5.1 to 5.10 Flashcards

1
Q

what is a mole ?

A

is the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of carbon-12

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2
Q

what is the Avogadro’s constant ?

A

the number of atoms per mole of the carbon - 12 is isotope - mol -1

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3
Q

how much is contained in 1 mole ?

A

6.02 x 10 (23) atoms / molecules

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4
Q

what is the equation to working out the number of particles ?

A

Avogadro’s number x number of moles

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5
Q

Equation for number of moles

A

mass / Mr

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6
Q

Equation for the percentage of mass of element

A

total mass of the element in the compound / relative formula mass of compound

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7
Q

molecular formula

A

the number and type of each atom in a molecule

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8
Q

empirical formula

A

the simplest whole-number ratio of atoms or ions of each element in a compound

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9
Q

what did Amedeo Avogadro propose in 1776-1856 ?

A

the law that equal volumes of gases at the same temperature and pressure contains equal numbers of molecules

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10
Q

what are the three things that the volume of a sample of a gas depend on ?

A

temperature
pressure
amount of gas in moles

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11
Q

what is the ideal gas equation ?

A
  • the behaviour of an ideal gas can be summed up by combining the gas laws into single equation

pV = nRT

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12
Q

Kelvin

A

K = *C + 273

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13
Q

Celsius

A

*C = K - 273

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14
Q

If your pressure is in Pa, what is your answer

A

m3

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15
Q

If your pressure is in KPa, your answer is in

A

dm3

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16
Q

what is the molar volume ?

A

the volume of 1 mole of a gas under stated ocnditions

17
Q

at room temperature and pressure, what is the molar volume of all gases ?

A

24 dm3 mol-1

18
Q

For a gas at RTP you use:

A

no. moles = volume/ 24
no. moles = volume/24,000

19
Q

what is concentration ?

A

how much solute is dissolved in a certain volume of a solution

20
Q

concentration equation

A

no. moles/ volume

21
Q

how do you convert from cm3 to dm3 ?

A

divide 1000

22
Q

how do you convert from dm3 to cm3 ?

A

multiply 1000