Random

Question 1

How does mass spectrometry work

Answer 1

• sample in vaporised form is inputted into a vacuum chamber
• into an isonisation area
• using an electron gun: accelerates electrons to become positive ions
• ions are accelerated
• detected where lighter first and then heavier

Question 2

Nitrite

Answer 2

NO2 -

Question 3

Sulphite

Answer 3

SO3 -2

Question 4

Hydrogen carbonate

Answer 4

HCO3 -

Question 5

Dichromate

Answer 5

Cr2O7 -2

Question 6

Manganate (7)

Answer 6

MnO4 -

Question 7

Nitrates and chlorides

Answer 7

Are always soluble

Question 8

All carbonates are

Answer 8

Insoluble except for group 1 and ammonium

Question 9

Mole definition

Answer 9

Amount of substance found in 12g of C-12, as one mole of substance contains the same number of entities as there are in 12g of C-12

Question 10

How would you reduce percentage uncertainty in mass of residue

Answer 10

• use a mass balance to more dp
• use a larger mass of the product

Question 11

How can you tell all water removed

Answer 11

Heat mass and record until constant/ unchanged mass to indicate all water has been removed

Question 12

Ideal gas changing from m3 to cm 3 and dm3

Answer 12

• 10^6 and *10^3

Question 13

In acid base eq, when given mol for certain vol…

Answer 13

Multiply mol by sf that volume has increased by and use

Question 14

Uncertainty

Answer 14

Uncertainty of equipment/ measurement *100
If used twice like burette, *2

Question 15

Relative formula mass

Answer 15

Mass of a formula unit relative to 1/12th the mass of a c-12

Question 16

Assumption for water of crystallisation

Answer 16

• all water has been lost
• no further decomposition as we cannot tell without a colour change