WorksheetsChemistry Quiz
Total questions: 62
Worksheet time: 1hrs 8mins
1. You mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred?
A. The beaker becomes warm.
B. You see gas bubble out of solution.
C. Solution A, solution B, and the mixture are all yellow.
D. None of the above; all help prove that a chemical reaction has occurred.
2. In the reaction described by the word equation:
sodium + water ------> sodium hydroxide + hydrogen gas
A. Sodium hydroxide is a product.
B. Sodium is a product.
C. Water is a reactant.
D. Both (A) and (C)
3. Which of the following indicates that a chemical equation is balanced?
A. The numbers of atoms of each element are the same on both sides of the equation.
B. All of the coefficients are the same.
C. The numbers of molecules on each side of the equation are equal.
D. The sums of the coefficients on each side of the equation are equal.
4. From a complete and correctly written chemical equation, you can obtain the
A. Chemical formulas of the reactants and products.
B. Relative amounts of the reactants and products.
C. Physical states of the reactants and products.
D. All of the above
5. To balance a chemical equation, you must
A. Adjust the subscripts.
B. Adjust the number of products.
C. Adjust the number of reactants.
D. Adjust the coefficients.
6. The formation of a solid product in a chemical reaction is represented by the symbol
A. (Aq)
B. (G)
C. (L)
D. (S)
7. In the expression 3CO2, the numbers 3 and 2 are, respectively,
A. A subscript and a coefficient.
B. A coefficient and a subscript.
C. Two subscripts.
D. Two coefficients.
8. What is the total number of molecules that is represented by the following chemical equation?
NH4NO2 --------> N2 + 2H2O
A. 3
B. 4
C. 8
D. 16
9. Which equation below violates the law of conservation of mass?
A. 2H2 + O2 ---------> 2H2O
B. KCl + Br ----------> KBr + Cl2
C. 2Fe2O3 + 3C -------------> 4Fe + 3CO2
D. Na2CO3 + 2HCl --------------> 2NaCl + H2O + CO2
10. Which of the following equations represents the balanced equation for the reaction of iron and oxygen?
A. 2Fe + O2 ----------> Fe2O3
B. Fe + 3O2 ------------> Fe2O3
C. 4Fe + 3O2 ----------> 2Fe2O3
D. 3Fe + 3O2 ------------> 2Fe2O3
11. Which coefficients correctly balance the formula equation below?
KClO3(s) ------------> KCl(s) + O2(g)
A. 1,1,1
B. 1,1,3
C. 2,2,3
D. 2,1,1
12. A small whole number that appears in front of a formula in a chemical equation is called a(n)
(a)
13. In a chemical equation, the symbol (l) indicates that the substance is
(a)
14. The products re-form the original reactants in a(n)
(a)
Balance the following:
15. AgNO3 + CuCl2 ----------> AgCl + Cu(NO3)2
(a)
Balance the following:
16. PbO2 -----------> PbO + O2
(a)
Balance the following:
17. Zn(OH)2 + CH3COOH -------------> Zn(CH3COO)2 + H2O
(a)
18. In which type of reaction do two or more compounds react to form one product?
A. Synthesis
B. Decomposition
C. Combustion
D. Single-displacement
19. Which of the following is true regarding single-displacement reactions?
A. Only one product is formed.
B. There is only one reagent.
C. It requires oxygen.
D. One element replaces another in a compound.
20. Which of the following is true regarding double-displacement reactions?
A. Two products are formed.
B. The ions of the two reactants must be exchanged.
C. A precipitate may form.
D. All of the above
21. A mixture of propane and oxygen react to form carbon dioxide and water. What type of chemical reaction is this?
A. Synthesis
B. Decomposition
C. Double-displacement
D. Combustion
22. What type of chemical reaction does the following chemical equation represent?
2HCl(aq) + Cr(s) ® H2(g) + CrCl2(aq)
A. Composition
B. Single-displacement
C. Decomposition
D. Double-displacement
23. Calcium carbonate, CaCO3, reacts to form calcium oxide, CaO, and carbon dioxide, CO2. What type of reaction is this?
A. Synthesis
B. Replacement
C. Combustion
D. Decomposition
24. What type of chemical reaction is represented by the following word equation?
iron + oxygen --------------> iron(II) oxide
A. Synthesis
B. Replacement
C. Combustion
D. Double-displacement
25. Metal X replaces the ions of metal Y from solution, but it cannot replace the ions of metal Z from solution. The order these metals should have in the activity series (from top to bottom) is
A. x, y, z
B. z, x, y
C. y, x, z
D. z, y, x
26. In a single-displacement reaction, an element in the activity series most likely can replace any element
A. Above it on the list.
B. In the same group.
C. Below it on the list.
D. In any other group.
27. The activity series helps to predict
A. The amount of product formed by a chemical reaction.
B. Whether or not a specific chemical reaction is possible.
C. The coefficients needed to balance a chemical equation.
D. The amount of energy needed to start a chemical reaction.
Mention the type of chemical reaction:
28. 2H2O(l) -----------------> 2H2(g) + O2(g)
(a)
Mention the type of chemical reaction:
29. Cl2(g) + 2KBr(aq) ----------------> 2KBr(aq) + Br2(l)
(a)
Mention the type of chemical reaction:
30. CaO(s) + H2O(l) -------------> Ca(OH)2(s)
(a)
Mention the type of chemical reaction:
31. HCl(aq) + NaOH(aq) -----------------> NaCl(aq) + H2O(l)
(a)
32. Which of the properties listed below is not characteristic of an acid?
A. A sour taste
B. A slippery feel
C. The ability to conduct an electric current
D. Reactivity with metals
33. Among the physical properties of acids
A. High melting point
B. Electric conduction
C. Protect metals from corrosion
D. All of the above
34. Acetic acid is found in
A. Vinegar
B. The stomach
C. Antacids
D. Oranges
35. What is the correct formula for hydrosulfuric acid?
A. H2SO4
B. H2S
C. H2SO3
D. SO4-2
36. A substance that increases the concentration of OH- ions in an aqueous solution is known as a(n)
A. Arrhenius acid
B. Arrhenius base
C. Amphoteric
D. Lewis base
37. An Arrhenius acid in an aqueous solution
A. Attracts negatively charged anions
B. Attracts positively charged cations
C. Gives up one or more of its hydrogen ions to water molecules
D. Forms ionic bonds with water molecules
38. In the reaction represented by the equation:
HF + H2O ---------> <---------- H3O + F --, a conjugate acid-base pair is
A. F- and H2O
B. H3O+ and HF
C. HF and F-
D. HF and H2O
39. Aqueous solutions of most bases contain
A. Hydroxide ions and cations
B. Hydroxide ions and anions
C. Hydrogen ions and anions
D. Hydrogen ions and cations
Write the scientific term of the following:
40. The species that forms when an acid has given up a proton is called the acid’s
(a)
Write the scientific term of the following:
41. Any species that can react as either an acid or a base is described as
(a)
Answer the following:
42. Compare between acids and bases
(a)
43. A strong base in an aqueous solution
A. Produces many H+ ions.
B. Is a weak electrolyte
C. Completely dissociates into ions.
D. Will not dissolve
44. The main difference between weak and strong bases is the amount of hydroxide ion in a solution.
A. True
B. False
45. Weak bases are more concentrated than strong bases.
A. True
B. False
46. A strong acid
A. Ionizes completely in solution
B. Reacts with metals that are more active than hydrogen
C. Produces hydronium ions in solution
D. All of the above
47. Strong acids dissociate completely into hydroxide ions.
A. True
B. False
48. The value of Kw must always be equal to
A. 1.0 × 107
B. 1.0 × 1014
C. 1.0 × 10-14
D. 1.0 × 10-7
49. Strong bases have low pH value.
A. True
B. False
50. In any solution the H+ ions must always be equal to OH- ions.
A. True
B. False
51. As the pH increases, the concentration of H+ ions is 10 times greater.
A. True
B. False
52. A solution of pH 7 is neither acid nor base.
A. True
B. False
53. The Arrhenius model deals with acids and bases in the manner of hydrogen ion losing and gaining.
A. True
B. False
54. Which of these is the acid?
H2C2O4 + CH3NH2 → HC2O4- + CH3 NH3+
A. HC2O4-
B. CH3 NH3+
C. H2C2O4
D. CH3NH2
55. Which of the properties listed below is not characteristic of an acid?
A. A sour taste
B. Reactivity with metals
C. A slippery feel
D. The ability to conduct an electric current
56. A substance that increases the concentration of OH- ions in an aqueous solution is known as a(n)
A. Arrhenius base
B. Conjugate acid
C. Arrhenius acid
D. Conjugate base
57. Which of these is a conjugate acid?
H2C2O4 + CH3NH2 → HC2O4- + CH3 NH3+
A. H2C2O4
B. HC2O4-
C. CH3NH2
D. CH3NH3+
58. Litmus paper is considered an indicator.
A. True
B. False
59. If a strong acid neutralizes a weak base
A. The solution is acidic after neutralization
B. The solution is basic after neutralization
C. No salt will be produced
D. No reaction will happen
60. Acids react with bases producing
A. Water
B. Salt and water
C. New acids and bases
D. Salt
61. To perform a neutralization reaction in the lab
A. We use titration method
B. We use the hydrolysis process
C. We use evaporation method
D. We use filtration method
62. In a titration process, the concentration of the substance tested in the flask is known but its volume is unknown.
A. True
B. False
