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.
I and Il only
I, II and IV only
II, IIl and IV only
I, II, III and IV
Correct answer is C
- CaCl2 is an ionic compound owing to the large electronegative difference between the calcium atom and chlorine atom, which is greater than 2.0. In calcium chloride, the calcium atom donates its two electrons and become cation whereas each chlorine atom gain one electron, donated by Calcium, and get a negative charge.
- Ionization energies are always positive numbers, because energy must be supplied (an endothermic energy change) to separate electrons from atoms.
- Chlorine has a high ionization energy
- Chlorine has high electron affinity among the elements. Its high affinity can be attributed to its large atomic radius, or size. Because chlorine's outermost orbital is 3p, its electrons have a large amount of space to share with an incoming electron.
amount of distilled water that is added to the concentrated solution to dilute it
Quantity of distilled water added to l dm\(^3\) of the concentrated solution to give the dilute solution
number of times the volume of the concentrated solution is diluted to give the dilute solution
act of diluting the concentrated solution to obtain the dilute solution
Correct answer is C
- Dilution Factor is the factor by which the stock solution is diluted. It may be expressed as the ratio of the volume of the final diluted solution (V2) to the initial volume removed from the stock solution (V1)
- The dilution factor is the total number of unit volumes in which your material will be dissolved.
which of the following quantities is a molar quantity?
Molarity
Molar mass
Mass concentration
Molality
Correct answer is C
No explanation has been provided for this answer.
Gaining of electrons
Hybridization of orbitals
Losing electrons
Sharing electron
Correct answer is B
- An atom may give, take, or share electrons with another atom to achieve a full valence shell, the most stable electron configuration.
- Hybrid orbitals are useful in the explanation of molecular geometry and atomic bonding properties and are symmetrically disposed in space.
The atomic number of an atom would be equal to its mass number if it
has a totally filled valence shell
has a high charge to mass ratio
does not contain neutrons
exhibits isotopy
Correct answer is C
- The mass number of an atom is its total number of protons and neutrons