Question

1. Stir a spoonful of sand into a half a cup of warm water. What happens to the sand? Record your observations.

2. In another cup, stir a spoonful of salt into a half a cup of warm water. What happens to the salt? Record your observations.

3. Stick the straw into the salt water mixture. Take a small sip. What does it taste like? What does this prove about the salt?

4. Look at the sand mixture and the salt mixture. How are the mixtures different? Record your observations. Do you think the mixtures can be separated?

5. Place a coffee filter over one of the empty cups. Carefully and slowly pour the sand mixture into the filter. Record your observations. What happens to the water and the sand?

6. Try the same filtering method with the sand water. What happened? Taste the “filtered” salt water again with a straw. What do you notice about the taste?

7. Pour a small amount of salt water into another cup. Set it on a windowsill and observe it every day for a few days. Record your observations. After the water is gone, what is left behind?

Answer 1

Answer:

1. nothing will happen because it is insoluble

2 in hot water salt gets dissolved in it

4.when I saw the mixtures of both sand

Answer 2

1. Stir a spoonful of sand into a half a cup of warm water.

Observation: The sand did not dissolve in water.

2. In another cup, stir a spoonful of salt into a half a cup of warm water.

observations: The salt dissolved in water.

3. Stick the straw into the salt water mixture. Take a small sip.

Observation: It tastes like salty water. This proves that the salt completely dissolved in water.

4. Look at the sand mixture and the salt mixture.

Observation: The salt and sand mixtures are different. The sand settled down in water but the salt dissolved in water.They can be separated.

5. Place a coffee filter over one of the empty cups. Carefully and slowly pour the sand mixture into the filter.

Observation: The sand settled down in water and when we filter it we will get the sand and water separately.

6. Try the same filtering method with the salt water.

The salt will be collected in the filter.

Taste the “filtered” salt water again with a straw.

The filtered salt water does not taste salty like previous one.

7. Pour a small amount of salt water into another cup. Set it on a windowsill and observe it every day for a few days.

After some days the water will evaporate and the salt will left behind.