Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
Stoichiometry is based on the law?
multiple proportion
constant composition
conservation of energy
conservation of mass
Correct answer is D
The principles of stoichiometry are based upon the law of conservation of mass. Matter can neither be created nor destroyed, so the mass of every element present in the product(s) of a chemical reaction must be equal to the mass of each and every element present in the reactant(s).
How many moles of carbon(iv)oxide contains 16.0g of oxygen? [ C = 12.0, O = 16.0 ]
0.20 mol
0.25 mol
0.40 mol
0.50 mol
Correct answer is D
1 Mole of carbon(iv)oxide contains 32g of Oxygen
: 0.5 Mole of carbon(iv)oxide contains 16g of Oxygen
Saturated
Unsaturated
Concentrated
Diluted
Correct answer is A
The term saturated solution is defined in chemistry as a solution in which no more solute can be dissolved in the solvent.
Ethene and Ethyne
Ethane and Ethene
Carbon (ii) Oxide and Ethene
Carbon (iv) Oxide and Ethyne
Correct answer is C
Ethene = 28
Ethyne = 26
Carbon(ii)Oxide = 28
Carbon(iv)Oxide = 44
Which of the substances is non-polar?
Bromine
Ammonia
Water
Hydrogen Bromide
Correct answer is A
Br2 (Bromine) is nonpolar because, in this molecule, both bromine atoms have the same electronegativity due to which both atoms have equal charge distribution and results in a net-zero dipole moment.