Ch.2 Review Ques - 2.4 What are two ways to interpret a...

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2.4 – What are two ways to interpret a chemical symbol? 2.5 – Epsom salts is a hydrate of magnesium sulfate, MgSO 4 *7H 2 O. What is the formula of the substance that remains Epsom salts is completely dehydrated? 2.6 – What do we mean when we say a chemical equation sis balanced? Why do we balance chemical equations? 2.15 – What is chemical energy? 2.19 – State the law of conservation of energy. When a ball rolls down a hill, what happens to its potential energy? What happens to its kinetic energy? Are these observations consistent with the law of conservation of energy? 2.22 – If during a chemical reaction there is a reduction in the total amount of chemical energy, what happens to the temperature of the reacting chemicals? Why? 2.24 – When gasoline burns, it reacts with oxygen in the air and forms hot gases consisting of carbon dioxide and water vapor. How does the potential energy of the gasoline and oxygen compare with the potential energy of the carbon dioxide and water vapor?
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