GENCHEM 2 3rd Quarter Additional Reviewer Quiz
Medium-difficulty multiple-choice quiz covering key concepts in Intermolecular Forces, Physical Properties of Solutions, Thermochemistry, and Chemical Kinetics from the reviewer material.
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Quiz Questions & Answers
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Question 1: Which type of intermolecular force is the weakest and exists in all molecules, particularly non-polar ones like methane (CH4)?
Hydrogen Bonding
Dipole-Dipole
Ion-Dipole
London Dispersion
Question 2: In the context of types of solids, which example represents a molecular solid, where intermolecular forces hold the molecules together?
NaCl (Ionic)
Diamond (Network/Covalent)
Copper (Metallic)
Ice (H2O)
Question 3: What is a state function in the physical properties of solutions, and why is density considered one?
A path-dependent property affected by the process
A value that depends only on the initial state
A value that depends on the state of the substance, not how it was reached
Question 4: Enthalpy change (∆H) in thermochemistry refers to the heat evolved or absorbed during a reaction under what condition?
Constant volume
Constant temperature only
Constant pressure
Question 5: Entropy (∆S) measures the change in molecular disorder between initial and final states. Which scenario best illustrates increasing entropy?
Freezing water into ice
A cup of hot chocolate cooling and dissipating heat into the air
Question 6: In chemical kinetics, how does increasing the surface area of reactants affect the reaction rate, and provide an example application?
Decreases the rate by trapping molecules
No effect, as only concentration matters
Increases the rate; e.g., crushing tablets for faster dissolution
Question 7: What role does a catalyst play in affecting the reaction rate, according to the factors in chemical kinetics?
It permanently changes the products
It increases activation energy
It provides a pathway with lower activation energy and is regenerated
Question 8: In chemical kinetics, why does higher concentration generally lead to a faster reaction rate, and what is a practical example?
It decreases molecular collisions
It traps molecules in a phase
More reactant molecules increase collision frequency; e.g., concentrated bleach for tough stains