Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

zChemistry > Extra P2 > Flashcards

Extra P2 Flashcards

1
Q

Why does sodium react like that with water?

A

reaction produces
heat/exothermic (1)
• (sodium) has low melting
point (1)

• (sodium) has low
density/density less than
water (1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What colour flame does potassium produce when it reacts with water?

A

lilac

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What do alkali metals produce when they react with wate?

A

Alkaline solution.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Why is argon used in filament lamps?

A

Because it is inert.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the test for chlorine?

A

(damp blue) litmus (paper)
(1)
• (turns red then) white /
bleaches (1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Does the mass of the catalyst change?

A

No.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What makes a good fuel?

A 
burns easily / produces little ash
/ produces little smoke /
produces high heat energy (per
unit mass) / easy to {store /
transport}
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Is sugar cane infinite?

A

Yes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the uses of bitumen?

A

Used for road surfacing and roofing/flooring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the problem with carbon/soot and carbon monoxide?

A

Causes raspatory issues and carbon monoxide is poisonous.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is a positive of renewable/recyclable

A

Reduces demand for fossil fuels and they do not contain impurities such as sulphur which react with oxygen to form sulphur dioxide which is acid rain.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the percentage of carbon dioxide in the world?

A

Less than 0.5%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What do you not talk about?

A

Ozone layer.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How do greenhouse gases keep the earth warm?

A

Reflects heat back to the earth.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Why would water level rise?

A

volume of gas in bell jar
decreases/water rises to
fill the space (1)
• oxygen is removed from the air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why dont we know the composition of the old atmosphere?

A

Nobody was there and no records also different sources of information.

17
Q

Is nitrogen a greenhouse gas?

A

No.

18
Q

Is water vapour a greenhouse gas?

A

Yes.

19
Q

Is crude oil a compound or mixture of hydrocarbons?

A

Mixture.

20
Q

What would you see if you added a small piece of rubidium to the water?

A

effervescence / bubbles / fizz (1)
• disappears / gets smaller (1)
• explodes / flame / ignites / sparks (1)

21
Q

Why do you wait for it to cool before you take a reading?

A

The gas has expanded when it is hot.

22
Q

Experiment to show charged particles are present in a solution?

A

insert electrodes (into aqueous solution)(1)
• connect to electrical supply /powerpack
/battery/cell (1)
• bulb lights / ammeter shows current / electrolyte
decomposes

23
Q

What is better than a measuring cylinder for measuring gas?

A

syringe or burette.

24
Q

What will happen to seas a result of climate change?

A

more co2 released which will dissolve and lower pH of sea. Temps rise and it causes coral to push out the photosynthetic algae that live in their tissues. These algae provide the colour of coral so coral bleaching will occur.

25
Q

Giant covalent?

A

High melting point, insoluble in water and most do not conduct electricity

26
Q

Are crystals regular or irregular?

A

Regular

27
Q

Simple molecular (covalent)?

A

Low melting, a few are soluble in water and most do not conduct electricity

28
Q

Fullerenes?

A

Molecules are strong low melting points

29
Q

What is breaking bonds?

A

Endo

30
Q

What is making bonds?

A

Exo

31
Q

Bond calc what is neg?

A

Exo

32
Q

Bond calc what is neg?

A

Exo

33
Q

Bond calc what is pos?

A

Endo

34
Q

Left?

A

Breaking

35
Q

Right

A

Making

36
Q

Effect of burning fossil fuels on the atmosphere?

A

adds carbon dioxide/adds water vapour (1)

• removes oxygen (1)

37
Q

Describe what would be seen when a piece of calcium is dropped into a
container of water.

A 
gical description:
• (hydrogen produced as a gas so) there
would be {effervescence/fizzing/
bubbles} (1)
• and (calcium hydroxide produced as a
solid so) the water would go {cloudy/a
white precipitate would form} (1)

zChemistry (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions