Which substance can not be broken down by a
chemical change?
(1) ethane (3) silicon
(2) propanone (4) water

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

For the following, determine the type of reaction and then give products.

Turbo the snail moves across the ground at a pace of 12 feet per day. if the garden is 48 feet away, how many days will it take for the snail to get there?