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Chemistry > Additional info > Flashcards

Additional info Flashcards

1
Q

Catalyst

A

A substance that increases the rate of the reaction by decreasing the activation energy of the reaction and is unchanged at the end of the reaction

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2
Q

Decreasing particle size =

A

Increasing surface area

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3
Q

what does this symbol mean ⇌

A

Reversible reaction

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4
Q

Oxidation meaning

A

Gain Oxygen
Lose Hydrogen
Lose electrons
Increase in oxidation state

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5
Q

Reduction meaning

A

Lose Oxygen
Gain Hydrogen
Gain electrons
Decrease in oxidation state

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6
Q

Increase in oxidation state
meaning

A

Lose electrons

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7
Q

Decrease in oxidation state meaning

A

Gain electrons

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8
Q

Oxidation state meaning

A

the number of electrons lost or gained by an atom to form a compound

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9
Q

Halogen AS NOT AQUEOUS:
colour
state at room temeprature

A
  1. Chlorine
    Pale yellow-green
    Gas
  2. Bromine
    Red - Brown
    Liquid
  3. Iodine
    Grey-black
    Solid
  4. Astatine
    Black
    Solid
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10
Q

Halogen colours as AQEUOUS IN SOLUTION (after displacement reaction)

A

Bromine = Orange-brown solution

Iodine = Dark-brown solution

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11
Q

Cation colours

A

Iron 2+= Green solution

Chromium 3+= grey-green solution

Copper 2+ = Blue solution

Iron 3+ = yellow solution

Copper Oxide = Black solid

Copper Metal = pink brown solid

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12
Q

How to do a flame test:

A

Place salt on wooden split, into bunsen burner flame

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13
Q

What happens to rate of reaction as time increases

A

Decreases (as molecules get used up)

Then reaction stops (all molecules used up)

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14
Q

The term used for the transfer of thermal energy during a reaction

A

Enthalpy change

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15
Q

Activation energy meaning

A

The minimum amount of energy that colliding particles must have to react

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16
Q

Relative Atomic Mass

A

The average mass of the isotopes of an element compared to 1/12th of the mass of an atom of Carbon-12

17
Q

Reactions of group 1 with COld water

A

Lithium= readily
Sodium = vigorously
Potassium = violently

18
Q

Sacrificial protection key points

A

More reactive than iron
Oxidised instead of iron and loses electron

Chemistry (8 decks)

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