Which is the best description of a molecule?
a molecule of an element is composed of at least two types of atoms.
amolecule of a compound is composed of only one type of atom.
a molecule of a compould is composed of at least two types of atoms.
a molecule of an element is composed of exactly two types of atoms.

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?