1. Properties and Changes in Matter Extensive properties depend on the amount of matter that is present. volume mass the amount of energy in a substance. Section 2 Matter and Its Properties Chapter 1

2. Properties and Changes in Matter Intensive properties do not depend on the amount of matter present. melting point boiling point density ability to conduct electricity ability to transfer energy as heat Section 2 Matter and Its Properties Chapter 1

3. Click below to watch the Visual Concept. Visual Concept Chapter 1 Comparing Extensive and Intensive Properties Section 2 Matter and Its Properties

4. Physical Properties and Physical Changes A physical property is a characteristic that can be observed or measured without changing the identity of the substance. melting point and boiling point A physical change is a change in a substance that does not involve a change in the identity of the substance. grinding, cutting, melting, and boiling Section 2 Matter and Its Properties Chapter 1

5. Chemical Properties and Chemical Changes A chemical property relates to a substance’s ability to undergo changes that transform it into different substances A change in which one or more substances are converted into different substances is called a chemical change or chemical reaction. Section 2 Matter and Its Properties Chapter 1

6. Chemical Properties and Chemical Changes, continued The products are the substances that are formed by the chemical change. Section 2 Matter and Its Properties Chapter 1 reactants product The reactants are the substances that react in a chemical change. Carbon plus oxygen yields (or forms) carbon dioxide. carbon + oxygen carbon dioxide

7. Evidence of a Chemical Change Section 2 Matter and Its Properties Chapter 1

8. Section 3 Elements Chapter 1 Regions of the Periodic Table

9. Introduction to the Periodic Table The vertical columns of the periodic table are called groups, or families. Each group contains elements with similar chemical properties. The horizontal rows of elements in the periodic table are called periods. Physical and chemical properties change somewhat regularly across a period. Section 3 Elements Chapter 1

10. Types of Elements Metals A metal is an element that is a good electrical conductor and a good heat conductor. Properties of metals most are solids at room temperature malleable - they can be hammered or rolled into thin sheets ductile - they can be drawn into a fine wire conduct electricity and heat well Section 3 Elements Chapter 1

11. Types of Elements Gold, copper, and aluminum are metals Section 3 Elements Chapter 1

12. Types of Elements Nonmetals A nonmetal is an element that is a poor conductor of heat and electricity. Properties of nonmetals many are gases solids are brittle poor conductors of heat and electricity Section 3 Elements Chapter 1

13. Types of Elements Various nonmetal elements (a) carbon, (b) sulfur, (c) phosphorus, and (d) iodine Section 3 Elements Chapter 1

14. Types of Elements Metalloids A metalloid is an element that has some characteristics of metals and some characteristics of nonmetals. Properties of metalloids all metalloids are solids at room temperature semiconductors of electricity Section 3 Elements Chapter 1

15. Types of Elements Noble Gases Section 3 Elements Chapter 1 elements in Group 18 of the periodic table generally unreactive gases at room temperature

16. Short Answer 11. In trying to identify a sample of a pure substance, we observe the following properties. Tell whether each one is a chemical property or a physical property. A. Its mass is 124.3 g. B. It is a shiny solid at room temperature. C. It is easily etched by nitric acid. D. It melts when heated to 670°C. E. It is 31.7 centimeters long. F. It is a good heat conductor. G. It burns in air. H. It is a good conductor of electrical energy. Standardized Test Preparation Chapter 1

17. 11. In trying to identify a sample of a pure substance, we observe the following properties. Tell whether each one is a chemical property or a physical property. A. Its mass is 124.3 g. physical property B. It is a shiny solid at room temperature. physical property C. It is easily etched by nitric acid. chemical property D. It melts when heated to 670°C. physical property E. It is 31.7 centimeters long. physical property F. It is a good heat conductor. physical property G. It burns in air. chemical property H. It is a good conductor of electrical energy. physical property Short Answer Standardized Test Preparation Chapter 1

18. Extended Response Standardized Test Preparation Chapter 1 13. Describe general properties of metals, nonmetals, and metalloids.

19. Answer: metals: shiny; good conductors of heat; good conductors of electricity; malleable or ductile; most are solids at room temperature nonmetals: poor conductors of heat; poor conductors of electricity; many are gases at room temperature; those that are solids are brittle rather than malleable or ductile metalloids: properties intermediate between those of metals and nonmetals; less malleable than metals but not as brittle as solid nonmetals; most are semiconductors of electricity Standardized Test Preparation Chapter 1 Extended Response