Semester 2 Chemistry Multiple Choice
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FlashcardsWhat operation generally makes a solid solute dissolve faster in a liquid solvent?
Crushing the solute to a powder.
What happens when a small crystal of solute is added to an unsaturated solution?
The crystal will dissolve.
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36 Terms
What operation generally makes a solid solute dissolve faster in a liquid solvent?
Crushing the solute to a powder.
What happens when a small crystal of solute is added to an unsaturated solution?
The crystal will dissolve.
What volume of a 1.0 molar sulfuric acid is needed to prepare 2.0 liters of a 0.25 molar solution?
500 milliliters.
Which of the following is not an example of a colligative property?
Color change.
Which compound produces the greatest freezing point depression?
CaCl2.
What is the molality of a solution containing 1 mol of solute in 2 kg of solvent?
1.0 m.
What type of solution contains more solute than it can theoretically hold at a given temperature?
Supersaturated.
What does 'like dissolves like' mean?
Polar solutes dissolve in polar solvents.
Which factor does not affect the solubility of a gas in a liquid?
Volume of solute.
What change will increase the rate of a chemical reaction?
Increasing concentration.
What is activation energy?
The energy needed to start a reaction.
What does a catalyst do in a chemical reaction?
Speeds up the reaction without being consumed.
How does the rate of a chemical reaction change with temperature?
Decreases as the concentration of the reactants decreases.
What will not affect the equilibrium position of a reversible reaction?
A catalyst is added.
What happens when a catalyst is used in a reaction?
The energy of activation for the reaction decreases.
Which system has the greatest entropy?
10 mL of water vapor at 101 °C.
Which chemical/physical change shows decreasing entropy?
None of these.
Which combination makes the most efficient buffer?
NaCN and HCN.
What is the pH of a 0.010 M HNO3 solution?
Approximately 2.
Identify the Brønsted-Lowry base and conjugate base in the reaction CN⁻ + H2O ⇌ HCN + OH⁻.
H2O and OH⁻.
Which produces a solution with pH ≈ 7?
KCl.
Which forms a weak acid solution?
CH3COOH.
What is a Lewis base?
Donates a pair of electrons.
What color does a solution with [H⁺] = 6.0 × 10⁻⁴ M turn with phenolphthalein?
Colorless.
How is benzoic acid classified based on its Ka value?
Relatively weak H⁺ donor.
What is the conjugate base of chlorous acid (HClO₂)?
ClO₂⁻.
What happens in a reaction with strong acid added to HCN/CN⁻ buffer?
CN⁻ + H⁺ → HCN.
Where does oxidation occur in a voltaic cell?
At the anode.
Who is the reducing agent in the reaction 2Na + 2H2O → 2NaOH + H2?
Na.
In the potassium and chlorine reaction (2K + Cl2 → 2KCl), what happens to K?
K is oxidized to K⁺.
What is electrolysis?
Electrical energy causes a chemical change.
In which compound is sulfur NOT +6?
S2O3²⁻.
Which is NOT a reduction?
Losing electrons.
How can you distinguish the electrolysis of water?
All of the above.
What is the anode when plating silver onto a teaspoon?
Silver rod.
In the reaction H⁺ + HSO3⁻ → H2O + SO2, what is reduced?
Not a redox reaction.