Question

a) Explain elements. What is its form i.e. either H₂​​​​​, hydrogen or H.

b) Define and explain the following:

1) True solution

2) Colloidal solution

3) Suspension

Answer 1

1.
An element is a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction.
The number of protons in the nucleus of the atom of an element is known as the atomic number of that element.

H means element and H2 means molecule

2.

(1). True Solution: a mixture of two or more substances in which the solute is completely dissolve in the solvent. The size of particles in a true solution will be less than 1 nm in diameter.

(2). Colloidal Solution: a heterogenous mixture of two or more substances in which the substance is evenly suspended in the other. The size of particles in a colloidal solution will be larger than that of a true solution and smaller than suspension. The size range of particles in a colloidal solution will be 1 – 1000 nm in diameter.

(3). Suspension: The size of particles in a suspension will be greater than 1000 nm. Suspension is a heterogenous mixture of two or more substances.