Chemistry B (9-1) - Twenty First Century Science Suite J258 9-1: Air and water Topical Past Paper Questions
OCR GCSE (9-1) Chemistry B (9-1) - Twenty First Century Science Suite J258 (9-1) past-paper questions on Air and water, free. This topic is frequently examined across 6 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
Scientists collect data to explain how the Earth's atmosphere formed. The graph shows how the percentages of some gases in the atmosphere have changed since 4400 million years ago. Percentage of each gas in the atmosphere Scientists also study the composition of gases that come o…
A three-dimensional model for solid sodium chloride is shown in Fig. 9.1. Fig. 9.1 (a) Draw a two-dimensional diagram to show the arrangement of ions in sodium chloride. Use these symbols. Show at least eight ions. [2] (b) Explain why the model shown in Fig. 9.1 cannot be used to…
Some diesel cars have a system which uses a solution of urea, $ (NH_{2})_{2}CO $, to remove nitrogen oxides from their exhaust gases. (a) Urea solution reacts in a two stage process. Stage 1: At temperatures above $ 100^{\circ} $C, urea solution breaks down to make ammonia. $$ (\…
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