Chemical Reactions Observation Worksheet
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Chemical Reactions Observation Worksheet
Evidence log
The team recorded these observations. Treat them as evidence, not as instructions for doing the experiments.
Reaction
Before
What the team observed
A: Magnesium + oxygen
Silvery magnesium ribbon; air around it
A brilliant white light and intense heat; a white powder remained. No bubbles were seen.
B: Zinc + copper sulfate solution
Grey zinc strip; blue solution
A reddish-brown solid appeared on the zinc. The blue colour faded, and the mixture warmed slightly.
C: Calcium carbonate + hydrochloric acid
White chips; clear, colourless liquid
Steady fizzing and bubbles; the chips became smaller. The mixture felt slightly cooler.
Read the evidence
Use the observation log for Questions 1–6. A reaction can have more than one observable clue, and an observation alone does not always prove exactly which substances formed.
- Combustion
- Displacement
- Neutralisation
- Freezing
- The solution was blue at the start.
- A reddish-brown solid appeared on the zinc.
- The zinc strip was grey at the start.
- The mixture warmed slightly.
- Oxygen
- Carbon dioxide
- Hydrogen
- Nitrogen
Make a scientific conclusion
Choose evidence carefully: some visible changes can happen without a chemical reaction, so support your ideas with more than one clue where possible.
- A: Magnesium + oxygen
- B: Zinc + copper sulfate
- C: Calcium carbonate + hydrochloric acid
- Displacement
- Acid–carbonate reaction
- Rapid reaction with oxygen that releases heat and light
3 printable pages
Page 1
Page 2
Page 3
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