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Chem 2 > Moles And Volumes > Flashcards

Moles And Volumes Flashcards

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1
Q

What is the concentration of a solution?

A

This is the amount of solute, in moles, dissolved in each 1dm^3of solution.

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2
Q

What is a solute?

A

A dissolved compound.

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3
Q

What is the equation that links moles, volume and concentration together?

A

Moles= Concentration X Volume

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4
Q

What are the units for volume in the mol, vol, conc equation?

A

dm^3

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5
Q

How do you get from cm^3 to dm^3?

A

Divide by 1000

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6
Q

What is a standard solution?

A

This is a solution of a known concentration.

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7
Q

How do you prepare a standard solution?

A

Dissolve an exact mass of the solute in a solvent and make the solution is to an exact volume.

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8
Q

What is the main unit for concentration?

A

mol dm^-3

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9
Q

What are the other units for concentration that you may come across?

A

g dm^-3

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10
Q

How do you find the mass concentration of a substance?

A

Use mass=Mr X moles

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11
Q

Why do you indirectly count the number of gas molecules when you measure the gas volume?

A

At the same temperature and pressure, equal volumes of different gases contain the same number of molecules.

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12
Q

What is meant by molar gas volume?

A

This is the volume per mole of gas molecules at a stated room temperature and pressure.

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13
Q

What is the abbreviation for a molar gas volume?

A

Vm (it’s a little m)

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14
Q

What are the conditions for RTP?

A

20 degrees C

101 kPa

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15
Q

What is the volume of 1 mole of gas molecules at RTP?

A

24 dm3mol-1

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16
Q

What is the equation for gases at RTP?

A

Moles=volume/24

17
Q

In the equation for RTP gases what are the units for volume?

A

dm3

18
Q

What are the 4 assumptions for the molecules making up an ideal gas?

A

Random motion
Elastic collisions
Negligible size
No intermolecular forces

19
Q

What is the ideal gas equation?

A

pV=nRT

20
Q

What is the value of R, the gas constant?

A

8.134

21
Q

What are the units for pressure in pV=nRT?

A

Pa

22
Q

What are the units for volume in pV=nRT?

A

M3

23
Q

What are the units for n in the ideal gas equation?

A

Mol

24
Q

What are the units for temperature in pV=nRT?

A

K

25
Q

How do you get from cm3 to m3?

A

X10^-6

26
Q

How do you get from dm^3 to m^3?

A

X10^-3

27
Q

How do you get from C to K?

A

+273

28
Q

How do you get from kPa to Pa?

A

X10^3

Chem 2 (17 decks)

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