Brainscape's Knowledge GenomeTM

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


See full index

Tys Errors > Chem Tys > Flashcards

Chem Tys Flashcards

1
Q

Melting point down grp I vs grp VII

A

I: decr MP
VII: incr MP

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

Reactivity down grp I vs VII

A

I: incr reactivity
VII: decr reactivity

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

Ethene use vs ethyl ethanoate use

A

Ethene: to make polymers for packaging
Ethyl ethanoate: ink solvent

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

Evidence that a org compound group is a homologous series 4

A
  • same general formula
  • same functional group
  • successive members differ by -CH2-
  • gradation in physical properties (if shown)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Products of FULL combustion of a organic compound

A

~ + O2 -> CO2 + H2O

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

Explain why Haber process mixes N2 and H2 in 1:3 ratio

A

Using avogadros law: 1 mol N2 reacts w 3 mol H2, hence 1:3

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

Effect of pressure of FINAL amt of ammonia made in Haber

A

Unreacted gases recycled, final amt same regardless of pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Conc aq solution products

A

The products are of the aq solution cause they are both in high conc

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

Oxygen gas at positive electrode equation ionic

A

4OH- —> O2 + 2H2O + 4e-

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

When adding random reagents and asking for observations

A
  • see if the resulting salts form ppt (insol)
  • see if there’s metal to displace
  • acids? Are there metals?
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When metal added to carboxylic acid OBSERVATIONS

A

Effervescence observed
Rate of reaction slower than inorganic acid

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

Argon is used in…

A

Manufacture of steel!
Iron too ofc

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

Paraffin is used as

A

Aircraft fuel

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

Why isotopes have identical chemical properties

A

Same number of VALENCE electrons

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

Definition Relative Atomic Mass

A

Ratio of the average mass of an atom of an element to 1/12th of the mass of an atom of carbon-12

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

Definition disproportionating reaction

A

The same element is simultaneously oxidised and reduced in the same chemical reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Disadvantage of non biodegradable shit

A

Incr waste sent to landfills (takes up space) or incinerators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Speed of reaction

A

Incr gradient of graph = incr speed of reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Fuel cells (Chem of reaction)

A

Reactants are CONTINUOUSLY SUPPLIED to produce electricity, HYDROGEN usually used as its RENEWABLE AND POLLUTION FREE. however, it’s EXPENSIVE, FLAMMABLE AND LIGHT (^space req to store)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Bacicity of acids def

A

The max number of H+ ions produced by a molecule of an acid

Monobasic = 1H+
Dibasic = 2H+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Element that shows both metallic and non metallic character

A

Hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Element used for galvanising

A

Zinc (galvanise= coat iron or steel w prot layer of zinc)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Properties of transition elements

A
  • form coloured compounds
  • variable oxidation states in their compounds
  • they and their compounds are good catalysts
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Colour of silver IODIDE

A

yellow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Photoystensis equation

A

6CO2 + 6H2O -> C6H12O6 (aq) + 6O2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Respiration equation

A

C6H12O6 (aq) + 6O2 -> 6CO2 + 6H2O

27
Q

How respiration and photosynthesis maintain carbon cycle

A

Amt of C by both is same

28
Q

Process used to manufacture alkenes

A

Catalytic cracking

29
Q

Why are alkane fractions cracked further

A

Less useful longer chain alkanes eg diesel and LO -> shorter chain alkanes eg petrol w higher demand

30
Q

Bromination

A

AQUEOUS bromine used

31
Q

Vegetable oil -> margarine how

A

Add H2 gas to VO, temp of 200C and nickel catalyst (hydrogenation)

32
Q

Calcium added to salt solutions, fizzing

A

V reactive, forms calcium hydroxide + H2 gas

33
Q

More soluble chromatography

A

Higher up
More soluble = Rf closer to 1

34
Q

Mole calc dm3 triangle

A

Dm3
Mol | 24

35
Q

Rate of decomp of metal carbonates

A

More reactive = carbonate more stable = need higher temp to decomp

36
Q

Blast furnace

A
37
Q

When asked about Mr of gases and diffusion

A

HIGHER mr = LOWER ro.d = water level higher/lower

38
Q

Which is giant molecular

A

MOLECULAR not ionic

If it looks like smt u don’t see in covalent DONT pick it

39
Q

Insoluble salt prep

A

You’ll probably need to acidify it first

Just remember: IT DOESNT NEED TO BE CRYSTALLISED

40
Q

You’re gonna need quantitative analysis

A

roger roger

41
Q

In redo eqns assign each reactant to its product carefully to see if it’s reduced or not

A

Eg

~ + H2O2 + H+ —> O2 + H2O

H2O2 is OXIDISED to O2 not reduced to H2O
H2O2 is the only source of O, H+ can gain O

42
Q

Get your highlighter out girl your eyes are not to be trusted

A

Noted 👍

43
Q

In the alkene reaction with the UV light

A

Only ONE H atom is replaced by a C or F at one time

What’s it called btw

44
Q

When something (eg a hydrocarbon) is hydrolysed,

A

it adds WATER to it. H2O. NOT THE CATALYST???

45
Q

Why is there ammonia in QA result?

A

There’s gotta be nitrate somewhere
👈😎👈 NH3/4 y’all

46
Q

Ammonium salt + ____ -> ammonia gas

A

Alkali !!! Like limewater

47
Q

Why are additional things added in some processes

A

Impurity reduces melting point -> less energy required

48
Q

Why is silicon dioxide solid while sulfur dioxide gas

A

SiO2 = covalent bonds

Stronger than

SO2 = intermolecular forces of attraction

49
Q

Flue gas desulfurisation first main product

A

Calcium sulFITE

+ oxygen -> calcium sulfate

50
Q

Molecules present in mixture after bromination of methane

A
  • hydrogen bromide
  • dibromomethane

NO HYDROGEN

51
Q

What excess reactant can be used to make potassium lactate from lactic acid

A
  • potassium hydroxide / carbonate

Remember it’s an ACID. Standard reactions apply

52
Q

When metal occurs naturally as an element

A

Not very reactive (cannot be extracted by electrolysis)

53
Q

Redox reactions: is it redox? 🤨🤷‍♂️

A

If it’s only one reactant it probably isn’t. It might be a disproportioantion reaction!

54
Q

Which statements about cracking of hydrocarbons is correct?
1. Involves breaking down hydrocarbon molecules
2. One of the products is always unsaturated
3. Cracking is essential cause of demand for smaller fractions

A

ALL OF THE ABOVE

55
Q

Given % by mass of each element in X, what other info is needed to determine molecular formula?

A

Mr of the elements and Mr of X

56
Q

Cropper oxide reduced to copper via heating, dry hydrogen gas pumped into the tube until tube is cold. Why?

A

Prevents copper from reacting with oxygen in air

57
Q

What can be used with sublimation

A

Ammonium chloride
Dry ice
Iodine

58
Q

Impurities will

A

Raise bp
Lower mp

59
Q

Diff gases, same moles, volume?

A

Same (abocardos law, 6 x 10^23)

60
Q

Change in mass of cathode and anode when reactive electrode

A

Anode mass decr
Cathode mass incr

No net gain or loss of ions in the solution, no colour change

61
Q

Electroplating

A

Object to be plated is the cathode

Plating metal is the anode

62
Q

Simple cell

A

More reactive metal oxidation (neg electrode)

Less reactive reduced (pos electrode)

Higher diff in reactivity = higher voltage

(If electrolyte is dilute sulfuric acid, H+ ions to H2 gas at lower reactivity)

63
Q

Enthalpy change calculation

A

PRODUCTS - REACTANTS

64
Q

Acidic soil?

A

Add quicklime (CaO) or slaked lime (Ca(OH)2)

Tys Errors (2 decks)

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