A compound is: A. Two or more elements that are mixed together but not chemically bonded. B. A pure chemical substance consisting of one type of atom. C. None of these. D. Two or more elements that react and form bonds with each other.

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units:

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

Enzymes affect the reactions in living cells by changing the