CHEM112 Final Exam Review

Front

What does the equilibrium constant (K) indicate about a chemical reaction?

Back

The equilibrium constant indicates the ratio of the concentrations of products to reactants at equilibrium. It helps predict the extent and direction of a reaction, but not the time required to reach equilibrium.

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Back

Front

What can be concluded about the concentrations of HCN and KCN in a buffer solution with pH 8.50 and pKa 9.31?

Back

Front

What role does iodide ion (I^-) play in the decomposition of hydrogen peroxide?

Back

Iodide ion (I^-) acts as a catalyst in the reaction.

Front

What is the solubility of a substance if it is 60 g per 100 mL of water at 15 °C?

Back

The solubility indicates that at 15 °C, a maximum of 60 g can dissolve in 100 mL of water.

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What is a supersaturated solution?

Back

A supersaturated solution contains more solute than can normally dissolve at a given temperature, often achieved by cooling a saturated solution.

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What is the significance of pKa in acid-base chemistry?

Back

pKa is the negative logarithm of the acid dissociation constant (Ka) and indicates the strength of an acid; lower pKa values correspond to stronger acids.

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How does temperature affect the solubility of solids in liquids?

Back

Generally, the solubility of solids in liquids increases with an increase in temperature.

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What is the difference between a saturated and an unsaturated solution?

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A saturated solution contains the maximum amount of solute that can dissolve at a given temperature, while an unsaturated solution can still dissolve more solute.

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What is a buffer solution?

Back

A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added, typically composed of a weak acid and its conjugate base.