🧪 Part 1: Chemical Concepts

1. Which of the following is an element?

Water (H₂O)

Oxygen (O₂)

Salt (NaCl)

Sand and water mixture

2. A compound is different from a mixture because:

Compounds can be separated physically

Compounds are made of only one type of atom

Compounds have atoms chemically bonded together

Compounds always contain water

3. Which of these are examples of chemical reactions? (Check all that apply)

Mixing vinegar and baking soda

Dissolving salt in water

Burning wood

Melting ice

4. The smallest unit of an element that still has the properties of that element is called:

A molecule

An atom

A compound

A mixture

⚗️ Part 2: Classification and Applications

5. Classify each substance as Element (E), Compound (C), or Mixture (M):

Iron (Fe): _______ Air: _______ Carbon dioxide (CO₂): _______

Salt water: _______ Gold (Au): _______ Sugar (C₆H₁₂O₆): _______

6. Explain how you would separate a mixture of sand and salt using physical methods:

7. Draw and label a water molecule (H₂O) showing the atoms and their arrangement:

8. Complete this word equation for the reaction between vinegar and baking soda:

Vinegar + Baking soda → _____________ + _____________ + _____________

🌍 Part 3: Real-Life Applications

9. Explain why understanding chemical bonds is important for agriculture in Uganda:

10. A farmer needs to purify water that contains soil, salt, and small pieces of leaves. Suggest two different separation methods they could use and explain when each would be most useful:

11. Give one example of how chemical knowledge is used in each of these careers in Uganda:

Medicine: _________________________________________________

Cooking: __________________________________________________

Manufacturing: _____________________________________________

Chemical Foundations Review

Chemical Foundations Review

🧪 Part 1: Chemical Concepts

⚗️ Part 2: Classification and Applications

🌍 Part 3: Real-Life Applications

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