TOPIC 4 LAB ACTIVITY 1

JUAN CARLOS MARTÍNEZ AGUILERA

• Purpose and Procedure• Experiment 5• Experiment 6• Experiment 1

To avoid the danger in the laboratory, you always mustn’t smell a chemical reaction directly. Because the product can be for example: Ammonia. This smell is very dangerous for the human because is very irritant and after if you smell the ammonia you will have some ache or irritation in your nose. And remember that you mustn’t touch any substance. If you have any problem, you have to advise the teacher.

• To observe different type of chemical reactions.• To identify the type of various chemical reactions.• To predict the products of each.• To write and balance chemical reactions.

• 1. Label test tubes through.• 2. Follow the instructions for the reaction.• 3. Write formulas for reactants in your table.• 4. Predict the products by writing the full chemical equation for the

reaction.• 5. Balance the equation. Classify the reaction.• 6.Record observations about all details of the reaction.• 7. Keep the test tubes containing reactions in a rack.• 8.Record any additional observations from changes that occurred

over the lab period.• 9. When finished, clean the equipment you used and put it away.

EXPERIMENT 5

• Place 20 drops of H2O2 into a test tube. Add small amount of MnO2.

Material

PRODUCT

EXPERIMENT 6

• Dissolve in water a small quantity of FeCl3 and 5 or 6 drops of NaOH (aq).

Material

PRODUCT

EXPERIMENT 1

• In one test tube, mix a few pieces of solid zinc metal with two dopper-fulls of copper (II) nitrate solution. Look closely at the Zn in the tube, and then note the color of the solution.

Material

Questions

• 1. In experiment 6, what colour have the product of the reaction?

• 2. What do we have to do when we are in the laboratory?

• 3. If you smell a liquid in the laboratory and you feel a ache in your nose, what do you have to do?

• 4. In what of this experiments, do we get a black liquid?

• 5. The zinc metal that we used, what it was the state of this material?

Answers

• 1. The colour of the product is yellow-brown. • 2. We have to respect the standards that has

the laboratory.• 3. You have to advise the teacher and says

him what happened.• 4. In experiment 5.• 5. The zinc was in solid state.