2SAS #1-12 pg. 130

1. a) physical property b) chemical property c) chemical property d) physical property

2. a) physical property b) physical property c) physical property d) chemical property

3. a) chemical property b) chemical property c) chemical property d) physical property

4. a) chemical property b) chemical property c) chemical property d) chemical property

5. a) A cut apple left out in the air turns brown because of the exposure to oxygen which creates a chemical reaction, displaying a chemical property b) Flashlight batteries lose their "charge" after extended use because they can no longer be used to facilitate use and have created a chemical property c) Dry cleaning removes oils from clothing because it is a nonpolar substance combining with oil a nonpolar substance creating a chemical reaction and making it a chemical property d) Italian salad dressing separates over time because it is a suspension and is not homogeneously mixed so chemically will separate displaying another chemical property

6. a) When making chocolate chip cookies one must get all the ingredients, mix them together to form a dough, let them set in the refrigerator, put them on a baking sheet, put them in the oven, let them cool.
b) Mixing the ingredients is a chemical change because it is creating a reaction with all the ingredients to form a new substance; the dough. Letting the dough set in the refrigerator is physical property because the dough become firmer. Putting them in a shape on the baking sheet is a physical property because the dough stays the same in a different shape. Baking them in the oven is a chemical property because the substance didn't change but it cooked because the heat allowed the cookies to get harder.

7. a) metal b) nonmetal c) nonmetal d) metal

8. a) metal b) metalloid c) nonmetal d) metal

9. Boron- B, Silicon-Si

10. a) Because Iodine is a nonmetal, it should shatter into pieces and be brittle b) Zirconium would bend and be maleable because it is a metal c) phosphorus would shatter and be brittle because it is a nonmetal d) nickel would bend and be maleable because it is a metal

11. Nonmetals are non electrically conductive and they also shatter easily into small pieces and cannot bend to fit around small areas and into smaller wires.

12. Metals are good for coins because faces such as Abraham Lincoln's on the penny can be printed on to them easily because they bend, metals also can last a long time, and they also are cost effective while still being good quality.