experiment: making observations and inferences

Y E A R 8 – S T U D E N T R E S E A R C H P R O J E C T

MAKING OBSERVATIONS AND INFERENCES

AIM

• To observe a variety of chemical reactions and make inferences.

EQUIPMENT

• dilute hydrochloric acid (1 M)

• dilute sodium hydroxide solution (1 M)

• dilute sulfuric acid (1 M)• sodium thiosulfate crystals• 2 small pieces of magnesium

ribbon• copper sulfate solution (0.1

M)• barium chloride solution (0.1

M)

• marble chip• potassium

permanganate solution (0.001 M)

• hydrogen peroxide (3% solution)

• 7 test tubes• test tube rack• test tube holder

RISK ASSESSMENT

Risk Injury Prevention

Write a risk assessment for your experiment here

METHOD

1. Number the seven test tubes.

2. Carry out the seven reactions below. For each reaction record your observations and make inferences for each of the reactions in your results table.

Reaction 1• Put a piece of magnesium in the test tube and add a small

amount of dilute hydrochloric acid. Don’t forget to point the test tube away from yourself and other people, and wear safety glasses.

METHOD

Reaction 2• One-third fill the test tube with copper sulfate solution. Add a piece

of magnesium.

Reaction 3• One-third fill the test tube with water. Add about a spatula of hypo

crystals and shake to dissolve.

Reaction 4• Add a small amount of copper sulfate solution to a test tube. Then

add a small amount of sodium hydroxide solution (caustic soda) and let the test tube stand for a few minutes.

METHOD

Reaction 5• Add a small amount of barium chloride to a test tube. Then add

a small amount of sulfuric acid.

Reaction 6• Put a marble chip in the test tube and add a small amount of

dilute hydrochloric acid.

Reaction 7• Add a small amount of potassium permanganate solution to a

test tube. Then add 2 or 3 drops of hydrogen peroxide.

RESULTS

• Write a heading for your table.

Reaction Observation Inference1

2

3

4

5

6

7

CONCLUSION

• Write your conclusion here.