Balancing equations

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be gained or lost in a chemical reaction.

Tags

NGSS.MS-PS1-5

Front

Is the equation 2Na + 2H2O → 2NaOH + H2 balanced?

Back

Yes

Tags

NGSS.MS-PS1-5

Front

Fill in the blanks with coefficients: PCl5 + _ H2O → _ HCl + H3PO4

Back

4, 5

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Front

Which equation is balanced? PbO2 + 2H2, SO2 + H2O → H2SO4, or 2Na + 2H2O → 2NaOH + H2?

Back

2Na + 2H2O → 2NaOH + H2

Tags

NGSS.MS-PS1-5

Front

Balance this equation: _Al + _HCl → _H2 + _AlCl3

Back

2, 6, 3, 2

Tags

NGSS.MS-PS1-5

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 atoms are involved in the reaction.

Tags

NGSS.MS-PS1-5

Front

What is a balanced equation?

Back

A balanced equation has the same number of each type of atom on both sides of the equation.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Front

Why is balancing equations important?

Back

It ensures that the Law of Conservation of Mass is followed, meaning matter is neither created nor destroyed.

Tags

NGSS.MS-PS1-5

Front

What does it mean if an equation is unbalanced?

Back

It means that the number of atoms of at least one element is different on the reactant side compared to the product side.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the first step in balancing a chemical equation?

Back

Count the number of atoms of each element on both sides of the equation.

Tags

NGSS.MS-PS1-1