quiz11 sec1
Quiz
•
Chemistry
•
11th Grade
•
Practice Problem
•
Hard
Marwan mamdouh
Used 3+ times
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21 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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)
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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.
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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.
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