Which describes how chemical changes are different from physical changes? (a) Chemical changes can be measured, but physical changes cannot. (b)Chemical changes involve the formation of a new substance. (c)Chemical changes release energy, but physical changes absorb energy.
(d) Chemical changes cannot be caused by oxygen.

What are the necessary conditions for fusion?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.