🧪 Part 1: Safety First

1. Check all the safety rules we must follow during our chemical reactions lab:

Wear safety goggles

No tasting any substances

Mix substances gently

Clean up spills immediately

Work cooperatively in groups

2. What are the three main signs that tell us a chemical reaction is happening?

🔬 Part 2: Observation Recording

3. Record your observations for each mixture:

Experiment 1: Baking Soda + Vinegar

What I observed:

Evidence of reaction (tick all that apply):

Colour change

Bubbles/fizzing

Temperature change

No reaction

Experiment 2: Lemon Juice + Baking Powder

What I observed:

Evidence of reaction (tick all that apply):

Colour change

Bubbles/fizzing

Temperature change

No reaction

Experiment 3: Water + Food Colouring

What I observed:

Evidence of reaction (tick all that apply):

Colour change

Bubbles/fizzing

Temperature change

No reaction

📊 Part 3: Classification and Analysis

4. Match each type of reaction with its correct description:

1. Gas Production

2. Colour Change

3. Temperature Change

A. The mixture feels warmer or cooler

B. Bubbles or fizzing occurs

C. The mixture turns a different colour

5. Which experiment showed the MOST evidence of a chemical reaction? Circle your answer:

Baking soda + vinegar

Lemon juice + baking powder

Water + food colouring

6. Explain why you chose that experiment:

🧠 Part 4: Scientific Thinking

7. Fill in the blanks using the words from the box:

Word Bank: chemical, evidence, particles, irreversible, materials

When we mix substances together, we can sometimes create a __________ reaction. This happens when __________ change and combine in new ways. We can find __________ of these reactions by looking for colour changes, gas production, or temperature changes. Many chemical reactions are __________, which means we cannot easily change the __________ back to how they were before.

8. Draw a picture showing what happened when baking soda and vinegar were mixed:

9. Why do you think it's important to study chemical reactions? Give two reasons:

10. True or False: Circle the correct answer for each statement:

a) All mixtures create chemical reactions.

True

False

b) Bubbling is always a sign of a chemical reaction.

True

False

c) We should always wear safety goggles during experiments.

True

False