What type of substance is a catalyst?

A. always a gas

B. always a liquid

C. always a powder

D. A catalyst can be in many forms.

Choose all of the statements that are true about electromagnets: 1. Electromagnets are permanent and always have a magnetic field around them. 2. electromagnets can be made stronger by adding more coils to the solenoid. 3.

The visible light spectrum ranges between A. radar waves and X-rays. B. ultraviolet rays and gamma rays. C. infrared rays and ultraviolet rays. D. television waves and infrared rays.

When a smooth flowing stream of water comes out of a faucet it narrows as it falls. Explain why this happens.

Which describes the molecular motion of a solid nickel marble rolled across the floor? A. the constant vibration of the nickel atoms that make up the marble B. the motion of the nickel atoms due to contact with the floor C.

2 ways radio waves and gamma waves are alike

Why can radio telescopes be used 24 hours a day?

How do you find mass, volume and density? Any formulas?

Explain the difference between texture and composition.

Marie and Calvin dissolved 10 grams of KNO3 in 100 grams of water at 25oC. Next they added 5 grams more.

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. It strikes a red glider that has mass 0.600 kg and that is initially at rest.