Unit 3: Properties of Matter Flashcard

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What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

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What is an element?

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An element is a substance that is made of only one type of atom and cannot be broken down into simpler substances.

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What is a compound?

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A compound is a substance formed when two or more different types of atoms chemically bond together.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically combined and can be separated by physical means.

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What are physical properties?

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Physical properties are characteristics of a substance that can be observed or measured without changing its identity, such as color, density, and boiling point.

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as melting or dissolving.

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What is a chemical change?

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A chemical change occurs when a substance transforms into a different substance with different properties, such as rusting or burning.

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What is the periodic table?

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The periodic table is a tabular arrangement of elements, organized by increasing atomic number, that shows the relationships between them.

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What is the difference between a physical property and a chemical property?

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A physical property can be observed without changing the substance, while a chemical property describes how a substance reacts to form new substances.

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What happens when salt dissolves in water?

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When salt dissolves in water, it undergoes a physical change, as the salt particles separate but do not change their chemical identity.