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Chemistry > Transition Metals > Flashcards

Transition Metals Flashcards

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1
Q

What is the contact process?

A

-SO2 -> SO3
-Using V2O5 catalyst

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2
Q

Give the equations of the contact process?

A

1) V2O5 + SO2 -> SO3 + V2O4
2) V2O4 + 1/2O2 -> V2O5

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3
Q

What is a homogenous catalyst?

A

When the catalyst is in the same state as the reactants.

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4
Q

What is a heterogenous catalyst?

A

When the catalyst is in a different state to reactants.

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5
Q

How does a heterogenous catalyst work?

A

Reactants adsorb to the active site of catalyst this weakens bonds then they will then desorb

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6
Q

How does a homogenous catalyst work?

A

Forms an intermediate species which reacts to reform the catalyst.

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7
Q

What is autocatalysis?

A

Is a homogenous catalyst where the product is the catalyst itself.

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8
Q

What is an example of auto catalysis?

A

Mn2+ in the reaction o MnO4- and C2O4 2-

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9
Q

What are the different oxidation states of Vanadium?

A

+1
+2
+3
+4
+5

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10
Q

What colour is Vanadium +2?

A

Violet

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11
Q

What colour is Vanadium +3?

A

Green

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12
Q

What colour is Vanadium +4 and what is its formula?

A

-VO +2
-Blue

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13
Q

What colour is Vanadium +5 and what is its formula?

A

-VO2+
-Yellow

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14
Q

How is VO2+ reduced to form V2+?

A

Zinc in acid

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15
Q

What is the formula of tollens reagent?

A

[Ag(NH3)2]+

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16
Q

What is the formula used to find the energy difference between ground and excited state of d-shell electrons?

A

∆E = hν = hc/λ

17
Q

what is h in ∆E = hν = hc/λ

A

Plancks constant

18
Q

What is the v in ∆E = hν = hc/λ

A

Frequency of absorbed light (Hz)

19
Q

What is the λ in ∆E = hν = hc/λ

A

Wave length (m)

20
Q

What is the c in ∆E = hν = hc/λ

A

The speed of light (3×10^8 m/s)

21
Q

Why are transition metal ions coloured?

A

As they absorb some visible light wavelengths to promote electrons in d-subshells, which transmits the remaining light to produce a colour.

22
Q

What is the Chelate effect?

A

The replacement of monodentate ligands with bidentate and multidentate ligands in complex ion

23
Q

Why is carbon monoxide toxic?

A

As it substitutes the oxygen ligands on the Fe2+ in haemoglobin (the ligands formed are stronger so oxygen can no longer bond)

24
Q

How many ligands can Cl- form and why?

A

4 as they a large

25
Q

What Molecule readily Chelates?

A

EDTA4-

26
Q

Why does the chelate effect occur?

A

As it always has negative Gibbs free energy so is always feasible

Chemistry (28 decks)

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