Pure Substances/Mixtures/Particle Diagrams

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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. It can be an element or a compound.

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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. The proportions of the components can vary.

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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. It consists of only one type of atom.

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What is a compound?

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A compound is a pure substance formed when two or more elements chemically combine in a fixed ratio, resulting in new properties.

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What is a particle diagram?

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A particle diagram is a visual representation that shows the arrangement and types of particles in a substance, helping to illustrate whether it is an element, compound, or mixture.

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What does a particle diagram of a mixture of elements look like?

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A particle diagram of a mixture of elements shows different types of particles (atoms) that are not chemically bonded together.

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What does a particle diagram of a compound look like?

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A particle diagram of a compound shows particles that are chemically bonded together, representing a fixed ratio of different types of atoms.

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What is the difference between a homogeneous mixture and a heterogeneous mixture?

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A homogeneous mixture has a uniform composition throughout (e.g., saltwater), while a heterogeneous mixture has visibly different substances or phases (e.g., salad).

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What is an example of a mixture of compounds?

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An example of a mixture of compounds is air, which contains various gases like oxygen (O2) and nitrogen (N2) that are not chemically bonded.

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How can you identify a mixture from a particle diagram?

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A mixture can be identified in a particle diagram by the presence of different types of particles that are not bonded together.