Students in a chemistry class added 127 grams of copper to 32 grams of oxygen. A chemical reaction occurred that produced copper oxide, as shown in the equation below, with no copper or oxygen left over. 2 Cu + ___ O2 → 2 CuO

What type of reaction did the students demonstrate?

Enzymes are proteins that speed up reactions by providing an additional energy source supplying additional molecules for the reaction removing inhibitors that slow down reactions lowering the amount of energy required

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased

The source of energy shown in the image is (renewable, non renewable, polluting) a drawback of building a dam is that (it will destroy ecosystems, it requires fossil fuels, it won’t be useful for irrigation)