Chemical Reactions and Energy Quiz

When chemical reactions occur, what happens to energy?

• Energy is created.

• Energy is destroyed.

• Energy is conserved.

• Energy is lost.

In an exothermic reaction, what happens to the temperature of the surroundings?

• It decreases.

• It remains the same.

• It increases.

• It fluctuates.

Which of the following is an example of an exothermic reaction?

• Thermal decomposition

• Reaction of citric acid and sodium hydrogencarbonate

• Combustion

• Sports injury packs

In an endothermic reaction, what happens to the energy of the product molecules compared to the reactants?

• Product molecules have less energy than reactants.

• Product molecules have the same energy as reactants.

• Product molecules have more energy than reactants.

• Product molecules have fluctuating energy levels.

Which of the following is an example of an endothermic reaction?

• Combustion

• Neutralisation

• Thermal decomposition

• Oxidation reactions

What is the minimum amount of energy that particles must have to react called?

• Reaction energy

• Activation energy

• Collision energy

• Minimum energy

Which type of reaction releases heat to the surroundings, resulting in products having less energy than reactants?

• Endothermic

• Exothermic

• Isothermic

• Thermodynamic

In an endothermic reaction, what happens to the energy?

• Energy is released to the surroundings

• Energy is taken in from the surroundings

• Energy remains constant

• Energy is converted to mass

What must be supplied to break bonds in the reactants during a chemical reaction?

• Energy

• Mass

• Pressure

• Volume

What is the overall energy change in a reaction where the energy taken in to break bonds is greater than the energy released when bonds are formed?

• Exothermic

• Isothermic

• Endothermic

• Thermodynamic