Name the following chemical compound.
k2co3
a. krypton carbonate
b. potassium carbonate
c. krypton carbohydrate
d. potassium carbohydrate

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

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Which is an example of a reversible physical change?