1. Chapter 2 Atoms: Are They for Real? James A. Noblet California State University San Bernardino, CA  2007 Prentice Hall Chemistry for Changing Times, 11 th edition John W. Hill and Doris K. Kolb

2. The term atom comes from the Greek word atomos, which means: 1.Very small 2.Cannot be seen 3.Cannot be cut 4.Basis 5.Reactive

3. The term atom comes from the Greek word atomos, which means: 1.Very small 2.Cannot be seen 3.Cannot be cut 4.Basis 5.Reactive

4. The fact that 4g of hydrogen (H 2 ) reacts with 32g of oxygen (O 2 ) to give 36g of water is an illustration of what law? 1.Conservation of mass 2.Law of definite proportions 3.Law of multiple proportions 4.Law of combining elements 5.The periodic law

5. The fact that 4g of hydrogen (H 2 ) reacts with 32g of oxygen (O 2 ) to give 36g of water is an illustration of what law? 1.Conservation of mass 2.Law of definite proportions 3.Law of multiple proportions 4.Law of combining elements 5.The periodic law

6. The tarnish on silverware is primarily silver sulfide, which always forms with a 2:1 ratio of Ag to S. This an example of what principle? 1.Conservation of mass 2.Law of definite proportions 3.Law of multiple proportions 4.Law of combining elements 5.The periodic law

7. The tarnish on silverware is primarily silver sulfide, which always forms with a 2:1 ratio of Ag to S. This an example of what principle? 1.Conservation of mass 2.Law of definite proportions 3.Law of multiple proportions 4.Law of combining elements 5.The periodic law

8. Carbon and oxygen can react to form carbon monoxide (CO) or carbon dioxide (CO 2 ) depending on the amount of oxygen available. This illustrates which law? 1.Conservation of mass 2.Law of definite proportions 3.Law of multiple proportions 4.Law of combining elements 5.The periodic law

9. Carbon and oxygen can react to form carbon monoxide (CO) or carbon dioxide (CO 2 ) depending on the amount of oxygen available. This illustrates which law? 1.Conservation of mass 2.Law of definite proportions 3.Law of multiple proportions 4.Law of combining elements 5.The periodic law

10. Mendeleev arranged the elements in his early periodic table primarily according to what criterion? 1.Similar physical properties 2.Similar chemical properties 3.Decreasing atomic masses 4.Similar appearance 5.Natural abundance

11. Mendeleev arranged the elements in his early periodic table primarily according to what criterion? 1.Similar physical properties 2.Similar chemical properties 3.Decreasing atomic masses 4.Similar appearance 5.Natural abundance