Title: Investigating Changes of State of Matter

Objective: To observe and record changes of state of matter and identify the factors that affect these changes.

Materials: - Ice cubes - Water - Heat source (stove or hot plate) - Thermometer - Glass beaker - Metal spoon - Stopwatch or timer

Procedure:

1. Fill a glass beaker with water and place it on a heat source.
2. Insert a thermometer into the water and record the initial temperature.
3. Heat the water until it reaches boiling point (100°C) and record the time it takes to reach this temperature.
4. Once the water is boiling, use a metal spoon to carefully add an ice cube to the beaker.
5. Observe and record any changes that occur in the water and the ice cube.
6. Continue to observe the beaker until the ice cube has completely melted and record the time it takes for this to happen.
7. Remove the beaker from the heat source and allow it to cool down to room temperature.
8. Observe and record any changes that occur in the water as it cools down.
9. Repeat the experiment using different amounts of water, ice cubes, and heat sources (if available).

Results:

• When the ice cube is added to the boiling water, it immediately starts to melt and the water temperature decreases.
• As the ice cube melts, the water temperature remains constant at 0°C until all the ice has melted.
• Once the ice has melted, the water temperature starts to increase again.
• When the beaker is removed from the heat source, the water temperature starts to decrease until it reaches room temperature.

Conclusion:

This experiment demonstrates the changes of state of matter that occur when ice is added to boiling water. The ice melts and changes from a solid to a liquid, while the water changes from a liquid to a gas as it boils. The temperature of the water also changes throughout the experiment, depending on the state of matter it is in. The experiment also shows that the amount of water, ice, and heat source used can affect the time it takes for the changes of state to occur.