Matter Review

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What is a Mixture of Elements?

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A mixture that contains two or more different elements that are not chemically combined. Example: A mixture of iron and sulfur.

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What is a Compound?

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A substance formed when two or more elements are chemically bonded together. Example: Sodium chloride (NaCl).

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What is a Homogeneous Mixture?

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A mixture that has a uniform composition throughout. Example: Saltwater.

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What is a Heterogeneous Mixture?

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A mixture that consists of visibly different substances or phases. Example: Italian salad dressing.

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What is an Element?

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A pure substance that cannot be broken down into simpler substances by chemical means. Example: Oxygen (O).

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What is the difference between a Compound and a Mixture?

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A compound is a substance formed from two or more elements chemically bonded, while a mixture is a combination of two or more substances that retain their individual properties.

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What is a Pure Substance?

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A material that has a constant composition and consistent properties throughout. Example: Distilled water.

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What is the Law of Conservation of Mass?

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In a chemical reaction, mass is neither created nor destroyed; it is conserved.

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What is a Chemical Change?

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A change that results in the formation of new chemical substances. Example: Rusting of iron.

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What is a Physical Change?

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A change that affects one or more physical properties of a substance without altering its chemical composition. Example: Melting ice.