1. Practice Test: Chemistry

2. True/False

3. All samples of matter must be pure substances or compounds.
a. True
b. False

4. All samples of matter must be pure substances or compounds.
a. True
b. False
– pure substances or mixtures

5. Solutions are homogeneous mixtures with a constant composition.
a. true
b. false

6. Solutions are homogeneous mixtures with a constant composition.
a. true
b. false

7. Alkali metals react vigorously with water, oxygen and noble gases.
a. true
b. false

8. Alkali metals react vigorously with water, oxygen and noble gases.
a. true
b. false - noble gases do not react

9. A chlorine atom has one more electron than a chloride ion.
a. true
b. false

10. A chlorine atom has one more electron than a chloride ion.
a. true
b. false
- chloride ion has one more electron than a chlorine atom

11. The reactivity of a non-metal increases down a family.
a. true
b. false

12. The reactivity of a non-metal increases down a family.
a. true
b. false - up a family

13. Fill in the blanks:
Complete the following sentences with the correct term or phrase.

14. A compound consists of substances combined in _________ proportions.

15. A compound consists of substances combined in definite proportions.

16. Two types of pure substances are _________ and _________.

17. Two types of pure substances are elements and compounds.

18. The rusting of iron is an example of a __________ change.

19. The rusting of iron is an example of a chemical change.

20. Isotopes of an element have different ________ _______ but the same _______ ________.

21. Isotopes of an element have different atomic masses but the same atomic numbers.

22. The alkali metals have one less electron in the outer shell than the ________ _________ ________.

23. The alkali metals have one less electron in the outer shell than the alkaline earth metals.

24. In the periodic table, elements in the same ________ have similar properties.

25. In the periodic table, elements in the same family have similar properties.

26. A solution is also known as a _________ mixture.

27. A solution is also known as a homogeneous mixture.

28. A group of elements across the periodic table is called a ________.

29. A group of elements across the periodic table is called a period.

30. The nucleus of an atom consists of __________ and _________.

31. The nucleus of an atom consists of protons and neutrons.

32. The energy levels surrounding the nucleus consist of __________.

33. The energy levels surrounding the nucleus consist of electrons.

34. Matching:
Match the term in Column B with the description in Column A.

35. Column A Column B
___ the process involving a. covalent the formation of a bond new compound
___ the basis for arranging b. chemical elements in the periodic change table.
___ a change in state or form c. ionic bond
___ the sharing of electrons d. atomic number
___ one atom gives up its e. physical electron to another atom change

36. Column A Column B
_b_ the process involving a. covalent the formation of a bond new compound
___ the basis for arranging b. chemical elements in the periodic change table.
___ a change in state or form c. ionic bond
___ the sharing of electrons d. atomic number
___ one atom gives up its e. physical electron to another atom change

37. Column A Column B
_b_ the process involving a. covalent the formation of a bond new compound
_d_ the basis for arranging b. chemical elements in the periodic change table.
___ a change in state or form c. ionic bond
___ the sharing of electrons d. atomic number
___ one atom gives up its e. physical electron to another atom change

38. Column A Column B
_b_ the process involving a. covalent the formation of a bond new compound
_d_ the basis for arranging b. chemical elements in the periodic change table.
_e_ a change in state or form c. ionic bond
___ the sharing of electrons d. atomic number
___ one atom gives up its e. physical electron to another atom change

39. Column A Column B
_b_ the process involving a. covalent the formation of a bond new compound
_d_ the basis for arranging b. chemical elements in the periodic change table.
_e_ a change in state or form c. ionic bond
_a_ the sharing of electrons d. atomic number
___ one atom gives up its e. physical electron to another atom change

40. Column A Column B
_b_ the process involving a. covalent the formation of a bond new compound
_d_ the basis for arranging b. chemical elements in the periodic change table.
_e_ a change in state or form c. ionic bond
_a_ the sharing of electrons d. atomic number
_c_ one atom gives up its e. physical electron to another atom change

41. Multiple Choice

42. Sulphuric acid is used in many industrial processes
Sulphuric acid is used in many industrial processes. If concentrated sulphuric acid has a density of 1.84 g/ml, what is the mass of a 26.2 mL sample?
A g B g C g D. 28 g E g

43. Sulphuric acid is used in many industrial processes
Sulphuric acid is used in many industrial processes. If concentrated sulphuric acid has a density of 1.84 g/ml, what is the mass of a 26.2 mL sample?
A g B g C g D. 28 g E g

44. A mixture that is heterogeneous is classified as:
A. a pure mixture B. an element C. a solution D. a mechanical mixture E. a compound

45. A mixture that is heterogeneous is classified as:
A. a pure mixture B. an element C. a solution D. a mechanical mixture E. a compound

46. A pure substance is which of the following:
A. an element B. a compound C. a solution D. a mechanical E. both A and B

47. A pure substance is which of the following:
A. an element B. a compound C. a solution D. a mechanical E. both A and B

48. Which of these ideas about atomic structure was developed by Rutherford? A. electrons orbit in fixed shells B. atomic number should be the basis for the periodic table C. the atom has a nucleus and an electron cloud D. the muffin model E. all atoms of an element are identical

49. Which of these ideas about atomic structure was developed by Rutherford? A. electrons orbit in fixed shells B. atomic number should be the basis for the periodic table C. the atom has a nucleus and an electron cloud D. the muffin model E. all atoms of an element are identical

50. Which atom or ion has the same number of electrons as the Cl- ion?
A. Ne B. Cl C. K+ D. Li+ E. N5+

51. Which atom or ion has the same number of electrons as the Cl- ion?
A. Ne B. Cl C. K+ D. Li+ E. N5+

52. To which chemical family does the element neon belong?
A. alkali metals B. alkaline earth metals C. halogens D. noble gases E. none of the above

53. To which chemical family does the element neon belong?
A. alkali metals B. alkaline earth metals C. halogens D. noble gases E. none of the above

54. The element with the symbol B is:
A. potassium B. mercury C. beryllium D. silver E. boron

55. The element with the symbol B is:
A. potassium B. mercury C. beryllium D. silver E. boron

56. How many atoms are in one molecule of NH4NO3?
A. 3 B. 4 C. 9 D. 14 E. 7

57. How many atoms are in one molecule of NH4NO3?
A. 3 B. 4 C. 9 D. 14 E. 7

58. How much mercury (D=13.6 g/cm3) would it take to make 100 kg?
A. 136 mL B mL C mL D mL E. none of the above

59. How much mercury (D=13.6 g/cm3) would it take to make 100 kg?
A. 136 mL B mL C mL D mL E. none of the above

60. The use of electricity to cause chemical changes in substances is called
A. electrostatics B. electrolysis C. electrification D. synthesis

61. The use of electricity to cause chemical changes in substances is called
A. electrostatics B. electrolysis C. electrification D. synthesis

62. Only one of the following statements is correct
Only one of the following statements is correct. Identify that statement.
A. All compounds are pure substances B. All mixtures are heterogeneous C. All pure substances are elements D. All solutions consist of a solid dissolved in a liquid

63. Only one of the following statements is correct
Only one of the following statements is correct. Identify that statement.
A. All compounds are pure substances B. All mixtures are heterogeneous C. All pure substances are elements D. All solutions consist of a solid dissolved in a liquid

64. Which one of the following statements about the particles in a piece of silver is incorrect? A. All of the particles have the same mass B. The particles are always moving C. There are strong forces of attraction between the particles D. As the temperature increases, the particles move more slowly

65. Which one of the following statements about the particles in a piece of silver is incorrect? A. All of the particles have the same mass B. The particles are always moving C. There are strong forces of attraction between the particles D. As the temperature increases, the particles move more slowly

66. Which of the following materials, based on appearance, is not a solution?
A. Perfume B. Vinegar C. Spaghetti sauce D. Apple juice

67. Which of the following materials, based on appearance, is not a solution?
A. Perfume B. Vinegar C. Spaghetti sauce D. Apple juice

68. Protons are
A. positively charged particles found outside the nucleus in an atom B. negatively charged particles found outside the nucleus in an atom C. neutral particles found in the nucleus in an atom D. positively charged particles found in the nucleus in an atom.

69. Protons are
A. positively charged particles found outside the nucleus in an atom B. negatively charged particles found outside the nucleus in an atom C. neutral particles found in the nucleus in an atom D. positively charged particles found in the nucleus in an atom.

70. The atomic model has been modified many times over the years
The atomic model has been modified many times over the years. This happened because
A. scientists have become smarter with time. B. new evidence became available to scientists. C. the actual nature of the atom has changed with time. D. more elements were discovered.

71. The atomic model has been modified many times over the years
The atomic model has been modified many times over the years. This happened because
A. scientists have become smarter with time. B. new evidence became available to scientists. C. the actual nature of the atom has changed with time. D. more elements were discovered.

72. Which one of the following is an example of a chemical change?
A. the melting of candle wax B. making sawdust by sawing wood C. the rotting of food D. the breaking of glass

73. Which one of the following is an example of a chemical change?
A. the melting of candle wax B. making sawdust by sawing wood C. the rotting of food D. the breaking of glass

74. An example of a physical change is
A. toasting a piece of bread B. the explosion of dynamite C. boiling water D. the rusting of iron

75. An example of a physical change is
A. toasting a piece of bread B. the explosion of dynamite C. boiling water D. the rusting of iron

76. The number of electrons in the outermost orbit of a phosphorus atom is
A. 2 B. 8 C D. 15

77. The number of electrons in the outermost orbit of a phosphorus atom is
A. 2 B. 8 C D. 15

78. The least reactive element in the following list is
A. argon. B. gold. C. potassium.
D. copper.

79. The least reactive element in the following list is
A. argon. B. gold. C. potassium.
D. copper.

80. Isotopes of the same element have
A. the same number of protons and a different number of neutrons. B. the same number of neutrons and a different number of protons. C. the same number of protons and a different number of electrons.
D. the same number of electrons and a different number of protons.

81. Isotopes of the same element have
A. the same number of protons and a different number of neutrons. B. the same number of neutrons and a different number of protons. C. the same number of protons and a different number of electrons.
D. the same number of electrons and a different number of protons.

82. Which of the following is a chemical property of carbon. A
Which of the following is a chemical property of carbon? A. It is a black solid. B. In the form of graphite, it conducts electricity. C. It is insoluble in water. D. It burns readily.

83. Which of the following is a chemical property of carbon. A
Which of the following is a chemical property of carbon? A. It is a black solid. B. In the form of graphite, it conducts electricity. C. It is insoluble in water. D. It burns readily.

84. Substances composed of identical atoms are A. mixtures. B. elements. C
Substances composed of identical atoms are A. mixtures. B. elements. C. compounds. D. solutions.

85. Substances composed of identical atoms are A. mixtures. B. elements. C
Substances composed of identical atoms are A. mixtures. B. elements. C. compounds. D. solutions.

86. Which of the following statements is not part of Dalton's atomic theory? A. All substances are composed of small, indivisible particles called atoms. B. The atoms of a given element are identical in every respect. C. The three main particles in atoms are protons, neutrons, and electrons. D. In chemical reactions, atoms combine in simple, whole-number ratios.

87. Which of the following statements is not part of Dalton's atomic theory?
A. All substances are composed of small, indivisible particles called atoms. B. The atoms of a given element are identical in every respect. C. The three main particles in atoms are protons, neutrons, and electrons. D. In chemical reactions, atoms combine in simple, whole-number ratios.

88. Which substance in the following list is a compound?
A. Salt B. Carbon C. Sulphur D. Neon

89. Which substance in the following list is a compound?
A. Salt B. Carbon C. Sulphur D. Neon

90. One model of the atom is sometimes referred to as the "raisin bun" model. In this model, the raisins represent the A. protons B. neutrons C. nucleus D. electrons

91. One model of the atom is sometimes referred to as the "raisin bun" model. In this model, the raisins represent the A. protons B. neutrons C. nucleus D. electrons

92. When molecules combine, they form atoms.
A. True B. False

93. When molecules combine, they form atoms.
A. True B. False - atoms combine to form molecules

94. Metals are usually shiny and poor conductors of electricity.
A. True B. False

95. Metals are usually shiny and poor conductors of electricity.
A. True B. False - shiny and good conductors of electricity

96. Physical changes result in the formation of new substances.
A. True B. False

97. Physical changes result in the formation of new substances.
A. True B. False - chemical changes result in new substances

98. In the modern periodic table, elements with similar properties appear in the same row.
A. True B. False

99. In the modern periodic table, elements with similar properties appear in the same row.
A. True B. False - same group/family

100. Elements in the same column have the same number of electrons in their highest orbit.
A. True B. False

101. Elements in the same column have the same number of electrons in their highest orbit.
A. True B. False

102. A test tube of gas causes a burning splint to make a "pop" sound
A test tube of gas causes a burning splint to make a "pop" sound. The gas is:
A. carbon dioxide B. hydrogen C. oxygen D. nitrogen

103. A test tube of gas causes a burning splint to make a "pop" sound
A test tube of gas causes a burning splint to make a "pop" sound. The gas is:
A. carbon dioxide B. hydrogen C. oxygen D. nitrogen

104. Short Answer:
Write a sentence or a short paragraph to answer each of the following questions.

105. State three quantitative physical properties that could be used to help identify an unknown metal.

106. melting point of the metal

107. melting point of the metal
density of the metal

108. melting point of the metal
density of the metal
boiling point

109. Explain with examples the difference between.

110. physical property and chemical property

111. Physical property: - A physical property is something that can be observed or measured without forming a new substance.
For example: colour, odour, melting point, density

112. Chemical Property:
A chemical property describes how a substance reacts with another substance and forms something new.
For example: combustibility, How it reacts with . . .?

113. chemical change and physical change

114. chemical change:
a change in which a substance with new properties is created
ex. burning wood

115. physical change:
a change in state or form, no new substance is created
ex. cutting wood

116. metal and non-metal

117. metal: lustrous, malleable, conducts electricity
ex. copper
non-metal: not lustrous, not-malleable, does not conduct electricity
ex. sulfur

118. What is electrolysis?
How does Dalton’s Atomic Theory explain the electrolysis of water?

119. What is electrolysis?
occurs when electricity is passed through a substance
How does Dalton’s Atomic Theory explain the electrolysis of water?

120. What is electrolysis?
occurs when electricity is passed through a substance
How does Dalton’s Atomic Theory explain the electrolysis of water?
water is made up of smaller atoms of hydrogen and oxygen, when electricity is passed through water it separates into the two gases

121. Distinguish between the terms “mass number” and “atomic number”.

122. mass number - the number of protons and neutrons in the nucleus

123. mass number - the number of protons and neutrons in the nucleus
atomic number - the number of protons in the nucleus

124. Why is an atoms outermost shell of electrons important?

125. Why is an atoms outermost shell of electrons important?
- the outer shell of electrons (valence electrons) are involved in chemical reactions

126. How did Bohr modify Rutherford’s model of the atom?

127. How did Bohr modify Rutherford’s model of the atom?
- Bohr replaced the “electron cloud” with electron shells to explain why the electrons do not crash into the nucleus

128. As you go down a group of non-metals, does the chemical reactivity increase or decrease?

129. As you go down a group of non-metals, does the chemical reactivity increase or decrease?
- reactivity decreases as you go down a family of non-metals

130. As you go down a group of metals, does the chemical reactivity generally increase or decrease?

131. As you go down a group of metals, does the chemical reactivity generally increase or decrease?
- the reactivity increases as you down a group of metals

132. Describe the apparatus used by Rutherford to investigate Thompson’s model of the atom.

133. Describe the apparatus used by Rutherford to investigate Thompson’s model of the atom.
- Rutherford aimed alpha particles at a very thin piece of gold foil

134. What did Rutherford expect to see and what did he see?

135. What did Rutherford expect to see and what did he see?
- Rutherford expected all the alpha particles to go through the gold foil

136. What did Rutherford expect to see and what did he see?
- Rutherford expected all the alpha particles to go through the gold foil
- most of the alpha particles went through the foil but some were deflected and some even bounced back

137. Describe Rutherford’s new model of the atom.
What did he discover?

138. Describe Rutherford’s new model of the atom.
- Rutherford described a small, dense, positive centre and had the electrons on the outside in an electron cloud.
What did he discover?

139. Describe Rutherford’s new model of the atom.
- Rutherford described a small, dense, positive centre and had the electrons on the outside in an electron cloud.
What did he discover?
- the nucleus

140. State two physical properties and one chemical property of oxygen.
How would you test an unknown gas to determine if it was oxygen?

141. State two physical properties and one chemical property of oxygen
State two physical properties and one chemical property of oxygen. - physical properties - clear, colourless gas - chemical property - helps burning
How would you test an unknown gas to determine if it was oxygen?

142. State two physical properties and one chemical property of oxygen
State two physical properties and one chemical property of oxygen. - physical properties - clear, colourless gas - chemical property - helps burning
How would you test an unknown gas to determine if it was oxygen? - insert a glowing splint into the gas, the splint will relight if oxygen is present

143. How many oxygen atoms are represented in the formula of each of the following substances?
MgO
Fe2O3
P2O5

144. How many oxygen atoms are represented in the formula of each of the following substances?
MgO - one
Fe2O3
P2O5

145. How many oxygen atoms are represented in the formula of each of the following substances?
MgO - one
Fe2O3 - three
P2O5

146. How many oxygen atoms are represented in the formula of each of the following substances?
MgO - one
Fe2O3 - three
P2O5 - five

147. Find the element Cesium (Cs) in the periodic table
Find the element Cesium (Cs) in the periodic table. From its position in the periodic table make a prediction for each of the following statements.

148. Is Cesium a metal or a non-metal?

149. Is Cesium a metal or a non-metal?

150. Is Cesium more or less reactive than sodium?

151. Is Cesium more or less reactive than sodium?
- more reactive than sodium

152. Is Cesium malleable or brittle?

153. Is Cesium malleable or brittle?

154. What is its state at room temperature?

155. What is its state at room temperature?
- solid

156. Complete the following chart
Change
P or C
Reason
1. Cutting bread
2. Rusting iron
3. Boiling water
4. Burning paper
5. Toasting bread

157. Complete the following chart
Change
P or C
Reason
1. Cutting bread P
Change in shape
2. Rusting iron
3. Boiling water
4. Burning paper
5. Toasting bread

158. Complete the following chart
Change
P or C
Reason
1. Cutting bread P
Change in shape
2. Rusting iron C
New colour
3. Boiling water
4. Burning paper
5. Toasting bread

159. Complete the following chart
Change
P or C
Reason
1. Cutting bread P
Change in shape
2. Rusting iron C
New colour
3. Boiling water
Change in state
4. Burning paper
5. Toasting bread

160. Complete the following chart
Change
P or C
Reason
1. Cutting bread P
Change in shape
2. Rusting iron C
New colour
3. Boiling water
Change in state
4. Burning paper
New substance
5. Toasting bread

161. Complete the following chart
Change
P or C
Reason
1. Cutting bread P
Change in shape
2. Rusting iron C
New colour
3. Boiling water
Change in state
4. Burning paper
New substance
5. Toasting bread

162. What is the density of a sample of metal that has a mass of 525 g and volume of 225 mL?

163. What is the density of a sample of metal that has a mass of 525 g and volume of 225 mL?
given
m = 525 g
V = 225 mL

164. What is the density of a sample of metal that has a mass of 525 g and volume of 225 mL?
given
m = 525 g
V = 225 mL
want
D = ?

165. What is the density of a sample of metal that has a mass of 525 g and volume of 225 mL?
given D = m/V
m = 525 g
V = 225 mL
want
D = ?

166. What is the density of a sample of metal that has a mass of 525 g and volume of 225 mL?
given D = m/V
m = 525 g D = 525 g/225mL
V = 225 mL
want
D = ?

167. What is the density of a sample of metal that has a mass of 525 g and volume of 225 mL?
given D = m/V
m = 525 g D = 525 g/225mL
V = 225 mL D = 2.3 g/mL
want
D = ?

168. That’s it!!
Good Luck Tomorrow!!