Type in the correct polite expressions to replace the following impolite expressions. Clues: Black brown, insoluble, white, soluble, black.
| Element |
Flame colour |
Colour of the product formed |
Solubility of product in water |
| Sodium |
Yellow |
| |
| Magnesium |
Bright white |
| |
| Calcium |
Bright red |
| |
| Copper |
Blue |
| |
| Iron |
Yellow sparks |
| |