Amounts Of Susbtances

Question 1

Define a mole

Answer 1

Amount of a substance that contains the same number of elementary particles as 12g of carbon-12

Question 2

Avagadro’s number

Answer 2

6.02 X10*23

Question 3

Valency definition

Answer 3

Ionic charge

Question 4

Coefficient

Answer 4

Large ratio number in front of a compound

Question 5

Subscript

Answer 5

Small number at bottom of compound element to show how many atoms of that element there are

Question 6

Hydrogen carbonate ion HCO3 charge

Answer 6

-1

Question 7

Phosphate ion charge PO4

Answer 7

-3

Question 8

What does ide indicate

Answer 8

2 elements bonded
Sodium sulfide
Eg. Na2S

Question 9

What does age indicate

Answer 9

3 elements bonded
Sodium nitrate
Eg. NaNO3

Question 10

What does ite indicate

Answer 10

1 less oxygen than ate
Sodium nitrite
NaNO2

Question 11

How to find ionic equations

Answer 11

Split aq compounds into ions and cancel

Question 12

Hydroxide ionic equation

Answer 12

H+(aq) + OH-(aq) —> H2O(l)

Question 13

Carbonate ionic equation

Answer 13

H+(aq) + CO3*2-(aq) —> H2O(l) + CO2(g)

Question 14

Hydrogen carbonate ionic equation

Answer 14

H+(aq) + HCO3-(aq) —> H2O(l) + CO2(g)

Question 15

Ammonia ionic equation

Answer 15

H+(aq) + NH3(aq) —> NH4+(aq)

Question 16

How do ionic compounds dissolve in water

Answer 16

Positive and negative ions separate and become hydrated

Question 17

Which ionic compounds are soluble (5)

Answer 17

Group 1
Ammonium
Nitrates
Chlorides (not Ag, Pb)
Sulphates (not Ca, Ba, Pb, Sr)

Question 18

Insoluble ionic compounds (3)

Answer 18

Carbonates
Hydroxides
Oxides
(Not PANNa)

Question 19

Aqueous solution definition

Answer 19

No. Moles dissolved per dm3 solution
No. Grams dissolved per dm3 solution

Question 20

What does m represent in the molar gas equation

Answer 20

Space occupied by 1 gaseous mole

Question 21

Standard conditions

Answer 21

273K/0°C
100KPa
22.4 dm3/mol

Question 22

Room conditions

Answer 22

293/20°C
100KPa
24 dm3/mol

Question 23

Gas volume rule

Answer 23

Equal volumes of gas at the same temperature and pressure contain an equal number of molecules

Question 24

Ideal gas equation

Answer 24

PV = nRT
P - pressure (Pa)
V - volume (m3)
n - moles (mol)
R - gas constant (8.31J/K/mol)
T - temperature (K)

Question 25

°C —> K

Answer 25

+273

Question 26

1atm —> Pa

Answer 26

X100,000

Question 27

Cm3 —> m3

Answer 27

X1,000,000

Question 28

Dm3 —> m3

Answer 28

/1000

Question 29

What is atom economy

Answer 29

Measure if the proportion of reactant atoms that become part of the desired product

Question 30

Atom economy equation

Answer 30

RFM desired products / total RFM of reactants or products X100 Used balanced equation

Question 31

Advantages of a good atom economy

Answer 31

Efficient, low production cost More product to sell Less waste, less disposal cost Less waste, better for environment More availability, lower prices

Question 32

Percentage yield equation

Answer 32

Actual amount of product/ theoretical X100

Question 33

Reasons for low percentage yield

Answer 33

Reversible reaction Unexpected reaction/product Lost in handling/left in apparatus Not completely pure Difficult to separate products