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Worksheetsquiz11 sec1
Total questions: 21
Worksheet time: 2hrs 45mins
10 mL of 6 M hydrochloric acid were diluted with water until the concentration became 0.5 M, what is the volume of the added water?
50 mL
110 mL
120 mL
290 mL
50 g of a 26% (m/m) solution was mixed together with 130 g of a 17% (m/m) solution. What is the percentage concentration by mass of the new solution?
19.5% (m/m)
15% (m/m)
5% (m/m)
43% (m/m)
35% (m/m)
Calculate the mass of a sodium carbonate’s solution whose mass percentage is 20%, and it contains 0.5 mol of the solute.
[Na=23g/mol, C=12g/mol, O=16g/mol]
250 g
150 g
200 g
100 g
Calculate the mass of a sodium carbonate’s solution whose mass percentage is 20%, and it contains 0.5 mol of the solute.
[Na=23g/mol, C=12g/mol, O=16g/mol]
265 g
255 g
38 g
530 g
Which of the following is true about an ethanol solution of 70% percentage concentration?
Every 100 mol of the ethanol solution contains 70 mol of ethanol and 30 mol of water.
Every 100 mL of the ethanol solution contains 70 mL of water and 30 mL of ethanol.
Every 100 L of the ethanol solution contains 70 mol of ethanol and 30 mol of water.
Every 100 mL of the ethanol solution contains 70 mL of ethanol and 30 mL of water.
Which of the following statements best describes the concentration of a solution?
How reactive a solute is with water
The amount of solvent dissolved in a certain volume of solute
The amount of solute dissolved in a certain volume of solution
How quickly a solute dissolves in a solvent
The smallest amount of water needed to dissolve a solute
Hydrogen gas is collected when it is prepared in lab by downward displacement of water, the pressure produced on the surface of water is the sum of the pressure of hydrogen gas and the pressure of …………
Oxygen gas.
Water vapour.
Hydrogen dissolved in water.
The noble gases found in air.
A solid substance (X) its boiling point is 948°C, it dissolves in water forming a solution whose boiling point is .........
98°C
102°C
946°C
950°C
Which of the following equally concentrated solutions has lower freezing point?
NaCl(aq)
C6H12O6(aq)
FeCl3(aq)
BaCl2(aq)
Which of the following factors does not affect the vapor pressure of a liquid?
Volume of the liquid
Temperature
Intermolecular forces
Concentration of solutions
If the following solutions of equal molar concentrations are put in the freezer, which of them will be the last to freeze?
Table sugar solution
Ferric chloride solution
Table salt solution
Silver nitrate solution
The particles that form the solution ………
are invisible.
are visible.
can be separated by filtration.
scatter the light.
When a light beam falls on a glass beaker contains a mixture of water and silt, it is scattered, this indicates that the mixture is ..............
a colloidal system.
homogeneous.
suspension system.
a solution.
Which of the following is not a colloid?
Milk powder in water.
Dust in air.
Calcium nitrate powder in water.
Paints.
Which of the following separation methods proves that sodium chloride is a solute in sea water?
Condensation.
Fractional distillation.
Vapourization
Filtration
Why does heating a solution, and evaporating some of the solvent, induce crystallization?
Heating causes the solute to oxidize and form crystals.
The solution becomes supersaturated and, upon cooling, causes crystals to form.
Heating causes the solute to oxidize and form crystals.
A higher temperature reduces the amount of solute that dissolves in a solvent.
What separation process was used to remove the salt?
Evaporation
Filtration
Chromatography
Crystallization
Distillation
In chemistry, which kind of technique are both filtration and crystallization considered to be?
Precipitation
Quenching
Distillation
Separation
Calibration
Consider a mixture of methanol whose boiling point is 64.7∘C and water whose boiling point is 100∘C.Which of the following methods can be used to separate this mixture?
Filtration
Chromatography
Crystallization
Fractional distillation
Evaporation
Which of the following processes does not take place during distillation?
Precipitation
Evaporation
Condensation
Heating
A mixture of sand and water is filtered in a chemistry laboratory using gravity filtration. Which of the following statements correctly describes the results of this procedure?
The water, known as the residue, passes into the Erlenmeyer flask.
The sand, known as the residue, is left in the filter paper.
The sand, known as the residue, passes into the Erlenmeyer flask.
The sand, known as the filtrate, is left in the filter paper.
The water, known as the residue, is left in the filter paper.
