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BMAT [Personal] > Chemistry > Flashcards

Chemistry Flashcards

1
Q

Why does the melting point of an impure substance chane?

A

Disrupted structure,

Intermolecular forces-change

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2
Q

Kc (equilibrium constant) formula

A

Product/reactants

Number in front of element&raquo_space; ยกกำลัง

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3
Q

HF HCl HBr HI

Boiling point and reason

A

Highest
HF - hydrogen bonds

London forces
HI - most electrons
HBr
HCl - least electrons
Lowest
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4
Q

Structural isomers includes…

A

Functional group
Chain
Position

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5
Q

Examples of hydrides…

A

Ionic hydride hydrides : LiH

Covalent hydrides: HF

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6
Q

‘A’ is the conjugate acid of ‘B’ meaning

A

A is made from B and H+

B must be a base

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7
Q

Acid is…

A

Bronsted Lowry&raquo_space; proton donor
Lewis&raquo_space; electron pair receiver
Arrhenius» produce H+ ions when dissolved

All Bronsted is Lewis but not all Lewis is Bonstred

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8
Q

KE gas law

A

1.5RT

Where R is 8.3145 J mol-1 K-1

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9
Q

Effects on KE

  1. Increase mole (constant pressure and volume)
  2. Increasing pressure (constant Volume and mole)
  3. increasing volume (constant pressure and mole)
A

KE…

1) no effect
2) increase
3) increase temp thus KE

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10
Q

Celcius and Kelvin

A

0C= 273K

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11
Q

R (ideal gas constant)

A

8.314 J mol-1 K-1

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12
Q

Lithium flame test

A

Red

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13
Q

Sodium flame test

A

Yellow-orange

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14
Q

Potassium flame test

A

Purple

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15
Q

Rubidium flame test

A

Red

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16
Q

Caesium flame test

A

Blue-violet

17
Q

Calcium flame test

A

Orange-red

18
Q

Stronium flame test

A

Red

19
Q

Barium flame test

A

Pale green

20
Q

Copper flame test

A

Blue-green

21
Q

Lead flame test

A

Greyish white

22
Q

Naoh + warm =

A

Ammonia produced

Test for nh4+

23
Q

Acidified Barium chloride solution

White ppt

A

Test for So4 (2-) ions

24
Q

Acidified silver nitrate (agno3)
ppt colour?

Ammonia
Dissolve in dilute?
Excess?

UV
Turns what colour

A

Cl-
White ppt
Dissolve in dilute
Purple

Br-
Cream ppt
Dissolve in concentrated
Green

I-
Yellow ppt
Insoluble
No change

25
Q

Homogenous

Heterogenous

A 
Homo= evenly mixed
Hetero = layers
26
Q

How to calculate pH

A

pH=-log[H ions mol]

27
Q

How to calculate pH

A

pH=-log[H ions mol]

28
Q

Bond breaking

A

Endo

29
Q

Bond making

A

Exo

30
Q

Water self ionizes

Increase in temp
effect on pH
Effect on conductivity

A

Ph -Decrease, more ionization, more H+

Conductivity increase

31
Q

Which oxides are acidic

A

Ones with central atoms with high electronegativity

32
Q

Molarity

A

Moles per litre

BMAT [Personal] (4 decks)

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