Elements, Compounds, and Mixtures

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What is an element?
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An element is a pure substance made up of only one type of atom.
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Give an example of an element.
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Examples include oxygen (O), gold (Au), and hydrogen (H).
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What is a compound?
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A compound is a substance formed when two or more elements chemically combine.
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Give an example of a compound.
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Water (H2O) is a compound of hydrogen and oxygen.
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What is a mixture?
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A mixture is a combination of two or more substances where each retains its own properties.
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Give an example of a mixture.
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Salt water is a mixture of salt and water.
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How are compounds different from mixtures?
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Compounds have elements chemically combined, while mixtures have substances physically mixed.
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Can elements be broken down into simpler substances?
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No, elements cannot be broken down into simpler substances by chemical means.
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Can compounds be separated into their elements?
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Yes, compounds can be separated into their elements through chemical reactions.
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What process can separate a mixture of sand and water?
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Filtration can separate a mixture of sand and water.
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How can you separate a mixture of iron filings and sulfur?
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You can use a magnet to separate iron filings from sulfur.
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What is a homogeneous mixture?
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A homogeneous mixture has a uniform composition throughout, like air.
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What is a heterogeneous mixture?
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A heterogeneous mixture has a non-uniform composition, like a salad.
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How is a molecule related to compounds?
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A molecule is the smallest unit of a compound that retains its chemical properties.
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What state of matter are most metals at room temperature?
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Most metals are solid at room temperature.
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