Balancing Chemical Equations PhET

Where are the reactants in a chemical equation?

• The reactants are on the left side of the chemical equation.
• The reactants are on the right side of the chemical equation.

Where are the products in a chemical equation?

• The products are on the left side of the chemical equation.
• The products are on the right side of the chemical equation.

Tags

NGSS.MS-PS1-5

Why do we have to balance chemical equations?

• Because all mass must be conserved

• Because mass is created in a reaction

• Because the mass at the beginning of a reaction is greater than the mass of the products

• Because the mass at the end of the reaction is grater than the mass of the reactants

Tags

NGSS.MS-PS1-5

A number written slightly below and to the right of a chemical symbol that shows how many atoms of that element are in a compound is the ________

A number written in front of a chemical formula to indicate how many of that formula are needed for a balanced reaction

Tags

NGSS.MS-PS1-5

Balance "Make Ammonia". What's the total number of molecules on the reactant (left) side?

• 2

• 4

• 5

• 6

Tags

NGSS.MS-PS1-5

Balance "Make Ammonia". What's the total number of molecules on the product (right) side?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Balance "Separate Water". What's the total number of molecules on the product (right) side?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Balance "Separate Water". What's the total number of molecules on the reactants (left) side?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Balance "Combust Methane". What's the total number of molecules on the reactants (left) side?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5