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WorksheetsUnit 10 Review Part A
Total questions: 20
Worksheet time: 2hrs 40mins
Which of the following could be an indication that a chemical reaction has reached equilibrium?
The color of the system has stopped changing
The temperature of the system has stopped changing
Fizzing in the system has stopped
All of the above
Color and temperature only
Remember the reaction in the marble chip experiment? At what point did this reaction reach equilibrium?
When the fizzing started
In the middle of the fizzing
When the fizzing stopped
The reaction didn't reach equilibrium
What is "equal" at equilibrium?
All of the concentrations of the products and reactants
The total concentration of reactants compared to the total concentration of products.
The moles of reactants compared to the moles of products.
None of the above.
In the equilibrium experiment, what was the visual cue that the reaction had reached equilibrium?
The color stopped changing
The fizzing stopped
The temperature stopped increasing
None of the above
If a water bottle at room temperature is tightly capped and the contents reach equilibrium, what will be inside the bottle?
Liquid water only
Water vapor only
Liquid water and water vapor
Ice, liquid water, and water vapor
Choose the statement that is true about the equilibrium between HCl and NaOH
The reaction only reaches equilibrium once and only at pH 7, when the moles of acid and moles of base completely neutralize each other,
The reaction reached equilibrium twice, once at high pH with excess base and once at low pH with excess acid.
The reaction reaches equilibrium every time more HCl or more NaOH is added to the mixture
The reaction never reaches equilibrium because it is an open system.
In a system of HCl and NaOH at equilibrium, if we add more HCl, how will the reaction respond?
The reaction will go in the forward direction
The reaction will go in the reverse direction
Neither the forward direction nor the reverse direction will be favored.
None of the above
In a system of HCl and NaOH at equilibrium, if we add magnesium ions by adding magnesium chloride, the magnesium ions will form insoluble Mg(OH)2. How will this affect the HCl/NaOH equilibrium?
The HCl/NaOH reaction will run in the forward direction
The HCl/NaOH reaction will run in the reverse direction
Neither the forward direction nor the reverse direction will be favored
None of the above
If the HCl/NaOH system is at equilibrium and we add a solution of AgNO3, an insoluble solid, AgCl will form. How will the HCl/NaOH reaction respond?
The reaction will be pushed in the forward direction
The reaction will be pushed in the reverse direction
Neither the forward nor the reverse direction will be favored
None of the above
If the HCl/NaOH system is at equilibrium and we add distilled water to the beaker, how will the reaction respond?
The reaction will be pushed in the forward direction.
The reaction will be pushed in the reverse direction
Neither the forward nor reverse direction will be favored
None of the above
Choose the response that is not a common property of acids.
Tastes sour if edible
Electrolytes
High pH
Oxidize metals
What is the ion that is responsible for acidic behavior?
H+
OH-
Na+
CH3COO-
What ions are the most common bases?
H+, OH-, CO32-
H+, SO42-, OH-
OH-, CO32-, PO43-
OH-, CO32-, SO42-
Choose the property that is not a typical property of bases
Electrolytes
Oxidize metals
High pH
Very hard on skin
Why are indicators often necessary in acid-base chemistry?
Acids and bases are often colorless in solution
Acids and bases are always electrolytes
Acids and bases are nearly always soluble in water
Acids and bases have opposite pH's
pH is a measurement of what property?
Solubility
Gas production (fizzing)
H+ molarity
Electric conductivity in solution
Why is phenolphthalein a popular indicator for acid-base titrations?
It shows color changes across a wide span of pH values
It changes color very near neutral pH
The color change is easy to see
The color change is reversible
25.0 mL of 0.100 M HCl was needed to titrate 32.00 mL of NaOH. What was the molarity of the NaOH?
0.100 M
0.078 M
0.128 M
0.250 M
28.25 mL of a NaOH solution required 15.00 mL of 0.125 M HCl for titration. What was the molarity of the NaOH?
0.235 M
0.125 M
0.066 M
0.011 M
What does the term "neutral" mean in the context of acids and bases?
There are no excess Na+ or Cl- ions in the solution
There are no excess H+ or OH- ions in the solution
There are more H+ ions than OH- ions in the solution
There are more OH- ions than H+ ions in the solution
