E-20 Balancing Chemical Equations

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, indicating that mass is conserved during the reaction.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients (the numbers in front of the compounds) to ensure that the number of atoms for each element is equal on both sides.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

What does the coefficient in a chemical equation represent?

Back

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

Front

How many hydrogen atoms are in 4 H₂O molecules?

Back

There are 8 hydrogen atoms in 4 H₂O molecules (4 x 2 = 8).

Front

How many aluminum atoms are in Al₂O₃?

Back

There are 2 aluminum atoms in Al₂O₃.

Front

What is the balanced equation for the reaction of iron and oxygen to form iron(III) oxide?

Back

4Fe + 3O₂ → 2Fe₂O₃.

Front

Balance the equation: CF₄ + Br₂ → CBr₄ + F₂.

Back

The balanced equation is 1CF₄ + 2Br₂ → 1CBr₄ + 2F₂.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.