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Properties of Gases Essay Sample

Properties of Gases Pages
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Hydrogen

Step B: Describe the zinc and acid reaction.
As placing a small piece of Zn(mossy zinc) metal into the test tube containing the diluted HCI(Hydrochloric Acid) solution, gas bubbles rose from the solution slowly at the beginning and vigorously in process of time. As this reaction continued for a long time, transparent solution turned into white opaque color and black precipitates were formed and floated.

Step G: Record your observations with the flame and the hydrogen gas. When gently squeezing a small portion of the hydrogen gas into the flame, the flame showed small flash with a pop.

Oxygen

Step B: Describe the hydrogen peroxide and manganese reaction. As adding hydrogen peroxide to the test tube containing a few pieces of manganese metal, gas bubbles rose from the solution slowly at first and vigorously over time. This reaction continued for a long time and solution turned into brown opaque color.

Step E: Record your observations with the glowing wooden toothpick and the oxygen-filled pipet. The flame of the glowing wooden toothpick grew bigger instantaneously, as it is placed into the oxygen filled pipet. Also water vapor was generated inside of the pipet.

Hydrogen and Oxygen Mixture

Step D: Record your observations with the flame and the gases in the pipet. When the flame was placed into the pipet containing hydrogen and oxygen mixture, the flame showed small flash with a pop.

Carbon Dioxide

Part 1
Step E: Describe what is happening to the limewater.
The limewater turned into white opaque color, and gas bubbles and white precipitate was formed, as placed the open end of the gas delivery tube(reaction between sodium bicarbonate and white vinegar) into the limewater.

Part 2
Step C: Observe and record the result with the bromthymol blue. The bromthymol blue turned into transparent yellow color.

Step F: Record your observation of a lit toothpick inserted into the gas generation test tube.
As a lit toothpick inserted into the gas generation test tube, the flame blew out.

Part 3
Step F: Observe and record the reaction results with the limewater. The lime water turned into white opaque color, and gas bubbles and white precipitate was formed, as placed the open end of the gas delivery tube(reaction between Alka Seltzer tablet + water) into the limewater.

Part 4
Step C: Record your observations of your breath with the limewater. As I blow gently into the limewater with a straw, the limewater turned into opaque white color.

Conclusion:
The purpose of this experiment is to investigate some physical and chemical properties of gases and to use these properties to identify these gases when they are encountered.

I could learn how to identity Hydrogen, Oxygen, Carbon Dioxide, and hydrogen and oxygen mixture when they are present through this experiment. Before conducting this experiment, I should know the combustion chemical reaction first to predict right results. The most interesting thing was the experiment for gases of hydrogen and oxygen mixture. Through the reaction between hydrogen and oxygen, H2O is produced. H2O is water as we know. So I just expected that flame would blow out due to the water vapor. But it was wrong. The flame grew bigger with a pop and a flash.

To reduce error for this experiment, it was crucial to collect right amounts of gases from the reaction and handle it quickly for the next step due to properties of gases.

Questions:

A. Why do we fill the gas generator test tubes almost to the top with chemicals?

Because we need to eliminate or reduce contamination of air for the gas to be collected, we fill the gas generator test tubes almost to the top with chemicals.

B. Write a balanced equation for the reaction between O2 and H2.

2H2 + O2 2H2O

C. What does the result you observed with the bromthymol blue in Part 2 with carbon dioxide, Step C indicate? The bromthymol blue turned golden yellow. So I could deduce that the product between sodium bicarbonate and vinegar is acidic.

D. What does the result you observed and recorded in Part 3, Step F mean?

The lime water turned into white opaque color, and gas bubbles and white precipitate was formed, as placed the open end of the gas delivery tube(reaction between Alka Seltzer tablet + water) into the limewater. ALKA SELTZER is consisted of citric acid, naHCO3 and aspirin. Both citric acid and aspirin are dissociated in water to produce hydrogen ion. Through this reaction, CO2 is produced. The balanced chemical equation is “Ca(OH)2(aq)) + CO2(g) → CaCO3(s)+ H2O(l)”. When limewater (Ca(OH)2) exposed to CO2, Calcium carbonate (CaCO3) is formed as a precipitate.

E. What does the result you observed and recorded in Part 4, Step C mean? As I blow gently into the limewater with a straw, the limewater turned into opaque white color. Our breathing includes CO2 gas, so this means that I could get result as same above question D. when limewater (Ca(OH)2) exposed to CO2, Calcium carbonate (CaCO3) is formed as a precipitate.

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