Question 1: Which of the following is a chemical reaction?

Answer: Rusting of iron

Question 2: Match the following terms to their definitions:

Answer: See full answer key

Question 3: Fill in the blank: In a chemical reaction, the substances that react together are called _____.

Answer: reactants

Question 4: Identify the law that states mass is neither created nor destroyed in a chemical reaction.

Answer: Law of Conservation of Mass

Question 5: Explain why a catalyst does not get consumed in a reaction.

Answer: A catalyst provides an alternative pathway for the reaction with a lower activation energy, and it is not consumed because it is regenerated at the end of the reaction.

Question 6: Balance the following chemical equation: H2 + O2 → H2O

Answer: 2H2 + O2 → 2H2O

Question 7: Order the steps in a chemical reaction process: initiation, propagation, termination.

Answer: See full answer key

Question 8: In a neutralization reaction, what are the typical products formed?

Answer: Salt and water

Question 9: True or False: An exothermic reaction absorbs heat from its surroundings.

Answer: False

Question 10: True or False: In an endothermic reaction, the products have more energy than the reactants.

Answer: True

Question 11: What is an exothermic reaction? Provide an example.

Answer: An exothermic reaction is a chemical reaction that releases energy by light or heat. Example: Combustion of methane.

Question 12: Discuss the importance of chemical reactions in industrial processes, giving specific examples.

Answer: Chemical reactions are crucial in industry as they are used to produce a wide range of products, such as pharmaceuticals, fuels, and materials. For example, the Haber process for ammonia production is essential for fertilizers, and the catalytic cracking of hydrocarbons is vital for producing fuels.