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Chemistry OCR B Alevel > Chemical Industry > Flashcards

Chemical Industry Flashcards

1
Q

Define rate of reaction

A

The change in the amount of reactants or products per unit of time

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2
Q

What is the rate constant? What can change it?

A

The k in rate=k (a)^m(b)^n

Affected by temperature

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3
Q

What is the order of a reaction?

A

The power of the concentration term in rate equation

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4
Q

What is the rate equation?

A

Rate = k(a)^m(b)^n

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5
Q

What is the half life of a reaction?

A

Time taken for a reactant to halve in quantity

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6
Q

What is the half life for first order?

A

Constant

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7
Q

What happens to the half life in zero order?

A

Decreases- straight line down

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8
Q

What happens to half life for second order?

A

It increases

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9
Q

What is the equation to calculate the rate constant of a first order reaction using half life’s?

A

K=ln2/half life

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10
Q

What is the gradient of the arenius equation?

A

-Ea/R

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11
Q

What is the intercept of the Arrhenius equation?

A

LnA

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12
Q

What is the rate determining step?

A

The slowest step in a multi step reaction

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13
Q

What must be in the rate determining step?

A

Anything in the rate equation

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14
Q

How can you predict the rate equation from the rate determining step?

A

The order of reaction with respect to a reactant shows the number of molecules of that reactant involved in the rate determining step

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15
Q

What can change Kc?

A

Temperature

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16
Q

What does adding a catalyst do to position of equilibrium?

A

Nothing

17
Q

how can you tell what is in the rate equarion?

A

any reactants introduced in or before the rate determining step

18
Q

what is the test for nitrate(v)?

A

warm with dervardas alloy and NaOH - ammonia gas evovles

19
Q

what is the test for ammonium?

A

warm with NaOH - ammonia gas evolves

20
Q

what is the 3 names of N2O?

A

nitrogen (i) oxide
dinitrogen monoxide
nitrous oxide

21
Q

what are the 3 names of NO?

A

nitrogen (ii) oxide
nitrogen monoxide
nitric oxide

22
Q

what are the 2 names of NO2?

A

nitrogen (iv) oxide

nitrogen dioxide

23
Q

what appearance is N2O?

A

colourless gas

24
Q

what is the appearance of NO?

A

COLOURLESS GAS - laughing gas has a sweet smell

25
Q

what is the appearance of NO2?

A

BROWN GAS - sharp odour and toxic

26
Q

how do you get from NO3- (NITRATE (V)) to nitrogen gas?

A

2NO3- + 12H+ + 10e-

27
Q

how do you get from nitrite to nitrate?

A

NO2- + H2O

28
Q

how do you get from NH4+ to NO2-

A

NH4+ + O2

29
Q

how do you get from nitrgoen to ammonia?

A

N2+3H2

30
Q

How do you get from nitrogen to NO?

A

N2 + O2 ——-> 2NO

31
Q

how di you get from nitrogrn to NO2?

A

N2 + 2O2 ——-> 2NO2

32
Q

How do you get from nitrogen to N2O?

A

2N2+O2——–> 2N2O

Chemistry OCR B Alevel (14 decks)

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