DJA1). Amount If Substance

Question 1

Relative molecular mass / Mr

Answer 1

The mass of that molecule compared to 1/12 the number relative atomic mass of carbon 12

Question 2

Avogadro’s constant definition

Answer 2

The number of particles (atoms, ions, molecules, electrons etc…) in 1 mile of substance

Question 3

Avogadro’s constant symbol and number

Answer 3

L= 6.022x10^23 particles (don’t need to know number)

Question 4

Number of particles in x number of miles of substance y…..

Answer 4

number = moles times L (Avogadro’s constant)

Question 5

Limiting reagent=

Answer 5

Substance with least number of moles

Question 6

Uncertainty = (number and %)

Answer 6

Half the smallest division
%= uncertainty divided by measurement x100
Must calculate all uncertainties in percentages then add them all together to get total percentage uncertainty

Question 7

Ideal gas equation

Answer 7

PV=nRT

Question 8

IDGE

P=

Answer 8

Pressure (Pa)

Question 9

V

Answer 9

Volume (m^3)

Question 10

n

Answer 10

Moles

Question 11

R

Answer 11

Gas constant (Jmol^-1K^-1)

Question 12

T

Answer 12

Temperature (K)

Question 13

KPa -Pa

Answer 13

x1000

Question 14

MPa-Pa

Answer 14

x1000000

Question 15

dm^3 - m^3

Answer 15

/1000

Question 16

cm^3 -m^3

Answer 16

/1000000

Question 17

Degrees - kelvin

Answer 17

Degrees + 273

Question 18

1 atm =

Answer 18

101000Pa

Question 19

Gas constant=

Answer 19

8.31 Jmol^-1K^-1

Question 20

Ideal gas has what type of particles

Answer 20

Point like

So when they collide no energy is lost

Question 21

Molecular formula

Answer 21

The actual number of atoms of each element in a molecule

Question 22

Empirical formula

Answer 22

The simples whole number ratio of atoms of each element in a compound

Question 23

atom economy =

Answer 23

Mr of wanted product divided by Mr of products x 100

Question 24

To find molecular from empirical

Answer 24

Empirical x Mr / formula mass of empirical

Question 25

RFM/ Ar definition

Answer 25

The weighted average mass of an atom of an element taking into account all its naturally occurring isotopes relative to 1/12 the relative atomic mass of carbon 12

Question 26

a

Answer 26

a

Question 27

a

Answer 27

a

Question 28

b

Answer 28

b

Question 29

b

Answer 29

b