Elements, Compounds, and 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).

Front

What is a compound?

Back

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

Front

What is a mixture?

Back

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

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 the chemical formula for sugar?

Back

The chemical formula for sugar is C12H22O11.

Front

Which of the following is an example of a compound: HCl, Cl, NaCl, CO2?

Back

HCl, NaCl, and CO2 are compounds; Cl is an element.

Front

What does the term 'homogeneous mixture' mean?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

Front

What does the term 'heterogeneous mixture' mean?

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A heterogeneous mixture is a mixture where the components are not uniformly distributed, such as a salad.

Front

Can elements be broken down into simpler substances?

Back

No, elements cannot be broken down into simpler substances by chemical means.

Front

What is the significance of a chemical formula?

Back

A chemical formula represents the elements in a compound and the ratio of atoms, providing essential information about its composition.