🧪 Part 1: Multiple Choice Questions - Answer Key

Correct answers are indicated with explanations.

✏️ Part 2: Short Answer Questions - Answer Key

Sample answers are provided for guidance.

Element: A pure substance that cannot be broken down into simpler substances by chemical means.

Compound: A substance formed when two or more elements are chemically bonded together.

Mixture: A combination of two or more substances that are not chemically bonded and can be separated by physical means.

Answer: Methane + Oxygen → Carbon dioxide + Water

🔬 Part 3: Applied Knowledge - Answer Key

Atomic Number: 6

Element Symbol: C

Atomic Mass: 12

Answer: a) 6 protons, b) 6 electrons, c) Carbon

Atomic Number: 8

Element Symbol: O

Atomic Mass: 16

Answer: a) 8 protons, b) 8 electrons, c) Oxygen

Atomic Number: 11

Element Symbol: Na

Atomic Mass: 23

Answer: a) 11 protons, b) 11 electrons, c) Sodium

In your explanation, consider the following points:

• Neutralisation occurs when an acid reacts with a base to form a neutral solution.
• The pH scale represents the acidity or alkalinity of a solution.
• The increase in pH from 1 to 7 indicates that the acid is being neutralised by the base.

📋 Success Criteria & Support

To be successful in this assessment, students should be able to:

✓ Recall symbols for the first 20 elements

✓ Distinguish between elements, compounds, and mixtures

✓ Explain periodic table organisation and atomic structure

✓ Identify properties of metals and non-metals

✓ Recognise signs of chemical reactions

✓ Write simple word equations

✓ Understand acid-base reactions and pH changes

Differentiation Support:

🔤 For dyslexia-friendly reading: Use a ruler under each line, take breaks between sections

📚 Extra support: Refer to your periodic table and notes if needed

⭐ Extension: Explain your reasoning for multiple choice answers on the back