CHEMISTRY [3 Mark Question Answer]

(a) The law of conservation of mass states that. "The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another". According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products for a low energy thermodynamic process.
(b) Thus, we can say that the law of conservation of mass is preserved.
Therefore, we can see that Barium Chloride reacts with Sodium Sulphate to form Barium Sulphate and Sodium Chloride, which according to the law of conservation of mass, proves that the total mass of the reactants is equal to the total mass of products.

(a) The particles must be able to move around for diffusion to work. Diffusion does not occur in solids because the particles in a solid can only vibrate and cannot migrate from one location to another.
(b) Liquids flow because the particles in a liquid are not very tightly bound to each other and they have high intermolecular spaces between them, which allows the particles to be displaced or move causing the liquids to flow.
(c) Gases are highly compressible because they have large intermolecular spaces between the molecules. As a result, its intermolecular force of attraction is very weak Therefore, gases are easily compressible.

(a) A substance is a form of matter that has a uniform properties while a material is a matter from which a thing is or can be made.
For example, Pure solids, liquids and gases etc. are substances. And Wood, Book, Table, Stone, Fibers, etc. are materials.
(b) A homogeneous mixture has the same uniform appearance while heterogeneous mixture consists of visibly different substances.
For example, Air, Most Alloys, etc. are example of homogeneous And heterogeneous include Sand and oil in water, Toy box filled with toys, etc.