Term
|
Definition
Nitrogen 78%
Oxygen 21%
Argon 1%
Carbon Dioxide 0.04%
Water Vapour varies |
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Term
| Burning Phosphorus in a bell jar |
|
Definition
The phosphorus burns and reacts withe
the oxygen. As the oxygen is used up
it is replaced by water, which rises
1/5 up the bell jar |
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Term
| Preparing oxygen in the laboratory |
|
Definition
Oxygen car be prepared by the catalytic decomposition of hydrogen peroxideHydrogen peroxide(2H2O2) decomposes into water and oxuygen gas
the decomposition only occurs very slowly but can be speeded up by using a catalyst
(Manganese Oxide) |
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Term
|
Definition
| Oxygen will relight a glowing splint |
|
|
Term
|
Definition
Oxygen is slightly soluble in water, which enables aquatic life to live
Oxygen is very reactive, but in air is diluted by very unreactive Nitrogen Gas |
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Term
|
Definition
It is used as a breathing aid
When burned with Hydrogen gas is used as rocket fuel
When burned with acetylene(ethyne) it produces and hot flame(oxy-acetylene flame)
It is used to make steel from cast iron |
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Term
| Burning substances in Oxygen |
|
Definition
Substances burn much better in oxygen than in air
Metal + Oxygen----->Metal Oxide
None-metal + oxygen----->Non-metal oxide |
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Term
| Testing for Acid Or alkaline |
|
Definition
Ading universal indicator will turn:
Strong acid Red-Orange
Weak acid Orange-Green
Weak Alkali Green-Blue
Strong Alkali Blue-Purple |
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|
Term
| Magnesium when burned in Oxygen |
|
Definition
| Burns with a brilliant white flame, leaving a white ash(Magnesium Oxide) MgO will turn Universal indicator blue upon shaking |
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|
Term
| Sulfur when burned in Oxygen |
|
Definition
| Burns with a blue flame producing a colourless gas(Sulfur Dioxide)Turns Universal indicator red |
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|
Term
| Carbon when burned in Oxygen |
|
Definition
| Burns with a red glow and sparks producing a colourless gas (Carbon dioxide) which turns Universal indicator Orange |
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|
Term
| Sodium when burned in Oxygen |
|
Definition
| Burns with a golden yellow flame, producing a white solid (Sodium oxide) Turns Universal indicator Violet |
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Term
|
Definition
None-metal oxides are acidic
Metal oxides are basic (i.e. dissolve in water to form alkaline solutions) |
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Term
|
Definition
| Rain water is naturally slighlty acidic because of dissolved CO2. Non-metal oxides such as Sulfur dioxide make rain water more acidic. |
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Term
|
Definition
| Petrol engines in cars produce Oxides of nitrogen, such as NO or NO2. Because the spark makes nitrogen and oxygen react together |
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Term
|
Definition
Acid rain attacks metals and limestone
Acid rain has a devastating effect on tree growth
Acid rain alters the PH of lakes, threatening aquatic life |
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Term
| Preperation of Carbon dioxide |
|
Definition
CO2 is prepared by reacting an acid with a carbonate.
CO2 can be collected by downward delivery or displacement of water because it is more dense than air |
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Term
| Reaction of limewater with CO2 |
|
Definition
| Ca(OH)2 + CO2----->CaCO3 + H2O |
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