p. 130, #1-12

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

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

3.
a: chemical change
b: chemical change
c: physical change
d: physical change

4.
a: chemical change
b: physical change
c: chemical change
d: physical change

5.
a: It is a chemical change because it is a change in color.
b: In order for the battery to lose charge, a chemical reaction did not have to take place. The battery is still the same substance, it just doesn't have the charge anymore.
c: The oil stain is removed by a chemical reaction between the soap/stain remover and the oil on the clothing. Two non-polar substances must be used in order for the stain to go away.
d: The salad dressing naturally separates over time but it is not due to a chemical reaction and even after it has separated, it is still salad dressing.

6.
a: 1. Gathering the ingredients and tools needed to make the cookies 2. mixing the dough together 3. rolling the dough into balls and putting it on the tray 4. cooking the dough in the oven
b: 1 and 3 are physical changes and 2 and 4 are chemical changes.

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

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

9. Boron (B) and Silicon (Si)

10.
a: brittle
b: malleable
c: brittle
d: malleable

11. They are not good conductors and they are brittle, so they would not bend well.

12. They are lustrous, malleable, and ductile.