Standardized Test Prep
Some test questions may include a drawing of lab equipment. It is important that you carefully study the information presented in the question as well as the picture provided. Keep these tips in mind when answering a question with lab equipment drawings:
Identify the equipment shown so you can determine what information the drawing can or cannot give you.
Think of similar labs or questions you may have seen. These may help you determine the information available from the drawing.
The drawings may not be drawn to scale. You must read and interpret the scales and increments carefully.
Carefully read the question. You may not need all the information presented in the drawing or you may need more information than is presented in the drawing.
Practice using these tips in Question 6.
Which of the following will NOT increase the rate at which a solute dissolves in a solvent?
increasing the surface area of the solute
stirring the solvent
increasing the temperature
increasing the particle size of the solute
agitating the mixture
At 20°C, a saturated solution contains 36 g of NaCl and 100 mL of water. All the solid is dissolved. What happens if the solution is slowly cooled to 0°C?
It freezes.
It becomes supersaturated.
The pressure on it increases greatly.
More NaCl could be dissolved in it.
The NaCl reacts with the water.
Which pH indicates a solution of an acid?
pH = 3
pH = 7
pH = 9
pH = 14
pH = 19
Which substance is a weak base?
NaCl
NH3
HCl
HF
KOH
What reaction occurs when a solution of hydrochloric acid, HCl, is mixed with a solution of calcium hydroxide, Ca(OH)2?
If the contents of the two beakers shown above are mixed, the resulting solution
will turn red litmus paper blue.
will turn blue litmus paper red.
will resist large changes in pH.
will react with metals.
will not change the color of red or blue litmus paper.