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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into different substances with new chemical properties. Example: Wood burning.

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What is a physical change?

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

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What is conductivity?

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Conductivity is the property of matter that allows it to transfer heat or electricity.

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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. Example: NH3 (ammonia) is a compound.

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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. Example: Saltwater.

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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. Example: Oxygen (O).

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing its identity. Example: Color, density.

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What is a chemical property?

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A chemical property is a characteristic of a substance that describes its ability to undergo a specific chemical change. Example: Flammability.

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What is the difference between physical and chemical changes?

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Physical changes do not alter the chemical composition of a substance, while chemical changes result in the formation of new substances.

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What is density?

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Density is the mass per unit volume of a substance, often expressed in grams per cubic centimeter (g/cm³).