Question 1: What is the smallest unit of an element that retains its chemical properties?

Answer: Atom

Question 2: True or False: A compound is made up of two or more different elements chemically combined.

Answer: True

Question 3: Explain the difference between an element and a compound.

Answer: An element is a pure substance made of only one type of atom, while a compound consists of two or more different elements chemically combined.

Question 4: Calculate the formula mass of water (H2O). Use the atomic masses: H = 1, O = 16.

Answer: 18

Question 5: Identify the main difference between a mixture and a compound.

Answer: A mixture is a combination of substances that are not chemically bonded, whereas a compound is composed of elements that are chemically combined.

Question 6: Match the following terms to their definitions:

Answer: See full answer key

Question 7: Arrange the steps of forming a compound from elements in the correct order:

Answer: See full answer key

Question 8: True or False: Elements in a compound retain their individual properties.

Answer: False

Question 9: Fill in the blank: A ________ is a substance made of two or more elements chemically combined in a fixed ratio.

Answer: compound

Question 10: Provide an example of a compound and describe its composition.

Answer: Water is a compound composed of two hydrogen atoms and one oxygen atom.

Question 11: Discuss the importance of understanding the differences between elements, compounds, and mixtures in chemistry. (6 marks)

Answer: Understanding these differences is crucial for studying chemical reactions, predicting compound properties, and applying chemistry in real-world contexts. It helps in identifying substances, balancing chemical equations, and developing new materials.