Pure Substances and Mixtures

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What are pure substances?

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Pure substances are materials that are made up of only one type of particle. They have a uniform and definite composition.

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What are mixtures?

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Mixtures are combinations of two or more substances that retain their individual properties and can be separated by physical methods.

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What is a compound?

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A compound is a substance formed when two or more different elements are chemically bonded together.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout, meaning the different components are not distinguishable.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniformly distributed and can be easily distinguished.

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Can mixtures be separated by physical methods?

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Yes, mixtures can be separated into their individual components using physical methods such as filtration, distillation, or evaporation.

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Can pure substances be separated into simpler substances using physical methods?

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No, pure substances cannot be separated into simpler substances using physical methods; they can only be broken down by chemical methods.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is saltwater, where the salt is completely dissolved in the water.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a salad, where the individual ingredients can be seen and separated.

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What is the difference between an element and a compound?

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An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements that are chemically combined.