1. Identify the pieces of metal and then complete the table below.

2. Compare the pieces of metal for the following properties a) strength, b) density and c) hardness

3. Which of the metals conduct electricity ? Can you detect any difference between how well they conduct electricity ?

4. Compare the thermal conductivities of the metals. (Do NOT do this experiment with lead.)

5. Describe clearly how you compared the thermal conductivities of the metals. Say why we did not do the experiment with lead.

6. All the metals used in the experiments are elements. What is an element ?

7. Make lists of possible uses of the these five metals bearing in mind the properties which we have observed. In each case state which property is relevant to the use you are describing.

8. What is an alloy ?

2. Reactions of metals with metals with water, acid and air

Go to Internet site link
Go to N-m05-19 and print out, carry out the experiments as explained.

3. Heating Magnesium
This practical is available as a .pdf download

Magnesium is a metal which burns with a bright white flame.
 

Measure the mass of the crucible and lid and magnesium.

Mass before heating, m₁ = ..... g

Heat with a Bunsen burner with air holes about half open.
About once a minute, lift the lid of the crucible slightly and observe the magnesium.
Lift the lid just enough to see inside the crucible. This allows you to see what is happening and also allows a little air to enter the crucible.

Measure the mass of the crucible and lid and contents again.

Mass after heating, m₂ = ...... g

Observations
What do you see inside the crucible?
This is this substance?
What is its chemical formula?

Conclusion
Explain the difference between m1 and m2.

4. Reactions of metals with alkalis. (example: sodium hydroxide)
This practical is available as a .pdf download.

1. Into a test tube put a small amount of aluminium powder.
2. Add carefully 5 cm³ of dilute sodium hydroxide.
3. Record your observations, test carefully for hydrogen.
4. Repeat the experiment for zinc, copper and iron.

Results:

Questions:

1. Which metals react with sodium hydroxide?
2. What evidence is there of a reaction?
3. Try and find out the name of the products produced in this reaction and hence write word and symbol equations for the reactions.

5. What causes iron to rust?
This practical is available as a .pdf download

Introduction: The rusting of iron costs millions of pounds a year. Rust forms on the surface of the iron. Rust is porous, soft and crumbly. It flakes off and as more and more rust forms the iron is eventually eaten away.

Set up the following equipment:

Complete the table below:

Questions:

1. What is the purpose of the calcium chloride?
2. What does boiling the water do?
3. Write a brief conclusion to your experiment.
4. What do you think would have happened if you had used pure oxygen instead of air? Explain.

6. Testing substances for acidity and alkalinity
This practical is available as a .pdf download

Equipment:

• Various solutions of different substances. (Common acids, alkalis and substances found in the home)
• Universal indicator and the pH scale.
• Pipettes
• Rack of test tubes.

Method.

1. Into a test tube put 2cm³ of a solution.
2. Add two drops of universal indicator.
3. Using the pH scale identify the pH of the solution using the colour.
4. Record your results and hence identify the type of substance the solution is.

Example: Strong acid, weak alkali etc.

Results:

1. From your results what type of substances found in the home are; A. Acids?  B. Alkalis?

2. Found out some names of the acids and alkalis that are found in these substances.