University:
Eastern Kentucky University
Course:
PHY 131 | College Physics I
Academic year:

2020
Views:

338

Pages:

1
Author:

Oerallerxhcq

Name: Answer Key Phases of Matter 2. 1. List the three phases of matter. i) Solid ii) Liquid iii) Gas 2. What is needed to change the phase of matter? Adding or subtracting energy 3. What happens to the molecules of a compound when it changes state from liquid to solid? The molecules lose energy and as a result, slow down and become closer together. 4. How does a refrigerator cool food and drinks? A refrigerator removes energy from the system, which in turn, removes energy from the food. 5. How is steam different from water vapour? You can see steam but not water vapour. 6. What is absolute zero? -273°C or 0°K 7. molecules have zero movement. Can scientists cool matter to absolute zero? Explain your answer. No, there is always some energy transfer between the inside and outside of the container. 8. Explain the shape of: a) gases – takes on the volume and shape of the container. b) liquids – has a constant volume but takes the shape of the container. c) solids – has a definite shape and volume which don’t change.