ACS Chemistry Practice Exam 2025 – The All-in-One Guide to Exam Success!

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What does mass measure in an object?

The volume of the object

The amount of matter in the object

Mass measures the amount of matter in an object. It reflects the quantity of particles, such as atoms and molecules, that make up the object, and is a fundamental property that does not change regardless of the object's location (unlike weight, which is dependent on the gravitational field strength). Mass is typically measured in kilograms or grams and is distinct from volume, which refers to the space that an object occupies, and density, which is the ratio of mass to volume. Understanding that mass is a measure of matter helps clarify how scientists quantify substances and perform calculations in chemistry, such as stoichiometry and substance preparation.

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The weight of the object

The density of the object

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