January 07 Answers

 

1.                  B

2.                  A

3.                  A

4.                  D

5.                  C

6.                  D

7.                  A

8.                  C

9.                  B

10.              D

11.              B

12.              B

13.              C

14.              B

15.              C

16.              B

17.              A

18.              C

19.              A

20.              CHEMICAL CHANGE….justification (a colour change was observed and a gas was given off.)

21.              1.   Find the initial mass of the substance.

2.      Heat it with a bunsen burner.

3.      Look for a colour change.

4.      Mass the product after it cools.

 

 

22.              vinyl = negative

silk = positive

vinyl and silk attract

 

23.      

Element

Chemical Symbol

Name of Chemical Family

A

K

alkali metals

B

F

halogens

C

Mg

alkaline earths

D

Ar

noble gases

 

24 and 25 not responsible for