Basic Chemistry and Properties of Water

Which subatomic particle contributes almost no weight to an atom?

• protons

• neutrons

• electrons

• ions

The atomic number tells you the

• number of neutrons in the nucleus

• number of protons in the atom

• number of electrons if the atom is neutral

• number of protons and electrons

If an atom has 2 e- in it's outer shell (like Mg), would most likely

• share to acquire a completed shell

• lose these 2 e- and become a negatively charged ion

• lose these 2 e- and become a positively charged ion

• bond with another Mg atom to complete it's outer shell

Isotopes differ in their

• number of protons

• atomic number

• number of neutrons

• number of electrons

When an atom gains e-, it

• forms a negatively charged ion

• forms a positively charged ion

• gains atomic mass

• forms covalent bonds

In methane,

• all atoms have 8 e- in their outer shell

• all atoms are sharing e-

• carbon could accept more hydrogen

• all are correct

Water is a good solvent because of it's

• hydrogen bonding

• cohesiveness

• ionic bonding

• polarity

When a solution goes from a pH of 5 to 3,

• there are 100x as many hydroxide ions

• there are 2x as many hydroxide ions

• there are 100x fewer hydroxide ions

• there are 2x fewer hyroxide ions

If a chemical accepted hydrogen ions from a solution it would be

• an acid

• a base

What is the pH of a solution that contains 1 x 10^-9 hydrogen ions?

• 9

• 1

• 5