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Grade 9 Science Final Exam Questions

Total questions: 125

Worksheet time: 6hrs 15mins

Name
Class
Date
1.

Define chemical change.

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2.

Give three examples of a chemical change.

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3.

Define chemical reaction.

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4.

Define reactant.

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5.

Define product.

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6.

How many reactants and products can be involved in one chemical reaction?

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7.

Is energy needed or released when you break or form a bond during a chemical reaction?

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8.

How can you detect the change of heat energy during a chemical reaction?

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9.

Give two examples of reactions that involve temperature changes.

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10.

What are some examples that provide evidence of a chemical reaction?

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11.

Define precipitate.

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12.

Give an example of a chemical reaction where the reactants and products have similar physical properties but different chemical properties.

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13.

In which form are substances found in nature? Give an example.

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14.

Give an example of a substance: a. Extracted from nature. b. Invented by chemists.

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15.

Write the word equation for the reaction of decomposition of water into hydrogen and oxygen.

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16.

Write the chemical equation for the reaction of decomposition of water into hydrogen and oxygen.

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17.

Why do scientists use chemical formulas to write chemical equations? Support your answer with an example.

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18.

What information does reading a chemical equation provide?

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19.

How are the states of the reactants and products indicated in chemical reactions?

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20.

What does the abbreviation “aq” refer to in a chemical equation?

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21.

Write the ionic equation of the following reaction: Zn(s) + CuO(aq) → Cu(s) + ZnO(aq)

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22.

Define coefficient.

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23.

Define balanced equation.

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24.

State the law of conservation of mass.

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25.

How can you balance a chemical equation?

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26.

Calculate the total number of each kind of atoms involved in the following chemical reactions: 2H2O→2H2+O2

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27.

What is the ratio of hydrogen to oxygen molecules in the following reaction? 2H2O→2H2+O2

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28.

Why are the smallest whole numbers used to balance chemical equations?

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29.

Define chemical energy.

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30.

What does the chemical energy stored in a molecule depend on?

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31.

What causes the energy exchange in a chemical reactions?

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32.

Relate energy to breaking and forming chemical bonds.

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33.

What is the relationship between the energy of a chemical reaction and the energies of the substances involved in that reaction?

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34.

Define exothermic reaction.

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35.

What is the evidence of an exothermic reaction?

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36.

Define endothermic reaction.

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37.

What is the evidence of an endothermic reaction?

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38.

Define reaction rate.

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39.

Define concentration.

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40.

Give an example of a) a fast chemical reaction b) a slow chemical reaction.

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41.

Are all exothermic reactions faster than endothermic reactions? Explain.

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42.

List three factors that increase the rate of a reaction.

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43.

How does the temperature affect the rate of a reaction? Give an example.

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44.

How does the contact surface area affect the rate of a reaction? Give an example.

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45.

How does increasing the amount of reactants in a fixed volume affect the rate of a reaction? Give an example.

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46.

How does stirring affect the rate of a reaction? Give an example.

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47.

How does a catalyst affect the rate of a reaction? Give an example.

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48.

How does grouping chemical reactions into categories help scientists?

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49.

Give two examples of how scientists classify chemical reactions.

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50.

Define synthesis reaction and give examples.

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51.

Why do scientists use synthesis reactions? Give an example.

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52.

Define decomposition reaction and give examples.

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53.

Compare decomposition reaction to synthesis reaction. Support your answer with an example.

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54.

Give an example of a decomposition reaction that occurs without added energy.

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55.

Define combustion reaction and give examples.

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56.

Define hydrocarbons and give examples.

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57.

What are the products of a combustion reaction between a hydrocarbon and oxygen?

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58.

What does the amount of water and carbon dioxide produced during the combustion of a hydrocarbon depend on?

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59.

How do living organisms get the energy they need to survive?

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60.

What is the overall reaction for cellular respiration?

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61.

To what type of reaction does cellular respiration belong?

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62.

Compare the overall reactions of photosynthesis to that of cellular respiration.

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63.

Define replacement reaction.

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64.

Define single-replacement reaction and give examples.

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65.

Define double-replacement reaction and give an example.

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66.

What causes the energy emitted by uranium?

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67.

Define nuclear reaction.

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68.

Define nuclear radiation.

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69.

Does the law of conservation of mass always apply to nuclear reactions? Explain.

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70.

How did Einstein relate mass to energy?

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71.

What does the stability of the nucleus depend on?

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72.

Define radioactive decay.

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73.

What elements undergo radioactive decay? Give an example.

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74.

Define alpha particle.

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75.

What is meant by alpha decay?

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76.

Define beta particle.

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77.

What is meant by beta decay?

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78.

How does beta decay affect the nucleus?

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79.

Define gamma ray.

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80.

What is meant by gamma decay?

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81.

Define nuclear fission.

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82.

How can the nuclei of uranium-235 be broken apart through nuclear fission?

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83.

What is the effect of nuclear fission on the total number of protons and neutrons?

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84.

What is meant by chain reactions?

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85.

Define nuclear fusion.

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86.

What is the source of energy of the sun?

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87.

How do nuclear fusion reactions occur on the sun?

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88.

What were the first signs in early history?

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89.

Describe scientific inquiry.

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90.

What are the two main branches of science? List some areas of study in each branch.

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91.

List some branches of physics

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92.

How is mathematics used in science? What is its advantage?

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93.

List the main steps of the method used for scientific inquiry.

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94.

Identify and explain the first step of scientific inquiry. Give an example.

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95.

Identify and explain the second step of scientific inquiry. Give an example.

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96.

What is inference?

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97.

What is a hypothesis? Give an example.

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98.

What test groups are needed to perform a controlled experiment?

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99.

What is meant by control group in an experiment?

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100.

What is meant by experimental group in an experiment?

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101.

What is a variable in an experiment?

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102.

What is a scientific data?

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103.

What are qualitative and quantitative data?

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104.

How do scientists draw conclusions?

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105.

Why do scientists communicate their results with other scientists?

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106.

What do all chemical changes have in common?

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107.

What does the energy change during a chemical reaction depend on?

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108.

Why is energy in the form of light evidence of a chemical reaction?

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109.

How do changes in state and colour provide evidence of a chemical reaction?

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110.

How do the chemical and physical properties of reactants compare to those of the products?

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111.

What is one example of how chemists have increased the diversity of matter?

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112.

Define chemical change.

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113.

Define chemical reaction.

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114.

Define reactant.

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115.

Define product.

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116.

What are some examples that provide evidence of a chemical reaction?

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117.

How does a chemical equation show the reactants and products of a reaction?

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118.

When can ionic equations be used to represent a reaction?

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119.

How can you tell that a chemical equation is balanced?

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120.

How can you show that mass is conserved in a reaction?

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121.

Why are whole numbers used to balance chemical equations?

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122.

What is the source of energy that is released by rotting leaves?

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123.

How can you tell if a reaction is exothermic or endothermic?

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124.

How does the concentration of reactants change over time for a reaction that has a fast reaction rate?

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125.

Why are catalysts not reactants?

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