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Chemistry IB > Stoichiometric Relationships > Flashcards

Stoichiometric Relationships Flashcards

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1
Q

What is a gas to a solid?

A

deposition

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2
Q

What is a solid to a gas?

A

sublimation

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3
Q

What is a homogenous mixture?

A

A homogenous mixture has the same (uniform) composition throughout the mixture and consists of only one phase.

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4
Q

What is a heterogenous mixture?

A

A heterogenous mixture does not have uniform composition and consists of separate phases. They can be separated by chemical means. E.g. sand in a beaker.

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5
Q

What is relative atomic mass?

A

The relative atomic mass of an element is the average of the masses of the isotopes in a naturally occurring sample of the element relative to the mass of 1/12 of an atom of carbon-12.

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6
Q

How many atoms are there in a mole?

A

6.02x10^23 AVOGADROS CONSTANT

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7
Q

What is Avogadro’s constant?

A

It is the number of atoms in a mole.

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8
Q

How do you calculate molar mass?

A

Times the number of moles by Avogadro’s constant.

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9
Q

What is an ideal gas?

A

Equal volumes of ideal gases measured at the same temperature and pressure contain the same number of molecules.

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10
Q

What are the assumptions we make about ideal gases?

A
  1. The molecules themselves have no volume

2. No forces exist between these molecules

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11
Q

What is standard temperature and pressure?

A

273 K and 100Kpa

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12
Q

What is the molar volume of a gas at STP?

A

22.7

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13
Q

How do you work out the number of moles of a gas?

A

Volume/molar volume

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14
Q

What is the conversion between Celsius and Kelvin?

A

Degrees = kelvin - 273

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15
Q

What is the relationship between pressure and volume of ideal gases?

A

At constant temperature, the volume of a fixed mass of an idea gas is inversely proportional to its pressure.

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16
Q

What is the relationship between volume and temperature of ideal gases?

A

The volume of a fixed mass of an ideal gas at constant pressure is directly proportional to its kelvin temperature.

17
Q

What is the relationship between pressure and temperature of ideal gases?

A

For a fixed mass of an ideal gas at constant volume the pressure is directly proportional to its absolute temperature.

18
Q

What is the ideal gas equations?

A

P1V1/T1 = P2V2/T2

PV=nRT

PRESSURE IS JUST IN P
AND TEMPERATURE IS IN KELVIN
VOLUME IS IN M3

19
Q

What is R?

A

R is the gas constant it is 8.31

20
Q

What is concentration?

A

Moles/volume

21
Q

How do you work out the concentration of very dilute solutions?

A

You work out concentration in parts per million - ppm

You put the mass of solute x10^6 /mass of the solution

For gases you put the volume of gasx10^6/volume of air1

Chemistry IB (9 decks)

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