Conservation of mass

Front

Measure of the amount of matter

Back

mass

Front

Anything that has mass & takes up space

Back

matter

Front

Substances that form as the result of a chemical reaction

Back

products

Front

Substances present at the start of a chemical reaction

Back

reactants

Front

A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?

Back

500 grams, because the cheese does not gain or lose mass just because it was melted.

Front

Luke creates a model to observe the water cycle. He pours water into a clear container and closes the container and weighs it. Two days later, Luke observes about half of the water has evaporated and water droplets have formed on the sides of the container. Which is the weight of the container?

Back

The container weighs the same as it did 2 days ago.

Front

The mass after a physical change, such as ice melting into water, stays the same

Back

True

Front

The total amount of matter (atoms) before and after a chemical reaction (change), remains the same. (Assume it is a closed system.)

Back

True

Front

What is the Law of Conservation of mass?

Back

Mass is never created or destroyed

Front

What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the products after the reaction is complete?

Back

They both will weigh the same