كويز لمادة اساسيات الكيمياء العامة

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1. What is the solvent in a solution?

1 point

a) The substance present in the smaller amount

b) The substance present in the larger amount

c) The substance that dissolves in the solution

d) The substance that precipitates out of the solution

2. What is a solution?

1 point

a) A homogeneous mixture of two or more substances

b) A heterogeneous mixture of two or more substances

c) A pure substance

d) A mixture of solvents

3. What are the three types of interactions in the solution process?

1 point

a) Solvent-solvent, solute-solute, and solvent-solute interactions

b) Ionic, covalent, and metallic interactions

c) Hydrogen bonding, dipole-dipole, and London dispersion forces

d) Physical, chemical, and biological interactions

Clear selection

4. What is the formula for calculating molarity?

1 point

a) M = moles of solute / liters of solution

b) M = moles of solute / mass of solvent (kg)

c) M = moles of solute / moles of solvent

d) M = mass of solute / liters of solution

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5. Calculate the molality of a sulfuric acid solution containing 24.4 g of sulfuric acid in 198 g of water. (Molar mass of sulfuric acid = 98.09 g/mol)

1 point

a) 0.67 m

b) 1.26 m

c) 2.73 m

d) 7.79 m

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6. Which of the following is a colligative property of a solution?

1 point

a) Color

b) Density

c) Boiling point elevation

d) pH

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7. According to Raoult's law, what is the relation between the vapor pressure of the solvent and the mole fraction of the solvent in the solution?

1 point

a) P1 = X1 * P0

b) P0 = X1 * P1

c) P1 = X2 * P0

d) P0 = X2 * P1

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8. What is the formula for calculating vapor-pressure lowering?

1 point

a) DP = X1 * P0

b) DP = X2 * P0

c) DP = P0 - P1

d) DP = P1 - P0

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9. What is the molality of a solution if the freezing point depression is 7.79°C? (Given: Kf of water = 1.86°C/m)

1 point

a) 0.67 m

b) 1.26 m

c) 2.73 m

d) 7.79 m

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10. Osmotic pressure is the pressure required to stop:

1 point

a) Boiling

b) Freezing

c) Condensation

d) Osmosis

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11. A compound with the empirical formula C5H4 is dissolved in benzene, and the freezing point of the solution is lowered by 1.05°C compared to pure benzene. What is the molar mass and molecular formula of the compound? (Given: Kf of benzene = 5.12°C/m)

1 point

a) Molar mass = 78.13 g/mol, Molecular formula = C5H4

b) Molar mass = 156.26 g/mol, Molecular formula = C10H8

c) Molar mass = 156.26 g/mol, Molecular formula = (C5H4)2

d) Molar mass = 78.13 g/mol, Molecular formula = (C5H4)2

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12. A solution containing 35.0 g of hemoglobin (Hb) in enough water to make up 1 L in volume has an osmotic pressure of 10.0 mmHg at 25°C. What is the molar mass of hemoglobin?

1 point

a) 64.7 g/mol

b) 128.4 g/mol

c) 256.8 g/mol

d) 513.6 g/mol

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