Chemistry: Physical/Chemical Properties & Changes

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What is a Chemical Change?

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A process where substances combine or break apart to form new substances, often accompanied by energy changes (e.g., heat, light). Example: Burning wood.

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What is a Physical Change?

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A change that affects one or more physical properties of a substance without altering its chemical composition. Example: Melting ice.

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What is Solubility?

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The ability of a substance to dissolve in a solvent, forming a solution. Example: Sugar dissolving in water.

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What are Physical Properties?

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Characteristics of a substance that can be observed or measured without changing its identity. Examples: Color, melting point, boiling point.

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What are Chemical Properties?

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Characteristics that describe a substance's ability to undergo changes that transform it into different substances. Examples: Flammability, reactivity with acids.

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What happens during a combustion reaction?

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A chemical change where a substance reacts with oxygen, producing heat and light, and forming new products like carbon dioxide and water.

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What is an example of a Physical Change in everyday life?

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Blowing dry your wet hair is a physical change as it involves a change in state (from wet to dry) without altering the hair's chemical structure.

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What is an example of a Chemical Change in cooking?

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Toasting bread is a chemical change as it involves the Maillard reaction, creating new flavors and colors.

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

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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What is an example of a Chemical Change in fireworks?

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The explosion of fireworks is a chemical change as it involves a rapid reaction that produces heat, light, and new chemical compounds.