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Edexcel A Level Chemistry 2024 Exam Questions and Answers
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Edexcel A Level Chemistry 2024 ExamQuestions and Answers
how to test for C=C - Answer>>decolourises bromine water
Atomic Number - Answer>>number of protons in the nucleus of
an atom of that element.
Mass Number - Answer>>the sum of protons and neutrons in a
nuclues of an atom
Isotopes - Answer>>atoms of the same elementwith the same
numberof protons but different nuber of neutrons
,Relative Atomic Mass - Answer>>the average mass of an atom
of an element compared to a twelfth of the mass of an atom of
carbon-12.
Relative Isotopic Mass - Answer>>The mass of an atom of an
isotope compared to one-twelfth of the mass of an atom of
carbon-12
Quantum Shell - Answer>>the energy level of an electron.
Orbital - Answer>>a region around the nucleus that can hold up
to two electrons with opposite spins.
What shape is the S orbital - Answer>>spherical
What shape is the P orbital - Answer>>dumbell
,First Ionisation Energy - Answer>>the measure of energy is
needed to completely remove one mole of electron from one mole
of gaseous atom
Second Ionisation Energy - Answer>>is a measure of energy
needed to remove one-mole of electron from one mole of
gaseous ion
Periodicity - Answer>>A repeating trend in the properties of the
elements across the periodic table
Why are copper and chromium important to do with filling up their
subshells? - Answer>>because they have a half-filled subshell.
This gives added stability so minimises electron repulsion
Why is the first ionisation energy the lowest? - Answer>>it is the
lowest because the electron is further away from the nucleus so
less attraction and more shielding by the inner electrons. This
means less energy is needed to remove the electron.
Why does ionisation energy increase as you go across the
period? - Answer>>as you go across the periodic table there
are more protons so more attraction to the electrons so
decreasing atomic radii. This increases the ionisation energy.
first ionisation energy for sodium - Answer>>see pic
Why does ionisation energy increase from Na to Mg -
Answer>>ionisation energy increases becasue magnesium has
more protons so more attraction to the electron
Why does ionisation energy decrease from Mg to Al -
Answer>>because the electron being removed is from a new
, subshell. This means the electron is futher away from the nucleus
so less attraction to the nucleus.
Why does ionisation energy decrease from P to S -
Answer>>There are more electrons in the same orbital so more
repulsion.
What is the trend in ionisation energy as you go down the period?
- Answer>>As you go down periods the electros get further
away from the nucleus and atomic radii increases. This means
there is more shielding by inner electrons.
Why does successive ionisation energy increase? -
Answer>>because as you remove an electron the ratio of
proton to electron increases. This means more attraction and so
more energy needed to remove electrons.
Explain the stages of mass spectrometer. -
Answer>>Vapourisation- the sample is heated to produce
gaseous atom.
Ionisation- an electron gun is used to knock off electrons from the
sample.
Acceleration- the speed is increased to make deflection easier.
Deflection- sample is deflected by electromagnet
Detector- the sample is detected by detector.
Why is fluorine the most reactive element - Answer>>because it
has 7 protons which are pulling the electron so it is harder to lose
electrons
Decribe the trend in reactivity as you go down group 1 -
Answer>>as you go down group one
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