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) What is the definition of oxidation  a) The loss of oxygen, or gain of electrons, by a substance during a chemical reaction. b) The gain of oxygen and carbon   c) The gain of oxygen, or loss of electrons, by a substance during a chemical reaction. d) The gain of oxygen, or loss of electrons, by a substance during a chemical reaction. 6) 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

Thermal decomposition

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