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10
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Which of the following is an exothermic phase change?
Boiling of water
Freezing of water
Melting of ice
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10
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What is another name for combustion?
Burning
Rusting
Freezing
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10
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Which of the following reactions is exothermic?
Freezing of water
Melting of wax
Boiling of water
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10
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What is the general equation for combustion of a hydrocarbon?
Hydrocarbon + oxygen â carbon dioxide + water + heat
Hydrocarbon + oxygen â carbon monoxide + heat
Hydrocarbon + water â carbon dioxide + heat
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banana
Go to last place!
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shark
Other team loses 10 points!
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rocket
Go to first place!
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banana
Go to last place!
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10
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What is an exothermic reaction?
A reaction with no temperature change
A reaction that absorbs heat from its surroundings
A reaction that releases heat to its surroundings
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10
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What are the products of a reaction between magnesium and hydrochloric acid?
Magnesium hydroxide and hydrogen
Magnesium chloride and oxygen
Magnesium chloride and hydrogen
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eraser
Reset score!
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gift
Win 15 points!
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gift
Win 5 points!
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baam
Lose 15 points!
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heart
Other team wins 15 points!
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fairy
Take points!
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25
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shark
Other team loses 25 points!
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thief
Give points!
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10
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Which of the following is an example of an exothermic reaction involving a salt?
Calcium chloride dissolving in water
Potassium nitrate decomposing to form potassium nitrite and
Sodium hydroxide dissolving in water
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10
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Which of the following is an exothermic reaction?
Melting of ice
Evaporation of water
Combustion of methane
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10
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Which of the following is a common example of an exothermic reaction?
Respiration
Dissolving salt in water
Photosynthesis
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10
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What is released during combustion?
Carbon dioxide and heat
Oxygen
Nitrogen
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10
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Which of the following would release energy when cooled?
Ice melting to water
Steam condensing to water
Water boiling to steam
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10
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What kind of energy change occurs in exothermic reactions?
No energy change occurs
Energy is absorbed into the system
Energy is released into the surroundings
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10
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What happens to the temperature of the surroundings during an exothermic reaction?
It increases
It remains constant
It decreases
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