Which is an indication that a chemical change to a substance has occurred?

A.

It changes shape.

B.

New substances are formed.

C.

Energy is used or given off.

D.

both B and C

How do we calculate the "range" of the measurements? a) subtract the smallest value from the largest value b) subtract the largest value from the smallest value c) add up all the measurements d) add up all the measurements and divide by the number

Chemical sediments that result from the evaporation of water are

A 2.0-kg block is on a perfectly smooth (frictionless) ramp that makes an angle of 30^/circ30 ∘ with the horizontal. What is the force of the ramp on the block?

When you turn the faucet on in the morning, where does that water come from?

What is the result of (6.2*10 4) * (3.3*10 2) expressed in scientific notation?

A 500 lb steel beam is lifted up by a crane to a height of 100 ft and is held there. A) How much work is being done to hold the beam in place? B) How much work was done to lift the beam?

If Light is shone through the slits of a card onto a sheet of white paper describe what is seen.

When you break a magnet in half, how many poles does each piece have? Explain.

What can you use to unscrew a tiny screw?

What shoreline feature would develop if the global sea level were to rise considerably