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Chem Module 2 > 2.1 Atomic Structure And Isotopes > Flashcards

2.1 Atomic Structure And Isotopes Flashcards

1
Q

Isotope definition

A

Atoms of the same element with the same number of proton and different number of neutrons so different mass number

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2
Q

Relative isotopic mass definition

A

The mass of an atom of an isotope compared with 1/12 of the mass of an atom of carbon 12

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3
Q

Relative atomic mass definition

A

The weighted mean mass of an atom of an element compared with 1/12 of the mass of an atom of carbon 12

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4
Q

What is the difference between relative molecular mass and relative formula mass?

A

Relative molecular mass is used for simple molecules.
Relative formula mass is used for compounds of giant structures.

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5
Q

How do you workout the relative molecular mass Mr or the relative formula mass RFM from the relative atomic mass Ar ?

A

Add up all of the mass numbers of each atom and multiplied by the number of moles

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6
Q

What is the difference between isotopes of the same elements?

A

They may have different melting point, boiling point and density, but the chemical reactions are the same

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7
Q

How to determine relative atomic mass using the mass spectrometer

A
  1. sample is placed in the mass spectrometer
  2. Sample is vaporised and then ionised to form positive ions.
  3. The ions are accelerated, heavier ions move slowly and are more difficult to deflect then light ions so the ions of each isotope are separated.
  4. The ions are detected on a mass spectrum as a mass to charge ratio. each ion reaching the detector adds to the signal so the greater the abundance, the larger the signal.
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8
Q

Mass to charge ratio m/z =

A

Relative mass of ion
——————————
Relative charge on ion

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9
Q

How to work out the accurate relative atomic mass

A

(Ar of an isotope x abundance) + (Ar of an isotope x abundance) % 100

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10
Q

What is the relative mass of an electron?

A

1/1836

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11
Q

Formula of ion: zinc

A

Zn2+

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12
Q

Formula of ion: silver

A

Ag+

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13
Q

Formula of ion: ammonium

A

NH4+1

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14
Q

Formula of ion: ammonia gas

A

NH3

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15
Q

Formula of ion: hydroxide

A

OH-

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16
Q

Formula of ion: nitrate

17
Q

Formula of ion: hydrogen carbonate

18
Q

Formula of ion: phosphate

19
Q

Formula of ion: carbonate

20
Q

Formula of ion: sulphate

Chem Module 2 (7 decks)

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