Which of the following indicates that a chemicl change has taken place?

(a) a change from liquid to a gas
(b) an increase in the volume of a substance
(c) a change in the color of a substance
(d) a change from a solid to a liquid

a precipitate is a gas formed from the chemical of two substance.

(a)true
(b)false

which of the following is a chemical change?

(a) melting ice
(b) boiling water
(c) a burning candle
(d) frost forming inside a freezer

Luke and carrie are driving down a straight section of the interstate at 70 mph in luke's new convertible. carrie is drinking a soda in the passenger seat. when she is done she tosses the bottle straight up in the air, just above the height of the car. what will happen to the bottle if air resistance is neglected? a. the bottle will land in carrie's lap. b. not enough information is given. c. the bottle will land on the interstate in front of the car. d. the bottle will land on the interstate behind the car.

Describe the path of a ray that approaches a mirror parallel to the principal axis.

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?