Question

Which material is a pure substance?

Answer 1

The answer is B. The material that can be considered as a pure substance is the compound. A pure substance is defined as a material that is only composed of one substance. The other choices given are mixtures where there are two or more different substances in a material.

Answer 2

B) compound is a pure substance

Further explanation

A pure substance can be an element or compound.

The element is a single substance that cannot be broken down anymore or the simplest substance.

While the compound is a pure substance that is formed from a combination of two or more elements through chemical reactions and has a constant chemical ratio.

A mixture is a combination of two or more single substances. The properties of the mixture component are not lost / unchanged as in compounds.

The mixture can be divided into a homogeneous mixture if the composition / ratio of each substance in the mixture is the same and heterogeneous mixture if the ratio of the composition of the substances is not the same (can be varied) in each place.

Mixtures can also be divided into solutions, suspensions and colloids based mainly on the size of the particles

• A) alloy

alloy is a mixture of elements that have metal properties

• B) compound

Compounds are represented in chemical formulas which can be separated into their constituent elements by chemical processes

• C) mixture

can be separated by physical or mechanical means, the composition can be changed depending on the proportion of pure substances that form it

• D) solution

Solution is: a mixture of two or more substances consisting of a solute and a solvent. The particle size of the solution is very small, less than 1 nm.

Learn more

A heterogeneous mixture

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a homogeneous mixture

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an example of a physical change

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