Balancing Equations

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

• charge

• subscript

• random number

• coefficient

When balancing equations, what is the purpose of using a coefficient?

• To change the chemical identity of a substance

• To indicate the number of molecules or moles

• To alter the subscripts in a chemical formula

• To balance the charges in an ionic compound

Tags

NGSS.HS-PS1-7

Which of the following is a balanced chemical equation?

Tags

NGSS.MS-PS1-5

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

What is the first step in balancing a chemical equation?

• Change the subscripts to balance atoms

• Add coefficients to balance atoms

• Count the number of atoms of each element

• Remove excess reactants

Which of the following represents the law of conservation of mass in a balanced equation?

• The total mass of reactants equals the total mass of products

• The total volume of reactants equals the total volume of products

• The total number of molecules is the same on both sides

• The total number of atoms is different on both sides

Tags

NGSS.MS-PS1-5

In a balanced chemical equation, the number of atoms of each element on the reactant side is ____ the number on the product side.

• greater than

• less than

• equal to

• unrelated to

Tags

NGSS.MS-PS1-5

Tags

NGSS.MS-PS1-5

• Fe

• O

• Fe2

• O3

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5