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

What is the purpose of balancing chemical equations?

Back

The purpose is to ensure that the law of conservation of mass is followed, meaning that matter is neither created nor destroyed in a chemical reaction.

Front

What is a coefficient in a chemical equation?

Back

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

Front

What is a subscript in a chemical formula?

Back

A subscript is a small number written after an element symbol that indicates the number of atoms of that element in a molecule.

Front

How do you determine if a chemical equation is balanced?

Back

Count the number of atoms of each element on both sides of the equation. If they are equal, the equation is balanced.

Front

What does the arrow in a chemical equation represent?

Back

The arrow indicates the direction of the reaction, showing the reactants on the left and the products on the right.

Front

What is the difference between reactants and products?

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.

Front

How many oxygen atoms are in the compound 2H2O?

Back

There are 2 oxygen atoms in 2H2O because the subscript '2' indicates there are 2 water molecules, each containing 1 oxygen atom.

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

The balanced equation is CH4 + 2O2 -> CO2 + 2H2O.

Front

What is the significance of the law of conservation of mass in chemical reactions?

Back

It states that the total mass of reactants must equal the total mass of products in a chemical reaction.