AQA A LEVEL CHEMISTRY PAPER 1
2024/2025 Exam Questions with 100%
Correct Answers | Latest Update
TOF steps - 🧠 ANSWER ✔✔1) ionisation
2) acceleration
3) ion drift
4) detection
5) analysis
Electron impact - 🧠 ANSWER ✔✔Sample vaporised and electron gun fires
high energy electrons at it which knock off 1 electron from each particle,
making them 1+ ions
NB- can knock off more than one e or break molecular ion
electrospray ionization - 🧠 ANSWER ✔✔Sample dissolved in volatile
solvent then injected through needle to give fine mist which is attached to
positive end of high voltage power supply, particles gain proton
NB- Mr of substance is actually one less than shown due to extra H+
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
1
STATEMENT. ALL RIGHTS RESERVED
, Acceleration (TOF) - 🧠 ANSWER ✔✔positive ions accelerated using
electric field so they all have the same kinetic energy
Ion drift (TOF) - 🧠 ANSWER ✔✔particles with small mass have larger
velocity do ions start to separate with lightest ions reaching detector first
Detection (TOF) - 🧠 ANSWER ✔✔positive ions hit negatively charged plate
and gain an electron which forms a current, the larger the current the
higher the abundance
Analysis (TOF) - 🧠 ANSWER ✔✔-computer uses data to produce mass
spectrum which shows mass m / charge z ratio
-mr or ar is furthest right peak (small peaks larger than mr are due to
isotopes)
-may be large peaks at lower mr due to fragmentation
Electron spin - 🧠 ANSWER ✔✔Property of electron (CW or ACW)
Represented by up and down arrows
Orbitals - 🧠 ANSWER ✔✔Defined regions of space around nucleus where
electrons most likely to be found, each orbital holds 2 electrons
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
2
STATEMENT. ALL RIGHTS RESERVED
2024/2025 Exam Questions with 100%
Correct Answers | Latest Update
TOF steps - 🧠 ANSWER ✔✔1) ionisation
2) acceleration
3) ion drift
4) detection
5) analysis
Electron impact - 🧠 ANSWER ✔✔Sample vaporised and electron gun fires
high energy electrons at it which knock off 1 electron from each particle,
making them 1+ ions
NB- can knock off more than one e or break molecular ion
electrospray ionization - 🧠 ANSWER ✔✔Sample dissolved in volatile
solvent then injected through needle to give fine mist which is attached to
positive end of high voltage power supply, particles gain proton
NB- Mr of substance is actually one less than shown due to extra H+
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
1
STATEMENT. ALL RIGHTS RESERVED
, Acceleration (TOF) - 🧠 ANSWER ✔✔positive ions accelerated using
electric field so they all have the same kinetic energy
Ion drift (TOF) - 🧠 ANSWER ✔✔particles with small mass have larger
velocity do ions start to separate with lightest ions reaching detector first
Detection (TOF) - 🧠 ANSWER ✔✔positive ions hit negatively charged plate
and gain an electron which forms a current, the larger the current the
higher the abundance
Analysis (TOF) - 🧠 ANSWER ✔✔-computer uses data to produce mass
spectrum which shows mass m / charge z ratio
-mr or ar is furthest right peak (small peaks larger than mr are due to
isotopes)
-may be large peaks at lower mr due to fragmentation
Electron spin - 🧠 ANSWER ✔✔Property of electron (CW or ACW)
Represented by up and down arrows
Orbitals - 🧠 ANSWER ✔✔Defined regions of space around nucleus where
electrons most likely to be found, each orbital holds 2 electrons
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
2
STATEMENT. ALL RIGHTS RESERVED
