Global dimming Study guides, Class notes & Summaries
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ESS IB Final Exam Review
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greenhouse gas - Answer- a gas that contributes to the greenhouse effect by absorbing infrared radiation such as CFC's and carbon dioxide (unlike non greenhouse gases) Any gas that traps radiation in the Earth's atmosphere is a GHG. 
 
5 major greenhouse gases - Answer- -carbon dioxide 
-nitrous oxides 
-Tropospheric ozone 
-Chlorofluorocarbons (CFCs) 
-methane 
 
IPCC (Intergovernmental Panel on Climate Change) - Answer- a scientific body under the United Nations. It reviews and assesses the ...
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2023.
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2023. CH4 + 2 O2 → CO2 + 2 H2O 1 AO2 
5.7.1.3 
Question Answers Extra information Mark AO / 
Spec. Ref. 
01.2 
hydrocarbon molecules in petrol 
have fewer carbon atoms than 
those in diesel 
petrol has a lower boiling point 
(range) than diesel 
allow converse throughout 
allow petrol is more flammable 
than diesel 
allow petrol is less viscous than 
diesel 
1 
1 
AO3 
5.7.1.3 
Question Answers Extra information M...
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2023.
- Exam (elaborations) • 19 pages • 2024
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2023. CH4 + 2 O2 → CO2 + 2 H2O 1 AO2 
5.7.1.3 
Question Answers Extra information Mark AO / 
Spec. Ref. 
01.2 
hydrocarbon molecules in petrol 
have fewer carbon atoms than 
those in diesel 
petrol has a lower boiling point 
(range) than diesel 
allow converse throughout 
allow petrol is more flammable 
than diesel 
allow petrol is less viscous than 
diesel 
1 
1 
AO3 
5.7.1.3 
Question Answers Extra information M...
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2023
- Exam (elaborations) • 19 pages • 2024
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2023. CH4 + 2 O2 → CO2 + 2 H2O 1 AO2 
5.7.1.3 
Question Answers Extra information Mark AO / 
Spec. Ref. 
01.2 
hydrocarbon molecules in petrol 
have fewer carbon atoms than 
those in diesel 
petrol has a lower boiling point 
(range) than diesel 
allow converse throughout 
allow petrol is more flammable 
than diesel 
allow petrol is less viscous than 
diesel 
1 
1 
AO3 
5.7.1.3 
Question Answers Extra information M...
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2023.
- Exam (elaborations) • 19 pages • 2024
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- $13.99
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2023. CH4 + 2 O2 → CO2 + 2 H2O 1 AO2 
5.7.1.3 
Question Answers Extra information Mark AO / 
Spec. Ref. 
01.2 
hydrocarbon molecules in petrol 
have fewer carbon atoms than 
those in diesel 
petrol has a lower boiling point 
(range) than diesel 
allow converse throughout 
allow petrol is more flammable 
than diesel 
allow petrol is less viscous than 
diesel 
1 
1 
AO3 
5.7.1.3 
Question Answers Extra information M...
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AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Mark Scheme June 2022
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AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Mark Scheme June 2022. use of oil has decreased by 
0.8% 
or 
use of oil has decreased from 
1.3% to 0.5% 
use of solar energy has 
increased by 3.4% 
or 
use of solar energy has 
increased from 0% to 3.4% 
any one from: 
• use of oil increased from 2007 
to 2009 
• no change in oil use between 
2013 and 2015 
• no change in solar energy use 
between 2007 and 2009 
• use of solar energy increased 
most between 2013 and 2015 
• between 2007...
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ESS IB Final Exam Review 2023 with complete solution
- Exam (elaborations) • 17 pages • 2023
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ESS IB Final Exam Review 2023 with complete solution
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GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier[DOWNLOAD TO PASS]
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MARK SCHEME – GCSE CHEMISTRY – 8462/2H – JUNE 2021 
6 
Step 1: Determine a level 
Start at the lowest level of the mark scheme and use it as a ladder to see whether the answer meets the descriptor for that level. The descriptor for the level indicates the different qualities that might be seen in the student’s answer for that level. If it meets the lowest level then go to the next one and decide if it meets this level, and so on, until you have a match between the level descriptor and th...
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AQA Chemistry - Organic Chemistry Question 	With 100% Correct Answers
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AQA Chemistry - Organic Chemistry Question 	With 100% Correct Answers 
 
How is crude oil formed? - ANSWER Over millions of years from the fossilised remains of plankton 
 
Where is crude oil found? - ANSWER In the porous rocks in the Earth's crust 
 
Is crude oil renewable or non-renewable? - ANSWER Non-renewable 
 
What is crude oil made up of? - ANSWER Hydrocarbons 
 
What give...
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GCSE PHYSICS 8463/1H Paper 1 Higher Tier
- Exam (elaborations) • 23 pages • 2023
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AQA 
GCSE 
PHYSICS 
8463/1H 
Paper 1 Higher Tier 
Question 1 
 
 
Question	 
Answers	 
Extra information	 
Mark	AO / Spec. Ref. 
01.1	ammeter and voltmeter symbols correct 
voltmeter in parallel with lamp ammeter in series with lamp		1 
 
 
1 
 
1	AO1 4.2.1.1 
RPA 4 
01.2	smooth curved line of correct shape 
 
 
passing through - 4.0 V, - 0.2 A 
or 
– 6.0 V, - 0.23 A 
 
 
 
	do not accept a line that becomes horizontal 
 
 
2nd mark conditional on scoring 1st mark	1 
 
 
1	AO2 4.2.1.4 
RPA 4 ...
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