🔬 Part 1: Understanding Changes

1. What is a physical change?

A change that creates a completely new substance

A change in shape, size, or state without making a new substance

A change that cannot be reversed

A change that always produces gas bubbles

2. Which of the following are examples of chemical changes? (Tick all that apply)

Melting ice cubes

Mixing baking soda and vinegar

Tearing paper into pieces

Burning wood in a fireplace

Dissolving salt in water

Rusting of a bicycle chain

3. When you dissolve salt in water, what type of change occurs?

Physical change

Chemical change

Both physical and chemical

Neither physical nor chemical

4. Fill in the blanks:

In a _____________ change, the substance remains the same but its appearance changes. In a _____________ change, a new substance is formed that has different properties from the original.

📝 Part 2: Experiment Observations

5. Describe what you observed when ice cubes were heated. Use scientific vocabulary in your answer.

6. What happened when baking soda and vinegar were mixed together? List three observations.

a) _________________________________________________

b) _________________________________________________

c) _________________________________________________

7. Explain why the baking soda and vinegar experiment is considered a chemical change. Give evidence from your observations.

8. Can the changes you observed be easily reversed? Explain your reasoning for both the melting ice and the baking soda-vinegar reaction.

🧠 Part 3: Apply Your Knowledge

9. Predict what type of change would occur if you tried to melt a chocolate cake. Explain your prediction.

10. Give two examples from everyday life of each type of change:

Physical Changes:

1. _________________________________________________

2. _________________________________________________

Chemical Changes:

1. _________________________________________________

2. _________________________________________________

Physical and Chemical Changes

Physical and Chemical Changes

🔬 Part 1: Understanding Changes

📝 Part 2: Experiment Observations

🧠 Part 3: Apply Your Knowledge

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