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Exam (elaborations)
A level OCR Chemistry Mark Scheme 2023-2024
Hey are scientists concerned about the release of methane gas? --CORRECT ANSWER: 1. 
Methanol contributes to global warming 
Suggest a modification to this experiment, using the same apparatus, which would reduce the 
percentage error in the measurements. Explain your reasoning. --CORRECT ANSWER: 1. Use 
a greater mass of Na2O 
2. Larger temperature change to reduce percentage uncertainty 
The chemist finds the value of Kp is greater when the experiment is repeated at a different 
temperatur...
Exam (elaborations)
A Level OCR Chemistry Module 4 (A+ GRADED)
PopularAlkane correct answers All bonds are full so it is saturated 
Covalently bonded 
 
Alkane formula correct answers CnH2n+2 
 
Alkene correct answers More reactive 
Double bonded carbons 
Unsaturated (mono) 
 
Alkene formula correct answers CnH2n 
 
Making fuel (complete combustion equation) correct answers fuel + O2 >>>>> CO2 + H2O 
 
Making fuel (incomplete combustion equation) correct answers fuel + O2 >>>>> CO + H2O 
 
Making fuel (really incomplete combustion equ...
Package deal
OCR Chemistry A-Level - Modules 1-4 (A+ GRADED)
Module 4 Core Organic Chemistry (AS Chemistry OCR A) CORRECTLY ANSWERED
OCR A-level Chemistry (Test questions with error-free answers)
Module 4 Core Organic Chemistry (AS Chemistry OCR A) CORRECTLY ANSWERED