Fill in the numbered blank spaces with the appropriate word or phrase. A substance that goes through phase change starts as a solid. As it is heated, the substance exists as a
_1_. When the substance is completely melted, its temperature will increase until it reaches the _2__
point. After the substance has finished boiling, it will exist as a 13

chemistry sucks a**

explanation:

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.