Why must chemical equations be balanced?

[henry3369]

Homework Statement

Why must chemical equations be balanced (check all that apply).

(a) In a balanced chemical equation, the coefficients in front of each reactant and product allow us to predict how much reactants are required to form a given amount of products.

(b) In a balanced chemical equation, the coefficients in front of each reactant and product allow us to predict whether the given reaction is possible or not.

(c) In a balanced chemical equation, the coefficients in front of each reactant and product allow us to predict whether the reaction requires a catalyst or not.

(d) In a balanced chemical equation, the coefficients in front of each reactant and product allow us to predict the amount of product that can form from a given amount of reactant.

(e) In a balanced chemical equation, the coefficients in front of each reactant and product allow us to predict how much of one reactant is required to react with a given amount of another.

Homework Equations

The Attempt at a Solution

I chose everything except for c, but it is wrong. All the other ones seem correct to me and I don't see how a balanced equation can tell you anything about a catalyst, so I'm assuming one of the ones I chose is incorrect, but I'm not sure which one(s).

 

[Bystander]

so I'm assuming one of the ones I chose is incorrect,

And, there is an incorrect answer in there, so, let's take 'em one at a time.
"A?" And your reasoning.