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Exothermic Reactions

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  • What is the general equation for combustion of a hydrocarbon?
    Hydrocarbon + water → carbon dioxide + heat
    Hydrocarbon + oxygen → carbon dioxide + water + heat
    Hydrocarbon + oxygen → carbon monoxide + heat
  • 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
  • Why does temperature increase during an exothermic reaction?
    Reactants gain energy
    Heat is absorbed into the surroundings
    Energy is released into the surroundings
  • Which of the following is an exothermic phase change?
    Melting of ice
    Boiling of water
    Freezing of water
  • Why is combustion considered an exothermic reaction?
    It produces heat and light energy
    It absorbs heat from the surroundings
    It cools down the surroundings
  • Which of the following reactions is exothermic?
    Boiling of water
    Freezing of water
    Melting of wax
  • Which of the following is an example of an exothermic reaction involving a salt?
    Calcium chloride dissolving in water
    Sodium hydroxide dissolving in water
    Potassium nitrate decomposing to form potassium nitrite and
  • 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
  • What happens to the temperature of the surroundings during an exothermic reaction?
    It decreases
    It remains constant
    It increases
  • What is released during combustion?
    Carbon dioxide and heat
    Nitrogen
    Oxygen
  • What are the products of a reaction between magnesium and hydrochloric acid?
    Magnesium hydroxide and hydrogen
    Magnesium chloride and hydrogen
    Magnesium chloride and oxygen
  • Which of the following is an exothermic reaction?
    Melting of ice
    Evaporation of water
    Combustion of methane
  • Which of the following would release energy when cooled?
    Water boiling to steam
    Steam condensing to water
    Ice melting to water
  • Which of the following is a common example of an exothermic reaction?
    Dissolving salt in water
    Respiration
    Photosynthesis
  • What is one way to prevent heat loss during an exothermic reaction experiment?
    Use a metal container
    Conduct the reaction in an open space
    Use an insulated container
  • What is another name for combustion?
    Rusting
    Freezing
    Burning
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