Assignment- EXPERIMENT: Identification of Gases

Hands-On Labs, Inc. Version 42-0189-00-02

Review the safety materials and wear goggles when working with chemicals. Read the entire exercise before you begin. Take time to organize the materials you will need and set aside a safe work space in which to complete the exercise.

Experiment Summary:

You will learn the properties of gases. You will investigate a series of chemical reactions that generate different gases with unique properties.

You will generate a series of gases and explore the properties of gases through flame tests and chemical reactions. You will also use your results to identify an "unknown" gas.

Exercise 1: Gas and Flame Tests

Questions:

A. Write a balanced chemical equation describing the reaction of zinc and hydrochloric acid.

B. What gas was produced by the reaction of zinc and hydrochloric acid? How did this gas behave in the presence of fire?

C. What gas was produced by the decomposition of hydrogen peroxide? What happened when the smoldering toothpick came in contact with the gas?

D. Compare the behavior of the mixture of gases with each solitary gas in the presence of flame.

E. Outline the procedures you would use to determine whether a gas sample was composed of hydrogen or oxygen.

Exercise 2: Gas and Reactions

Questions

A. The chemical equation for the reaction of baking soda (sodium bicarbonate, NaHCO₃) and vinegar (acetic acid, CH₃COOH) may be written as two steps. Fill in the missing information for the chemical equation.

Step 1: ___________ + ___________ → CH₃COONa(aq) + H₂CO₃(l)
Step 2: H₂CO3(l) → H₂O(l) + ___________

B. Write a chemical equation for the reaction of CO₂ and limewater (Ca(OH)₂). Write a physical description of the products formed.

C. When the bromothymol blue (BTB) was exposed to the CO₂ gas, what color was the solution? Did the BTB indicate presence of an acid or base? Explain your answer.

D. Did the reaction between the antacid tablet and the tap water produce hydrogen, oxygen, or carbon dioxide gas? Support your answer with results from your work in both Exercise 1 and Exercise 2.

E. Based on your observation of the reaction that occurred when limewater was exposed to your breath, what gas did you exhale? Support your answer with your observations in Data Table 2.

Attachment:- Exp-Identification-of-Gases.pdf