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21 Cards in this Set
- Front
- Back
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What is the atmosphere made up as
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21% oxygen 78% nitrogen 1% other
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What is the atmosphere made up of
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Nitrogen
Oxygen Carbon dioxide Water vapor Other stuff |
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Air is a=
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Mixture of gases
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What is the other made up as?
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Argon,water vapor and Carbon dioxide
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What are the traces in the atmosphere
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Helium, neon ,methane ,nitrous oxygen
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To measure the %of oxygen in air using a gas syringe
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100cm3 of air is passed over the heated cooper turning from one syringe to another
The cooper reacts with the oxygen in the air to form cooper oxide Cooper+oxygen=cooper oxide(turned black) 2Cu+O2=2Cuo |
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To show that there is carbon dioxide
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Suck air through limewater
Air turned limewater a milky colour CO2 is present in air |
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Water vapor in air
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Crush ice into test tube
Water vapor from air condensed on outside of test tube Moisture turned white Anhydrous copper sulfate blue Water vapor is present in air |
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The preparation of oxygen gas
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Hydrogen peroxide slowly decomposes to give off oxygen gas and water
The reaction needs to be faster!It needs a catalyst Manganese dioxide |
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What is a catalyst
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A catalyst is a substance that speeds up a reaction without being used up in the reaction
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What are some uses of oxygen
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Welding and medicine(oxygen masks)
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To test for oxygen
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Light a match inside a test tube
Oxygen rekindles(delights) a glowing this is the characteristics test for oxygen |
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To show that approximately one fifth of the air is oxygen (1)
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The water rises approximately one fifth of the height of the graduated cyclinder to replace the oxygen used up by the burning candle
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To show that one fifth of the air is oxygen(2)
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Volume of the air before heating=100cm3
Volume of air after hearing cooper=79cm3 Volume of oxygen present in 100cm3=21cm3 |
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Calcium carbonate + hydrochloric acid = calcium chloride + water + carbon dioxide
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CaCO3+2HCL=CaCl2+H2O+Co2
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Preparation of carbon dioxide (test 1)
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Slowly realize the hydrochloric acid into the flask underneath
Carbon dioxide is collected in glass jar Pour a small volume of limewater into the jar+ shake-the limewater will turn milky showing the gas is carbon dioxide |
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Preparation of carbon dioxide (test 2)
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Slowly realize the hydrochloric acid into the flask underneath
Carbon dioxide is collected in glass jar Add water to a fresh jar of carbon dioxide +test with blue litmus:it turned red demonstrating that it is an acid |
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Limewater +carbon dioxide =calcium carbonate +water
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Ca(OH)2+CO2=CaCO3+H2O
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To show that carbon dioxide doesn't support combustion
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Light a wooden splint and insert it into a glass jar of carbon dioxide
Result:the splint will extinguish showing that carbon dioxide does not support combustion |
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Carbon dioxide has a greater density than air
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Pour the gas over the candle
Because carbon dioxide is densire than air the gas sinks and extinguishes the candle |
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Some uses of carbon dioxide
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Fizzy drinks,fire extinguisher + special effects on stage
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