5P22 Matter: Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

Front

If 15 grams of sugar is dissolved in 300 grams of water, what is the total mass of the mixture?

Back

315 grams.

Front

What happens to the mass of substances when they are mixed together?

Back

The total mass of the substances remains the same; it is the sum of the individual masses.

Front

If 25 grams of sugar dissolves in 150 grams of water, what is the new weight of the liquid?

Back

175 grams.

Front

What is an example of a physical change that demonstrates the Law of Conservation of Mass?

Back

Dissolving sugar in water is a physical change where the mass of the sugar and water combined equals the mass of the sugar-water solution.

Front

If a rock weighing 60 grams is broken into two pieces, what can be said about the total mass of the pieces?

Back

The total mass of the two pieces will still be 60 grams.

Front

What is the mass of iron if 250 grams of iron and sand are separated and the mass of the sand is 150 grams?

Back

100 grams.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that involves the rearrangement of the molecular or ionic structure of a substance.

Front

How does the Law of Conservation of Mass apply to chemical reactions?

Back

In a chemical reaction, the total mass of the reactants equals the total mass of the products, meaning mass is conserved.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change where the mass of the wood and oxygen used equals the mass of the ash and gases produced.