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

Each time the heart beats, what does it do to the blood

What are the cells in your body

if my weight is 53.18 kg and i walked up a flight of stairs 4.3 meters tall in 11.35 seconds what would be the work it took me to climb up the stairs in joules?

GAMMA RAYS What are some applications of gamma rays? In other words, what can we use them for?

A motorbike accelerates from rest at 12m/s in 3s on a level road. If the force is 3000n what is the total mass of the cyclist and the motorbike?

Your university radio stawon has a 5.0-kw radio transmixer that broadcasts uniformly in all direcwons; listeners within 15 km have reliable recepwon. you want to increase the power to double that range. what should be the new power?

A projectile is thrown upward so that its distance above the ground after t seconds is h (t) equals negative 16 t squared plus 704 t. a) Find the maximum height the object reaches. b) Find the time it takes the object to reach the ground.

Whats an example of projectile motion

The fact that the sun rises and sets at different times during the day depending on the time of year is an example of a data trend. True or False

What sample of matter is a single substance