Elements, Compounds, Mixtures

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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 oxygen, hydrogen, and gold.

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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. An example is water (H2O), which is made 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 that are not chemically bonded. Each substance retains its own properties. An example is a salad.

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What is the difference between a pure substance and a mixture?

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A pure substance is made of only one type of particle (element or compound), while a mixture contains two or more different particles.

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What is an example of a mixture?

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An example of a mixture is air, which contains various gases like nitrogen, oxygen, and carbon dioxide.

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What does it mean for a substance to be pure?

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A pure substance has a uniform and definite composition. It can be an element or a compound.

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What is the chemical formula for table salt?

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The chemical formula for table salt is NaCl, which is a compound made of sodium and chlorine.

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What happens when you mix sand and salt?

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When you mix sand and salt, you create a mixture where both substances retain their individual properties.

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What is the significance of chemical symbols?

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Chemical symbols are shorthand representations of elements, used to simplify chemical equations and formulas.

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What is an example of an element found in the human body?

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An example of an element found in the human body is carbon, which is essential for life.