| MARK SCHEME |
|
|
|
|
| |
|
|
|
|
| a) |
P |
Green crystals turn white/changes color |
|
1
|
| |
|
Crystals go to powder |
|
1
|
| |
|
Vapor (water) |
|
1
|
| |
Q |
Blue crystals turn white/changes color |
|
1
|
| |
|
Crystals go to powder |
|
1
|
| |
|
Vapor (water) |
|
1
|
| |
R |
Green crystals turn white yellow/cream/changes
color |
|
1
|
| |
|
Crystals go to powder |
|
1
|
| |
|
Vapor (water) |
|
1
|
| |
|
|
Subtotal |
9
|
| |
|
|
|
|
| b) |
|
Loss of color (or changed color) |
|
1
|
| |
|
Loss of crystalline form |
|
1
|
| |
|
Water vapor given off |
|
1
|
| |
|
|
Subtotal |
3
|
| |
|
|
Total |
12
|
|
|
