Balancing Chemical Equations- In Class Version

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, reflecting the law of conservation of mass.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

How many atoms of hydrogen (H) are in C6H12O6?

Back

12

Front

What type of reaction is represented by the equation 2H2O2 → 2H2O + O2?

Back

Decomposition reaction.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula that indicates how many molecules or moles of that substance are involved in the reaction.

Front

Identify the balanced equation: CH4 + 2O2 → CO2 + 2H2O

Back

This equation is balanced because there are equal numbers of each type of atom on both sides.

Front

What evidence indicates a chemical reaction has occurred?

Back

Evidence includes gas production (bubbles), color change, temperature change, or the formation of a precipitate.

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where one compound breaks down into two or more simpler substances.

Front

How do you determine the number of atoms in a molecule like C6H12O6?

Back

Count the subscripts: C has 6, H has 12, and O has 6 atoms.