AS Level Chemistry 2026 |
Study Guide, Practice
Questions & Exam
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Updated 2026 Questions and Answers
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Rationales
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, Deflection Ions are deflected through magnetic field according to mass (heavy - deflect
least)(light - deflect most)
Detection A calibrated detector records degree of deflection and interprets this into mass
What does mass spectroscopy provide? Information about masses of particles inside machine and how often it's detected.
What is shown on mass spectrum? Different isotopes relative abundance and molecular peak is furthest to right
Molecular ion peak Peak corresponding to relative molecular mass of the compound (parent peak)
Why are there sometimes line after the parent peak? They are a result of carbon 13 isotope and isn't considered when identifying a
compound
1st Ionisation energy The energy change when 1 mole of electrons is removed from 1 mole of gaseous
atoms to form 1 mole of gaseous 1+ions
Nth Ionisation energy Energy required to remove 1 electron feom each (n-1)+ ion in 1 mole of gaseous
(n-1)+ ions to form 1 mole of gaseous n+ions
Ground state Natural state of existence with electrons in lowest energy position
Orbital Region around atom nucleus which can hold maximum of 2 electrons
What's responsible for trends of 1st IE in first 20 Sub-shells
elements?
Describe an S-orbital Simplest of all, is spherical. The quantum number dictates how far away from the
nucleus it is.
Describe P-orbital Elongated dumbbell shape vary in charge density with area of greatest
concerned increasing with distance from nucleaus due to principle quantum
number. Have 3 different orientation of spaces. (x,y,z)
Study Guide, Practice
Questions & Exam
Revision
|Graded A+ | Guaranteed
success|
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, Deflection Ions are deflected through magnetic field according to mass (heavy - deflect
least)(light - deflect most)
Detection A calibrated detector records degree of deflection and interprets this into mass
What does mass spectroscopy provide? Information about masses of particles inside machine and how often it's detected.
What is shown on mass spectrum? Different isotopes relative abundance and molecular peak is furthest to right
Molecular ion peak Peak corresponding to relative molecular mass of the compound (parent peak)
Why are there sometimes line after the parent peak? They are a result of carbon 13 isotope and isn't considered when identifying a
compound
1st Ionisation energy The energy change when 1 mole of electrons is removed from 1 mole of gaseous
atoms to form 1 mole of gaseous 1+ions
Nth Ionisation energy Energy required to remove 1 electron feom each (n-1)+ ion in 1 mole of gaseous
(n-1)+ ions to form 1 mole of gaseous n+ions
Ground state Natural state of existence with electrons in lowest energy position
Orbital Region around atom nucleus which can hold maximum of 2 electrons
What's responsible for trends of 1st IE in first 20 Sub-shells
elements?
Describe an S-orbital Simplest of all, is spherical. The quantum number dictates how far away from the
nucleus it is.
Describe P-orbital Elongated dumbbell shape vary in charge density with area of greatest
concerned increasing with distance from nucleaus due to principle quantum
number. Have 3 different orientation of spaces. (x,y,z)
