TRUE OR FALSE a) An electrolyte is a solvent that, when dissolved in water, caus
ID: 538052 • Letter: T
Question
TRUE OR FALSE
a) An electrolyte is a solvent that, when dissolved in water, causes the solution to conduct electricity
b) In an aqueous solution of sugar, the sugar is the solute
c) If 500.0 mL of a sugar/water solution contrain 0.30 moles of sugar, then the molarity of the solution is 0.60 molar
d) If 50.0 mL of a KOH solution require 35.0 mL of 6.0 M HCl solution to reach the equivalence point of a titration then the molarity of the KOH solution is 4.2 molar
e) If a solution containing dissolved barium ions is mixed with a solution containing dissolved chloride ions, no precipitate should form
f) If 50.0 mL of a 9.0 molar salt water solution are diluted by adding 25.0 mL of additional water, the resulting molarity of the diluted solution is 4.5 molar
g) When the volume of a system increases at constant pressure, the work that occures will be nagative
h) If 2.5 moles of an ideal gas are contained in a volume of 7.5 L and at a temperature of 323 K then the pressure of the gas will be 8.8 atm
i) For a fixed amount of an ideal gas at constant pressure, if the temperature of the gas is decreased then the volume of the gas will decrease
j) A small value of heat capacity indicates that the temperature of a system will rise significantly when heat is absorbed compared to a system with a large heat capacity
k) If a system loses 500 calories of heat and has 500 calories of work done it then the change in internal energy (Delta E) of the system will be -1000 calories
Explanation / Answer
Ans
a ) True
The electrolyte contains positively and negatively charged ions , which when dissolved in the water , gets dissociated and the solution starts conducting electricity .
b ) True
The aqueous solution means that the major part of the solution is made up of water that is solvent.
c) True
Molarity = number of moles of solute / volume of solution in L
M = 0.30 / 0.5 = 0.60 M
d) True
using the formula M1 V1 = M2 V2
where M is the molarity and V is the volume
M1 x 50 = 6 x 35
M1 = 4.2 M
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