The reaction is at equilibrium.
ANSWER: d

27. Which of the following reactions is correctly balanced?
a. N2 + H → 2NH3
b. 2H2O + C → CO + 2H2
c. Zn + 2HCl → H2 + ZnCl2
d. CO + O2 → CO2
ANSWER: c

28. When the equation below is properly balanced, what coefficient is of KClO3?
KClO3 → KCl + O2
a. 1
b. 2
c. 3
d. 4
ANSWER: b

29. The Haber Process is a method for the production of ammonia, an important chemical intermediate. The reaction for this process is:
N2 + 3H2 → 2NH3
When the equation is correctly interpreted in terms of moles, how many moles of H2 will react with one mole of N2?
a. 1
b. 2
c. 3
d. 6
ANSWER: c

30. Ethanol is produced industrially by the acid catalyzed reaction of ethylene with water. The balanced equation for this reaction is:
C2H4(g) + H2O(g) → C2H5OH(l)
If water is present in excess, how many grams of ethanol can be produced from 5.75 g of ethylene?
a. 265 g
b. 0.205 g
c. 3.50 g
d. 9.44 g
ANSWER: d

31. How many moles of N2 are required to completely react with 3.53 grams of H2 for the following balanced chemical equation?
N2 + 3H2 → 2NH3
a. 16.4 mol
b. 1.17 mol
c. 0.584 mol
d. 5.25 mol
ANSWER: c

32. Consider the following generic reaction.
2 A(s) + 3 B(l) → C(g)
If 58.0 g of A reacted completely with B to produce 100.8 g of C, what mass of B reacted?
a. 58.0 g
b. 174 g
c. 87.0 g
d. 42.8 g
e. The mass cannot be determined without knowing the identities of reactants and products.
ANSWER: d

33. In the equation for an exothermic reaction, the word “energy” appears
a. on the right side.
b. on the left side.
c. on both sides.
d. on neither side.
ANSWER: a

34. Consider the following reaction:

This reaction:
a. is endothermic.
b. has a negative ΔH.
c. makes the surroundings warmer.
d. converts chemical energy into thermal energy.
ANSWER: a

35. When natural gas (predominantly methane, CH4) burns in air. The following reaction occurs. How much energy is involved in the combustion of 13.0 g of methane?

a. kcal
b. 16.4 kcal
c. 173 kcal
d. 0.979 kcal
ANSWER: c

36. Consider the following reaction.
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
If 25.0 mL of a 0.100 M solution of NaOH reacted with excess HCl, how many moles of NaCl could form?
a. 25.0 mol
b. 0.100 mol
c. 0.00250 mol
d. 2.50 mol
ANSWER: c

37. Consider the following reaction.
NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)
Which of the following represents the correct mass relationships, respectively, across the balanced equation?
a. 40.00 g NaOH, 98.08 g H2SO4, 142.04 g Na2SO4, 18.02 g H2O
b. 40.00 g NaOH, 40.04 g H2SO4, 142.04 g Na2SO4, 9.010 g H2O
c. 80.00 g NaOH, 98.08 g H2SO4, 142.04 g Na2SO4, 36.04 g H2O
d. 80.00 g NaOH, 98.08 g H2SO4, 142.04 g Na2SO4, 18.02 g H2O
ANSWER: c

38. Which of the following most closely defines the term “reaction rate”?
a. the temperature needed to initiate a reaction
b. the position of a reaction at equilibrium
c. the speed of a reaction
d. the activation energy in the presence of a catalyst
ANSWER: c

39. Which of the following will influence all reaction rates?
a. the presence of catalysts
b. the temperature of reactants
c. the concentration of reactants
d. More than one response is correct.
ANSWER: d

40. If the reaction given below occurs and pure A and B were mixed, which of the following would take place as equilibrium was established?
A + B C
a. The concentration of C would increase for a time, then remain constant.
b. The concentration of A would increase for a time, then decrease.
c. The concentration of B would increase for a time, then remain constant.
d. Both a and c will occur.
ANSWER: a

41. Consider the following reaction.

How many grams of sucrose would produce 2546 kcal?
a. 649.4 g
b. 1342 g
c. 180.4 g
d. 1.897 g
ANSWER: a

42. Many molecular collisions do not result in chemical reaction. Which of the following explains this observation?
a. The colliding molecules may not be the correct chemicals.
b. The colliding molecules do not have sufficient energy.
c. The colliding molecules do not have the correct orientations.
d. All of the above are potential factors.
ANSWER: d

43. If a reaction occurs very rapidly, even at a relatively low temperature, which of the following is probably true?
a. The reaction is endothermic.
b. The reaction is exothermic.
c. The reaction has a low activation energy.
d. The reaction is at equilibrium.
ANSWER: c

44. Which of the following is the best definition of a catalyst?
a. A catalyst is a material that speeds up the rate of a chemical reaction.
b. A catalyst is a material that speeds up the rate of a chemical reaction without participating in the reaction.
c. A catalyst is a material that speeds up the rate of a chemical reaction without being consumed during the reaction.
d. All of the above are equally good definitions.
ANSWER: c

45. Consider a sample of water in a closed container. When the reaction

H2O(l) H2O(g)

has reached equilibrium, what can we say about any specific water molecule?
a. If it was present in the liquid it will always remain in the liquid.
b. If it was present in the gas it will always remain in the gas.
c. It will sometimes be in the liquid phase and sometimes in the gas phase.
d. Both a and b are true.
ANSWER: c

46. Which of the following symbols is used to denote a reversible reaction?
a. →
b. ←
c.
d. ↔
ANSWER: c

47. If the ‘Nutrition Facts’ on a food label contains Total Fat 5.0 g, Total Carbohydrate 35 g, and Total Protein 7.0 g, how many Total kcal would be needed for the average healthy person to burn this food item?
a. 1.8 × 102 kcal
b. 2.1 × 102 kcal
c. 4.2 × 102 kcal
d. 4.0 × 102 kcal
ANSWER: b

48. When the following equation is balanced using integers,

the number of atoms of carbon represented in reactants or products is:
a. 8 atoms.
b. 4 atoms
c. 6 atoms.
d. 10 atoms.
ANSWER: a

49. What is the name of a branch on the principal carbon chain that contains three carbon atoms?
a. pentyl
b. propyl
c. ethyl
d. methyl
ANSWER: b

50. Which of the following the appropriate ending for the name of many aromatic compounds?
a. benzene
b. ane
c. yne
d. ene
ANSWER: a

Complete the following sentence using the terms provided below.

nutritive value
carbohydrate
protein
fat
Calorie
kilocalorie
energy content

51. _______________________refers to the characteristic amount of heat produced when a nutrient is burned.
ANSWER: Nutritive value
nutritive value

52. Per gram ________________________ produces the largest amount of energy when burned.
ANSWER: Fat
fat
Fats
fats

53. The following would be classified as a _______________________reaction.

ANSWER: combustion
Combustion

Consider the following energy diagram showing a reaction with and without a catalyst. .

 

Fill in the blank with the appropriate letter (A, B, C, etc.).

54. The activation energy of the catalyzed reaction is represented by_____________________.
ANSWER: C
c

55. The heat of reaction would be represented by _____________________.
ANSWER: A
a

56. The lowering of the activation energy by the catalyst is represented by__________________.
ANSWER: B
b

Copper reacts with nitric acid as given in the following reaction.

 

Predict the effect of the given change on the rate of the reaction by filling in the blank with one of the following terms.

increase
decrease
no effect

57. The copper metal is ground into a very fine powder. ______________________
ANSWER: increase
Increase

58. The temperature of the reaction is decreased. _____________________
ANSWER: decrease
Decrease

59. The concentration of the nitric acid is increased. ______________________
ANSWER: increase
Increase

60. A catalyst is added to the reaction mixture. ____________________
ANSWER: increase
Increase

Complete each of the following sentences using one of the terms listed below.

physical change
chemical change
reactant
product
coefficient
physical state

61. The image below represents a________________.

ANSWER: physical change

62. The image below represents a________________.

ANSWER: chemical change

63. In the image below hydrogen sulfide represents the________________.

ANSWER: product

64. Consider the image below. In the balanced chemical equation hydrogen would be written as H2(g) where the parenthetical designation represents its________________.

ANSWER: physical state.

65. Consider the image below. If the balanced equation for this reaction were written oxygen would have a ___________ of 1.

ANSWER: coefficient

66. Draw the energy diagram for the following reaction which represents the burning of the amino acid alanine.

Indicate on the diagram the activation energy and the heat of reaction.
ANSWER:

67. When 15.0 g of sucrose is burned during metabolism in the body according to the following equation, what mass in grams of oxygen is needed?

ANSWER: 16.8 g

68. When a nickel-cadmium battery is recharged, the following reaction occurs. What mass in grams of nickel(II) hydroxide is consumed if 2.40 g of Cd is produced?

ANSWER: 3.96 g