Chemical Reactions Procedure

Step 1

Use fine sandpaper to clean a piece of copper wire until the wire is shiny. Note appearance of wire.

Step 2

Using crucible tongs, hold the wire in the hottest part of a burner flame for 1-2 minutes. Examine wire and note change in appearance caused by heating.

What king of tongs should you be using?

crucible

Step 3

Place evaporating dish near base of burner. Examine magnesium ribbon. Using crucible tongs, hold sample in burner flame until magnesium burns. When the ribbon stops burning, put the remains in the evaporating dish. Examine carefully.

Warning of Step 3

Do not look directly at the flame. Hold the burning magnesium away from you and directly over the evaporating dish.

Step 4

Place 2 heaping micro spatulas of copper(II) carbonate in a clean, dry test tube. Note appearance.

What is the measurement of copper(II) carbonate

2 heaping micropatulas

copper(II) carbonate

CuCO3

Step 5

Using test tube holder, heat copper(II) carbonate strongly for 3 min. Extinguish flame and insert a burning wood split into test tube. If carbon dioxide has is present, it will put flame out. Note change in appearance of residue.

What do you insert as a splint?

A burning wood splint

Carbon dioxide gas

CO2

When will the flame be put out in Step 5?

When CO2 is present

Step 6

Stand a clean, dry test tube in test tube rack. Add 5 mL of 6 M hydrochloric acid to tube. Carefully drop small piece of zinc metal into the acid in test tube. Observe and record.

Caution in Step 6

Handle acids with care. They can cause painful burns. Do not inhale any HCL fumes

How much hydrochloric acid?

5 mL

Step 7

Using test tube holder, invert second test tube over mouth of test tube which reaction takes place. remove inverted tube after 30 sec and quickly insert a burning wood splint into mouth of tube. Note appearance of substance in reaction tube.

What indicates the presence of hydrogen gas

a pop

Step 8

Add about 5 mL of 1 M copper(II) sulfate solution to a clean, dry test tube. Place small amount of zinc metal in solution. Note appearance of solution and zinc before and after reaction.

How much copper(II) sulfate

5 mL

copper(II) sulfate

CuSO4

Step 9

Add 2 mL of 0.1 M zinc acetate to a clean, dry test tube. Add 2 mL of 0.1 M sodium phosphate tribasic solution to tube Observe and note changes in mixture.

How much zinc acetate

2 mL

zinc acetate

Zn(C2H3O2)2

How much sodium phosphate tribasic solution

2 mL

sodium phosphate tribasic solution

Na3PO4

Step 10

Add 5 mL of 1 M sodium sulfite solution to a clean, dry test tube. Add 1 mL of 6 M HCL. Note odor.

How to note odor in Step 10

Waft gas toward your nose. Do not smell the gas directly.

How much sodium sulfite

5 mL

sodium sulfite

Na2SO3

How much hydrochloric acid

1 mL

hydrochloric acid

HCl

zinc metal

Zn

How should the test tube be?

clean and dry