🧪 Part 1: Pre-Investigation Knowledge

1. Which of the following are indicators that a chemical reaction has occurred? (Select all that apply)

Gas bubbles forming

Change in colour

Temperature change

Formation of a precipitate

Change in shape only

2. What happens to atoms during a chemical reaction?

Atoms are destroyed and new ones are created

Atoms are rearranged to form new substances

Atoms disappear completely

Atoms multiply to create more mass

3. The law of conservation of mass states that:

Mass increases during chemical reactions

Mass is neither created nor destroyed in chemical reactions

Mass decreases when gases are produced

Mass only matters in physical changes

📊 Part 2: Investigation Data Recording

4. Complete the data table below for your three chemical reactions:

Reaction 1: Metal + Acid

Reactants: _________________ + _________________

Temperature before: _____°C Temperature after: _____°C

Observations: ________________________________________________

Reaction 2: Baking Soda + Vinegar

Reactants: _________________ + _________________

Temperature before: _____°C Temperature after: _____°C

Observations: ________________________________________________

Reaction 3: Starch + Iodine Solution

Reactants: _________________ + _________________

Temperature before: _____°C Temperature after: _____°C

Observations: ________________________________________________

5. Write word equations for each reaction:

Reaction 1: _________________ + _________________ → _________________ + _________________

Reaction 2: _________________ + _________________ → _________________ + _________________

Reaction 3: _________________ + _________________ → _________________ + _________________

🔬 Part 3: Analysis and Evaluation

6. For each reaction, identify which indicators showed that a chemical change had occurred:

7. Explain how the law of conservation of mass applied to your experiments. Use the concept of atom rearrangement in your answer:

8. Which reaction produced the most obvious signs of chemical change? Justify your answer with specific observations:

9. Extension: Suggest one way you could modify each experiment to investigate how reaction rate is affected by changing conditions (e.g., temperature, concentration):

10. Evaluate the success of your investigation. What worked well and what could be improved for more accurate results?

Chemical Reactions Investigation

Chemical Reactions Investigation

🧪 Part 1: Pre-Investigation Knowledge

📊 Part 2: Investigation Data Recording

🔬 Part 3: Analysis and Evaluation

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