AQA A-LEVEL PHYSICAL CHEMISTRY EXAM WITH FREQUENTLY TESTED QUESTIONS AND ANSWERS/ EXPERT VERIFIED FOR GUARANTEED PASS/ALREADY GRADED A+

AQA A-LEVEL PHYSICAL CHEMISTRY
EXAM WITH FREQUENTLY TESTED
QUESTIONS AND ANSWERS/ EXPERT
VERIFIED FOR GUARANTEED
PASS/ALREADY GRADED A+


1 - CORRECT ANSWER ✔✔- relative mass of a proton


1 - CORRECT ANSWER ✔✔- relative mass of a neutron


1/1840 - CORRECT ANSWER ✔✔- relative mass of an electron


+1 - CORRECT ANSWER ✔✔- relative charge of a proton


0 - CORRECT ANSWER ✔✔- relative charge of a neutron


-1 - CORRECT ANSWER ✔✔- Relative charge of an electron


strong nuclear force - CORRECT ANSWER ✔✔- How is the nucleus held
together


nuclear force - CORRECT ANSWER ✔✔- is the nuclear force or electrostatic
force stronger


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,number of protons - CORRECT ANSWER ✔✔- what does the atomic number
represent


atomic number z - CORRECT ANSWER ✔✔- the number of protons in an atom


number of protons and neutrons - CORRECT ANSWER ✔✔- what does the mass
number represent


mass number (A) - CORRECT ANSWER ✔✔- the number of nucleons in an atom


isotopes - CORRECT ANSWER ✔✔- atoms of the same element that have
different numbers of neutrons


electrons - CORRECT ANSWER ✔✔- what determines the reactivity of an atom


H1/H2/H3 - CORRECT ANSWER ✔✔- hydrogen isotopes


Cl35/Cl37 - CORRECT ANSWER ✔✔- Chlorine isotopes


Br79/Br81 - CORRECT ANSWER ✔✔- Bromine isotopes


C-14 - CORRECT ANSWER ✔✔- Carbon isotope used for carbon dating


2 - CORRECT ANSWER ✔✔- Number of electrons the first shell can hold

2

,8 - CORRECT ANSWER ✔✔- Number of electrons the second shell can hold


18 - CORRECT ANSWER ✔✔- Number of electrons the third shell can hold


Relative Atomic Mass - CORRECT ANSWER ✔✔- Ar


Relative Atomic Mass - CORRECT ANSWER ✔✔- average mass of 1 atom/1/12
of 1 atom of C-12


determines the mass of separate atoms - CORRECT ANSWER ✔✔- What does the
mass spectrometer do?


Vacuum - CORRECT ANSWER ✔✔- First step of the TOF Spectrometer


Time of Flight Mass spectrometer - CORRECT ANSWER ✔✔- TOF spectrometer
full


Kept under a high vacuum to avoid collisions with air molecules - CORRECT
ANSWER ✔✔- Vacuum step (TOF)


Ionisation - CORRECT ANSWER ✔✔- 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 -
CORRECT ANSWER ✔✔- First method of ionisation (TOF)

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, Molecules gain a proton - CORRECT ANSWER ✔✔- Second method of
ionisation (TOF)


Acceleration - CORRECT ANSWER ✔✔- 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 - CORRECT ANSWER ✔✔- Acceleration step
(TOF)


mass/charge - CORRECT ANSWER ✔✔- m/z ratio


Ion Drift - CORRECT ANSWER ✔✔- 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 - CORRECT ANSWER ✔✔- Ion Drift step (TOF)


Detection - CORRECT ANSWER ✔✔- 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 -
CORRECT ANSWER ✔✔- Detection step (TOF)


Data Analaysis - CORRECT ANSWER ✔✔- Sixth step of the TOF spectrometer


signal from the detector goes to a computer which generates the mass spectrum -
CORRECT ANSWER ✔✔- Data Analysis step (TOF)
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