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Chem - A level (units 1 -10) > Equations > Flashcards

Equations Flashcards

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1
Q

What is the equation for wave speed?

A

1) Wave speed = wavelength x frequency

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2
Q

What is the equation for the energy of a photon?

A

1) E = hF

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3
Q

What is the equation for % relative isotopic abundance?

A

% relative abundance for certain isotope

total relative abundance

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4
Q

What is the equation for moles?

A

mass

molar mass (RAM)

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5
Q

What is the equation for atom economy?

A

Mr useful product

———————————————————————-× 100

Mr of all reactants

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6
Q

What is the equation for moles in relation to concentration?

A

1) moles = concentration x volume dm(3)

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7
Q

How do you convert from cm(3) to dm(3)

A

cm(3)

1000

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8
Q

What volume is equal to 1dm(3)

A

1000ml

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9
Q

What is the equation for % purity?

A

mass compound

———————— x100

mass sample

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10
Q

What is the equation for converting from g –> mols?

A

concentration mols = concentration g

molar mass

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11
Q

Equation for finding number of particles =

A

Number of moles x Avogadro’s constant

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12
Q

What is the equation for percentage yield?

A

actual yield

—————— x100

theoretical yield

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13
Q

What is the equation for making a standard solution from a more concentrated solution?

A

Volume to use = desired concentration

——————————– x desired volume

actual concentration

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14
Q

percentage error for one reading?

A

error

——— x100 (x by number of readings taken)

reading

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15
Q

How do you remove the mol-1 sign?

A

divide or times by avogadros constant

or

dividie by mols

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16
Q

What two units are interchangable?

A

g and cm3

17
Q

What is the equation for enthalpy change / energy transferred?

A

specific heat capacity x mass (cm3) x change in temp (0c)

18
Q

What unit is enthalpy change given in?

A

KJ

19
Q

What is the equation for pV (pressure Pa/Nm-2)(volume m3)?

A

nRT

(no moles) x (gas constant) x (temp in kelvin)

20
Q

To to convert from dm3 —> m3

A

/1000

21
Q

What is a rule for titration readings?

A

Titration readings must be to 2 decimal places, with the final digit a 5 or a 0

22
Q

What is the equation for Kc?

A

(conc. product)2

(conc. reactant 1) (conc. reactant 2)

23
Q

% purity?

A

Mass pure substance

—————————— x 100

mass impure sample

24
Q

What is the RF value?

A

distance travelled by solute

distance travelled by solvent

Chem - A level (units 1 -10) (14 decks)

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