Hypotheses on Matter Changes

Name:

Date:

🔬 Part 1: Understanding Hypotheses

What is a hypothesis? A hypothesis is your educated guess about what you think will happen in an experiment and why you think it will happen. It's like making a prediction based on what you already know!

Hypothesis sentence stem: "If _____________, then _____________, because _____________."

1. Circle the best definition of a hypothesis:

A wild guess about anything

An educated prediction that can be tested

The final answer to an experiment

A type of scientific equipment

2. Complete this hypothesis about ice: "If I place ice cubes in a warm room, then _____________, because _____________."

🧊 Part 2: Investigation Planning

Scenario: You have been asked to investigate what happens when you heat water to different temperatures: 20°C (room temperature), 50°C (warm), and 80°C (hot).

3. Write your hypothesis using the sentence stem:

If I heat water to higher temperatures, then _____________, because _____________.

4. Identify the variables in this investigation:

Independent variable (what you change): _________________________

Dependent variable (what you measure): _________________________

Controlled variables (what stays the same): _________________________

5. Create a results table for your investigation:

📊 Part 3: Results and Conclusions

6. After completing your investigation, tick what you observed:

Water stayed the same at all temperatures

Water began to bubble at higher temperatures

Steam appeared at 80°C

Water disappeared completely

7. Compare your hypothesis with your results. Was your hypothesis correct? Explain:

8. What did you learn about how heating changes matter? Write a conclusion:

9. If you could repeat this investigation, what would you change or improve?

📝 Teacher Guidance

Sample answers: Q2: "they will melt, heat causes ice to change from solid to liquid"; Q3: "it will heat up and eventually boil, adding energy makes water molecules move faster"; Q4: Independent - temperature, Dependent - state of water/observations, Controlled - amount of water, container type, time observed; Q7: Students should compare prediction with actual observations of water heating and steam formation.