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Chemistry #yeet :) > 2.1 > Flashcards

2.1 Flashcards

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1
Q

what is relative isotopic mass?

A

The mass of an isotope compared to 1/12th the mass of carbon 12.

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2
Q

What is relative atomic mass ?

A

The weighted average mass of an isotope compared to 1/12th the mass of carbon 12.

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3
Q

What is Mr?

A

relative mass- the rfm of a formula.

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4
Q

No of particles =?

A

No of moles x avogandros

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5
Q

Mass=?

A

Moles x Mr

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6
Q

Mr=?

A

Mass / moles

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7
Q

What does weighed mean ?

A

Average based on abundance of what you’re measuring

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8
Q

What is empirical formula?

A

Simplest whole number ratio of atoms in a compound

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9
Q

Concentration=?

A

Moles / volume

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10
Q

Volume =?

A

Moles / concentration

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11
Q

What is relative Atomic mass ?

A

Weighted average mass of an atom compared to 1/12th the mass of carbon 12.

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12
Q

Nitrate ?

A

NO3-

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13
Q

Carbonate?

A

CO32-

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14
Q

Sulphate ?

A

SO42-

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15
Q

Hydroxide ?

A

OH-

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16
Q

Ammonium?

A

NH4+

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17
Q

Zinc ion?

A

Zn 2+

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18
Q

Silver ion?

A

Ag+

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19
Q

What’s pressure measured in in pv=nrt?

A

Pascals

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20
Q

What’s volume measured in in pv=nrt?

A

Metres cubed

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21
Q

0 C= ?K

A

273

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22
Q

What’s room temp?

A

25 C

298K

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23
Q

What units of gas does n=v/24 use ?

A

Dm 3

24
Q

What is oxidation in terms of electrons?

A

LOSS

25
Q

What is reduction in terms of electrons ?

A

GAIN

26
Q

What is a reducing agent ?

A

Substance (reactant) that is oxidised

27
Q

What is an oxidising agent ?

A

Substance (reactant) that is reduced

28
Q

What are the rules of assigning oxidation states ?

A 
123 
fluorine =-1
Hydrogen =1 except metal hydrides 
Oxygen = -2 except f20 and peroxides 
Chlorine =-1 except w oxygen
29
Q

Chlorate ?

A

ClO (x) -

30
Q

What is not included in ionic equations ?

A

Spectator ions

Solid ions

31
Q

YOU CANT… (in ionic equations)

A

CANCEL OUT ATOMS

32
Q

Atom economy=?

A

Mr of desired product/ Mr of all products

x100

33
Q

What is an alkali ?

A

A type of base that is able to dissolve in water to form aqueous hydroxide ions, OH-.

34
Q

What are amphoteric substances ?

A

When substances can behave as acids and bases, e.g. Amino acid molecule

35
Q

What is an example of volumetric analysis ?

A

Titration

36
Q

What happens during volumetric analysis ?

A

You measure the volume of 1 solution that reacts w the volume of a different solution

37
Q

what is an acid?

A

something that releases H+ ions in an aqueous solution.

38
Q

what is a strong acid?

A

an acid that fully dissociates in solution.

39
Q

what is a weak acid?

A

an acid that partially dissociates in solution.

40
Q

Percent uncertainty ?

A

Equipment uncertainty x number of uses
^ divided by measured value
x100

41
Q

what kind of reaction has 100 percent atom economy?

A

addition reaction

42
Q

why would the result of a titration of vinegar produce wrong results and how would the experimental value change?

A

assume vinegar doesn’t contain any other acids-concentration of real vinegar of ethanoic acid would be less than experimental value.

43
Q

WHAT ARE THE UNITS FOR PV=NRT

A

p=pascals
n=moles
t=kelvins
v=METRES CUBED

44
Q

why is anything described as a salt?

A

because the H+ is replaced by ….

THIS IS V IMPORTANT

45
Q

what should you include in a definition of an isotope?

A

ATOMS of an element

w different neutrons

46
Q

what is a mole of a substance?

A

the amount of a substance that contains as many particles as there are carbon atoms in 12g of carbon 12.

47
Q

instead of weighing scale, say…

A

balance
check the balance
the bank account balance

48
Q

WHEN THEY ASK YOU WHAT A SALT IS OR WHY SOMETHING IS A SALT SAY

A

THE H+ ION OF AN ACID HAS BEEN REPLACED BY A METAL ION.

49
Q

WHEN THEY ASK YOU WHY SOMETHING IS A BASE (IN TERMS OF PROTONS) SAY

A

IT HAS ACCEPTED A PROTON. IF ITS ONLY ACCEPTED 1 PROTON DON’T SAY ITS ACCEPTED PROTONS.

50
Q

HOW CAN YOU TELL A NEUTRALISATION REACTION HAS TAKEN PLACE

A

BUBBLES

WHITE SOLID DISSAPEARS

51
Q

WHEN DESCRIBING AN ACID MAKE SURE YOU ALWAYS SAY

A

PROTON DONOR

52
Q

WHAT ARE SOME INDUSTRIAL USES OF AMMONIA (why was this a question who knows)

A

FERTILISER

MANUFACTURING: EXPLOSIVES, DYES, HN03

53
Q

WHY DO ISOTOPES REACT THE SAME

A

they have the same number of protons and electrons, AND ELECTRONS IN THEIR OUTER SHELL.

54
Q

WHEN PLOTTING A GRAPH

A

ALWAYS DRAW THE LINE OF BEST FIT

55
Q

HOW MANY GRAMS IN A TONNE

A

1,000,000 (1 MILLION)

56
Q

when describing why something’s a catalyst always mention.

A

that it’s regenerated.

57
Q

when an ester forms what ‘type of reaction’ is it apparently?

A

esterification/condensation. you can’t say dehydration or elimination apparently.

Chemistry #yeet :) (13 decks)

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