FIREWORKS
1. Watch the film and choose the right answer:
a. Potassium nitrate is used:
1) to produce red colour
2) as a fuel
3) to make black powder
b. .......................... is used in a lot of colour compositions.
1) Sulfur
2) Potassium perchlorate
3) Magnesium powder
c. To produce heat we need:
1) only a fuel
2) a fuel and an oxidizer
3) an aerial shell and sulfur
d. The aerial shell doesn't include:
1) a black powder propellant
2) a time fuse
3) strontium nitrate
2. Complete the sentence:
We produce colours using the effect that different chemicals heated at .......................... get rid of this energy meeting very specific ........................... .
3. Match the substances with the colour that they produce:
|
a. copper oxide |
1. yellow |
|
| b. strontium chloride |
2. blue |
|
| c. sodium silicate |
3. green |
|
| d. calcium nitrate |
|
4. red |
| e. barium acetate | 5. yellow |
4. True or false?
a. To produce colour you start with a burning mixture.
b. A burning mixture contains a fuel and a colour component.
c. Blue is the hardest colour to produce.
d. A red flame composition from strontium nitrate has a very bright flame because it produces heat.
e. A white sparks effect is produced by a base mixture and potassium nitrate.