Which will speed up a chemical reaction?

A.

Apply heat.

B.

Increase the concentration of the reactants.

C.

Grind up the substance, so there is more surface area.

D.

all of the above

Given the distance between the crest of one wave and the crest if the next wave, you can determine the?

A 0.108-kg block is suspended from a spring. When a small pebble of mass 31 g is placed on the block, the spring stretches an additional 4.9 cm. With the pebble on the block, the block oscillates with an amplitude of 10 cm.

Put the following terms in order from greatest intermolecular forces, to weakest intermolecular forces: liquid, gas, solid.

Carl and Mike start a 3 mile race at the same time. If Mike ran the race at 6 miles per hour and finishes the race 10 minutes before Carl, how fast does Carl run?

Nick pulls into a gas station and fills up his tank. He then starts his car, turns on his headlights, and drives away. Beginning with the gasoline, list and explain the energy conversions taking place as he drives away.

What happens to the total mechnical energy of the apple as it falls from the tree?

Fair Bonus Question: Derive the equation for gravitational potential energy, starting with the definition of work.

A juggler throws a bowling pin into the air with an initial velocity. Another juggler drops a pin at the same instant.

The liquid electrolyte in the battery typically takes what kind of net charge? a. positive b. negative c. neutral

Relating to Newton's Third Law, action and reaction, what is the reaction when a rocket expels gas, smoke and flames from the nozzle end of the rocket engine?