Element, 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. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together in a fixed ratio.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

Give an example of an element.

Back

An example of an element is oxygen (O), which is essential for respiration.

Front

Give an example of a compound.

Back

An example of a compound is water (H2O), which consists of two hydrogen atoms and one oxygen atom.

Front

Give an example of a mixture.

Back

An example of a mixture is salad, which contains various vegetables mixed together but not chemically combined.

Front

What distinguishes a compound from a mixture?

Back

A compound has a fixed composition and specific properties, while a mixture retains the individual properties of its components and can vary in composition.

Front

How can mixtures be separated?

Back

Mixtures can be separated by physical methods such as filtration, distillation, or chromatography.

Front

What is a homogeneous mixture?

Back

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

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that does not have a uniform composition, such as a salad or a mixture of sand and iron filings.