21. Which of the following is NOT soluble in water?
A. Naphthalene
B. Salt
C. Sugar
D. Vinegar
22. Which of the following liquids do not mix with water?
A. Liquid soap
B. Oil
C. Soy sauce
D. Vinegar
23. In solutions, the additive is called the while the substance that dissolves the first is called the
A. solute: solvent
B. solvent: solute
C. seasoning: water
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 concentrate
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​