1) What gas made the limewater go cloudy? a) carbon monoxide b) carbon dioxide c) hydrogen d) Calcium chloride 2) ZnCO3 → ????? + CO2 a) ZnO2 b) ZNO c) ZnO d) ZnCO 3) What the definition for an exothermic reaction a) A reaction that gains energy from the surroundings b) A reaction that releases gas to the surroundings c) A reaction that produced carbon dioxide d) A reaction that releases energy to the surroundings 4) Whats the definition of a endothermic reaction a) A reaction that releases energy to the surroundings b) A reaction that takes in energy from the surroundings c) A reaction that causes fire d) A reaction that has no energy 5) Whats a controlled variable  a) A variable that is changed durning an experiment b) a variable that is kept the same during a scientific experiment. c) A variable which is being tested 6) What is thermal decomposition? a) Breaking down a compound using heat b) Cooling a compound to release energy 7) What is needed for thermal decomposition? a) A cold temperature b) heat 8) what substance is used to test for limewater? a) Bromine water b) Carbon dioxide c) A lit splint 9) The law of conservation of mass states that.. a) The mass of reactants is equal to the mass of products b) The mass of reactants is less than the mass of product c) The mass of reactants is greater than the mass of products 10) An example of an exothermic reaction is: a) Photosynthesis b) A cold pack c) Burning a candle 11) An example of an endothermic reaction is: a) Photosynthesis b) A cold pack c) Burning a candle 12) Conduction takes place in... a) solids b) liquids and gases c) All states 13) Convection takes place in.. a) solids b) Liquids and gases c) All of the above 14) Radiation is .. a) a transverse wave b) A longitudinal wave 15) Thermal equilibrium is reached when  a) The temperature of one substance is equal to the surroundings b) When the temperature of a substance decreases c) When the temperature of a material increases

Thermal decomposition modified

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