Practice Chemical Equation in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

A written representation of a chemical reaction using chemical formulas, coefficients, and an arrow.

A recipe that shows what goes in, what comes out, and in what amounts.

Example 1

easy
What information does a balanced chemical equation convey? Explain using 2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O} as an example.

Example 2

medium
Interpret the following chemical equation including state symbols: \text{Na}_2\text{CO}_3\text{(s)} + 2\text{HCl(aq)} \rightarrow 2\text{NaCl(aq)} + \text{H}_2\text{O(l)} + \text{CO}_2\text{(g)}. What does each state symbol mean?

Example 3

medium
Write a balanced chemical equation with state symbols for the reaction of solid iron with oxygen gas to form solid iron(III) oxide.

Example 4

hard
A student writes the following unbalanced equation for the reaction of aluminum with sulfuric acid: \text{Al} + \text{H}_2\text{SO}_4 \rightarrow \text{Al}_2(\text{SO}_4)_3 + \text{H}_2. Balance this equation and verify by counting all atoms on each side.
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