Monday, September 29, 2014

Substitute 9/29

Click on the link to the video above. If you can't see the video below.
Please ask the students to write the following questions on a piece of paper. They need to answer them as the video plays.

1.        When did the Chinese discover black powder?

2.       Potassium nitrate (KNO3) is also called ________________________.

3       How long does it take to wire a large fireworks?

4.       Until the 1830s, fireworks displays had very little color until  KNO3 was replaced with _________________________.

5.       What types of salts are added to fireworks to give them colors?

6.       Copper makes the fireworks _________ in color. Strontium makes them ________ in color, and barium makes them __________ in color.

7.   How many people in the US are injured each year by fireworks? What percent of those are injured by illegal fireworks?

  8. How hot do sparklers burn?

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