2021 - JAMB Chemistry Past Questions and Answers - page 1
What is the common name for the following compound (CH\(_{3}\))\(_{2}\) CH CH\(_{2}\) -Br
Isobutyl bromide
Methyl bromide
propyl bromide
Butyl bromide
The common name: Isobutyl bromide
The IUPAC name: 1-Bromo-2-methylpropane
Formula: C\(_4\)H\(_9\)Br
The enzyme that converts glucose to ethyl alcohol is?
maltase
zymase
Diatase
Invertase
Zymase is an enzyme complex that catalyzes the fermentation of sugar into ethanol and carbon dioxide. It occurs naturally in yeasts. More
The scientist who stated that matter can be converted into energy is?
Boyle
Lavoiser
Avogadro
Einstein
Albert Einstein's theory of special relativity defines the relationship between mass and energy, E = mc^2
What is the IUPAC name for the following compound? HC\(\equiv\)CCH\(_{3}\)
Acetylene
Methylacetylene
Butanol
Decanoic acid
Propyne (methylacetylene), an alkyne with the chemical formula HC\(\equiv\)CCH\(_{3}\)
What is the chemical name for the compound CuCO\(_{3}\)?
Copper (iii) carbonate
Copper (ii) carbonate
Copper (i) carbonate
Copper
Copper(II) carbonate or cupric carbonate. Chemical compound formula CuCO\(_{3}\)
A 'breath test' used by traffic police to check drunken driving uses?
Tumeric on filter paper
Silica gel coated with saliva nitrate
Potassium permanganate-sulphuric acid
Potassium dichromatic-sulphuric acid
A breathalyzer or breathalyser is a device used for estimating blood alcohol content (BAC), or to detect viruses or diseases from a breath sample.
Which one of the following is not a mixture?
Air
Mercury
Milk
Cement
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.
Which of the following is a non-metal that remains liquid at room temperature?
Chlorine
Phosphorus
Bromine
Helium
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.
Which of the following are chemical changes?
I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up
I and II
I, II, and III
III and IV
all of the above
The atomic weight of nitrogen is?
10
12
14
16
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.