10/22/25, 7:02 AM AQA AS Level Chemistry Paper 1 EXAM (updated 2025) Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026 Fl…
AQA AS Level Chemistry Paper 1 EXAM (updated
2025) Questions & Answers | Latest Already
Graded A+ UPDATE 2025|2026
Save
Terms in this set (190)
Describe the nuclear - Nucleus containing of protons and neutrons.
model of an atom. [2] - Surrounded by electrons in energy levels.
State the relative mass and Mass: 1
charges of a proton [2]. Charge: +1
State the relative mass and Mass: 1
charges of a neutron. [2] Charge: 0
Define atomic number (Z). The number of protons in an atom.
[1]
State the relative mass and Mass: 1/1840
charges of an electron. [2] Charge: -1
Define mass number (A). The number of protons and neutrons combined in an
[1] atom
Atoms with the same number of protons but a
Define isotope. [1]
different number of neutrons.
Describe the chemical -Same chemical properties.
properties of two isotopes -As same electron configuration.
of the same element. [2]
https://quizlet.com/1096667218/aqa-as-level-chemistry-paper-1-exam-updated-2025-questions-answers-latest-already-graded-a-update-20252026-fl… 1/27
,10/22/25, 7:02 AM AQA AS Level Chemistry Paper 1 EXAM (updated 2025) Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026 Fl…
- Identify elements
State the uses of mass - Determine relative molecular mass.
spectrometry: [4] - Determine isotopic mass.
- Determine relative abundance of isotopes.
Why is mass spectrometry Prevent positive ions from colliding with molecules in
done in a vacuum? [1] the air.
- Sample dissolved in volatile solvent.
- Injected through a fine hypodermic needle giving a
fine mist/aerosol.
Describe electrospray
- Tip of needle connected to positive terminal of a
ionisation: [4]
high voltage.
- Each molecule gains a proton as it leaves the
needle.
- The positive ions are attracted to a negatively
charged plate and accelerate towards it.
Describe acceleration: [2] - All ions accelerate forward so that they have the
same kinetic energy, but reach different velocities due
to their varying masses. (lighter → faster)
- Some of the ions pass through a hole in the
negatively charged plate, forming a beam of particles.
They travel along the 'flight tube' towards the
Describe ion drift: [2]
detector.
- As the ions are travelling at different speeds, they
drift apart further.
- When the positive ions hit the negatively charged
detection plate, they gain an electron.
Describe detection: [2]
- This generates a current, the size of which is
proportional to the number of each type of ion.
The signal from the detector is passed to a computer
Describe data analysis: [1]
which generates a mass spectrum from the current.
What does each peak on - Each peak represents different isotope.
the graph represent? [2] - Height gives relative abundance of each isotope.
https://quizlet.com/1096667218/aqa-as-level-chemistry-paper-1-exam-updated-2025-questions-answers-latest-already-graded-a-update-20252026-fl… 2/27
, 10/22/25, 7:02 AM AQA AS Level Chemistry Paper 1 EXAM (updated 2025) Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026 Fl…
(sum of abundances not 100)
Give the formula for
relative atomic mass: [1]
- Found in shells, orbiting nucleus.
Describe where electrons
- Within each shell there are sub-shells.
are found. [3]
- Within each sub-shell we find orbitals.
An orbital is a region within an atom that can hold up
Define orbital. [1]
to two electrons with opposite spins.
How many orbitals are a) one s orbital
there in... b) three p orbitals
a) an s sub-shell c) five d orbitals
b) a p sub-shell
c) a d sub-shell [3]
Define highest energy The outer most electron on an atom or ion.
electron. [1]
What is stated by the Orbitals of lower energy are always filled first.
Aufbau principle? [1]
What are the exceptions Cr - 3d5 4s2
to the Aufbau principle? Cu - 3d10 4s1
[3]
The amount of energy needed to remove a mole of
Define ionisation energy.
electrons from a mole of atoms, in the gaseous state.
[2]
Units kJmol-1
Why does ionisation The second electron is removed from an ion that
energy increase each already has a positive charge.
time? [1]
Give the equation for 3rd
ionisation energy. [1]
https://quizlet.com/1096667218/aqa-as-level-chemistry-paper-1-exam-updated-2025-questions-answers-latest-already-graded-a-update-20252026-fl… 3/27
AQA AS Level Chemistry Paper 1 EXAM (updated
2025) Questions & Answers | Latest Already
Graded A+ UPDATE 2025|2026
Save
Terms in this set (190)
Describe the nuclear - Nucleus containing of protons and neutrons.
model of an atom. [2] - Surrounded by electrons in energy levels.
State the relative mass and Mass: 1
charges of a proton [2]. Charge: +1
State the relative mass and Mass: 1
charges of a neutron. [2] Charge: 0
Define atomic number (Z). The number of protons in an atom.
[1]
State the relative mass and Mass: 1/1840
charges of an electron. [2] Charge: -1
Define mass number (A). The number of protons and neutrons combined in an
[1] atom
Atoms with the same number of protons but a
Define isotope. [1]
different number of neutrons.
Describe the chemical -Same chemical properties.
properties of two isotopes -As same electron configuration.
of the same element. [2]
https://quizlet.com/1096667218/aqa-as-level-chemistry-paper-1-exam-updated-2025-questions-answers-latest-already-graded-a-update-20252026-fl… 1/27
,10/22/25, 7:02 AM AQA AS Level Chemistry Paper 1 EXAM (updated 2025) Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026 Fl…
- Identify elements
State the uses of mass - Determine relative molecular mass.
spectrometry: [4] - Determine isotopic mass.
- Determine relative abundance of isotopes.
Why is mass spectrometry Prevent positive ions from colliding with molecules in
done in a vacuum? [1] the air.
- Sample dissolved in volatile solvent.
- Injected through a fine hypodermic needle giving a
fine mist/aerosol.
Describe electrospray
- Tip of needle connected to positive terminal of a
ionisation: [4]
high voltage.
- Each molecule gains a proton as it leaves the
needle.
- The positive ions are attracted to a negatively
charged plate and accelerate towards it.
Describe acceleration: [2] - All ions accelerate forward so that they have the
same kinetic energy, but reach different velocities due
to their varying masses. (lighter → faster)
- Some of the ions pass through a hole in the
negatively charged plate, forming a beam of particles.
They travel along the 'flight tube' towards the
Describe ion drift: [2]
detector.
- As the ions are travelling at different speeds, they
drift apart further.
- When the positive ions hit the negatively charged
detection plate, they gain an electron.
Describe detection: [2]
- This generates a current, the size of which is
proportional to the number of each type of ion.
The signal from the detector is passed to a computer
Describe data analysis: [1]
which generates a mass spectrum from the current.
What does each peak on - Each peak represents different isotope.
the graph represent? [2] - Height gives relative abundance of each isotope.
https://quizlet.com/1096667218/aqa-as-level-chemistry-paper-1-exam-updated-2025-questions-answers-latest-already-graded-a-update-20252026-fl… 2/27
, 10/22/25, 7:02 AM AQA AS Level Chemistry Paper 1 EXAM (updated 2025) Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026 Fl…
(sum of abundances not 100)
Give the formula for
relative atomic mass: [1]
- Found in shells, orbiting nucleus.
Describe where electrons
- Within each shell there are sub-shells.
are found. [3]
- Within each sub-shell we find orbitals.
An orbital is a region within an atom that can hold up
Define orbital. [1]
to two electrons with opposite spins.
How many orbitals are a) one s orbital
there in... b) three p orbitals
a) an s sub-shell c) five d orbitals
b) a p sub-shell
c) a d sub-shell [3]
Define highest energy The outer most electron on an atom or ion.
electron. [1]
What is stated by the Orbitals of lower energy are always filled first.
Aufbau principle? [1]
What are the exceptions Cr - 3d5 4s2
to the Aufbau principle? Cu - 3d10 4s1
[3]
The amount of energy needed to remove a mole of
Define ionisation energy.
electrons from a mole of atoms, in the gaseous state.
[2]
Units kJmol-1
Why does ionisation The second electron is removed from an ion that
energy increase each already has a positive charge.
time? [1]
Give the equation for 3rd
ionisation energy. [1]
https://quizlet.com/1096667218/aqa-as-level-chemistry-paper-1-exam-updated-2025-questions-answers-latest-already-graded-a-update-20252026-fl… 3/27
