simple science j

Section A: Short Answer Questions (2–3 marks each)

1. Define the term chemistry.
2. Name two branches of chemistry.
3. State three physical properties of matter.
4. List any three laboratory rules you must follow while in the chemistry lab.
5. Give two differences between an element and a compound.
6. Name two common apparatus used for measuring volume.
7. What is the main purpose of a Bunsen burner in a chemistry lab?
8. State two differences between physical and chemical changes.
9. Give one example each of:
   • (a) A physical change
   • (b) A chemical change
10. State two safety precautions when handling acids in the lab.

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Section B: Structured Questions (4–10 marks each)

1. (4 marks)
   A line passes through the points (1,2)(1, 2)(1,2) and (3,6)(3, 6)(3,6).
   (a) Find the gradient of the line.
   (b) Determine the equation of the line in the form y=mx+cy = mx + cy=mx+c.
2. (6 marks)
   The diagram below shows a Bunsen burner:
   (a) Name the labeled parts: barrel, collar, base.
   (b) Explain how the collar is used to control the flame.
   (c) State the color of a luminous and non-luminous flame.
3. (5 marks)
   Differentiate between the following terms with one example each:
   • Mixture vs. Compound
   • Physical change vs. Chemical change
   • Homogeneous mixture vs. Heterogeneous mixture
4. (10 marks)
   You are given a mixture of iron filings and sulphur powder. Describe how you would separate them using physical and chemical methods. Include the steps and the observations.

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Section C: Naming and Identification (1 mark each)

1. Identify the following substances as element, compound, or mixture:

• Oxygen
• Salt
• Air
• Iron
• Water