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.

Tags

NGSS.MS-PS1-5

Front

What does the subscript in a chemical formula represent?

Back

The subscript represents the number of atoms of an element in a molecule.

Tags

NGSS.MS-PS1-1

Front

What is the purpose of coefficients in a chemical equation?

Back

Coefficients are used to balance chemical equations by indicating the number of molecules or moles of a substance involved in the reaction.

Tags

NGSS.MS-PS1-5

Front

What does the arrow in a chemical equation signify?

Back

The arrow represents the direction of the chemical reaction, indicating the reactants on the left and the products on the right.

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.

Tags

NGSS.MS-PS1-5

Front

What is the first step in balancing a chemical equation?

Back

Identify the number of atoms of each element in the reactants and products.

Front

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

Back

The law states that mass is neither created nor destroyed in a chemical reaction, which is why equations must be balanced.

Tags

NGSS.MS-PS1-5

Front

What is an unbalanced chemical equation?

Back

An unbalanced chemical equation has different numbers of atoms for one or more elements on either side of the equation.

Tags

NGSS.MS-PS1-5

Front

In the equation CH4 + 4 Cl2 → CCl4 + _____ HCl, what coefficient balances the equation?

Back

4

Tags

NGSS.MS-PS1-5

Front

What is the role of reactants in a chemical equation?

Back

Reactants are the starting substances that undergo a chemical change to form products.