Global Warming Flashcards Preview

Physical Science > Global Warming > Flashcards

Flashcards in Global Warming Deck (49)
Loading flashcards...
1

what gasses does the Earth’s atmosphere consist of?

20% oxygen
79% nitrogen
Small amounts of carbon dioxide, argon and water.

2

Inert?

Does not react

3

Combustion?

Burning of substance in oxygen.

4

How do scientists make ammonia gas?

From nitrogen in the air

5

What does scientists use ammonia gas for?

Fertilizers
Cleaning products
Explosives

6

Why does nitrogen need to dilute the air?

Breathing in pure oxygen can be dangerous to our health
Limits harmful effect of combustion.

7

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.

8

Argon?

Inert
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.

9

Properties of oxygen?

Colorless
Odorless
Tasteless
Slightly denser than air

10

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.

11

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.

12

What do we call products of reactions with oxygen?

Oxides

13

How is rust formed?

When iron reacts with oxygen. Reaction needs water to get going. Iron oxide.

14

What is the word equation for rust oxide?

Iron + oxygen + water -> iron oxide

15

Example of poisonous gas?

Carbon monoxide

16

How is carbon monoxide formed?

Carbon burns in too little oxygen.

17

What happens when carbon burns with lots of oxygen?

Carbon dioxide forms.

18

Fossil fuels?

Natural fuels formed by the remains of plants and animals that died millions of years ago.

19

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.

20

What is combustion?

Process in which a substance is chemically combined with oxygen to release energy in the form of heat and light. (Burning)

21

What is the word equation for carbon dioxide given off?

Carbon + oxygen -> carbon dioxide + heat + light

22

Examples of fossil fuels?

Charcoal, petrol, natural gas

23

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.

24

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.

25

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.

26

Ozone?

Gas made of O3 molecules.

27

Ultraviolet radiation?

Rays emitted by sun, can cause damage to humans.

28

Ozone layer?

Protective layer around the earth.

29

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.

30

How does striking lightning affect the ozone?

Produce certain chemicals to react with other in air to form ozone. Closer to Earth, do not contribute to ozone layer.