PS Review for Final Flashcard Part 1

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What is a Physical Change?

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A Physical Change is an alteration in the physical state of matter without changing its chemical composition. Examples include tearing paper, melting ice, and dissolving sugar in water.

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What is a Chemical Change?

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A Chemical Change is a transformation that results in the creation of new substances. Examples include rusting iron, burning wood, and cooking an egg.

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What is a Mixture?

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A Mixture is a combination of 2 or more substances (elements and compounds) that are physically blended together. Examples include air, salad, and saltwater.

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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. Examples include water (H2O) and carbon dioxide (CO2).

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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 hydrogen (H), oxygen (O), and gold (Au).

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What is the difference between a Physical Property and a Chemical Property?

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A Physical Property can be observed without changing the substance's chemical identity (e.g., color, melting point), while a Chemical Property describes how a substance reacts with other substances (e.g., flammability, reactivity).

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What is an example of a Physical Change?

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Melting ice is an example of a Physical Change, as it changes from solid to liquid without altering its chemical composition.

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What is an example of a Chemical Change?

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Rusting iron is an example of a Chemical Change, as it results in the formation of a new substance (iron oxide).

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What does it mean for a substance to be flexible?

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A flexible substance can be bent into different shapes without breaking. This relates to its physical properties.

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What is the definition of a Substance in chemistry?

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A Substance is a form of matter that has a uniform and definite composition. It can be an element or a compound.