2021 - JAMB Chemistry Past Questions and Answers - page 1

The common name: Isobutyl bromide

The IUPAC name: 1-Bromo-2-methylpropane

Formula: C\(_4\)H\(_9\)Br

Zymase is an enzyme complex that catalyzes the fermentation of sugar into ethanol and carbon dioxide. It occurs naturally in yeasts. More

Albert Einstein's theory of special relativity defines the relationship between mass and energy, E = mc^2

Propyne (methylacetylene), an alkyne with the chemical formula HC\(\equiv\)CCH\(_{3}\)

The chemical formula CuCO₃ represents a compound of copper (Cu) and the carbonate ion (CO₃^2-). The carbonate ion has a charge of -2. To balance the charge, copper must have a +2 charge, as there is one copper atom and one carbonate ion. Therefore, the name of the compound is copper (II) carbonate.

A breathalyzer or breathalyser is a device used for estimating blood alcohol content (BAC), or to detect viruses or diseases from a breath sample.

A  mixture is a material made up of two or more different chemical substances which are not chemically combined. 

Mercury with the chemical symbol Hg and the atomic number 80 is an element that has not reacted with another substance. When mercury reacts with another substance, it forms a compound, such as inorganic mercury salts.

Bromine, with the symbol Br and atomic number 35, is the third-lightest halogen. It is a volatile red-brown liquid at room temperature that evaporates readily to form a similarly coloured vapour.

Atomic weight or Relative Atomic Mass is the ratio of the average mass of a chemical element's atoms to some standard, defined as the weighted average of the masses of the isotopes of an element compared to 1/12 of the mass of the carbon-12 atom. The formula for relative atomic mass is ∑isotope mass x isotope abundance / 100.