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Chemistry > Oxygen / Oxides > Flashcards

Oxygen / Oxides Flashcards

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1
Q

What is the percentage of nitrogen in the air?

A

78%

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2
Q

What is the percentage of argon in the air?

A

About 1%

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3
Q

What is the percentage of oxygen in the air?

A

21%

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4
Q

What is the percentage of Co2 in the air

A

0.04%

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5
Q

USING COPPER TO INVESTIGATE PROPORTION OF O2 IN AIR

Copper + oxygen –> ?

A

Copper (II) oxide

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6
Q

Balance :

Cu + O2 –> CuO

A

2Cu + O2 –> 2CuO

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7
Q

USING COPPER TO INVESTIGATE PROPORTION OF O2 IN AIR
Method :
Heat _________ of copper in a tube & pass _____ over it using two ________. Use the markers on the _________ to work out how much O2 been used up.

A

Excess
Air
Syringes
Syringes

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8
Q

USING IRON TO INVESTIGATE PROPORTION OF O2 IN AIR

Iron + oxygen + water –> ?

A

Iron oxide (rust)

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9
Q

USING IRON TO INVESTIGATE PROPORTION OF O2 IN AIR
Method :
First soak some _____ _____ in ________ acid. Turn the ______ upside down and put into a _______ of water. The _____ will soak up the oxygen. The water should rise/fall to fill the place of the oxygen.

A 
Iron wool
Acetic
Test tube
Beaker
Iron
Rise
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10
Q

USING IRON TO INVESTIGATE PROPORTION OF O2 IN AIR

Work out the percentage of O2 used up by working out the …..

A

Difference between start and end volumes

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11
Q

LAB PREPARATION OF O2

H2O2 –> ? + ?

Then balance

A

H2O + O2

2H2O2 –> 2H2O + O2

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12
Q

LAB PREPARATION OF O2

What is H2O2

A

Hydrogen peroxide

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13
Q

LAB PREPARATION OF O2
What is the name of this type reaction –>
2H2O2 -> 2H2O + O2

A

Decomposition reaction

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14
Q

LAB PREPARATION OF O2

2 collection methods

A

Over water - use delivery tube to bubble gas into upside down measuring cylinder
Gas syringe

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15
Q

What’s the reaction between magnesium and oxygen

A

Magnesium + oxygen –> magnesium oxide

2Mg + O2 –> 2MgO

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16
Q

Magnesium + oxygen
Magnesium burns with a _______ _________ flame in air.
________ powder formed is ___________ ___________ - which is flighty _______ dissolved in water

A

Bright white
White
Magnesium oxide
Alkaline

17
Q

What’s the reaction between carbon and oxygen

A

Carbon + oxygen –> carbon dioxide

C + O2 –> CO2

18
Q

Carbon + oxygen
Carbon will only burn if very __________ heated. It burns with a ________/________ flame and produces _________ __________ gas. Which is slightly ___________ dissolved in water.

A

Strongly
Orangey/yellowy
Carbon dioxide
Acidic

19
Q

What is the reaction between sulfur and oxygen

A

Sulfur + oxygen –> sulfur dioxide

S + O2 –> SO2

20
Q

Sulfur + oxygen
Burns in air / oxygen with a _______ _________ flame and produces ________ __________. This is _________ when dissolved in water.

A

Pale blue
Sulfur dioxide
Acidic

Chemistry (4 decks)

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