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Year 12 Take 1 Chem > Unit one > Flashcards

Unit one Flashcards

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1
Q

relative atomic mass

A

the mean mass of an element compared to the mass of one twelfth of a carbon-12 atom

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2
Q

relative isotopic mass

A

the mean mass of an isotope compared to tge mass of one twelfth of carbon-12

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3
Q

isotopes

A

isotopes have the same number of electrons and protons but a different number of neutrons

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4
Q

spectrometer

A

used to measure the mass of an isotope/element

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5
Q

hydrochloric acid

A

HCl

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6
Q

nitric acid

A

HNO3

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7
Q

sulphuric acid

A

H2SO3

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8
Q

silver chloride

A

AgCl

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9
Q

sodium hydroxide

A

NaOH

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10
Q

calcium carbonate

A

CaCO

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11
Q

ammonium

A

NH4

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12
Q

what is the ionic charge of a magnesium ion

A

+2

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13
Q

what is the ionic charge of a fluoride ion

A

-

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14
Q

what is the ionic charge of an aluminum ion

A

+3

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15
Q

what is the ionic charge of a carbonate ion

A

-2

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16
Q

what is the ionic charge of a sulphate ion

A

-2

17
Q

what is the ionic charge of a hydroxide ion

A

-

18
Q

what is the ionic charge of an ammonium ion

A

+

19
Q

what are the seven elements that exist as diatomic molecules

A

Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine and Iodine

20
Q

moles =

A

mass / Mr

21
Q

moles =

A

number of atoms / avogadros number

22
Q

Avogadro’s number

A

6.02 x 10^23

23
Q

moles =

A

volume (dm^3) / 24

24
Q

moles =

A

concentration (moldm^-3) x volume (dm^3)

25
Q

steps for empirical formula

A

calculate moles, divide by smallest, whole number ratio, empirical formula

26
Q

multiple =

A

relative molecular mass / mass of empirical formula

27
Q

% error =

A

[(number of readings x error) / amount] x 100

28
Q

how to identify x in a salt

A

calculate moles of water lost, ratio of anhydrous salt to water, moles of anhydrous salt, find Mr, identify x

29
Q

ideal gas equation

A

pressure (pa) x volume (m^3) = moles x 8.314 (Jmol^-1K^-1) x temperature (K)

30
Q

how to convert C to K

A

K = C + 273

31
Q

how to covert kPa to Pa

A

1kPa = 1000Pa

32
Q

room temp =

A

298K (25C)

33
Q

regular pressure =

A

100000Pa (100kPa)

34
Q

atom economy =

A

(molecular mass of wanted product / molecular mass of products) x 100

35
Q

percentage yield =

A

(actual amount / theoretical amount) x100

Year 12 Take 1 Chem (9 decks)

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