Question 1

What is a pure substance in science? Give two examples of pure substances.

Accepted Answer

In scientific terms, a pure substance refers to a form of matter that consists of only a single type of particle, having a uniform and fixed chemical composition throughout. All constituent particles of a pure substance are identical in their chemical nature. They cannot be separated into other kind

Question 2

What is the Tyndall effect? Name two mixtures that exhibit this effect.

Accepted Answer

The Tyndall effect is defined as the phenomenon of scattering of a beam of light by small colloidal particles present in a medium, making the path of the light beam visible. This effect occurs because the particle size in colloids is large enough to scatter visible light rays. Examples of mixtures t

Question 3

Explain the principle behind the separation of two immiscible liquids using a separating funnel.

Accepted Answer

The separation of two immiscible liquids using a separating funnel is based on the principle that immiscible liquids separate out into distinct layers depending on their different densities. The liquid with the higher density forms the bottom layer, while the lighter liquid with lower density forms

Question 4

What is chromatography? Write one important application of chromatography.

Accepted Answer

Chromatography is an advanced separation technique used for the separation of those solutes that dissolve in the same solvent. The term is derived from the Greek word 'chroma', meaning color, as it was initially used to separate pigments. One important application of chromatography is in the field o

Question 5

State two differences between physical changes and chemical changes.

Accepted Answer

Two fundamental differences between physical and chemical changes are: 1. In a physical change, no new substance is formed, and the chemical composition of the matter remains unaltered (e.g., melting of ice). In a chemical change, one or more entirely new substances with different properties are for

Is Matter Around Us Pure