Observations & Results: Acceptable Observation Words Used By Examiners (Copy)
Observations & Results
Acceptable Observation Words Used By Examiners
Why Exact Observation Words Matter in ATP
- Examiners mark observations using:
- Very strict wording
- Even correct ideas:
- Lose marks if phrasing is wrong
- ATP marking schemes reward:
- Standardised, examiner-approved vocabulary
- Using unacceptable words:
- Converts an observation into an inference
- Scores zero for that point
Core Rule for Acceptable Observation Words
- Acceptable observation words must:
- Describe only what is seen, heard, or measured
- Avoid chemical identity
- Avoid explanation
- If a word implies why something happened:
- It is not acceptable as an observation
Colour Observation Words Accepted by Examiners
Accepted Colour Descriptors
- Colourless
- White
- Blue
- Green
- Yellow
- Brown
- Black
- Pale green
- Light blue
- Dark blue
Accepted Colour Change Phrases
- Turns blue
- Changes from colourless to blue
- Fades to colourless
- Becomes green
- Colour deepens
- Colour lightens
Unacceptable Colour Words (Inference)
- Copper(II)
- Iron(II)
- Iron(III)
- Nickel
- Transition metal ions
- Oxidised / reduced
Examiner-Approved Gas Observation Words
Accepted Gas Observation Terms
- Effervescence observed
- Bubbling occurs
- Gas is produced
- A colourless gas is evolved
- Rapid bubbling
- Gentle effervescence
What Examiners Reject for Gas Observations
- Carbon dioxide is produced
- Hydrogen gas is formed
- Oxygen gas is released
- Acid–carbonate reaction occurs
Gas Test Observation Language (Only Observations)
| Test | Acceptable Observation |
|---|---|
| Limewater | Turns milky |
| Burning splint | Pops |
| Glowing splint | Relights |
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Chemistry Full Scale Course
Examiner-Approved Precipitate Observation Words
Accepted Precipitate Descriptions
- A white precipitate forms
- A blue precipitate forms
- A green precipitate forms
- A yellow precipitate forms
- A gelatinous white precipitate forms
Accepted Structure for Precipitate Observations
- “A [colour] precipitate forms”
- “A [colour] solid is observed”
Unacceptable Precipitate Words (Inference)
- Insoluble salt forms
- Barium sulfate forms
- Lead(II) chloride precipitates
- Reaction produces a salt
Temperature Observation Words Accepted
Accepted Temperature Observation Terms
- Temperature increases
- Temperature decreases
- Temperature rises
- Temperature falls
- The solution becomes warm
- The solution becomes cool
Acceptable Measured Temperature Language
- Temperature increases from 25 °C to 32 °C
- Temperature decreases by 5 °C
Unacceptable Temperature Language
- Reaction is exothermic
- Energy is released
- Reaction absorbs heat
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Chemistry Full Scale Course
Physical Change Observation Words Accepted
Accepted Physical Observation Terms
- Solid dissolves
- Solid remains undissolved
- Solution becomes cloudy
- Solution becomes clear
- Solid forms
- Liquid level rises
- Liquid level falls
Unacceptable Physical Observation Words
- Neutralisation occurs
- Displacement reaction happens
- Decomposition occurs
- Precipitation reaction occurs
Sound-Based Observation Words
Accepted Sound Observations
- Popping sound
- Hissing sound
- Crackling sound
Examiner Notes on Sound Observations
- Sound observations are valid only when:
- Directly linked to a visible test
- Must still avoid:
- Naming the gas
Observation Words for Rate of Reaction Experiments
Accepted Rate Observation Phrases
- Faster bubbling
- Slower bubbling
- Rate increases
- Rate decreases
- Reaction finishes sooner
- Reaction takes longer
Unacceptable Rate Observation Language
- Reaction is faster due to higher kinetic energy
- Increased collision frequency
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Chemistry Full Scale Course
Observation Words in Results Tables
- Examiners expect:
- Short
- Neutral
- Descriptive entries
- Accepted examples:
- “White precipitate”
- “Colourless gas”
- “Temperature increase”
Common Observation Words That Lose Marks
- Produced
- Formed (when followed by chemical name)
- Indicates
- Shows that
- Suggests
Safe Observation Sentence Templates for Exams
- “A [colour] precipitate forms”
- “The solution changes from [colour] to [colour]”
- “Effervescence is observed”
- “The temperature increases”
Examiner Traps Related to Observation Vocabulary
- Using correct science with wrong wording
- Writing inference vocabulary too early
- Mixing observation and inference in one sentence
- Using reaction names instead of descriptions
How Examiners Mark Observation Vocabulary
- Correct observation word:
- Full mark
- Inference word used:
- Zero for that point
- Mixed sentence:
- Often zero
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Chemistry Full Scale Course
ATP-Focused Strategy for Observation Vocabulary
- Memorise:
- Examiner-approved words
- Avoid:
- Chemical names
- Reaction terms
- When unsure:
- Describe what you physically see
- Always:
- Match wording to command word
Core Scientific Principle
- Examiners do not test:
- What you know
- They test:
- What you can observe and record correctly
- Using correct observation vocabulary is:
- One of the highest-yield ATP skills