White Powder Analysis Pre-Lab Quiz

How many of the powders will be soluble in water?

• 3

• 5

• 7

• 10

The iodine reagent test is used to identify which powder?

• Sucrose

• CaSO4

• CaCO3

• Cornstarch

How many "dump and refill" steps are in the flow chart? (answer with a number)

Which powder is identified through precipitate formation (gel-like beads) when sodium hydroxide is added to the dissolved sample?

• NaOH

• MgSO4

• H3BO3

• NaCl

Which powder is more soluble in hot water?

• Sugar

• Salt

If you know you will be running chemical testing with the powders, what is the first thing you should do upon starting your process?

• Portion out a small sample of each unknown powder

• Refill the distilled water bottle

• Put a drop of iodine in three test tubes

• Start a beaker of water on a hot plate

Your unknown powder is non-soluble in water, turns brown when iodine is added and has no reaction with vinegar. What is it?

• NaCO3

• CaSO4

• NaOH

• CaCO3

Isopropyl alcohol is used to determine the identity of which powder(s)?

• H3BO3

• Sucrose

• NaCl

• NaHCO3

The phenolphthalein test will differentiate which powders need to be tested with vinegar on what basis?

• The solution will turn dark blue

• The solution will turn yellow-brown

• The solution will turn light, cloudy pink

• The solution will turn dark, fuchsia pink

Which of the following powders would indicated Boscoe Balmer as the culprit?

• Cornstarch

• Magnesium sulfate

• Calcium carbonate

• Calcium sulfate