formulas

Question 1

calculate the mol

Answer 1

mole = mass/Mr

Question 2

calculate mol of a volume of a solution

Answer 2

n = volume (v) (dm^3) x concentration(c) (mol dm^-3)

Question 3

mol of a gas volume

Answer 3

n = volume(V) / molar gas volume (Vm)

Question 4

ideal gas equation

Answer 4

pV = nRT

p in Pa
V in m^3
T in K

Question 5

cm^3 to m^3

Answer 5

/ 10^-6

0.000001

Question 6

dm^3 to m^3

Answer 6

x 10^-3

0.001

Question 7

degrees celsius to kelvin

Answer 7

+ 273

Question 8

kelvin to degrees celsius

Answer 8

– 273

Question 9

m^3 to cm^3

Answer 9

/ 10^-6

Question 10

m^3 to dm^3

Answer 10

x 1000

Question 11

kPa to Pa

Answer 11

x1000

Question 12

RTP

Answer 12

20 degrees celsius

101 kPa (1 atm)

Question 13

acid + metal ->

Answer 13

salt + hydrogen

Question 14

acid + metal hydroxide ->

Answer 14

salt + water

Question 15

acid + metal oxide ->

Answer 15

salt + water

Question 16

acid + metal carbonate ->

Answer 16

salt + carbon dioxide + water

Question 17

1 atm = Pa

Answer 17

101 325 Pa

Question 18

forming ionic equations steps

Answer 18

1. write charges (no charge for ‘lonely’ atoms)
2. split ions into their charges
3. cancel spectator ions
   ( doesn’t include atoms that have changed state)

Question 19

maximum number of electrons in a shell

Answer 19

2(n^2)

Question 20

increasing repulsion in electron pairs

Answer 20

bonded pair /bonded pair (least repulsion)

->

bonded pair / lone pair

->

lone pair / lone pair (most repulsion)

Question 21

avogadro constant

Answer 21

6.02 x 10^23 mol^-1