Foundational Chemistry Concepts

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🧪 Part 1: Basic Chemistry Knowledge

1. What is an atom? Explain in your own words.

2. Complete the following sentences about the periodic table:

a) Elements in the same column are called _____________.

b) Elements in the same row are called _____________.

c) The atomic number tells us the number of _____________ in an atom.

3. Which of the following are chemical changes? Tick all that apply.

Burning wood

Melting ice

Rusting iron

Cutting paper

Cooking an egg

4. What is the difference between an element and a compound? Give one example of each.

5. Balance the following chemical equation by filling in the missing numbers:

_____ H₂ + _____ O₂ → _____ H₂O

6. What does the chemical formula CO₂ tell us about carbon dioxide?

7. Explain what happens during a chemical reaction in terms of atoms and molecules.

8. A student mixes vinegar (acid) with baking soda (alkali). The mixture fizzes and produces a gas.

a) What type of reaction is this? _______________

b) What gas is likely being produced? _______________

c) How could you test for this gas? _______________

9. A metal object has a mass of 50g and a volume of 5cm³. Calculate its density and suggest what metal it might be.

10. Explain why it's important for a chemist to wear safety goggles and use a fume cupboard when working with acids.