Elements, Compounds, Mixtures

Front

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 (H), oxygen (O), and gold (Au).

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What is a compound?

Back

A compound is a pure substance formed when two or more elements are chemically bonded 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. Each substance retains its own properties. Examples include air and salad.

Front

What is the chemical symbol for Hydrogen?

Back

H

Front

What is the difference between a pure substance and a mixture?

Back

A pure substance has a uniform and definite composition, while a mixture contains two or more substances that retain their individual properties.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout. Examples include saltwater and air.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that does not have a uniform composition and the individual substances can be seen. Examples include a salad and a rock collection.

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What is a solution?

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A solution is a type of homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). An example is sugar dissolved in water.

Front

What is the classification of brass?

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Brass is classified as a mixture because it is made by combining two elements, zinc and copper, without a chemical reaction.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.