Chemistry 101  Lab Quiz #1        9/15/98

1. Place the number 1 at your location in the lab
2. Place the number 2 at the location of the closest eye wash.
3. Place the number 3 at the location of the closest fire extinguisher
4. Place the number 4 at the location of the closest shower.
5. Place the number 5 at the location of the fire blanket.














6.                       A container weighed 8.0 grams.  When 5 mL of an unknown liquid was
             placed in the container, it now weighed 13.0 grams.  What is its density?

7. __________ An irregular solid had a mass of 10.0 grams.  It was placed in a graduated cylinder 
                          which had 14 mL of water.  The water level was raised to 16 mL.  What is the
            density of the solid?

8- 10   A mixture of sand, salt, and ammonium chloride was placed in a preweighed evaporating
     dish #1. Dish #1 has a mass of 110 grams.  When the  mixture was placed in the dish, it    now weighed 119 grams. The dish was heated  and white fumes were driven off.  After   cooling,  the dish weighed 117 grams. Water was added to the mixture, and the liquid was poured off into another preweighed evaporating dish #2.  Dish #2 weighed 105 grams.  Both dishes were heated to dryness.  Dish #1 weighed 113 grams.  Dish #2 weighed 109 grams. (Draw out what is in each dish to help you answer the questions)

8. ____________ What were the fumes driven off  in the first heating of dish #1?

9. ____________ How many grams ammonium chloride were present?

10. ___________ What is the percent sand in the mixture?