Question

paul and karen were studying physical and chemical properties of matter. they determined that the mass of a sample was 50 grams. which sentence best states how mass describes matter?
the mass of a substance is a way to measure the amount of matter it contains.
mass is a way to measure the force of gravity on a substance.
the mass of a substance may change, based on its location.
mass is a chemical property of a substance.

Explanation:

Mass is an intrinsic property of matter. It quantifies the amount of material in an object. Weight (related to the second option) is the force of gravity on a substance and can change with location (so the third option is wrong). Mass is a physical property (not chemical, so the fourth option is wrong). The first option correctly defines mass as a measure of the amount of matter.

Answer:

The mass of a substance is a way to measure the amount of matter it contains.