1) Which of the following metals reacts most vigorously with water? a) sodium b) iron c) zinc d) copper 2) Which metal will react with oxygen to form a white powder? a) silver b) magnesium c) gold d) copper 3) When calcium reacts with water, which gas is produced? a) Oxygen b) Carbon dioxide c) Hydrogen d) Nitrogen 4) Which of these metals does not react with water at room temperature? a) potassium b) calcium c) magnesium d) gold 5) Which metal reacts with dilute hydrochloric acid to produce hydrogen gas and a salt? a) silver b) zinc c) gold d) copper 6) Which of the following metals is least reactive with oxygen? a) iron b) lithium c) copper d) sliver 7) What is the product formed when iron reacts with oxygen and water? a) iron oxide (rust) b) iron carbonate c) iron chloride d) iron sulfate 8) Which of the following is an example of an exothermic process? a) Burning of natural gas b) Melting of ice c) Dissolving ammonium nitrate in water d) Photosynthesis 9) What happens to the temperature of the surroundings during an exothermic reaction? a) decreases b) increases c) stays the same d) fluctuates (goes up and down) 10) Which of these processes is exothermic? a) Boiling water b) Freezing water c) Evaporating alcohol d) Melting ice 11) When a chemical hand warmer is activated, it releases heat. This is an example of: a) An endothermic reaction b) An exothermic reaction c) A physical change d) A neutralization reaction 12) Which of the following reactions is exothermic? a) Dissolving potassium chloride in water b) Combustion of coal c) Electrolysis of water d) Photosynthesis in plants 13) Which type of reaction releases more energy than it absorbs? a) Exothermic b) Endothermic c) Both absorb the same amount of energy d) Neither absorbs energy 14) When magnesium burns in air, it produces a bright white flame and releases heat. This is an example of: a) An exothermic reaction b) An endothermic reaction c) A physical change d) A condensation reaction 15) All exothermic and endothermic processes are chemical reactions a) TRUE b) FALSE 16) Which of these is an exothermic process that is NOT a chemical reaction? a) burning paper b) freezing melted ice cream c) neutralising hydrochloric acid with sodium hydroxide d) mixing sugar with strong sulfuric acid 17) Which of the following is an example of an endothermic process? a) Melting ice b) Burning wood c) Freezing water d) Combustion of gasoline 18) What happens to the temperature of the surroundings during an endothermic reaction? a) Increases b) Decreases c) Stays the same d) Fluctuates 19) Which of the following reactions absorbs energy from the surroundings? a) Combustion of methane b) Neutralization between an acid and a base c) Electrolysis of water d) Freezing of water 20) In an endothermic reaction, the energy absorbed by the reaction comes from: a) The surroundings b) The reactants c) The products d) The container

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