Please enter your email: 1.Which substance does not require oxygen in order to produce energy? A. coal B. hydrogen C. natural gas D. 235U 2.The diagram shows a simple laboratory apparatus for the preparation and collection of a dry gas. What is the gas? A. carbon dioxide B. chlorine C. hydrogen D. hydrogen chloride 3.Which substances react together to give hydrogen? A calcium oxide and water B copper and dilute sulfuric acid C copper and steam D magnesium and steam 4.Why are some weather balloons filled with helium rather than hydrogen? A Helium is found in air. B Helium is less dense than hydrogen. C Helium is more dense than hydrogen. D Helium is unreactive 5.The diagram shows a method for displacing a metal from its oxide. Which metal can be displaced from its oxide by using this method? A calcium B copper C magnesium D potassium 6.In which industrial process is the presence of water not essential? A the electrolytic purification of copper B the production of ethanol from ethene C the production of ethanol by fermentation D the production of iron in the Blast Furnace 7.The diagram shows stages in the purification of water.Which stage uses chlorine? A B C D 8.A student is asked to measure the time taken for 4.00 g of magnesium carbonate to react completely with 25.0 cm 3 (an excess) of dilute hydrochloric acid.Which pieces of apparatus does the student need? A. balance, clock, pipette B. balance, clock, thermometer C. balance, pipette, thermometer D. clock, pipette, thermometer 9.A student was provided with only a thermometer, a stopwatch and a beaker.What could the student measure? A. 10.5 g solid and 24.8 cm3 liquid B. 10.5 g solid and 25 ‹C C. 24.8 cm3 liquid and 45 seconds D. 25 ‹C and 45 seconds 10.Chromatography and fractional distillation can be used to separate compounds. In which type of separation is a thermometer needed for checking that complete separation has occurred? A chromatographic separation of two colourless solids B chromatographic separation of two solids of different colours C fractional distillation of two colourless liquids D fractional distillation of two liquids of different colours Loading … Question 1 of 10