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Chemistry Y9 > Reactions > Flashcards

Reactions Flashcards

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1
Q

How much does each gas make up of air

A

Oxygen =21%
Nitrogen =78%
Argon=0.9%
CO2=0.037%

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2
Q

Describe oxygen

A

Colourless
odourless gas
Slightly soluble

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3
Q

What is oxygen used for

A

Welding torches
Rocket fuel
Reaching apparatuse

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4
Q

Respiration equation

A

Sugar+oxygen ✔️ Carbon dioxide +water(+energy)

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5
Q

Rustling equation

A

Iron+oxygen+water ✔️ Hydrated iron oxide

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6
Q

Burning fuel equation

A

Fuel+oxygen ✔️ carbon dioxide+water+energy

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7
Q

A fuel reacts with oxygen to release

A

Energy

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8
Q

Chemical test for water

A

Presence of water turns anhydrous copper from white to blue

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9
Q

Why can we collect oxygen over water

A

As it is only slightly soluble in water

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10
Q

How do we prepare a sample of oxygen

A

By the decomposition of hydrogen peroxide using manganese’s dioxide as a catalyst

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11
Q

What happens during the test for oxygen

A

Bubbles of gas can be seen and the test tube empties

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12
Q

Concluded on the test for oxygen

A

Oxygen is prepared by “the decomposition of hydrogen peroxide
To speed this reaction up we used manganese dioxide. Manganese dioxide is a catalyst.

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13
Q

What is the ets for oxygen

A

Relight a glowing splint

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14
Q

Draw the apparatus for the preparation of oxygen

A

Side arm test tube is held by a clamp .I contains hydrogen peroxide and manganese dioxide catalyst . Delivery tube connects to test tube over a water trough

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15
Q

Equation for the preps of oxygen

A

Manganese dioxide
Hydrogen peroxide ✔️ water+oxygen

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16
Q

Catalyst

A

A catalyst is a chemical that speeds up an a reaction without being used up itself

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17
Q

Iron as. A catalyst

A

Making ammonia from nitrogen and hydrogen

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18
Q

Platinum as a catalyst

A

Making nitric acids from ammonia

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19
Q

Vanadium (V)oxide as a catalyst

A

Making sulphuric acid

20
Q

Describe hydrogen

A

Colourless odourless gas

21
Q

Uses of hydrogen

A

Making margarine
Clean fuel
Rocket fuel

22
Q

Hydrogen is collected in a upward delivery tube because it is

A

Less dense than air

23
Q

How is hydrogen produced

A

By reacting magnesium with Hydrochloric acid.

24
Q

Draw the apparatus for the hydrogen

A

Retort stand has clamped on a side arm test tube with a bung on top. In side there is magnesium and hydrochloric acid. There is then an upward delivery tube with test tube ontop

25
Q

What are the results of the test for hydrogen

A

Heat is given out
Bubble of gas produce
Lit splint will give a squeaky pop

26
Q

What did we conclude about hydrogen

A

Hydrogen can be prepared by an acid with a metal

27
Q

Word equation for preparation of hydrogen

A

“Magnesium + Hydrochloric Acid → Magnesium Chloride + Hydrogen”

28
Q

Science behind hindenburg

A

Hydrogen reacted with oxygen because of spark due to static e,electricity from journey

29
Q

Describe carbon dioxide

A

Colourless odourless gas

30
Q

Uses of carbon dioxide

A

Fizzy drinks
Fire extinguisher
Dry ice

31
Q

Carbon dioxide can be prepared easily by

A

Reacting a metal carbonate with acid

32
Q

Word equation for preparation of carbon dioxide

A

“Calcium carbonate + Hydrochloric acid → Calcium chloride + Water + Carbon Dioxide”

Excerpt From
Year 9 Chemistry
This material may be protected by copyright.

33
Q

Results for carbon dioxide

A

Bubbles of gas
Metal carbonate disappears to give a clear solution
Limewater water turns milky

34
Q

Test for carbon dioxide

A

Sun carbon dioxide is bubbled through limewater it turns it milky

35
Q

Draw the apparatus for testing for.p carbon dioxide

A

Side arm test tube with bung contains acid and marble chips. Downward delivery tube goes into test tube containing lime water

36
Q

An endothermic reaction

A

Takes in heat from the surrounding atmosphere and is then cooler than
N the at,osphere

37
Q

Exothermic

A

Gives out heat so the reaction is warmer than the atmosphere

38
Q

How do you test if a reaction exothermic or endothermic

A

Pour chemicals in polystyrene cup measure temperature before and after reaction

39
Q

Thermal decomposition

A

Heat something up and it breaks down

40
Q

Oxidation

A

“An oxidation reaction occurs when a chemical reacts with oxygen. ”

Excerpt From
Year 9 Chemistry
This material may be protected by copyright.

41
Q

Reduction

A

“Reduction is the opposite of oxidation and occurs when a substance loses oxygen”

Excerpt From
Year 9 Chemistry
This material may be protected by copyright.

42
Q

When a reduction reaction can not occur by itself we. Use a

A

Reducing agent

43
Q

Reducing agent

A

“A substance which reduces another substance. ”

Excerpt From
Year 9 Chemistry
This material may be protected by copyright.

44
Q

Redox reaction

A

“reaction in which REDUCTION AND OXIDATION takes place together.”

Excerpt From
Year 9 Chemistry
This material may be protected by copyright.

45
Q

Thermite reaction

A

Highly exothermic

“iron(III) oxide + aluminium → aluminium oxide + iron”

Excerpt From
Year 9 Chemistry
This material may be protected by copyright.

46
Q

If copper oxide becomes copper

A

It has been reduced

47
Q

If carbon becomes carbon dioxide it has been

A

Oxidised

Chemistry Y9 (5 decks)

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