Classification of Matter

Front

What is the definition of 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.

Front

What distinguishes a compound from a mixture?

Back

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio, while a mixture is a combination of two or more substances that retain their individual properties.

Front

What is an example of a pure substance?

Back

Gold (Au) is an example of a pure substance as it consists of only one type of atom.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the components are not uniformly distributed, and different parts of the mixture can be seen and separated.

Front

What is an example of a compound?

Back

Table salt (NaCl) is an example of a compound, as it is formed from sodium and chlorine in a fixed ratio.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means, while a compound is made up of two or more elements that are chemically combined.

Front

What is the classification of brass?

Back

Brass is classified as a homogeneous mixture because it is a mixture of copper and zinc that has a uniform composition.

Front

What is the definition of a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout, and the individual components are not distinguishable.

Front

What is the significance of the law of definite proportions in chemistry?

Back

The law of definite proportions states that a chemical compound always contains its component elements in fixed ratio by mass, which is fundamental in understanding compounds.

Front

How can you identify a heterogeneous mixture?

Back

A heterogeneous mixture can be identified by the presence of visibly different substances or phases within the mixture.