Which statement describes an electron?
a: it has a positive charge and is located in the nucleus.
b: it has a positive charge and is located in orbitals around the nucleus.
c: it has a negative charge and is located in the nucleus.
d: it has a negative charge and is located in orbitals around the nucleus.

Which compounds have the empirical formula ch2o? a.c2h4o2 b.c3h6o3 c.ch2o2 d.c5h10o5 e.c6h12o6

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.

Which of the following units is not an official si unit? mole liter kilogram ampere