Question

Help me on these pleaseeeee

1. Read the excerpt from a reading passage titled "Matter and Energy: Evaporation and Condensation."

Condensation
An example of condensation can be seen when drops of water form on the outside of a glass of ice water. The drops seem to appear from nowhere, but they actually form from water vapor in the air. The dew that forms on grass overnight is another example of condensation.

Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy. As a result they slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.

(Source: Encyclopaedia Britannica, adapted by Newsela staff, 06/02/2017)


Describe the process of how dew forms on a blade of grass.




Question 10 options:

Dew forms on grass when water vapor forms when molecules cool and separate.


Dew forms on grass when water vapor forms when liquid cools and becomes a gas.


Dew forms on grass as water vapor warms up on blades of grass overnight.


Dew forms on grass when water vapor forms when molecules cool and join together.




2. Read the following lab report from a chemistry experiment. Determine their hypothesis.

We wanted to know how temperature affected the volume of a gas. We investigated this by filling a balloon with air and heating and cooling it, comparing the circumference of the balloon before and after. Our results showed the balloon got bigger when heated and smaller when cooled. These results support our hypothesis.

Question 12 options:

Gases contract when heated and expand when cooled.


The gas temperature will not impact the circumference of the balloon.


Gases expand when heated and contract when cooled.


Volume and temperature are not related.

Answer 1

A Dew forms on grass when water vapor forms when molecules cool and join together.

B Gases expand when heated and contract when cooled.