1.2 Amount of Substance

Question 1

What is relative molecular mass?

Answer 1

Average mass of the naturally occurring isotopes of a compound, compared to 1/12th mass of an atom of carbon-12

Question 2

What is relative atomic mass?

Answer 2

Average mass of the naturally occurring isotopes of an atom, compared to 1/12th the mass of an atom of carbon-12

Question 3

What is the avogadros constant?

Answer 3

Number of particles in one mole of a substance

Question 4

What is percentage yield?

Answer 4

1. The % of a product produced by a reaction, compared to a theoretical maximum

Question 5

How would you calculate percentage yield?

Answer 5

1. Mass of useful product / Expected mass of useful product

Question 6

What can the percentage yield of a practical be used to investigate?

Answer 6

Efficiency of practical techniques and whether reactions proceed as estimated

Question 7

What is atom economy?

Answer 7

% of amount of reactants made into certain useful product

Question 8

How do you calculate atom economy?

Answer 8

Mr of atoms of useful product / Mr of atoms of reactants

Question 9

What can atom economy be used to investigate?

Answer 9

Efficiency of using a specific reaction to produce a product

Question 10

What is the Ideal Gas Equation?

Answer 10

PV=nRT

Question 11

What does PV=nRT stand for?

Answer 11

Pressure x volume = number of moles x gas constant x temperature

Question 12

How do you convert from Celsius to Kelvin?

Answer 12

+273

Question 13

What is empirical formula?

Answer 13

Simplest whole number ratio of atoms in a compound

Question 14

What is the equation that links moles, concentration and volume?

Answer 14

moles = concentration x volume