Hydrogen peroxide ( H2O2 ) is used on cuts and scrapes to kill bacteria that could enter the body and cause an infection. When hydrogen peroxide is poured on a cut, it comes into contact with an enzyme called catalase. In a chemical reaction, the hydrogen peroxide breaks down into water and oxygen gas. Select the correct number from each menu below to construct a balanced chemical equation that represents the chemical reaction.

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.