91影视

What is the mass of an oxygen atom in atomic mass units? 17.3 Reaction Rates

Why don鈥檛 all collisions between reactant molecules lead to product formation?

What generally happens to the rate of a chemical reaction with increasing temperature?

What term is used to describe the minimum amount of energy required in order for a reaction to proceed?

What does a catalyst do to the energy of activation for a reaction?

What net effect does a chemical reaction have on a catalyst?

If it takes 436 kJ to break a bond, how many kilojoules are released when the same bond is formed?

What is released by an exothermic reaction?

If you ever have the opportunity to play with an electric train set, be sure to smell the engine car after it has been operating. You will note a slight 鈥渆lectric smell.鈥� This is the smell of ozone gas, which is created as the oxygen in the air is zapped with electrical sparks. Why is this smell sometimes apparent during a lightning storm or when you pull your fuzzy sweater off in the dry winter? Is the formation of ozone from oxygen an endothermic or exothermic reaction?

Baker鈥檚 yeast contains a biological catalyst known as catalase, which catalyzes the transformation of hydrogen peroxide, H2O2, into oxygen, O2, and water, H2O. Write a balanced equation for this reaction. Add a couple milliliters of 3% hydrogen peroxide to a glass containing a small amount of baker鈥檚 yeast. What happens? Why?