Endothermic and Exothermic Reactions Quiz

Level 1: Basic (Recall/Application)

Write a word equation for the reaction between magnesium and oxygen.

Answer explanation

• Answer: Magnesium + Oxygen → Magnesium Oxide

• • Total: 2 marks

Level 1: Basic (Recall/Application)

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

Answer explanation

Answer: The temperature of the surroundings increases/gets hotter/warms up.

Level 1: Basic (Recall/Application)

Give a simple example of an endothermic process.

Answer explanation

Answer: Melting ice, evaporation of water, boiling water, dissolving some salts.

Level 1: Basic (Recall/Application)

If a reaction caused a beaker to feel warm, what could you conclude about the reaction?

Answer explanation

Answer: The reaction is exothermic.

Level 2: Intermediate (Understanding/Analysis)

Translate the following chemical reaction into a word equation: Methane + Oxygen → Carbon Dioxide + Water.

Answer explanation

Answer: Methane + Oxygen → Carbon Dioxide + Water

Level 2: Intermediate (Understanding/Analysis)

Describe the energy changes that occur during an exothermic reaction, focusing on the energy of the reactants and products.

Answer explanation

Answer: In an exothermic reaction, the energy of the reactants is higher than the energy of the products. Energy is released to the surroundings, causing the temperature to increase.

Level 2: Intermediate (Understanding/Analysis)

Explain how melting ice is an endothermic process but not an endothermic reaction.

Answer explanation

Answer: Melting ice is an endothermic process because it absorbs heat from the surroundings to change state (solid to liquid). It's not a reaction because no new chemical substances are formed; it's a physical change.

Level 2: Intermediate (Understanding/Analysis)

A student mixed two solutions and observed a decrease in temperature. What conclusions can they draw about the type of reaction that occurred and the energy changes involved?

Answer explanation

Answer: The reaction is endothermic. The reaction absorbed heat from the surroundings, causing the temperature to decrease.

Level 3: Advanced (Evaluation/Synthesis)

Given the reactants and products of a combustion reaction, construct a balanced word equation and explain why it is balanced.

Answer explanation

Answer: Example: Propane + Oxygen → Carbon Dioxide + Water. The word equation is balanced because it accurately represents the chemical change, and when converted into a chemical formula equation, the amount of atoms of each element are equal on both sides of the equation.

Level 3: Advanced (Evaluation/Synthesis)

Discuss the role of bond breaking and bond forming in exothermic reactions and how they relate to the overall energy change.

Answer explanation

Answer: Bond breaking requires energy (endothermic), and bond forming releases energy (exothermic). In exothermic reactions, more energy is released during bond formation than is required for bond breaking, resulting in a net release of energy to the surroundings.