Science A, Combined (9-1) - Gateway Science Suite J250 9-1: C3: Chemical reactions Topical Past Paper Questions
OCR GCSE (9-1) Science A, Combined (9-1) - Gateway Science Suite J250 (9-1) past-paper questions on C3: Chemical reactions, 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 diagram shows a reaction between two solutions P and Q. P Q R R ཕུཿཀུ (a) Write the formula of the molecules in the box for R to show a balanced reaction. [2] (b) Write the name and the formula of the compound in solution S. Name ..... Formula ..... (c) Name the type of react…
Iodine is an element in Group 7 of the Periodic Table. Seaweed has small amounts of compounds containing iodine. It is possible to extract iodine from seaweed. The diagram shows the stages in the extraction of iodine. (d) 0.13 g of iodine is produced from 5.0 g of seaweed. Calcul…
The mole is a unit of measurement used in chemistry for the amount of a substance. (a) Define the term mole. [2] (b) Iron, Fe, reacts with steam, H_{2}O. An oxide of iron and hydrogen, H_{2}, are made. The oxide of iron has the formula $ Fe_{x}O_{v} $ where x and y are whole numb…
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