Question

Procedure:

1. Pour about 100 mL of water into a container/pot.

2. Place the container/pot on a stove and heat it for about a minute. Notice also if the water is already boiling or not.

3. Then, carefully touch the side of the container/pot (be very careful in touching the container/pot). Record your observation.

4. Next, place an ice into water. What do you observe? Record your observation.

5. Put water in a glass and pour 1 teaspoon of salt. Which substances flows on top? Record your observation.

6. Using the different solid substances (available at home) dissolve each in a glass of water with one teaspoon each. Observe what happens. Record your observation.

Guide Questions:

1. Observation about solubility of salt. Which substances flows on top? (Observation in Procedure 5)

2. Observation about the density of the different solid substances (available at home). (Observation in Procedure 6)

Answer 1

The water is starting to boil

The pot is hot and you feel a sharp pain while touching the pot

The ice begins to melt and turn into water and vapour begins to come out of the container top

Salt in water makes a denser solution

The material either floats or sinks in the water

Salt water is more denser than freshwater

The density of different materials depend on the material itself