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Physical Chemistry AQA questions and answers 100% verified 2025 update Physical Chemistry AQA questions and answers 100% verified 2025 update Physical Chemistry AQA questions and answers 100% verified 2025 update Physical Chemistry AQA questions and answers 100% verified 2025 update Phy...

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  • March 20, 2025
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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Physical Chemistry AQA questions
and answers 100% verified 2025
update.




1- ANS.relative mass of a proton

1- ANS.relative mass of a neutron

1/1840 - ANS.relative mass of an electron

+1 - ANS.relative charge of a proton

0- ANS.relative charge of a neutron

-1 - ANS.Relative charge of an electron

strong nuclear force - ANS.How is the nucleus held together

nuclear force - ANS.is the nuclear force or electrostatic force stronger

number of protons - ANS.what does the atomic number represent

atomic number z - ANS.the number of protons in an atom

number of protons and neutrons - ANS.what does the mass number represent

,mass number (A) - ANS.the number of nucleons in an atom

isotopes - ANS.atoms of the same element that have different numbers of neutrons

electrons - ANS.what determines the reactivity of an atom

H1/H2/H3 - ANS.hydrogen isotopes

Cl35/Cl37 - ANS.Chlorine isotopes

Br79/Br81 - ANS.Bromine isotopes

C-14 - ANS.Carbon isotope used for carbon dating

2- ANS.Number of electrons the first shell can hold

8- ANS.Number of electrons the second shell can hold

18 - ANS.Number of electrons the third shell can hold

Relative Atomic Mass - ANS.Ar

Relative Atomic Mass - ANS.average mass of 1 atom/1/12 of 1 atom of C-12

determines the mass of separate atoms - ANS.What does the mass spectrometer do?

Vacuum - ANS.First step of the TOF Spectrometer

Time of Flight Mass spectrometer - ANS.TOF spectrometer full

Kept under a high vacuum to avoid collisions with air molecules - ANS.Vacuum step
(TOF)

Ionisation - ANS.Second step of the TOF spectrometer

Dissolved in solvent and passing through needle to a positive terminal with a high
voltage producing positively charged droplets which have lost electrons - ANS.First
method of ionisation (TOF)

Molecules gain a proton - ANS.Second method of ionisation (TOF)

Acceleration - ANS.Third step of the TOF spectrometer

Positive ions attached to a negative plate so they accelerate towards it, faster
depending on their m/z ratio - ANS.Acceleration step (TOF)

, mass/charge - ANS.m/z ratio

Ion Drift - ANS.Fourth step of the TOF spectrometer

Ions pass through a hole in the negative plate, forming a beam to travel along the flight
tube to the detector - ANS.Ion Drift step (TOF)

Detection - ANS.Fifth step of the TOF spectrometer

Ions with highest velocities arrive at the detector first and flight times recorded. Ions pick
up an electron which causes a current to flow so they are detected - ANS.Detection
step (TOF)

Data Analaysis - ANS.Sixth step of the TOF spectrometer

signal from the detector goes to a computer which generates the mass spectrum -
ANS.Data Analysis step (TOF)

Identify the abundance of different isotopes - ANS.What can the mass spectrometer
do

abundance - ANS.what does the height of a peak on a mass spectrum give

m/z - ANS.what does the horizontal axis on a mass spectrum give

(abundance x m/z) + (abundance x m/z) all over total abundance - ANS.How to work
out the Ar of an element from a mass spectrum

2n2 - ANS.General formula for the maximum number of electrons each energy level
can hold

s,p,d,f - ANS.four different atomic sub-levels

s- ANS.Which sub-levels does the first shell contain

s,p - ANS.Which sub-levels does the second shell contain

s,p,d - ANS.Which sub-levels does the third shell contain

2- ANS.Number of electrons the s sub-level can hold

6- ANS.Number of electrons the p sub-level can hold

3- ANS.Maximum number of p-orbitals per shell

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