Which type of rock contains minerals arranged in crystals and forms when molten rock cools and turns solid?
a. metamorphic rock
b. fossilized rock
c. igneous rock
d. sedimentary rock

If you put a helium-filled balloon in the refrigerator, what will happen?

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory