AQA Chemistry A level exam 2024
What is the relative mass and charge on a proton? - Mass 1
charge +1
What is the relative mass and charge on a neutron? - Mass 1
Charge 0
What is the relative mass and charge on an electron? - Mass 1/2000
Charge -1
What is the mass number? - The total number of protons and neutrons in the
nucleus of an atom
What is the Atomic (proton) number? - This is the number of protons in the
nucleus of an atom and is used to identify an element
What are Ions? - Ion have different numbers of protons and electrons. Negative
ions have more electrons than protons and positive ions have fewer electrons
than protons.
,AQA Chemistry A level exam 2024
What are isotopes? - Isotopes of an element are atoms with the same number of
protons but different numbers of neutrons
describe Thomson's model of the atom. - Thomson's model of the atom was like a
'plum pudding' with a positively charged pudding (solid sphere) that contained
negatively charged particles (electrons).
What was found in Rutherford's gold foil experiment? - When alpha particles were
fired at a thin gold sheet, most of them passed straight through with a very small
number deflected straight back.
What was Rutherford's new nuclear model for the atom? - A tiny positively
charged nucleus at the centre, surrounded by a cloud of negative electrons. Most
of the atom is empty space.
What did Bohr's atom model show? - Electrons only exist in fixed orbits and not
anywhere in between.
Each Shell has a fixed energy.
When an electron moves between shells, electromagnetic radiation is emitted or
absorbed.
Because the energy of the shells is fixed, the radiation will have a fixed energy.
,AQA Chemistry A level exam 2024
What difference is found between the original Bohr atom model and the refined
Bohr model? - Scientists discovered that not all electrons in a shell have the same
energy, so it was refined to include sub shell's.
What is relative atomic mass? - The average mass of an atom of an element
compared to one twelfth of the mass of an atom of carbon 12.
What is relative isotopic mass? - Relative isotopic mass is the mass of an atom of
an isotope of an element on a scale where an atom of Carbon-12 is exactly 12.
Calculating relative atomic mass - relative atomic mass = isotopic masses x
percentages/total percentage
What is relative molecular mass? - The average mass of an entity compared to one
twelfth of the mass of an atom of carbon 12.
What is the equation used to calculate the number of moles of any substance? -
Number of moles = mass(g)/ mass of one mole (mol)
, AQA Chemistry A level exam 2024
What are the 5 stages in mass spectrometery? - vaporisation, ionisation,
acceleration, deflection, and detection
What happens during the vaporisation stage of mass spectrometry? - The sample
is turned into a gas using an electrical heater in a vacuum.
What happens during the ionisation stage of mass spectrometry? - An electron
gun fires a beam of high energy electrons which bombards the gaseous particles,
knocking off electrons leaving a positive ion
What happens during the acceleration stage of mass spectrometry? - The positive
ions are attracted by negatively charged plates in an electric field which
accelerates the ions and focuses the beam.
What happens during the deflection stage of mass spectrometry? - The fast
moving ions pas into a string magnetic field, deflecting the ions into a curved path.
The degree of deflection depends on the Mass/charge ratio (m/z). Ions with with a
high m/z ratio are deflected the least (they're heavier). The strength of the
magnet is gradually increased so that ions with different m/z ratios are deflected
towards the detector.
What is the relative mass and charge on a proton? - Mass 1
charge +1
What is the relative mass and charge on a neutron? - Mass 1
Charge 0
What is the relative mass and charge on an electron? - Mass 1/2000
Charge -1
What is the mass number? - The total number of protons and neutrons in the
nucleus of an atom
What is the Atomic (proton) number? - This is the number of protons in the
nucleus of an atom and is used to identify an element
What are Ions? - Ion have different numbers of protons and electrons. Negative
ions have more electrons than protons and positive ions have fewer electrons
than protons.
,AQA Chemistry A level exam 2024
What are isotopes? - Isotopes of an element are atoms with the same number of
protons but different numbers of neutrons
describe Thomson's model of the atom. - Thomson's model of the atom was like a
'plum pudding' with a positively charged pudding (solid sphere) that contained
negatively charged particles (electrons).
What was found in Rutherford's gold foil experiment? - When alpha particles were
fired at a thin gold sheet, most of them passed straight through with a very small
number deflected straight back.
What was Rutherford's new nuclear model for the atom? - A tiny positively
charged nucleus at the centre, surrounded by a cloud of negative electrons. Most
of the atom is empty space.
What did Bohr's atom model show? - Electrons only exist in fixed orbits and not
anywhere in between.
Each Shell has a fixed energy.
When an electron moves between shells, electromagnetic radiation is emitted or
absorbed.
Because the energy of the shells is fixed, the radiation will have a fixed energy.
,AQA Chemistry A level exam 2024
What difference is found between the original Bohr atom model and the refined
Bohr model? - Scientists discovered that not all electrons in a shell have the same
energy, so it was refined to include sub shell's.
What is relative atomic mass? - The average mass of an atom of an element
compared to one twelfth of the mass of an atom of carbon 12.
What is relative isotopic mass? - Relative isotopic mass is the mass of an atom of
an isotope of an element on a scale where an atom of Carbon-12 is exactly 12.
Calculating relative atomic mass - relative atomic mass = isotopic masses x
percentages/total percentage
What is relative molecular mass? - The average mass of an entity compared to one
twelfth of the mass of an atom of carbon 12.
What is the equation used to calculate the number of moles of any substance? -
Number of moles = mass(g)/ mass of one mole (mol)
, AQA Chemistry A level exam 2024
What are the 5 stages in mass spectrometery? - vaporisation, ionisation,
acceleration, deflection, and detection
What happens during the vaporisation stage of mass spectrometry? - The sample
is turned into a gas using an electrical heater in a vacuum.
What happens during the ionisation stage of mass spectrometry? - An electron
gun fires a beam of high energy electrons which bombards the gaseous particles,
knocking off electrons leaving a positive ion
What happens during the acceleration stage of mass spectrometry? - The positive
ions are attracted by negatively charged plates in an electric field which
accelerates the ions and focuses the beam.
What happens during the deflection stage of mass spectrometry? - The fast
moving ions pas into a string magnetic field, deflecting the ions into a curved path.
The degree of deflection depends on the Mass/charge ratio (m/z). Ions with with a
high m/z ratio are deflected the least (they're heavier). The strength of the
magnet is gradually increased so that ions with different m/z ratios are deflected
towards the detector.
