Packet for Cu lab, naming and writing formulas, reaction types and ...

M. Now circle the reactants, and put a square around the products. Remember to label each reactant and product as
(s), (l), (g), or (aq).
10) Clean your lab table! Use a piece of masking tape to label your 200mL beaker with your names, and place it in the area
marked for your block. Wash, rinse, and dry all other equipment and place back at your lab table. Wipe the table clean.
Make sure to wash your hands when you are finished for today!
Third Day in the lab!
Remember that last time we ended by converting Cu(OH)2 to CuO. You ended with a precipitate of CuO in your
beakers.
1) Retrieve your beaker with the copper II oxide and wash the solid material (called a precipitate) by adding a squirt of
distilled water. Stir. Allow to settle and decant the liquid again.
2) Go to the extraction hood and 50 ml of hydrochloric acid, HCl (aq) with the squeeze bottle. Stir until clear (which does
not necessarily mean colorless).
Observations before reaction
Observations during and after the reaction
11) CuO:
13) During reaction:
12) HCl:
14) After reaction:
A. What evidence of chemical change did you observe? ________________________________________________
____________________________________________________________________________________________
B. Was the reaction an exothermic or endothermic reaction? Describe your answer: ___________________________
____________________________________________________________________________________________
C. The reaction you completed is described below. Write it in symbols:
You got copper (II) chloride in water by adding diluted hydrochloric acid (HCl) in water to copper II oxide.
D. Now circle the reactants, and put a square around the products. Remember to label each reactant and product as
(s), (l), (g), or (aq).