Chemical Reactions Observation Worksheet

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Date:

🔬 Part 1: Experimental Observations

1. Experiment 1: Combustion Reaction

Observe the burning magnesium ribbon and complete the following:

Colour change: _________________ → _________________

Light produced: ________________________________________

Gas evolution: _________________________________________

Temperature change: ____________________________________

Type of reaction: ____________________________________

2. Experiment 2: Displacement Reaction

Observe zinc + copper sulfate solution and record your observations:

Solution colour change: _________________ → _________________

Metal formation observed: _______________________________

Temperature change: ____________________________________

Other observations: ___________________________________

Type of reaction: ____________________________________

3. Experiment 3: Acid-Base Neutralisation

Observe calcium carbonate + hydrochloric acid and complete:

Gas evolution (bubbles): _______________________________

Temperature change: ____________________________________

Solution appearance: __________________________________

Sound/fizzing: ______________________________________

Type of reaction: ____________________________________

📝 Part 2: Analysis Questions

4. Which experiment produced the most obvious temperature change? Explain your evidence.

5. Complete this sentence frame for each experiment:

Combustion: I know this was a combustion reaction because _________________________

_________________________________________________________________

Displacement: I know this was a displacement reaction because ____________________

_________________________________________________________________

Neutralisation: I know this was an acid-base reaction because ____________________

_________________________________________________________________

6. Which observable signs indicate that a chemical reaction has occurred? Tick all that apply:

Colour change

Gas evolution (bubbles)

Temperature change

Precipitate formation

Light production

Change in shape only

🎯 Part 3: Matching Quiz

7. Match each reaction type with its key observational clue. Draw lines to connect them.

Combustion Reaction

Displacement Reaction

Acid-Base Neutralisation

One metal replaces another in solution

Rapid gas evolution with fizzing sound

Bright light and heat production

8. Choose the most important safety rule when conducting these experiments:

Always wear safety goggles and gloves

Work as quickly as possible

Mix all chemicals together

Taste the products to identify them

9. Describe one example of a chemical reaction you might observe in everyday life:

Chemical Reactions Observation Worksheet

Chemical Reactions Observation Worksheet

🔬 Part 1: Experimental Observations

📝 Part 2: Analysis Questions

🎯 Part 3: Matching Quiz

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