21. Which of the following is NOT soluble in water?
A. Naphthalene C. Sugar
B. Salt D. Vinegar
22. Which of the following liquids do not mix with water?
A. Liquid soap C. Soy sauce
B. Oil D. Vinegar
23. In solutions, the additive is called the _________, while the substance that
dissolves the first is called the ________.
A. solute: solvent C. seasoning: water
B. solvent: solute D. solubility: concentration
24. Solubility is measured in terms of __________.
A. how much solute is dissolved in the solvent
B. how much solvent is dissolved in the solute
C. how much solute can be dissolved in a fixed amount of solvent
D. how much solvent can be dissolved in a fixed amount of solute

25. Which of the following salt solutions is the most concentrated?
A. 20 grams of salt dissolved in 100 mL of water
B. 30 grams of salt dissolved in 100 mL of water
C. 30 grams of salt dissolved in 200 mL of water
D. 50 grams of salt dissolved in 200 mL of water

26. What is the distinction between a suspension and a solution? A suspension
is__________
A. more concentrated that a solution.
B. less concentrated than a solution.
C. heterogeneous while a solution is homogeneous.
D. homogeneous while a solution is heterogeneous.
27. Why should medicines prepared as suspensions be shaken well before use?
A. to mix in the powder drug that may have settled at the bottom
B. to make sure the flavors are mixed in so the dose will not taste bitter
C. to make the suspension turn into a colloid first before getting a dose
D. to make the suspension turn into a solution first before getting a dose
28. What is the difference between a suspension and a colloid? Suspensions__
A. are for medicines while colloids are for food.
B. are heterogeneous while colloids are homogeneous.
C. lose their consistency while colloids remain consistent.
D. may either be solids, liquids, or gases, while colloids are all liquids.
29. Janina made some fruit juice by mixing pineapples water and some sugar using
a blender.
She left her juice in the blender and later she found some pulp at the bottom. She
poured out a
glass for her brother Joshua, and then she turned on the blender again for few
seconds, and
then poured out the remainder to another for herself. What did Joshua and Janina
drink?
A. Joshua had a solution, while Janina has a suspension.
B. Joshua has a suspension, while Janina has a solution.
C. They both had solutions.
D. They both had suspensions.
30. Colloids are ________.
A. homogeneous mixtures that seem to be heterogeneous