1.Oil floats in water. The most accurate reason for this is that
A oil is less dense than water
C. oil is both less dense and immiscible
Boil is immiscible in water
D. oil is heavier than water
2.Which among the methods below is the best to separate a solute from a solvent in a solution?
A distillation
C. sedimentation
B filtration
D. all of these
3.What is the concentration of a solution in% by mass if it contains 25g of sugar in 150g of
solution?
A 16.67%
B.16.68%
C. 16.69%
D. 16.7%
4. Determine the percent composition by mass of a 100g salt solution which contains 20g salt.
sand
A. 20
B. 21%
C.22%
D. 23%
5. What is the concentration of a solution with 40mL of ethanol mixed with 180mL of water?
A 33.33%
B. 33.32%
C. 33.31%
D. 33.30%
6. What is percent by volume of ethanol in a solution that contains 45 mL of ethanol dissolved
in 125mL of water?
A. 26,7
B. 36.7%
C. 46.7%
D. 56.7%
7.Solve for the recent by volume of an isopropyl in a solution that contains 45 mL of ethanol
dissolved in 125 ml of water.
A 29.79%
B. 28.79%
C. 27.7%
D. 26.7%
8.Compute the concentration of a solution in % by mass if it contains 25g of salt in 150g of
solution?
A 16.60
B.16.69%
C. 16.68%
D. 16.67%​