amount of substance (physical)

Question 1

what does it mean if a non metal compound ends in ate

Answer 1

contains oxygen

Question 2

what does it mean if a non metal compound ends in ite

Answer 2

contains less oxygen

Question 3

what is avogadros constant

Answer 3

6.022 x 10^23

Question 4

units for moles

Answer 4

gmol^-1

Question 5

how do you work out moles

Answer 5

moles = mass / Mr

Question 6

what is molarity

Answer 6

concentration of a solution

Question 7

what is the units for molarity

Answer 7

mol/dm^3

Question 8

what is 1dm^3

Answer 8

1 litre or 1000cm^3

Question 9

how do you work out concentration/molarity

Answer 9

molarity = number of moles / volume dm^3

Question 10

Boyles law

Answer 10

at constant temp, product of pressure and volume is a constant
PxV=constant

Question 11

charles’ law

Answer 11

at constant pressure, volume is proportional to temp
V/T=constant

Question 12

Gay-Lussacs law

Answer 12

at constant volume, pressure is proportional to temp
P/T=constant

Question 13

whats the ideal gas equation

Answer 13

pV=nRT
pressure Pa
Volume m^3
number of mole of gas
gas constant:8.31KJ^-1mol^-1
temperature K

Question 14

what is moles for a gas

Answer 14

moles = volume (dm^3) / 24 OR
moles = volume (cm^3) / 24000

Question 15

whats equation for % atom economy

Answer 15

% atom economy = mass of desired product / total mass of reactants x 100

Question 16

what is equation for percentage yield

Answer 16

actual yield / theoretical yield x 100

Question 17

what does a high atom economy mean

Answer 17

less waste - harmful to environment.
cheaper (more profit)

Question 18

what is yield

Answer 18

mass of product obtained