Elements, Molecules, Compounds, & Mixtures Practice

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What is an Element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H), oxygen (O), and gold (Au).

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What is a Compound?

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A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

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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 bonded. Examples include air, salad, and sand and salt.

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How can you identify a Compound?

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A compound can be identified by its chemical formula, which shows the elements and their ratios. For example, H2O indicates two hydrogen atoms and one oxygen atom.

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How can you identify a Mixture?

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A mixture can be identified by the ability to separate its components physically, such as filtering or using a magnet.

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What is the difference between an Element and a Compound?

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An element is a single type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

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What is the difference between a Compound and a Mixture?

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A compound has a fixed composition and properties, while a mixture has variable composition and retains the properties of its components.

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Can a Compound be separated into its elements?

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Yes, a compound can be separated into its elements through chemical reactions, such as electrolysis.

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Can a Mixture be separated into its components?

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Yes, a mixture can be separated into its components using physical methods like filtration, distillation, or evaporation.

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What is an example of a Compound?

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An example of a compound is sodium chloride (NaCl), which is table salt made from sodium and chlorine.