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Chem > 1.. > Flashcards

1.. Flashcards

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1
Q

homogeneous mixture

A

all components are the same phase.
- uniform composition and uniform properties

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2
Q

Heterogeneous mixture

A

the components are in different phases
- non-uniform composition
- varying properties

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3
Q

solid to liquid

A

melting

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4
Q

liquid to solid

A

freezing

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5
Q

liquid to gas

A

vaporization

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6
Q

gas to liquid

A

condensation

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7
Q

gas to solid

A

deposition

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8
Q

solid to gas

A

sublimation

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9
Q

convert number of particles to moles

A

divide by Avogadro number (6.02x10^23)

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10
Q

convert moles to number of particles

A

x Avogadro number (6.02x10^23)

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11
Q

triangle for converting between mass, moles and molar mass

A
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12
Q

How to find Empirical Formula

A

the simplest whole number ration of atoms/amount of each element present ina compound
1. fint the amount (mol) of each atom
2. find the smallest whole number ratios
3. use these values as subscripts

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13
Q

percentage composition by mass

A

mass of element in compound x 100/ Molar mass of compount

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14
Q

finding limiting reactant

A
  1. find the moles of both reactants
  2. divide each amount by the respective reactant’s coefficient
  3. the lowest value us the limiting reactant
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15
Q

calculate theoretical yield

A
  • is what theoretically be produces under ideal conditions
    1. determine the limiting reactant
    2. use the molar ratios of the limiting rectant and the product to find the moles of the product
    3. convert moles of product into mass
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16
Q

experimental yield

A

what is actually produced
- loss of product from reaction vessels
- impurity of reactnats
- un-ideal conditions
- reverse reactions consuming products in equilibrium system
- existence of side reactions due to the presence of impurities

17
Q

Percentage yield

A

(experimental yield / theoretical yield) x 100

18
Q

triangle for converting volume, amount in mol, and molar volume of an ideal gas

A

STP : 22.7 dm3

19
Q

ideal gas law conditions

A

STP
Pressure - Pascals
Volume - m3 (1000dm3)
moles - mol
R - gas constant
T - absolute temperature (K)

20
Q

Pressure and Volume - ideal gas

A

P1V1 = P2V2, P is inversely proportional to V

21
Q

Pressure and Temperature (K) - ideal gas

A

P1/T1 = P2/T2, P is directly proportional to T

22
Q

Volume and Temperature - ideal gas

A

V1/T1 = V2/T2, V is directly proportional to T

23
Q

Ideal gas equations

A

(V1P1)/T1=(V2P2)/T2
PV=nRT

24
Q

triangle for calculating mol,concentration, and volume

A

volume must be in dm3, divide cm3 by 1000

Chem (13 decks)

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