Exothermic Reactions Quiz

What is an exothermic reaction?

• A reaction that absorbs heat

• A reaction that releases heat

• A reaction that does not involve heat

• A reaction that stores energy

What happens to the temperature of a substance during an exothermic reaction?

• It increases

• It decreases

• It remains the same

• It fluctuates

In an exothermic reaction, heat is transferred from:

• The surroundings to the system

• The system to the surroundings

• One reactant to another

• The products to the reactants

Which of the following is NOT an example of an exothermic reaction?

• Combustion

• Neutralization

• Photosynthesis

• Oxidation

What type of energy change occurs in an exothermic reaction?

• Energy is absorbed

• Energy is released

• Energy remains unchanged

• Energy is lost

What is the role of oxygen in a combustion reaction?

• It acts as a catalyst

• It reacts with fuel to release heat

• It cools down the reaction

• It prevents the reaction from occurring

Which of the following best describes a combustion reaction?

• A reaction where oxygen is removed

• A reaction that occurs without oxygen

• A reaction where oxygen reacts with fuel to produce heat

• A reaction where oxygen is absorbed

Which equation represents an exothermic reaction?

• Reactants → Products + Energy

• Reactants + Energy → Products

• Energy → Reactants + Products

• Products → Reactants + Energy

What is a real-life example of an exothermic reaction?

• Melting ice

• Boiling water

• Burning wood

• Photosynthesis

Which factor is necessary for combustion to take place?

• Fuel

• Oxygen

• Heat

• All of the above