Formulas+convertions

Question 1

Number of particles or number of moles

Answer 1

n=N/NA

Question 2

What is avagadros number

Answer 2

6.02 x 10 ^23

Question 3

Concentration unit

Answer 3

g/dm3
(g/dm3 = mol/dm3 x Mr)

Question 4

Concentration formula

Answer 4

c=n/V

Question 5

Convection from cm3->dm3

Answer 5

Divide by 1000

Question 6

Volume of a gas

Answer 6

n=V/24

Question 7

Room temperature and pressure

Answer 7

25`C and 1 atm

Question 8

Charge of:
Zn
Pb
Ag

Answer 8

2+
2+
+

Question 9

Ammonium formula

Answer 9

NH4 +

Question 10

Hydroxide formula

Answer 10

OH-

Question 11

Nitrate formula

Answer 11

NO3 -

Question 12

Sulfate formula

Answer 12

SO4 2-

Question 13

Carbonate formula

Answer 13

CO3 2-

Question 14

Hydrogen carbonate formula

Answer 14

HCO3-

Question 15

Phosphate formula

Answer 15

PO4 3-

Question 16

Thiosulfate formula

Answer 16

S2O3 2-

Question 17

Methane formula

Answer 17

CH4

Question 18

Ammonia formula

Answer 18

NH3

Question 19

Percentage yield formula

Answer 19

Actual yield/theoretical yield x 100

Question 20

Volume of a gas formula

Answer 20

V=n x 24

Question 21

Percentage purity formula

Answer 21

Mass of pure substance/total mass of substance x 100

Question 22

What is different about how you calculate the Mr of hydrated salts

Answer 22

You calculate the mr of the salt and the water separately and then you add them

Question 23

What does crystallisation form

Answer 23

Insoluble base

Question 24

What does precipitation form

Answer 24

Insoluble salt/precipitate

Question 25

What is the formula for pressure

Answer 25

P=F/A

Question 26

Pottassium Manganate formula

Answer 26

KMnO4

Question 27

What is another name for iron oxide

Answer 27

Rust

Question 28

Methane

Answer 28

CH4