S1 Practice: Balancing Chemical Equations

Front

What does the Law of Conservation of Matter state?

Back

In a chemical reaction, matter is neither created nor destroyed.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Front

When balancing chemical equations, what can you change?

Back

You can only change coefficients, not subscripts.

Front

What is the purpose of balancing chemical equations?

Back

To ensure that the mass and number of atoms are conserved in a chemical reaction.

Front

What does a coefficient in a chemical equation represent?

Back

A coefficient indicates the number of molecules or moles of a substance involved in the reaction.

Front

What is the balanced equation for the combustion of propane (C3H8)?

Back

@@1 ext{ C}_3 ext{H}_8 + 5 ext{ O}_2 ightarrow 4 ext{ H}_2 ext{O} + 3 ext{ CO}_2@@.

Front

Which of the following is a balanced reaction? 2 Cu + 1 O2 → ?

Back

@@2 ext{ Cu} + 1 ext{ O}_2 ightarrow 2 ext{ CuO}@@.

Front

What is the balanced equation for the reaction of silver iodide and sodium sulfide?

Back

@@2 ext{ AgI} + 1 ext{ Na}_2 ext{S} ightarrow 1 ext{ Ag}_2 ext{S} + 2 ext{ NaI}@@.

Front

What happens if you change the subscripts in a chemical formula?

Back

Changing subscripts alters the identity of the substance and is not allowed when balancing equations.

Front

What is the significance of balancing chemical equations in real-world applications?

Back

It is crucial for understanding reaction yields, stoichiometry, and environmental impacts.