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Ans1: Colloids are mixtures whose particles are larger than the size of a molecule but smaller than particles that can be seen with the naked eye. Colloids are one of three major types of mixtures, the other two being solutions and suspensions. The three kinds of mixtures are distinguished by the size of the particles that make them up. The particles in a solution are about the size of molecules, approximately 1 nanometer (1 billionth of a meter) in diameter. Those that make up suspensions are larger than 1,000 nanometers. Finally, colloidal particles range in size between 1 and 1,000 nanometers. Colloids are also called colloidal dispersions because the particles of which they are made are dispersed, or spread out, through the mixture.
Types of colloids
Colloids are common in everyday life. Some examples include whipped cream, mayonnaise, milk, butter, gelatin, jelly, muddy water, plaster, colored glass, and paper,etc
Ans2: In chemistry when two or more substances mix with each other it results in the formation of a Mixture. The result formed due to the combination of substances does not lose its individuality nor are they combined chemically. Mixtures are the one product of a mechanical blending or mixing of chemical substances such as elements and compounds.
General properties of mixtures
Mixtures are made up of two or more substances which are not chemically combined with each other.
The components of a mixture each keep their original properties.
The components can be separated easily.
The proportion of the components is variable.
Ans3: The law of conservation of mass states that in a closed system, the mass of the system cannot change over time. Look at our example of the candle in the closed room. Though much of the wax itself is no longer present in its original form, all of the mass of the wax is still present in the room, albeit in a different form.
When the flame was lit, oxygen gas from the room reacted with the candle wax to produce water vapor and carbon dioxide gas. If you massed the reactants oxygen and wax, it would equal the mass of the products water and carbon dioxide. We can remember the law of conservation of mass with this simple statement:
The mass of the reactants must equal the mass of the products.
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