1. what is an enzyme?
2. how does hydrogen peroxide get into cells?
3. how does a cell deal with the buildup of hydrogen peroxide?
4. what would happen if a cell couldn’t make catalase?
5. why hydrogen is broken down, what two substances are created?

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.