CH301 Unit 2 Practice Problems

QT2.1 Q1: Most Polar Bond
- Question: Which two elements will form the most polar bond?
- Options:
- a) S and Cl
- b) P and F
- c) O and N
- d) H and C
- Answer Explanation: The bond polarity depends on the difference in electronegativity between the two elements. Polar bonds occur when there is a significant difference in electronegativity between the bonded atoms.
QT2.1 Q2: Bond Polarity Ranking
- Question: Rank the bonds from least to most polar.
- Options:
- a) S-S < P-Cl < Si-F
- b) S-S < Si-F < P-Cl
- c) P-Cl < Si-F < S-S
- d) Si-F < P-Cl < S-S
- Answer Explanation: To rank these bonds, analyze each pair's electronegativities and their differences.

QT2.2 Q1: Incorrectly Matched Compound Names
- Question: Which of the following compound names is incorrectly matched with its formula?
- Options:
- a) Potassium nitrate – KNO3
- b) Calcium phosphate – Ca3(PO4)2
- c) Magnesium hydroxide – MgOH
- d) Aluminum sulfate – Al2(SO4)3
- Answer Explanation: Analyze the formulas and their corresponding names based on common naming conventions in chemistry.
QT2.2 Q2: A2B3 Compound Formation
- Question: Which of the following combinations would result in a compound with an A2B3 formula?
- Options:
- a) Al3+ and O2⁻
- b) Ca2+ and N3⁻
- c) Na+ and S2⁻
- d) Mg2+ and Cl⁻
- Answer Explanation: Determine the charge balance of ions to deduce the empirical formula of the resultant compound.

QT2.3 Q1: Highest Lattice Energy
- Question: Which of the following compounds is expected to have the highest lattice energy?
- Options:
- a) NaCl
- b) MgO
- c) KBr
- d) CaS
- Answer Explanation: Lattice energy is influenced by ion charges and the distance between them; use Coulomb's law to evaluate these compounds.
QT2.3 Q2: Lowest Lattice Energy
- Question: Which compound is expected to have the lowest lattice energy?
- Options:
- a) LiF
- b) MgCl2
- c) Al2O3
- d) CsI
- Answer Explanation: Similarly, analyze the ionic charges and sizes to determine the compound with the weakest lattice structure.