Flashcards in Global Warming Deck (49)
what gasses does the Earth’s atmosphere consist of?
Small amounts of carbon dioxide, argon and water.
Does not react
Burning of substance in oxygen.
How do scientists make ammonia gas?
From nitrogen in the air
What does scientists use ammonia gas for?
Why does nitrogen need to dilute the air?
Breathing in pure oxygen can be dangerous to our health
Limits harmful effect of combustion.
How do aquatic animals breathe?
They use oxygen dissolved in water. The oxygen in the air dissolves when come in contact with water. As long as the water surface is exposed to air, the water will contain oxygen.
If light bulb filled with air, thin metal thread inside will react with the oxygen. Will cause filament to burn away quickly. Since argon does not react with the filament, it is used to fill light bulbs.
Properties of oxygen?
Slightly denser than air
Preparation of oxygen?
Can be made by adding a catalyst, manganese oxide to hydrogen peroxide. In the reaction, hydrogen peroxide is broken apart to form oxygen gas and water.
How do you test for a gas?
1. Light a match or splint and quickly blow it out. Make sure it continues to glow.
2. Place splint at mouth of jar.
3. Glowing splint will re-ignite when gas is oxygen.
What do we call products of reactions with oxygen?
How is rust formed?
When iron reacts with oxygen. Reaction needs water to get going. Iron oxide.
What is the word equation for rust oxide?
Iron + oxygen + water -> iron oxide
Example of poisonous gas?
How is carbon monoxide formed?
Carbon burns in too little oxygen.
What happens when carbon burns with lots of oxygen?
Carbon dioxide forms.
Natural fuels formed by the remains of plants and animals that died millions of years ago.
What is the role of oxygen in combustion?
When something burns in oxygen, there is more light and heat produced than was needed to start the reaction.
What is combustion?
Process in which a substance is chemically combined with oxygen to release energy in the form of heat and light. (Burning)
What is the word equation for carbon dioxide given off?
Carbon + oxygen -> carbon dioxide + heat + light
Examples of fossil fuels?
Charcoal, petrol, natural gas
What is photosynthesis?
Use water light and carbon dioxide to create food and oxygen. They produce glucose, which is a simple sugar stored in plant. At night, plant combines glucose with with oxygen to produce energy.
How can you use oxygen in life, health and medical uses?
Hospitals: O2 in tanks for people problems breathing.
Mountain climbers and deep sea divers: tanks of oxygen for when natural supply not enough or present at all.
What are the uses of oxygen for industrial purposes?
During production of steel, oxygen gas blown through molten steel to purify it.
In metal cutting and welding, oxygen mixed with another chemical to create fuel:
At high pressure, mixture burns strongly to produce flame strong enough to cut metals by melting them.
Gas made of O3 molecules.
Rays emitted by sun, can cause damage to humans.
Protective layer around the earth.
How is the ozone formed?
Formed in upper atmosphere of Earth ultraviolet radiation strikes oxygen molecules. UV light is form of energy that can split the O2 molecules in 2 to create individual oxygen atoms. One atom, combines with another O2 molecule, making ozone molecule. Continuous cycle.