Elements, Compounds, Mixtures

Front

What is an element?

Back

A substance that cannot be broken down into any other substance by ordinary chemical means.

Front

What is a compound?

Back

A pure substance formed when two or more elements are chemically combined in a fixed ratio.

Front

Define a mixture.

Back

A combination of two or more substances that are not chemically combined and can be separated by physical means.

Front

What distinguishes a pure substance from 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 mixture that has a uniform composition throughout, such as saltwater.

Front

What is a heterogeneous mixture?

Back

A mixture that does not have a uniform composition and the individual substances can be seen, such as a salad.

Front

Can compounds be separated into their elements? If so, how?

Back

Yes, compounds can be separated into their elements through chemical reactions.

Front

What is the law of definite proportions?

Back

A principle stating that a chemical compound always contains its component elements in fixed ratio by mass.

Front

What is the difference between a solution and a suspension?

Back

A solution is a homogeneous mixture where the solute is completely dissolved, while a suspension is a heterogeneous mixture where particles are dispersed but not dissolved.

Front

What is an example of a compound?

Back

Water (H2O), which is made up of hydrogen and oxygen in a fixed ratio.