Headstart

Question 1

relative mass of electron

Answer 1

1/1836 AMU

Question 2

isotopes

Answer 2

atoms of the same element which have different number of neutrons

Question 3

why do you use the word ‘relative’ when talking about the abundance of isotopes

Answer 3

because we are comparing the amount of each isotope of the same element

Question 4

How to calculate RAM (Relative Atomic Mass)

Answer 4

[mass isotope 1 (abundance%) + mass isotope 2 (abundance%) +ect]/
100

Question 5

ionic bond

Answer 5

Strong electrostatic forces of attraction between oppositely charged ions

Question 6

mole calculations

Answer 6

moles= mass/Mr
moles= number of particles-N/avogadro's constant-Na (6.022*10^23)
moles= cv - c= molarity M

Question 7

atom economy

Answer 7

mass of useful product / total mass of reactants - percentage form

Question 8

empirical formula

Answer 8

simplest whole number ratio of elements in a compound

Question 9

concentration

Answer 9

the amount of solute in a given volume of solution/ number of moles of solute per litre of solution

Question 10

hydrocarbon

Answer 10

molecule that contains only hydrogen and carbon

Question 11

combustion

Answer 11

burning in oxygen

Question 12

complete combustion and incomplete combustion of alkanes and alkenes

Answer 12

complete- alka/ene + oxygen –> carbon dioxide + water
incomplete- alka/ene + oxygen –> carbon (soot) + water
–> carbon monoxide + water

Question 13

calculating energy release

Answer 13

Q = mcAT
q= quantity of energy (kJ)
m= mass of water (kg)
c= specific heat capacity - 4.18
AT= change in temp (C)

Question 14

isomers

Answer 14

compounds with the same molecular formulae but different structural formulae

Question 15

systematic error

Answer 15

constant bias in a measurement that cannot be eliminated by repeating the measurement