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chemistry project

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aj sandoval

on 14 April 2010

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Transcript of chemistry project

Chemistry project By: Aj Sandoval
Beau willhight Hahaha its a blimp There are three kinds of airships that have been manufactured: blimps, dirigibles, and hot air balloons.

1. What is the mechanism of flight for each one? That is, how does each fly?

A blimp uses helium which is lighter than air to thus lifting it up. As the blimp rises, th pressure outside decreases and the helium expands.

A hot air balloon uses hot air to lift it up. Cold air iis heavier then hot air because hot air has less mass

Dirigibles gets off the grounf by filling its main chamber with another substance that is lighter than air.

2.How are these airships similar? How are they different?
This how they are similar
All of theses airships are almost the same in the way they use gas to create to get off the ground .
This how the are different
Blimps can be steered, where as blimps can only go where ever the wind blows them.

3.What are the relative advantages of one over the other?
Dirigibles and blimps have more of an advantage beacause they can control where they go where hot air balloons can only go where the breeze take them .

4. What are the limitations of each?
The limitations for hot air balloons is that they cannot be as loaded on hot days then cool ones.
Blimps and dirigibles are huge in size so they cannot turn all that well

5. Give historical examples of each and be sure to include at least one photo for each one.

Its a hot air balloon 1. 2. The German zeppelin Hindenburg was filled with hydrogen gas. Not surprisingly, the airship was destroyed in a violent fire near Lakehurst, New Jersey on May 6, 1937.

1. Write the balanced chemical equation for the combustion of hydrogen.
2 H2 + 1 O2 = 2 H2O

2. We know that chemical reactions are often exothermic or endothermic. What do these words mean in terms of chemical reactions? What are observable chemical indicators of each? Is the combustion of hydrogen exothermic or endothermic?
When a chemical reaction is exothermic it means that heat is released in the reaction.
When the chemical reaction is endothermic it means that heat was absorbed in reaction.

3. Modern airships are filled with helium.

1. Why are modern airships filled with helium?
Beacause helium is not flammable

2. Why wasn't the Hindenburg filled with helium instead of hydrogen?
Its original plan was to use helium. but at the time the U.S had a militry embargo on it 4. Though more potentially dangerous, a given volume of hydrogen gas will lift more weight than an equal volume of helium because hydrogen is less dense than helium.
5. The Hindenburg was filled with flammable hydrogen but recent research suggests that hydrogen was not the primary material involved in its tragic demise.

1. How did a paint made from powdered aluminum contribute to the disaster?
The kind of paint that coated the Hindenburg had flecks of aluminum, which is an ingredient for rocket fuel. The paint was set a blaze from an electric discharge, then hydrogen ignited.

2. How is powdered aluminum used on the current United States Space Shuttle?
It is used in rocket fuel
3. Write the balanced chemical equation for the reaction aluminum underwent in the Hindenburg disaster. Also indicate if this reaction is exothermic or endothermic.
2 Al + 1 O2= 2 AlO
4. Use the octet rule to explain why powdered aluminum can behave as it is thought to have done in the Hindenburg disaster.
Powdered aluminum acted as it did to The Hindenburg because, it does not a full octet, thus making it very unstable.
5. Do you think an aluminum can would behave in the same manner as powdered aluminum? Explain your answer in detail.

6. Describe the experiments carried out by Addison Bain. Then, explain how his results and other evidence led to the conclusion that the skin of the Hindenburg was the major cause of fire that destroyed the airship.

6. Hot air balloons are filled with air instead of helium.

1. Use the ideal gas law to explain why a hot air balloon rises.
When you heat up air of the hot air balloon, you increase the absolute temperature, which increases the pressure of the balloon. thus making it rise
7. French chemist, Joseph Gay-Lussac is most famous for his description of the gas law, Gay-Lussac's Law
1. What is the formula for Gay-Lussac's gas law?

2. Explain Gay-Lussac's law using words to describe the relationship between the variables. What are the assumed constants in Gay-Lussac's law?
P is the pressure of the gas.
T is the temperature of the gas
k is a constant.

3. How did Gay-Lussac use balloons to study chemistry in the early 1800s?
He increased the energy of the gas in the balloon as the particles collided more, pressure increased inthe balloon.
4. What did he learn from investigations he carried out using a hot air balloon?
if you increse the kinetic energy of a gas, you then increase the pressure of the gas.

Go through this NOVA site and then summarize the key points learned.

1. Helium has less density than air.
2. Hot air balloon's total mass of air will decrease but its volume will stay the same 9 An airplane typically cruises at an altitude of 30,000 - 40,000 feet

1. Hypothesize what problems might be encountered in a suddenly depressurized airplane cabin at 30,000 feet. Be sure to use what you have learned about the gas laws in answering this question.
If you depressurize a cabin suddenly at 30,000 feet, the passengers would pass out

2. here are many myths regarding sudden depressurization. What are some of the myths?
If you shoot a gun in an airplane the cabin will instantly bedepressurized causing everyones head to explode haha

3.What would actually happen if a window or emergency door came off of a plane cruising at 30,000 feet? Why? Be sure to use what you have learned about the gas laws in answering.

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