Download PDF by HOLT MCDOUGAL: Modern Chemistry: Student Edition 2012


ISBN-10: 0547586639

ISBN-13: 9780547586632

ISBN: 9780547586632

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Extra info for Modern Chemistry: Student Edition 2012

Sample text

Define physical property. b. List two examples of physical properties. 23. How can you tell the difference between an element and a compound? 24. Identify each of the following as either a physical change or a chemical change. Explain your answers. a. A piece of wood is sawed in half. b. Milk turns sour. c. Melted butter solidifies in the refrigerator. 25. Write a brief paragraph that shows that you understand the following terms and the relationships between them: atom, molecule, compound, and element.

Physical changes do not involve changes in identity of a substance. • The three major states of matter are solid, liquid, and gas. Changes of state, such as melting and boiling, are physical changes. • In a chemical change—or a chemical reaction—the identity of the substance changes. • Energy changes accompany physical and chemical changes. Energy may be released or absorbed, but it is neither created nor destroyed. Key Terms mass matter atom element compound extensive property intensive property physical property physical change change of state solid liquid • Matter can be classified into mixtures and pure substances.

2. Decide whether you think each statement is true or false. Discuss the reasons why you think so and write it all down. If someone disagrees with your conclusion, write down the reasons why. 3. After reading the section or listening to a lecture, re-evaluate your opinion of each statement. Discuss why your opinion changed or remained the same. Find passages in the text that account for the change of reinforcement of your opinions. For example, you might have agreed with all five statements from Dalton’s theory before reading the text.

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Modern Chemistry: Student Edition 2012 by HOLT MCDOUGAL

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