Amount of Substance

Question 1

Acid + Base –> _____+_____

Answer 1

Salt + water

Question 2

Acid + Carbonate –> ____+____+____

Answer 2

salt + water + carbon dioxide

Question 3

ionic equation for neutralisation

acid and base

Answer 3

H+ (aq) + OH-(aq) –> H20 (l)

Question 4

ionic equation for neutralisation

acid and carbonate

Answer 4

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

Question 5

ionic equation for neutralisation (acid and hydrogencarbonate )

Answer 5

H+(aq) + HCO3-(aq) -> H2O (l) + CO2 (g)

Question 6

ionic equation for neutralisation

acid and ammonia

Answer 6

H+(aq) + NH3(aq) -> NH4+(aq) compound

Question 7

spectator ions

Answer 7

ions not involved in a reaction involving ionic compounds dissolved in water

Question 8

mass and mole formula

Answer 8

moles = mass (g) / Mr

Question 9

moles and concentration formula

Answer 9

no. of moles = conc. (mol/dm3) x vol. (dm3)

Question 10

ideal gas equation and what are they measured in?

Answer 10

PV = nRT
P (Pa)
V (M3)
n (no. of moles)
R (8.31)
T (K)

Question 11

what assumptions are made in the ideal gas equation?

Answer 11

molecules/atoms exert no force on each other
they don’t react when they collide
they occupy negligible volume

Question 12

what is relative atomic mass of an atom

Answer 12

the average mass of an atom of an element relative to 1/12 the relative atomic mass of an atom of carbon-12

Question 13

what is the relative molecular mass of a molecule?

Answer 13

the mass of a molecule compared to 1/12 the relative atomic mass of an atom of carbon-12

Question 14

what is the atom economy of a reaction?

Answer 14

a ratio of the mass of desired product to the mass of all products

Question 15

how do you calculate atom economy?

Answer 15

(Mr of mass of desired product/Mr or mass of all products) x100

Question 16

what are concordant titres?

Answer 16

titres within 0.1cm3 of each other

Question 17

what is the empirical formula of a substance?

Answer 17

the simplest whole number ratio of atoms of each element in a substance

Question 18

Avogadro’s’ constant?

Answer 18

the number of particles in one mole of an atom : 6.022 x 10^23

Question 19

what is a solvent?

Answer 19

a liquid that can have a substance dissolved into it

Question 20

what is a solute?

Answer 20

a solid that can be dissolved

Question 21

what is a solution?

Answer 21

a solute dissolved in a solvent

Question 22

what is Boyle’s law?

Answer 22

product of pressure and volume is constant as long as temperature remains constant
pressure x volume = constant

Question 23

Gay-Lussac’s law?

Answer 23

the pressure of a gas is directly proportional to the Kelvin temperature if the volume is constant
(pressure x volume) / temperature = constant for a fixed mass of a gas

Question 24

Charles’ law?

Answer 24

volume is proportional to temperature as long as the pressure remains constant
volume / temperature = constant

Question 25

what is stoichiometry?

Answer 25

the ratio in which the reactants react and products are produced in simple whole numbers

Question 26

what is the molecular formula?

Answer 26

the actual number of atoms of each element in a molecule

Question 27

what is percentage yield?

Answer 27

actual output / predicted output x 100