What happens when the temperature of a substance decreases significantly?

A.

Most substances will expand.

B.

Most substances will gain atoms.

C.

Most substances will disappear.

D.

Most substances will contract.

Which of the following is accurate in describing the placement and classification of iodine? a. iodine is located in period 5, group 17 and is classified as a nonmetal. b. iodine is located in period 17, group 5 and is classified as a nonmetal. c.

The slope of a position-time graph of an object gives the speed of the object. True False

How is light energy different from both sound and heat energy?

Hurry hurry! which type of friction acts on an object that is not moving? a. static friction b. fluid friction c. sliding frictiond. rolling friction

What is meant by focal length?

Which of the following has the least impact on the environment? A. solar power B. nuclear power C. fossil fuels D. hydroelectric power

Why is steel better to conduct sound than air? use the words density and compression in your answer

4. How does density affect refraction of a lightwave?

Kinetic friction is affected by the weight of the object. TrueFalse

How is the temperature related to the speed of the particles