quiz11 sec1

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)

• C₆H₁₂O_6(aq)

• FeCl_3(aq)

• BaCl_2(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