Conservation of Mass Review

Front

The Law of Conservation of Mass states that mass can neither be __________ or __________.

Back

created; destroyed

Front

Which of the following represents a balanced chemical equation?

Back

2Na + 2H₂O → 2NaOH + H₂

Front

What are substances that react in a chemical reaction called?

Back

reactants

Front

What is the mass of the gas released if a solid weighing 25 g is mixed with 60 g of a solution and the final mass is 75 g?

Back

10g

Front

What are substances that form as the result of a chemical reaction called?

Back

products

Front

Define 'reactants' in a chemical reaction.

Back

Reactants are the starting materials that undergo a chemical change.

Front

Define 'products' in a chemical reaction.

Back

Products are the substances formed as a result of a chemical reaction.

Front

What does a balanced chemical equation represent?

Back

A balanced chemical equation represents the conservation of mass, showing that the number of atoms of each element is the same on both sides.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in the reaction.

Front

What role do subscripts play in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.