Dejon wants to test whether plants need soil to grow. He cuts two branches off of the plants and weighs them. He puts each in a glass of water and places one in an area with sunlight and the other in a shaded corner of the room. He makes sure that the glasses always have water. Over the next three months, the plants grow roots and get bigger. Do plants need soil to grow? Justify your answer using data from both Katia’s and Dejon’s experiments.

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.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.