Chemical Reactions II

Question 1

Precipitate

Answer 1

• Cause (a substance) to be deposited in solid form from a solution.
• cause (drops of moisture or particles of dust) to be deposited from the atmosphere or from a vapour or suspension.

Question 2

Element

Answer 2

Each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms

Question 3

Ion

Answer 3

An atom or molecule with a net electric charge due to the loss or gain of one or more electrons

Question 4

Atom

Answer 4

The smallest particle of a chemical element

Question 5

Proton

Answer 5

A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.

Question 6

Electron

Answer 6

A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Question 7

Neutron

Answer 7

A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Question 8

Solution

Answer 8

A liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent).

Question 9

Aqueous

Answer 9

The word aqueous means pertaining to, related to, similar to, or dissolved in water. As water is an excellent solvent and is also naturally abundant, it is a ubiquitous solvent in chemistry.

Question 10

Activity Series

Answer 10

An activity series is a list of metals in order of decreasing activity (from top to bottom). A metal’s activity describes its ability to give up electrons (or to be oxidized); the more active a metal is, the more likely it is to become a cation.