4. Chemistry is the study of the composition , structure , and properties of matter and the changes it undergoes – such as burning fuels. C 2 H 5 OH + 3 O 2 2 CO 2 + 3 H 2 O + Energy Reactants Products
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18. - Page 16 88.2% 440,000 After lead was banned in gasoline and public water supply systems, less lead entered the environment. Let’s examine some information from a graph.
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31. - Page 22 Using your senses to obtain information Hypothesis is a proposed explanation; should be based on previous knowledge; an “educated” guess The procedure that is used to test the hypothesis A well-tested explanation for the observations; cannot be proven due to new discoveries Tells what happened