Chemistry - Unit 1: MATTER

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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. Examples include changes in state, such as melting or freezing.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the breaking and forming of bonds.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition and appearance throughout. The individual components are not distinguishable.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the components are not uniformly distributed and can be easily distinguished from one another.

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How can a salt water solution be separated?

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A salt water solution can be separated by evaporation, which involves heating the solution to remove the water, leaving the salt behind.

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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 with different properties.

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What is an example of a physical change?

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An example of a physical change is the freezing of water into ice.

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What is an example of a chemical change?

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An example of a chemical change is the reaction between vinegar and baking soda that produces carbon dioxide gas.

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What does it mean for a solution to look the same throughout?

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It means that the solution is homogeneous, with a consistent appearance and composition.

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What is evaporation?

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Evaporation is the process by which liquid turns into vapor, often used to separate components of a solution.