Which is an indication that a chemical change to a substance has occurred?

A.

It changes shape.

B.

New substances are formed.

C.

Energy is used or given off.

D.

both B and C

In which of the following situations must a driver yield to a pedestrian?

What should police remove to study the physical conditions of a gun homicide case? the victims clothes any valuables from the victim (wallet, jewelry) the victims cell phone the victims dentures, if they wear any

Describe the role of a generator in producing electricity. The generator transforms the mechanical energy of the turbine into electrical energy. The generator spins the turbine to create mechanical energy.

Which is an example of a transverse wave? A. sound B. electromagnetic C. water D. seismic waves

Which type of solute is least likely to dissolve in water a. ionic b. polar c. nonpolar d. alcohol

To determine waves frequency you must know the what

What is the average speed in miles per hour of the car that traveled a total of 200 miles in 5.5 hours

A solid weighs 277.5 g in air and 212.5 g when totally immersed in the liquid of density 0.9 g / cc. Calculate the density of the solid.

Who first described the double-helix structure of DNA?

Suppose you are holding a basketball while standing still on a skateboard you are and the skateboard have a mass of 50 kg you throw the basketball with a force of 10 N what is your acceleration before and after you throw the ball