chemistry unit test

Question 1

how is the valence charge of an atom’s ion determined

Answer 1

The valence charge of an ion is determined by how many electrons are needed to be added or removed to have a full orbit and to become stable

Question 2

what are two differences between molecular an ionic compound

Answer 2

• molecular is one metal/one nonmetal
• ionic is two nonmetals
• ionic conducts heat, molecular doesn’t

Question 3

what does (aq) mean

Answer 3

aqueous. It means dissolved in water.

Question 4

all acids contain what type of ion

Answer 4

hydrogen. H+

Question 5

all bases contain what type of ion

Answer 5

hydroxide

Question 6

when an acid and a base react, what to products are always produced? And what type of reaction is this?

Answer 6

water and salt. Double displacement/neutralization.

Question 7

what does balancing chemical equations have to do with the law of conservation of mass?

Answer 7

you can’t create or destroy matter. whatever is present on the left must be there on the right. you balance equations in order to convey the law of conservation of mass. you have to balance to obey the law.

Question 8

Carbon dioxide

Answer 8

CO2

Question 9

what is a polyatomic ion

Answer 9

two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit.

Question 10

2 types of acids

Answer 10

binary and oxy-acid

Question 11

binary acid

Answer 11

contains hydrogen and one other element only.

only use hydro for binary acids. (not polyatomic)

Question 12

oxy-acids

Answer 12

contains hydrogen and a polyatomic ion
no hydro

ATE = IC
ITE = OUS

Question 13

ATE
ITE
PER ATE
HYPO ITE

Answer 13

ATE = 3
ITE = subtract 1 from ate (2)
PER ATE = add one from ate (4)
HYPO ITE = subtract 2 from ate (1)

Question 14

how many electrons does each orbit level hold

Answer 14

The first orbit holds two electrons, then every other orbit after that holds electrons