alevel basics

Question 1

atomic number the big or small number

Answer 1

small

Question 2

Relative isotopic mass

Answer 2

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

Question 3

Relative atomic mass

Answer 3

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

Question 4

Spectrometer- how does it work

Answer 4

.put samples in
.ionised by negative plates(ionisation)
.accelerating caused by neg plates
.same charge+same ke
.pass neg plates and drift down drift chamber
.lighter electrons move faster than heavier ones
.ions gains electrons from detector
.transfer of electrons causes current

Question 5

Spectrometer- why a vacuum

Answer 5

stop ions from colliding with particles in air

Question 6

Uses of mass spectrometry

Answer 6

.In radioactive dating(carbon 14 is radioactive. It can be measured to date archaeological finds)
.To detect steroid use in sport
.In the pharmaceutical industry(new pharmaceuticals can be found using mass spec and to test the purity of pharmaceuticals in the manufacturing industry)

Question 6

Suggest why the second ionisation energy of oxygen has a greater value than the first ionisation energy of oxygen.

Answer 6

the O+ ion, is smaller than the O atom
OR
the electron repulsion/shielding is smaller
OR
the proton : electron ratio in the 2+ ion is greater than in the 1+ ion

Question 7

Define the term first ionisation energy.

Answer 7

the energy required to remove one electron from each atom in one mole of gaseous atoms forming a uni positive ion