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13 February, 15:57

Science questions (30 pts)

At 200 degrees F, substance 1 is a liquid, substance 2 is a solid, and substance 3 is a gas. Which substance has molecules with no kinetic energy?

Substance 1

Substance 2

Substance 3

None

Chemical A and Chemical B are mixed to make a new substance. The substance has a color different than either of the original chemicals. This would be an example of a ...

chemical change.

physical change.

Which is true about a block of ice in a closed container where the temperature is increasing but the pressure stays the same?

The water molecules will slow down.

The water molecules will have an increase in kinetic energy

The atoms in each water molecule will separate

The water molecules making up the ice undergo a chemical change

Which is an endothermic phase change?

melting

freezing

condensation

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Answers (1)
  1. 13 February, 17:56
    0
    The first one is solids since they have no kinetic energy

    The second one is chemical since the change of colors shows that there is about to be a chemical change

    The third one is C

    The Endothermic process definitely fits melting
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