WorksheetsSci7 - REVIEW CA1 (Q2)
Total questions: 10
Worksheet time: 2hrs 40mins
1. Hilary adds a spoonful of sugar into cold milk, while Nick adds a spoonful into hot milk. In which case will the sugar dissolve faster? Why?
A. The sugar will dissolve faster in Hilary's cold milk because of the low temperature of milk.
B. The sugar will dissolve faster in Nick's hot milk because of the high temperature of milk.
C. None of the two.
2. How does stirring a solution help in the rate of dissolution of a solute in a solvent?
A. It speeds up the rate of dissolution.
B. It decreases the rate of dissolution.
C. Stirring can't help in dissolution.
3. Which one will dissolve fastest in a solvent?
A. rock salt
B. powdered sugar
C. crystal sugar
4. What will a dilute solution of blue ink look like?
A. dark blue
B. white
C. light blue
5. ______ is the ability of of liquid to vaporize at normal temperature and pressure.
A. conductivity
B. volatility
C. osmosis
6. What do you call the temperature at which a liquid changes to gaseous state under normal pressure?
A. Boiling point
B. Freezing point
C. Conductivity
7. What is the role of the semipermeable membrane in osmosis?
A. It stops the osmotic pressure.
B. It blocks the solvent from passing.
C. It allows only solvent / small particles to pass through from low to high concentration areas.
8. Which of the following solutions is a good conductor of electricity?
A. Oil
B. salt solution
C. distilled water
9. Using this formula, find the percentage by mass of sugar in Gary's solution.
SOLUTE: (Sugar) 1.5 g
SOLVENT: (Water) 23.5 g
(a) sugar is present in 100 g of the sugar solution of Gary.
10. Using the formula, find the percentage by mass of salt in Cherry's solution.
mass solute (salt) : 1.5 g
mass solvent (water) : 73.5 g
The solution of Cherry is (a) salt by mass.
