Physical

Question 1

What is a nucleon

Answer 1

Sub atomic particles in the nucleus

Question 2

RAM Ar definition

Answer 2

The average mass of an atom compared to 1/12th the mass of carbon 12

Question 3

RMM Mr

Answer 3

The average mass of a molecule compared to 1/12th the mass of carbon 12

Question 4

How to calculate RAM with isotopes

Answer 4

Isotopic mass x percentage)+(isotopic mass x percent)/100

Question 5

Mass spectrometry stages(4)

Answer 5

1 Ionise-remove electron= positive ion
2 Acceleration- accelerates ions in electric field
-same kE for all ions
-ions with lower mass=higher acceleration
3 ion drift-ions enter region with no electrical field and drift
-ions with lower mass drift at higher speeds
4 Detection-ions with lower mass reach detector first

Question 6

Electrospray

Answer 6

-Dissolved in volatile solvent
-injected as an aerosol through a needle
-needle has high positive charge
-sample gains H+ ion (proton)
-forms MH+ ion

Question 7

Electron impact

Answer 7

-high energy electrons
- electron gun
-fired at sample
-knocks off electron= gains electron

Question 8

Detector -ToF

Answer 8

-Detector consists of a negatively charged plate
-Positive ions reach detector+become discharged by drawing an electron from the detector
- creating a current
-detector is connected to a computer which records time of particular ion to reach it

Question 9

First ionisation energy is

Answer 9

The energy needed to remove 1 electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous ions

Question 10

Spectator ion

Answer 10

Doesn’t ppt in reaction

Question 11

Limiting reactant

Answer 11

Runs out first and determines product made