Unit Test — Unit test Answers
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In a school’s laboratory, students require 50.0 mL of 2.50 M H2SO4 for an experiment, but the only available stock solution of the acid has a concentration of 18.0 M. What volume of the stock solution would they use to make the required solution?Use .
A
0.900 mLB
1.11 mLC
6.94 mLD
7.20 mL22
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Which best explains why water has a high specific heat?
A
Hydrogen bonds decrease the amount of energy that is required for the temperature to change.B
Hydrogen bonds increase the amount of energy that is required for the temperature to change.C
Ion-dipole interactions increase the amount of energy that is required for the temperature to change.D
Ion-dipole interactions decrease the amount of energy that is required for the temperature to change.23
The graph below shows how solubility changes with temperature.Which two solutions have similar solubilities at 40°C?
A
Na2SO4 and NaClB
Na2HAsO4 and NaClC
Na2HAsO4 and Na2SO4D
Ba(NO3)2 and Ce2(SO4)3 • 9H2O24
Josh prepares a solution by mixing sodium nitrate and water. To calculate the molarity of the solution, Josh should calculate the moles of which substance, and why?
A
sodium nitrate, because it is the solventB
sodium nitrate, because it is the soluteC
water, because it is the solventD
water, because it is the solute25
Shown below is an ion from a salt molecule.Which statement best explains the event?
A
This is hydration, which occurs during ionization.B
This is hydration, which occurs during dissociation.C
This is the formation of electrolytes during ionization.D
This is the formation of ions from a covalent compound.Did you find these answers helpful?
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