The two main types of pure substances are compounds and elements. They consist of a single type of particle or compound.

All “things” are classified as matter. Everything on Earth can be easily described in terms of one of four forms of matter: solid, liquid, gas, and plasma. Students are familiar with the three common forms of matter: solids, liquids, and gases.

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds.

Chlorine

We can divide pure substances into two classes: elements and compounds. Pure substances that cannot be broken down into simpler substances by chemical changes are called elements.

All the elements and compounds are pure substances because they contain only one kind of particles. For Example: Hydrogen,Oxygen,Nitrogen,Chlorine,Iodine,carbon,Iron,Copper etc are pure substances(elements). Water, sodium chloride, Hydrochloric acid,Camphor etc. are pure substances (compounds).

Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements. All elements are pure substances.

Suspension is the heterogeneous mixture of two or more substances. In suspension, particles are suspended throughout in bulk and can be seen by naked eyes. Example of suspension – mixture of chalk and water, muddy water, mixture of flour and water, mixture of dust particles and air, fog, milk of magnesia, etc.

Answer: A substance is a matter that has definite properties and composition. Every pure compound and element is a substance.

Class 9 Chemistry Is Matter Around Us Pure. Colloids. Colloids. A colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions. For Example: – Soap solution, Milk, Ink, Blood and solutions of synthetic detergents.

The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions.

The process of settling of colloidal particles is called coagulation or precipitation of the sol. Blood is a colloidal solution of an albuminoid substance. The styptic action of alum and ferric chloride solution is due to coagulation of blood forming a clot which stops further bleeding.

A mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance. The mixture is also called a colloidal solution, colloidal system, or colloidal dispersion. The three forms in which all matter exists are solid, liquid or gas.

Examples of Colloids

• Colloids refer to dispersions of small particles usually with linear dimensions from around 1 nm to 10 micrometres.
• Examples: fog, smog, and sprays.
• Examples: smoke and dust in the air.
• Examples: milk and mayonnaise.
• Examples: pigmented plastics.
• Examples: silver iodide sol, toothpaste, and Au sol.
• Liquid aerosol.

The types of colloids include sol, emulsion, foam, and aerosol. Sol is a colloidal suspension with solid particles in a liquid. An emulsion is between two liquids. Foam is formed when many gas particles are trapped in a liquid or solid.

Colloids (also known as colloidal solutions or colloidal systems) are mixtures in which microscopically dispersed insoluble particles of one substance are suspended in another substance. Colloids usually feature substances that are evenly dispersed in another.

According to colloidal solution definition, it is defined as a solution in which a material is evenly suspended in a liquid. Some of the Examples of Colloidal Solution are gelatin; muddy water, Butter, blood, Colored Glass.

Milk is a colloidal solution because its particles are mixed in such a way that they do not settle at bottom of the container and do not remain unmixed.

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• Sucrose dissolved in water.
• Salt solution.
• Lemon juice.
• Urea in water.
• Acetic acid in water.
• Copper sulphate in water.
• All ionic compounds in water.
• Ethanol in water.

Is apple juice a true solution? Even if the apple juice is labelled as ‘100% pure’, it is still a mixture of water particles, sugar particles, flavour particles, and vitamin particles. So it is a mixture, not a pure substance.

Butter basically is a colloidal solution and hence comes under a type of solution. Butter is basically a solution of water and fat. It is said to be colloidal because the dispersed phase of butter is always a solid by the dispersion medium of butter would be a liquid.

True solutions are the type of mixtures, where the solute and solvents are properly mixed in the liquid phase, while Colloidal solutions are the type of mixture in the liquid phase, where the solute (tiny particles or colloids) is uniformly distributed in the solvent (liquid phase).

A solution is called a true solution because a true solution contains all the particles in right composition and correctly dissolved. so a solution is known to be as true solution.

Types of Solution

Salt water is a true solution because it dissolves completely in water and it makes a homogeneous mixture .