Law of Conservation of Mass

Front

What does the Law of Conservation of Mass state?

Back

Mass is never created or destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

Front

In a chemical equation, what does a coefficient represent?

Back

A coefficient indicates the number of molecules or moles of a substance involved in the reaction.

Front

In a chemical formula, what does a subscript indicate?

Back

A subscript indicates the number of atoms of an element in a molecule.

Front

If reactant A has 5g and product C has 9g, how much does reactant B weigh in the reaction A + B -> C?

Back

Reactant B weighs 4g.

Tags

NGSS.MS-PS1-5

Front

What is the total mass of water when 200g of ice melts in 900g of water?

Back

The total mass of water is 1,100g.

Tags

NGSS.MS-PS1-5

Front

How do you calculate the total mass of products in a chemical reaction?

Back

The total mass of products equals the total mass of reactants, according to the Law of Conservation of Mass.

Tags

NGSS.MS-PS1-5

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation.

Tags

NGSS.MS-PS1-5

Front

What happens to mass during a chemical reaction?

Back

The total mass remains constant; it is conserved.

Tags

NGSS.MS-PS1-5

Front

What is an example of a closed system in a chemical reaction?

Back

A closed container where no mass can enter or leave during the reaction.

Tags

NGSS.MS-PS1-5

Front

What is the difference between a reactant and a product?

Back

Reactants are substances that undergo a chemical change, while products are the substances formed as a result of the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5