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Exothermic Reactions
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Why does temperature increase during an exothermic reaction?
 
Energy is released into the surroundings
 
Heat is absorbed into the surroundings
 
Reactants gain energy
Which of the following is an exothermic phase change?
 
Freezing of water
 
Boiling of water
 
Melting of ice
Which of the following is an example of an exothermic reaction involving a salt?
 
Potassium nitrate decomposing to form potassium nitrite and
 
Sodium hydroxide dissolving in water
 
Calcium chloride dissolving in water
What is the general equation for combustion of a hydrocarbon?
 
Hydrocarbon + oxygen → carbon dioxide + water + heat
 
Hydrocarbon + oxygen → carbon monoxide + heat
 
Hydrocarbon + water → carbon dioxide + heat
What kind of energy change occurs in exothermic reactions?
 
Energy is released into the surroundings
 
Energy is absorbed into the system
 
No energy change occurs
Which of the following would release energy when cooled?
 
Steam condensing to water
 
Water boiling to steam
 
Ice melting to water
What is one way to prevent heat loss during an exothermic reaction experiment?
 
Use an insulated container
 
Use a metal container
 
Conduct the reaction in an open space
Why is combustion considered an exothermic reaction?
 
It produces heat and light energy
 
It absorbs heat from the surroundings
 
It cools down the surroundings
What is released during combustion?
 
Carbon dioxide and heat
 
Oxygen
 
Nitrogen
Which of the following is a common example of an exothermic reaction?
 
Respiration
 
Photosynthesis
 
Dissolving salt in water
What happens to the temperature of the surroundings during an exothermic reaction?
 
It increases
 
It decreases
 
It remains constant
Which of the following reactions is exothermic?
 
Freezing of water
 
Melting of wax
 
Boiling of water
What are the products of a reaction between magnesium and hydrochloric acid?
 
Magnesium chloride and hydrogen
 
Magnesium chloride and oxygen
 
Magnesium hydroxide and hydrogen
What is another name for combustion?
 
Burning
 
Freezing
 
Rusting
Which of the following is an exothermic reaction?
 
Combustion of methane
 
Melting of ice
 
Evaporation of water
What is an exothermic reaction?
 
A reaction that releases heat to its surroundings
 
A reaction that absorbs heat from its surroundings
 
A reaction with no temperature change
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