Classification of Matter and Changes

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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. It consists of only one type of atom.

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What is a compound?

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A compound is a substance formed when two or more different types of atoms bond together in a fixed ratio, resulting in a new substance with unique properties.

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What is a mixture?

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A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout, meaning the different components are not visibly distinguishable.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the different components can be seen and are not uniformly distributed.

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How can you identify a compound?

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You can identify a compound by the presence of different types of atoms bonded together in a fixed ratio.

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What is the difference between an element and a compound?

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An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is saltwater, where the salt is completely dissolved in water.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a salad, where the individual ingredients can be seen and separated.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.