Elements Compounds and Elements

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What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and gold.

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What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and carbon dioxide (CO2).

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What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Examples include salad, air, and saltwater.

Front

How can you identify a mixture?

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A mixture can be identified by the presence of two or more different substances that retain their individual properties and can be separated by physical means.

Front

What is the difference between an element and a compound?

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

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Can a mixture be separated?

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Yes, mixtures can be separated into their individual components by physical methods such as filtration, distillation, or evaporation.

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What is an example of a homogeneous mixture?

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A homogeneous mixture has a uniform composition throughout. An example is saltwater, where the salt is evenly dissolved in the water.

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What is an example of a heterogeneous mixture?

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A heterogeneous mixture has a non-uniform composition. An example is a salad, where the different ingredients can be seen and separated.

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What is the law of definite proportions?

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The law of definite proportions states that a chemical compound always contains the same proportion of elements by mass.

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What is the significance of the periodic table?

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The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.