Free WJEC GCSE Chemistry (3410) Exam Questions and Answers

The diagrams show four methods, A, B, C and D, used to separate different mixtures. Choose from the box the names of methods B and D. distillation chromatography filtration evaporation boiling Method B ____ Method D ____

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The diagrams show four methods, A, B, C and D, used to separate different mixtures. Give the letter, A, B, C or D, of the method used to remove sand from water ____ obtain pure water from sea water ____ separate red and yellow dyes ____

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Atoms contain particles called protons, neutrons and electrons. The diagram shows a model of an atom of boron. State whether the statements in the table below are true or false. | Statement | True or false? | | Boron atoms contain the same number of protons and electrons | ____ | | The particles found in the shells are called electrons | ____ | | The nucleus contains five neutrons | ____ | | The electronic structure of boron is 3,2 | ____ |

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The formula of boron trioxide is B₂O₃. Calculate the relative formula mass (Mᵣ) of boron trioxide. Aᵣ(B) = 11 Aᵣ(O) = 16 Relative formula mass = ____

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The diagrams below represent atoms of boron and fluorine. boron, B (large black circle) fluorine, F (small white circle) Boron trifluoride has the formula BF₃. Choose the letter of the diagram that represents a molecule of boron trifluoride. Letter ____

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Magnesium fluoride contains the ions Mg²⁺ and F⁻. Underline the correct formula for magnesium fluoride.

• AA. Mg2F
• BB. Mg₂F
• CC. MgF²
• DD. MgF₂

The diagram below shows the position of the Earth’s continents today. In 1912 Alfred Wegener suggested that all the continents must once have been joined together as one big land mass. Diagrams A, B and C show the position of the Earth’s continents 50 million, 100 million and 150 million years ago, but not necessarily in that order. Give the letter, A, B or C, of the diagram which shows the position of the Earth’s continents 150 million years ago.

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Wegener’s theory of continental drift was not accepted by other scientists until several years after his death in 1930. The evidence to support his theory was found in 1960 when part of the ocean floor was surveyed around a plate boundary. The table shows data collected from the survey. | Distance of ocean floor from plate boundary (km) | Approximate age of rock (million years) | | 2000 | 100 | Calculate the mean speed at which the ocean floor is spreading. mean speed (km/million years) = distance (km) / time (million years) Mean speed = ____ km/million years

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The map shows some information about tectonic plates and three locations X, Y and Z. Give the letter of the location you would expect to have earthquakes but not volcanic eruptions.

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Dilute hydrochloric acid reacts with magnesium forming magnesium chloride and hydrogen gas. Tick (✓) the box next to the correct equation for the reaction between magnesium and hydrochloric acid.

• AA. Mg + HCl → MgCl₂ + H
• BB. Mg + 2HCl → MgCl₂ + 2H
• CC. Mg + 2HCl → MgCl₂ + H₂