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Chemistry a-level > Physical- Amount of Substance > Flashcards

Physical- Amount of Substance Flashcards

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1
Q

Define relative atomic mass

A

The average mass of an atom

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2
Q

Define a mole

A

The unit used to measure the amount of a substance

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3
Q

What is the equation for moles?

A

Moles = mass divided by
Mr

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4
Q

What is the equation for percentage yield?

A

actual yield x by 100
theoretical yield

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5
Q

What is the atom economy?

A

A measure of the amount of starting materials that become useful products

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6
Q

What is the equation for atom economy?

A

Mr of desired product x by 100
Mr of reactants of equation

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7
Q

What is the equation for concentration?

A

amount of solute in g
volume of solution in dm3

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8
Q

What is the empirical formula?

A

The simplest whole number ratio of atoms of each element in a compound

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9
Q

What is the molecular formula?

A

The true number of each atom in the molecule

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10
Q

What is the ideal gas equation?

A

PV=nRT

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11
Q

What are the ideal gas equation units?

A

P= pressure, measured in Pa
V= volume, measure in m3
n= number of moles
R= gas constant
T= temperature, measured in K

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12
Q

How do we find the temperature in kelvin (only if it is initially given in degrees)?

A

Number of degrees + 273= K

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13
Q

How do we find the pressure in Pa?

A

kPa x 10(3) = Pa
MPa x 10(6) = Pa

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14
Q

How do we find the volume in m(3)?

A

dm(3) x 10(-3) = m(3)
cm(3) x 10(-6) = m(3)

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15
Q

What equations do we use for solution calculations?

A

concentration= mass (g) divided by volume (dm3)
mass= moles x Mr

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16
Q

How to calculate percentage uncertainty?

A

uncertainty divided by value x100

17
Q

How do you convert between dm cubed and metres cubed?

A

Divide by 1000 (thousand)

18
Q

How can you increase the atom economy of a process?

A

Find A use/buyer of the other products

19
Q

Define relative atomic mass

A

The average mass of an atom of an element divided by one twelfth of the mass of an atom of carbon-12

20
Q

What formula links volume, concentration and moles?

A

Moles = concentration x volume

21
Q

How do you convert between kPa and Pa?

A

Times by 1000 (thousand)

22
Q

What is the atom economy of a process with only one product?

A

100 %

23
Q

Define relative molecular mass

A

The average mass of a molecule divided by one twelfth of the mass of an atom of carbon-12

24
Q

How do you convert between cm cubed and meters cubed?

A

Divide by 1000000 (million)

Chemistry a-level (14 decks)

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