n by dividing by 100, then multiply by the total mass. This calculation earns the M1 mark."},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\htmlData{anchor=whole_conversion}{\\color{@sky}{0.2\\text{ kg}\\times1000\\text{ g kg}^{-1}}}"},{"latex":"\\htmlData{anchor=final_answer}{\\color{@green}{200\\text{ g}}}"}],"highlights":[{"color":"sky","style":"text-color-with-background","anchor":"whole_conversion"},{"color":"green","style":"text-color-with-background","anchor":"final_answer"}],"connections":[{"to":"final_answer","from":"whole_conversion","color":"sky","style":"solid"}]},"order":1,"title":"Convert kilograms to grams","description":"There are 1000 g in 1 kg, so multiply the mass in kilograms by 1000. The final answer, 200 g, earns the A1 mark."}]}],"generatedAt":"2026-07-21T04:32:08.112Z","modelVersion":"gpt-5.6-terra","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"312e709a-c508-459f-815e-0851947eb36f","revisionId":"c630fc3b-875f-4e5a-9e5c-d65ce3773ac4","questionNumber":null,"questionType":"LA","specification":"A laboratory simulation of the atmospheric conditions on early Earth uses a gas mixture containing methane ($CH_4$) and propene ($C_3H_6$).","difficulty":5,"difficultyBand":"medium","totalMarks":5,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"05eab914-9f8f-4d88-a2cc-12035ab969f7","label":"a","content":"Explain how methane, a greenhouse gas, acts to keep the simulated planetary surface warmer than it would be without an atmosphere. You should refer to radiation and wavelengths in your answer.","markscheme":"- Short-wavelength radiation (such as ultraviolet or visible light) passes through the greenhouse gases in the atmosphere to reach the surface M1\n- The surface absorbs this energy and re-emits it as longer-wavelength (infrared) radiation M1\n- Methane in the atmosphere absorbs this longer-wavelength radiation, trapping the thermal energy A1","marks":3,"order":0,"markingRubric":null,"explanation":null,"options":[]},{"id":"2e66a93b-d59f-4fae-bf7e-57690b452c02","label":"b","content":"Explain how a researcher could chemically confirm that propene is an unsaturated hydrocarbon. State the reagent used and the observation that would confirm this.","markscheme":"- Add bromine water (or aqueous bromine) to the sample M1\n- The bromine water changes from orange/brown to colourless (decolourises) A1","marks":2,"order":1,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_chemistry__aqa","summaries":[{"id":"044bb27e-2610-4611-bfbe-eaf167edc938","difficultyBand":"medium","calculatorUse":null},{"id":"0ba25a79-a361-49d2-93a7-00f8f78c834e","difficultyBand":"medium","calculatorUse":null},{"id":"312e709a-c508-459f-815e-0851947eb36f","difficultyBand":"medium","calculatorUse":null},{"id":"3697a53f-6b5d-4103-ab4b-70d57bdabe18","difficultyBand":"medium","calculatorUse":null},{"id":"39c3e78a-793b-457c-bf2a-2b4c3d8a1e95","difficultyBand":"medium","calculatorUse":null},{"id":"5edabfd0-3492-417c-a408-86b8dd764e00","difficultyBand":"medium","calculatorUse":null},{"id":"7c147150-d9fb-453c-9627-e3ac5c606ca3","difficultyBand":"easy","calculatorUse":null},{"id":"8318fa3d-2e09-469f-98ac-8817942649c1","difficultyBand":"medium","calculatorUse":null},{"id":"86050c91-7790-4681-96b2-a16b7ef42dbf","difficultyBand":"medium","calculatorUse":null},{"id":"9f381f1b-2c6a-45e6-9494-ad5b809877d7","difficultyBand":"medium","calculatorUse":null},{"id":"aec47b28-a426-4607-8b91-b1915baf3d2c","difficultyBand":"medium","calculatorUse":null},{"id":"dd89ba95-96c8-4265-bf4e-51c5f88e5faf","difficultyBand":"easy","calculatorUse":null},{"id":"f36121cf-af67-4208-98d2-f0020f1cda63","difficultyBand":"medium","calculatorUse":null}],"title":"Carbon dioxide and methane as greenhouse gases","topicId":"a246af76-0b46-5a90-8f28-90174283705f","topicSidebar":"$L40","topicSlug":"carbon-dioxide-and-methane-as-greenhouse-gases","topicTitle":"C

Carbon dioxide and methane as greenhouse gases

Question 2

Carbon dioxide and methane as greenhouse gases Questions

Carbon dioxide and methane as greenhouse gases

Question 2

Carbon dioxide and methane as greenhouse gases Questions