What happens in an exothermic reaction?, Thermal energy exits - the temperature of the surroundings increases, the internal energy of the products is less than the reactants., What happens in an endothermic reaction?, Thermal energy enters - the temperature of the surroundings decreases, the internal energy of the products is more than the reactants., Two examples of endothermic reactions, Thermal decomposition, photosynthesis, Four examples of exothermic reactions, Combustion, displacement, neutralisation, respiration, What is the test for carbon dioxide?, Lime water turns from colourless and clear to cloudy, What is the law of conservation of mass?, Atoms are not created or destroyed so the mass of the reactants = the mass of the products, What is combustion?, Burning a fuel in oxygen to produce carbon dioxide and water., What is thermal decomposition?, Breaking down a substance using heat

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