A substance that accelerates the rate of a chemical reaction is called a (an)

a. catalyst.

c. molecule.

b. lipid.

d. element.

What must happen for liquid water to become water vapor

Which of these have an elliptical orbit around the sun? A. Earth B. Jupiter C. Mars D. All of the above

A machine performs 90 J of work in lifting an object. It requires 120 J of work do lift it. How much heat is created by the machine?

The mass of an object is independent of its location. true or false

I'm new to brainy, but here is my question. Andre, whose mass is 77.1 kg, sits on a diving board above a dunk tank. If he is sitting 0.90 m above the water, what is his total mechanical energy?

A fast, white water cascade is also known as what?

What is a stack of membranes that packages chemicals

Under what condition (s) will an object be in equilibrium? Notice that equilibrium in physics has a broader definition. (A) Only if it is moving with constant velocity. (B) Only if it is at rest.

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly