Describing and Classifying matter

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the composition is uniform throughout. Examples include saltwater and air.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the composition is not uniform throughout. Examples include salad and sand.

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What is the chemical formula for ammonia?

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The chemical formula for ammonia is NH₃.

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What is a physical property of matter?

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A physical property is a characteristic of a substance that can be observed or measured without changing its identity, such as color, melting point, and density.

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What is a chemical property of matter?

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A chemical property is a characteristic that can only be observed during a chemical reaction, such as reactivity with acid or flammability.

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What is an example of a chemical change?

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An example of a chemical change is rusting of iron, where iron reacts with oxygen to form iron oxide.

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What is an example of a physical change?

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An example of a physical change is melting ice into water, where the substance changes state but remains H₂O.

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What distinguishes a compound from a mixture?

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A compound is a substance formed when two or more elements chemically bond together, while a mixture is a combination of two or more substances that retain their individual properties.

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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 chemically combined.

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What is the significance of the chemical formula?

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A chemical formula provides information about the types and numbers of atoms in a compound, indicating its composition.