Why are prefixes used in naming covalent compounds? A. The prefixes identity the only way the atoms can combine.

B. The same atoms can combine in more than one ratio.

C. The atoms can have different numbers of valence electrons

D. Oxidation states of the atoms are identified with prefixes


it's d


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Similar to a molecular equation, which expresses compounds as molecules, an ionic equation is a chemical equation in which the electrolytes in aqueous solution are expressed as dissociated ions. Usually, this is a salt dissolved in water, where the ionic species are followed by (aq) in the equation to indicate they are in aqueous solution.


a H2SO4


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All ionic substances are written as separate ions in solution



A redox reaction is a reaction when oxidation states (or numbers) change during reaction.

  a. Elemental iron (Fe) : 0

b. Elemental oxygen (O_2) : 0

c. One iron atom in Fe_2O_3: +3

d. One oxygen atom in Fe_2O_3 : -2


Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

In neutral ionic compound , the oxidation states are exchanged to give the molecular formula. Thus in Fe_2O_3 iron has oxidation state of +3 and oxygen has oxidation state of -2.

For the reaction :

4Fe+3O_2\rightarrow 2Fe_2O_3

On reactant side:

Oxidation state of iron in elemental state = 0

Oxidation state of oxygen = 0

On product side:

Oxidation state of iron = +3

Oxidation state of oxygen = -2

Twelve electrons


If we look at the product side, we will notice that iron lost twelve electrons and oxygen gained twelve electrons.

Hence, we have 4Fe^3+ and 2O3^2- showing twelve electrons lost/gained.


The structure of a molecule affects how it interacts with other molecules

Explanation: A P E X got it right

1. CuCl2
Cl: 2(-1)= 2-
Cu: 2+
~ON of Cl: 1-
~ON of Cu: 2-

H: 4(1)= 4+
C: 4-

~ON of H: 1+
~ON of C: 4-

the correct answer is A

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