What are some indicators that a chemical reaction is occurring? Check all that apply.

the formation of bubbles

a change in size

a change in color

the formation of a liquid

the formation of a precipitate

Suppose you exert a 400-N force on a wall but the wall does not move. The work you are doing on the wall is : unknown, because the mass of the wall is not given zero, because the wall is not moving 3920 J 400 J

Simplify completely: - 3 (4-9) + 6-2 (-8+5)

Where is the steering nozzle located on a pwc?

What's the degree to which molecules are able to pass through a membrane

How is ph used to determine if a solution is acidic or basic?

A pulley system used to lift car tires has a mechanical advantage of 8.1. If you pull on the pulley with a force of 540 N, how much force does the pulley exert on the tire?

An object of mass 1000 kg, initially having a velocity of 100 m/s, decelerates to a final velocity of 20 m/s. what is the change in kinetic energy of the object, in kj?

Find the momentum of a 25 kg object going 4m/s to the right.

In the following diagram, the clockwise torque is equal to ___.

A stone was dropped off a cliff and hit the ground with a speed of 112 ft/s. what is the height of the cliff? (use 32 ft/s2 for the acceleration due to gravity.) ft ft