Science A, Combined (9-1) - Gateway Science Suite J250 9-1: C6: Global challenges Topical Past Paper Questions
OCR GCSE (9-1) Science A, Combined (9-1) - Gateway Science Suite J250 (9-1) past-paper questions on C6: Global challenges, free. This topic is frequently examined across 6 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
The amount of carbon dioxide in the Earth's atmosphere has changed over time. (a) What is the percentage of carbon dioxide found in the Earth's atmosphere today? (b) Most scientists think that the amount of carbon dioxide in the Earth's atmosphere is being increased by human acti…
Copper can be extracted from its compounds by different processes. (a) Process 1 - Copper is extracted from copper oxide, CuO. - The copper is extracted by heating copper oxide with carbon. This is the equation for the reaction in Process 1. 2CuO(s) + C(s) → 2Cu(s) + CO₂(g) (i) E…
Phytoextraction is a method of producing metals such as copper using plants which are harvested and burnt to produce an ash. (a) The ash is reacted with sulfuric acid to produce a solution of copper(II) sulfate. Copper can be extracted by adding iron to the solution of copper(III…
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