Which of the following is a definite indicator of a chemical change?

A.

The shape of a substance is changed.

B.

A new substance is formed.

C.

A substance is converted from a liquid to a gas.

D.

The change in a substance is reversible.

Which of the following statements is true? A.) All of the sun's heat is reflected by the Earth's atmosphere. B.) Radiation is the transfer of heat between objects which are not touching. C.

In what kind of wave are waves perpendicular to the direction of the wave motion

A 4.0-kg ball has a momentum of 20.0 kg-m/s. What is the ball's speed?

calorimeter has aluminum inner cup of mass 120 gram containing 100 ml water at temperature 20 degree Celsius. Brass piece with mass 100 gram is heated to 100 degree Celsius, and then immersed in the calorimeter.

In science what is the ability to cause change or do work

Which of the following is an example of convection? A. hot air rising and cooler air falling B. a hot object transferring heat to a cooler one C. a hot oven warming the air around it D. the rays of the Sun warming the earth

A 50,000 kg locomotive is traveling at 10 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? Assume the track is level.

A rectangular loop of wire with sides 0.262 and 0.401 m lies in a plane perpendicular to a constant magnetic field (see part a of the drawing). The magnetic field has a magnitude of 0.

In the system you're inspecting the damper motor isn't working, You decide to see if the damper-postion sensor us sending the proper signal to the which then signals the damper motor. A. heating coil B. duckwork c. energy source D. controller

Which of the following statements does not describe the structure of an atom? a. An atom has a small, dense center called the nucleus. b. Inside the nucleus of an atom are protons and electrons. c. Protons are positively charged sub-atomic particles.