Chem Ch 8

Question 1

Oxidation numbers, what are they?

Answer 1

+ or – charges on one atom or a group of atoms (Polyatomic ions)

Question 2

Give two examples of an element or polyatomic ion with its oxidation number

Answer 2

Cl - Na + SO4^2-

Question 3

Greek prefixes – what do they tell us?

Answer 3

How many of something there is

Question 4

List the prefixes in order from 1 through 9

Answer 4

Mono, di, tri, tetra, penta, hexa, hepta, octa, nona

Question 5

What does binary mean?

Answer 5

2 parts

Question 6

What does ionic mean

Answer 6

Atom loses electron to the other when they bond

Question 7

What is a cation

Answer 7

Positive ion

Question 8

Which part of the formula would you see the cation

Answer 8

Positive ion

Question 9

LiH Which is cation

Answer 9

Li

Question 10

magnesium acetate formula

Answer 10

Mg(C2H3O2)2

Question 11

Why the parentheses?

Answer 11

GROUP OF ATOMS TOGETHER IN A SPECIFIC WAY = POLYATOMIC IONS

Question 12

Iron (III) chloride and Iron (II) chloride: give their formula

Answer 12

Iron (III) chloride = FeCl3
Iron (II) chloride = FeCl2

Question 13

What is the difference between Iron (II) and Iron (III)?

Answer 13

+2 versus a +3 charge (oxidation number)

Question 14

The numbers we see in some formula names like I, II, III, IV, V VI are all examples of what type of numerals?

Answer 14

Roman

Question 15

What is the Stock system of naming compounds? Give examples

Answer 15

Iron (II) Oxide = FeO
Iron (III) Oxide = Fe2O3
Copper (I) Fluoride = CuF

Question 16

Why is it important to balance the + and – charges of ions in a formula?

Answer 16

Balances to zero which is neutral and less likely to react

Question 17

Water can and does attach itself to the crystalline structure of a molecule. What is the water called?

Answer 17

Hydrate

Question 18

What do we call a compound that has no water in the molecule

Answer 18

Anhydrous

Question 19

MgSO4 * 3H2O

Answer 19

Magnesium Sulfate Trihydrate

Question 20

Chemical formula for sodium cyanide

Answer 20

NaCN

Question 21

Chemical formula for calcium fluoride

Answer 21

CaF2

Question 22

P2O5

Answer 22

Diphosphorus Pentoxide

Question 23

N3O5

Answer 23

Trinitrogen Pentoxide

Question 24

The symbol ——–> in an equation means

Answer 24

Yields or this will result in

Question 25

What reaction is 4Fe + 3O2 ------> 2Fe2O3

Answer 25

Synthesis

Question 26

What reaction is 2AlCl3 ------> 2Al + 3Cl2

Answer 26

Decomposition

Question 27

What reaction is TiCl4 + 4N ----> Ti + 4NaCl

Answer 27

Single replacement

Question 28

What reaction is 2NaCl + H2SO4 --------> Na2SO4

Answer 28

Double replacement

Question 29

When we say that HF is in the gas form in a chemical equation, how do we represent this?

Answer 29

HF (g)

Question 30

You have a beaker full of the solution of stomach acid (KCl). How do we show it as a solution in a chemical reaction?

Answer 30

KCl (aq)

Question 31

When you see an equation A+B -> <- AB, what does the -> <- tell us about the equation?

Answer 31

The equation goes forward and backward

Question 32

The catalyst helps doing what in a chemical reaction?

Answer 32

Speeds up a reaction while its unchanged

Question 33

What symbol do we use when a precipitate forms because of a chemical reaction?

Answer 33

arrow pointing down

Question 34

We use the symbol (triangle) to tell us

Answer 34

Heat was added to get the reaction going

Question 35

When would a decomposition reaction take place in the real world

Answer 35

Digesting food in the stomach, burning a marshmallow, food being spoiled