In the reaction HF + Al AlF3 + H2, which two substances would have a coefficient of 2 if the reaction were balanced?

Check all that apply.

A. H2

B. Al

C. AlF3

D. HF

What are glacial episodes example of

A ball is dropped from the top of a building. When does the ball have the most potential energy?

A record turntable is rotating at 33 rev/min. A watermelon seed is on the turntable 4.4 cm from the axis of rotation. (a) Calculate the acceleration of the seed, assuming that it does not slip.

The energy stored in oil come from the sun. Describe how energy from the sun became stored in oil

An MP3 player draws a current of 0.120 ampere from a 3.00-volt battery. What is the total charge that passes through the player in 900. seconds? (1) 324 C (3) 5.40 C (2) 108 C (4) 1.80 C

Archimedes tells us the lifting power of a balloon (how much mass it can lift) is equal to the difference between the mass of the balloon and the mass of the air it displaces.

What are the parts of a pendulum? Describe each part.

Why do space suits need to be pressurized?

Why do comets have tails?

The main characteristic of all vertebrates is the presence of a. cartilage b. a large brain c. a backbone d. an exoskeleton I got it. The answer was B