According to the law of conservation of matter, which statement about chemical reactions is true?

atoms are created by some reactions and destroyed by others.

energy is created as atoms are destroyed in chemical reactions.

atoms cannot be created or destroyed by chemical reactions.

every atom destroyed in a chemical reaction must be replaced

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

An owl dives toward the ground with a constant velocity of 4.40 m/s at 53.0° below the horizontal. the sun is directly overhead and casts a shadow of the owl directly below it. what is the speed (in m/s) of its shadow on level ground?