Question

Classify the following into compounds and mixtures. Also identify pure substance from the give list

and write them separately.

Water, Soil, Sugar, Salt, Sugar solution, Air, Milk, Carbon dioxide, Hydrochloric acid, Brick​

Answer 1

The following substances are classified into compounds and mixtures as follows:

Compounds- Water, Sugar, Salt, Carbon dioxide, Hydrochloric acid

Mixtures- Soil, Sugar solution, Air, Milk, Brick

Pure substances- Water, Sugar, Salt, Carbon dioxide, Hydrochloric acid

• Compounds are substances formed by the chemical reaction between two or more elements. It combines only in a specific proportion as it has definite composition.

• Mixtures are substances formed by the combination of various substances but not in any specific proportion as they have a variable composition.

• All the compounds are pure substances unlike mixtures.

Answer 2

Answer:

Compounds : - Water, Sugar, Salt, Carbon Dioxide, Hydrochloric Acid,

Mixtures : - Soil, Sugar solution, Air, Milk, Brick

All compounds are pure substances.

Explanation:

Compounds

• Compounds are substances that are made up of two or more different types of elements.
• E.g. - $NaCl$ (Common Salt), $H_{2}O$ (Water)
• They have a fixed composition.
• They are chemically combined.
• They are pure substances.
• They can't be separated by physical methods.

Mixtures

• Mixtures are substances that are formed when two or more different substances are physically mixed together.
• E.g. - Sugar Solution, Air
• They do not have any fixed composition. They can be mixed in any proportion.
• The substances mixed do not undergo any chemical change and retain their individual properties.
• They are impure substances.
• They can be separated by physical methods.