In his experiment that led to the discovery of oxygen, Priestley heated some red mercuric oxide and caused it to break apart. The chemical reaction is: HgO (s) → Hg (s) + O2 (g)

Is this chemical reaction balanced? Why or why not?

1 No, because the number of oxygen atoms is different on both sides.

2 No, because the number of both mercury and oxygen atoms is different on both sides.

3 Yes, because the number of both mercury and oxygen atoms is the same on both sides.

4 Yes, because the number of mercury atoms is the same on both sides.

the answer is 2

Explanation:

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they are made of gases.

they have a spherical shape.

they make energy through fusion.

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.