1. 1:3 INVESTIGATE THE MOTION OF PARTICLES

2. 1.What is temperature When we measure an object's temperature, we measure the __________ of the particles in the object. a.Average kinetic energy b.Potential energy c.Heat

3. 2. What happens to the speed of particles as they increase in heat? A. move faster B. move slower Heat is energy that makes particles move faster.

4. 3. What is molecular motion? A. increases B. decreases 1.Heating a substance _______ molecular motion. 2. Cooling a substance _______ molecular motion. 3. As molecular motion _______, the space between molecules increases. 4. As molecular motion decreases, the space between molecules ________.

5. 4. What happens to particles in diffusion? What causes diffusion? a.Move from low to high concentration. b.Move from high to low concentration.

6. 5. Which of the following particles diffuse and which do not diffuse? A. B. C. Diffusion is almost impossible in solids because the particles are too closely packed and strongly held together with no ‘empty space’ for particles to move through.

7. 6. Why does diffusion happen faster in warmer substances than in colder ones? a.Cold b.Warm c.Hot

8. 7. Why does matter expand and contract as it heats up and cools down?

9. 8. Why do builders have to consider expansion and contraction of particles when building structures such as bridges and railroads?