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Alevel Chemistry OCR A > Defintions For Module 2 > Flashcards

Defintions For Module 2 Flashcards

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1
Q

Atomic number

A

Neuter of protons in the nucleus

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2
Q

What is an ion

A

Charged atom or molecule

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3
Q

What is an isotope

A

Atom of the same element with he same number of protons and electrons but different number of neutrons

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4
Q

What is the mass number

A

Total number of protons and neutrons

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5
Q

What is mass spectrom,entry

A

Instrument which gives accurate information about relative isotopic mass and relative abundance of isotopes

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6
Q

What is the relative atomic mass

A

Weighted mean mass of an atom of an element when compared to 1/12th mass of an atom of carbon 12

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7
Q

What is relative isotopic mass

A

Mass of an atom of an isotope when compared to 1/12th mass of an atom of carbon12

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8
Q

What is relative formula mass

A

Mass of the formula unit of a compound with a giant structure

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9
Q

What is an ionic compound

A

Compound which is made up of oppositely charged ions that are held together by electrostatic forces of attraction

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10
Q

What does anhydrous mean

A

Crystalline compound containing no water

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11
Q

What is atom economy

A

Measure of amount of starting material,s that end up as useful products

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12
Q

What is the equation for percentage atom economy

A

Mr of desired product
———————————. X100
Sum of Mr of all reactants

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13
Q

What is avogadros constant

A

Number of particles per mole of substance
6.02 x10^23

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14
Q

What is a empirical formula

A

Simplest whole number ratio f atoms of each element present in a compound

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15
Q

What does hydrated mean

A

Crystalline compound that’s contains water

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16
Q

What’s the ideal gas equation

A

pV = nRT

17
Q

What is molar gas volume

A

Volume of 1mole of gas in dm^3 mol^-1

18
Q

What is molar mass (Mr)

A

Mass per mole of substance in g mol^-1

19
Q

What is a mole

A

Amount of a substance containing as many particles as there are carbon atoms in exactly 12g of carbon12 isotope

20
Q

What is percentage yield

A

Percentage ratio of actual yield of a product from a reaction compared to theoretical yield

21
Q

What is the percentage yield equation

A

Actual yield
———————— x100
Theoretical yield

22
Q

What is relative molecular mass

A

Average mass of one molecule of an element or compound compared to 1/12 mass of an atom of carbon 12

23
Q

What is water of crystallisation

A

Water molecules that form part of the crystalline structure of a compound

24
Q

What is the equation for relative atomic mass

A

(m/z X %) + (m/z X %)
——————————
100

25
Q

What the link between moles mass and mr

A

Mol = mass (g)/ Mr

26
Q

Link for number of atoms or molecules

A

no.= mole x (6.02 x 10^23)

Alevel Chemistry OCR A (13 decks)

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