Chapter 2

Question 1

Element

Answer 1

Any substance that cannot be broken down to any other substance by chemical reactions

Question 2

Compound

Answer 2

A substance consisting of two or more different elements combined in a fixed ratio.

Question 3

Matter

Answer 3

Anything that takes up space and has mass

Question 4

Isotope

Answer 4

One of several atomic forms of an element, each with the same number of protons but a different number of neutrons, thus differing in atomic mass

Question 5

Valence Electron

Answer 5

An electron in the outermost electron shell

Question 6

Valence Shell

Answer 6

The outermost energy shell of an atom, containing the valence electrons involved in the chemical reactions of that atom

Question 7

van der Waals interactions

Answer 7

Weak attractions between molecules or parts of molecules that result from transient local partial charges

Question 8

Ionic Bond

Answer 8

A chemical bond resulting from the attraction between oppositely charged ions

Question 9

Chemical Equilibrium

Answer 9

In a chemical reaction, the state in which the rate of the forward reaction equals the rate of the reverse reaction, so that the relative concentrations of the reactants and products do not change with time