Amount of substance

Question 1

Avogadro’s Law

Answer 1

Equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.

Question 2

V1/n1= (where v=volume and n=moles)

Answer 2

V2/n2

Question 3

value of avogadros constant

Answer 3

24dm^3

Question 4

room temperature and pressure

Answer 4

298K, 1atm

Question 5

The ideal gas law states

Answer 5

that the pressure, temperature, and volume of gas are related to each other.

Question 6

pV = (p=pressure, V=volume)

Answer 6

nRT (n=moles, R=gas constant, T=temperature in kelvins)

Question 7

what is pressure measured in for ideal gas law

Answer 7

Pascals

Question 8

what is volume measured in for ideal gas law

Answer 8

metres cubed

Question 9

gas constant value and units

Answer 9

8.31 Jmol^-1K^-1

Question 10

percentage yield calculation

Answer 10

(actual yield/ theoretical yield) x100

Question 11

atom economy calculation

Answer 11

(Molar Mass of Desired Product/ Molar Mass of all Reactants) ×100

Question 12

methyl orange colours

Answer 12

red in acidic, orange in alkaline

Question 13

phenolphthalein colours

Answer 13

colourless in acidic, pink in alkaline

Question 14

c1v1 = (c=concentration, v=volume)

Answer 14

c2v2

Question 15

Accuracy

Answer 15

A measurement of the closeness in agreement between an individual result and the accepted value.

Question 16

Precision

Answer 16

A measurement of the closeness in agreement between independent measurements which may not be the correct value at all.

Question 17

Systematic error

Answer 17

Errors which cause readings to differ from the true value by a consistent amount each time a measurement is made.

Question 18

Random error

Answer 18

Errors which cause readings to differ from the true value by an unpredictable way from
one measurement to the next.

Question 19

percentage error calculation

Answer 19

(maximum error/ value of measurement) x100