Air quality topic check
Test G2 Chemistry air composition, pollutant sources, acid rain, the carbon cycle and greenhouse gases, with feedback and targeted practice.
Learning goals
- Describe the composition of dry air by volume: about 78% nitrogen, 21% oxygen and the rest noble gases, mainly argon, and carbon dioxide
- Name common air pollutants, such as carbon monoxide, methane, nitrogen oxides, ozone, sulfur dioxide and unburned hydrocarbons
- State that carbon monoxide comes from incomplete combustion of carbon-containing substances
- State that nitrogen oxides come from lightning and internal combustion engines
- State that sulfur dioxide comes from volcanoes and burning fossil fuels
- Discuss why carbon monoxide is toxic
- Discuss how nitrogen dioxide and sulfur dioxide form acid rain and its effects on breathing and buildings
- Describe how combustion, respiration and photosynthesis move carbon in the carbon cycle
- Describe how the carbon cycle regulates the amount of carbon dioxide in the atmosphere
- State that carbon dioxide and methane are greenhouse gases, give their sources, and describe the possible effects of rising levels, such as extreme weather and melting polar ice
Your next step
Check what you know
Answer each question and say how sure you are to find what to practise next.
Finding your next step…
Check what you know
Start here to see which parts you already know.
About 8 minutes
Time is up and your answers could not be submitted; check your connection and try again.
Paper instructions
This shows what to work on next and doesn’t count towards your course progress.
- Question count is checked before you start.
- Feedback appears after you finish and submit.
Your work
Without an account, unfinished answers stay in this tab. Signed in, they are saved on this device until the deadline shown when you start.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Practise
Practise questions on the skills you are learning.
About 10 minutes
Use the feedback to improve your answers; this practice does not count towards your progress.
Time is up and your answers could not be submitted; check your connection and try again.
Paper instructions
This is for practice only and doesn’t count towards your course progress.
- Question count is checked before you start.
- Feedback appears after you check each answer.
Your work
Without an account, unfinished answers stay in this tab. Signed in, they are saved on this device until the deadline shown when you start.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Practise after feedback
After a check, practise the skills it showed you need to work on.
About 10 minutes
Use the feedback to improve your answers; this practice does not count towards your progress.
Time is up and your answers could not be submitted; check your connection and try again.
Paper instructions
This is for practice only and doesn’t count towards your course progress.
- Question count is checked before you start.
- Feedback appears after you check each answer.
Your work
Without an account, unfinished answers stay in this tab. Signed in, they are saved on this device until the deadline shown when you start.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Check your progress
When you feel ready, answer on your own to show what you can do.
About 10 minutes
Use the feedback to improve your answers; this practice does not count towards your progress.
Time is up and your answers could not be submitted; check your connection and try again.
Paper instructions
Your result can count towards your course progress.
- Question count is checked before you start.
- Feedback appears after you finish and submit.
Your work
Without an account, unfinished answers stay in this tab. Signed in, they are saved on this device until the deadline shown when you start.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Check again
After practising what your progress check showed, check those skills again.
About 10 minutes
Use the feedback to improve your answers; this practice does not count towards your progress.
Time is up and your answers could not be submitted; check your connection and try again.
Paper instructions
Your result can count towards your course progress.
- Question count is checked before you start.
- Feedback appears after you finish and submit.
Your work
Without an account, unfinished answers stay in this tab. Signed in, they are saved on this device until the deadline shown when you start.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Review
Come back later to see whether your learning has lasted.
About 10 minutes
Use the feedback to improve your answers; this practice does not count towards your progress.
Time is up and your answers could not be submitted; check your connection and try again.
Paper instructions
A scheduled review counts towards your course progress only when it is due.
- Question count is checked before you start.
- Feedback appears after you finish and submit.
Your work
Without an account, unfinished answers stay in this tab. Signed in, they are saved on this device until the deadline shown when you start.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Practise: multiple-choice
Practise questions on the skills you are learning.
About 10 minutes
Use the feedback to improve your answers; this practice does not count towards your progress.
Time is up and your answers could not be submitted; check your connection and try again.
Paper instructions
This is for practice only and doesn’t count towards your course progress.
- Question count is checked before you start.
- Feedback appears after you check each answer.
Your work
Without an account, unfinished answers stay in this tab. Signed in, they are saved on this device until the deadline shown when you start.
Practice settings
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Practise: written
Practise questions on the skills you are learning.
About 10 minutes
Use the feedback to improve your answers; this practice does not count towards your progress.
Time is up and your answers could not be submitted; check your connection and try again.
Paper instructions
This is for practice only and doesn’t count towards your course progress.
- Question count is checked before you start.
- Feedback appears after you check each answer.
Your work
Without an account, unfinished answers stay in this tab. Signed in, they are saved on this device until the deadline shown when you start.
Practice settings
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Next step