This document outlines six experiments to observe chemical changes. The experiments involve adding iron wool to copper sulfate solution, placing marble chips in hydrochloric acid, mixing sodium sulfate and barium chloride drops, combining bicarbonate of soda and vinegar solutions, adding magnesium to hydrochloric acid, and burning magnesium strips. The goal is to observe signs of chemical reactions occurring and identify common indicators that a chemical reaction has taken place.

1. CHEMICAL CHANGES
YEAR 8 – CHEMICAL CHANGES

2. AIM
Aim: To observe chemical changes

3. EQUIPMENT
• copper sulfate solution
• iron wool
• 2 beakers
• marble chips
• dilute hydrochloric acid
• 1 test tube
• vinegar
• bicarb soda
• 100 mL measuring
cylinder
• magnesium strip
• sodium sulfate
• barium chloride
• dropper plate

4. RISK ASSESSMENT
Risk Injury Prevention
Write your risk assessment here.

5. METHOD
For each of the 6 experiments, make as many
observations as you can.
Part A: Steel wool and copper sulfate
1. Add 20 mL of copper sulfate solution to a beaker.
2. Put a small amount of iron wool into a beaker.
3. Observe what happens to the iron wool and write this
description in your book.

6. METHOD
Part B: Marble chips and hydrochloric acid
1. Put 5 small marble chips into 1cm depth of
hydrochloric acid in a test tube.
2. Record your observations.
Part C: Sodium sulfate and barium chloride
1. Add 3 drops of sodium sulfate and 3 drops of barium
chloride on a dropper plate.
2. Record your observations.

7. METHOD
Part D: Bicarb and vinegar
1. Dissolve a level teaspoon of bicarbonate of soda in
50 mL of water.
2. Add 50 mL of white vinegar in another beaker.
3. Tip the bicarbonate solution into the beaker with the
vinegar.
4. Record your observations.

8. METHOD
Part E: Magnesium and hydrochloric acid
1. Add a small amount (5 cm) of hydrochloric acid in a
test tube.
2. Add a small strip of hydrogen to this test tube.
3. Gently feel the test tube.
4. Record your observations.

9. METHOD
Part F: Burning magnesium (DEMO if
necessary)
1. Light a Bunsen burner.
2. Using tongs to hold a small strip of magnesium near
the flame.
3. Record your observations.

10. RESULTS
Compile a list of all of the signs of chemical
reactions you have encountered today.

11. DISCUSSION
1. Using your results, identify some common signs that
show a chemical reaction has taken place.
2. Were any of your results reversible? Explain why
this might be so?

12. CONCLUSION
Write your conclusion here.