Chemistry Semester B Exam Questions With
Verified Answers
1. Which solution would be least likely to carry an electric current? - answer✔C6H12O6
Which pair of compounds is immiscible? - answer✔water and toluene
Agitation prevents settling in a(n) - answer✔suspension
The substance dissolved in a homogeneous mixture is the
____________________________. - answer✔solute
Which type of mixture contains the smallest particles? - answer✔solutions
Henry's law relates - answer✔pressure to gas-liquid solubility.
When the energy released by the formation of solvent-solute attractions is greater than the
energy absorbed by overcoming solute-solute and solvent-solvent attractions, the dissolving
process - answer✔has a negative enthalpy of solution.
Effervescence is the - answer✔escape of a gas from a gas-liquid solution.
A substance that does not dissolve in a polar solvent is probably
____________________________. - answer✔nonpolar
All of the following are heterogeneous mixtures except - answer✔tap water.
Under which conditions is more CO2 dissolved in a carbonated beverage? - answer✔in an
unopened bottle in the refrigerator
Raising the temperature of a solvent causes solvent-solvent collisions to become -
answer✔more frequent and more energetic.
In a solution at equilibrium, - answer✔the rate of dissolution and the rate of crystallization are
equal.
In 100 mL of cold water, 35 g of NaCl will dissolve, but 70 g will not. This observation implies
that - answer✔solubility depends on the amounts of solute and solvent present.
To carry an electric current, a solution must contain
____________________________. - answer✔ions
NaOH solution contains 1.90 mol of NaOH (molar mass = 40.00 g/mol), and its concentration is
0.555 M. What is its volume? ___________L - answer✔3.42
Molecules whose water solutions can carry electric current - answer✔ionize in water
A dissolved solute that does not form ions is a ____________. - answer✔nonelectrolyte
Which of the following does not increase the rate at which a solid dissolves in water? -
answer✔using large pieces of the solid
What is the concentration of a 100. mL aqueous solution that contains 1.00 g KCl (molar mass =
74.55 g/mol)? Give your answer to the nearest thousandth Molar. Give only the number. -
answer✔0.134
What mass of NaCl (molar mass = 58.44 g/mol) is needed to make a 1.50 m solution using 300.
g of solvent? - answer✔26.3 g NaCl
The solubility of CuCl2(s) would ____________________________ with increasing solvent
temperature. - answer✔increase
Unit 2 - answer✔Test 2
Substances which change color in the presence of acids or bases are called _____. -
answer✔indicators
The top industrial chemical produced in the United States for many years has been -
answer✔sulfuric acid
Which is not a property of water that is a result of its hydrogen bonding? - answer✔Water has
an unusually high freezing point.
Complete the following table, which deals with pH, [H+],acidity, neutrality and basicity.
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