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Knewton's Unit 7 test- with Questions with 100% Correct Answers
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Knewton's Unit 7 test- with Questionswith 100% Correct Answers
A teaspoon of table sugar contains about 0.01 mol sucrose. What is the molarity of
sucrose if a teaspoon of sugar has been dissolved in a cup of tea with a volume of
200 mL? - Answer 0.05 M
0.10 moles of sodium sulfate is dissolved into 12 mL of solution. What is the
molar concentration of the solution? - Answer 8.3
100. grams of ammonia (NH3) is dissolved in a 8.3 L solution. What is the molarity of
the resulting solution? - Answer 0.71 M
Compare 1 mole of Hydrogen with 1 mole of Oxygen. They will have: - Answer The same
number of atoms and different masses.
A mole of one element contains _______ number of atoms as a mole of another
element. - Answer The same
0.60 moles of magnesium nitrate in 4.0 L of solution has a concentration of: - Answer
0.15 M
What would be the molarity of a solution made from 86.5 g Ca(OH)2in 200.0 ml of
water? - Answer 5.84 M
,An electrolyte will yield ions by undergoing a: - Answer Depends on the substance
How do we physically measure conductance?
applying a voltage to electrodes immersed in solution
measuring electrical current flow
observing the brightness of a light bulb in a circuit - Answer All of the above
Which of the following are characteristics of strong electrolytes? (select all that apply)
They exhibit no conductivity.
They produce a high concentration of ions when dissolved in water.
They are insoluble in water.
They exhibit high conductivity. - Answer They produce a high concentration of
ions when dissolved in water.
They exhibit high conductivity.
Of the following, which are characteristics of weak electrolytes? (select all that apply)
, They produce a low concentration of ions when dissolved in water.
They are soluble in water.
They exhibit no conductivity.
They exhibit low conductivity. - Answer They produce a low concentration of ions
when dissolved in water.
They are soluble in water.
They exhibit low conductivity.
If a supersaturated solution is introduced to a mechanical disturbance or a seed
crystal, what will happen? - Answer Some solute will precipitate
The term unsaturated best fits which of the following descriptions? - Answer
Unsaturated" describes a solution with a solute concentration less than its solubility
value.
Classify the tonicity of a solution made by dissolving 12mg of sodium chloride in 1.0mL
of water. - Answer The solution is hypertonic because it has a 1.2%m/v concentration
of sodium chloride.
Citric acid is found in __________. - Answer Carbohydrate digestion
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