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RSFC Y13 CHEM 2023 > Rates - Practical > Flashcards

Rates - Practical Flashcards

1
Q

Define Rate of reaction.

A

Change in concentration per unit time.

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2
Q

What are the units of rate?

A

mol dm-3 s-1

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3
Q

Define activation energy.

A

Minimum energy required for a reaction to occur.

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4
Q

How does a rate change when the concentration of a zero order species is doubled?

A

Rate would stay the same.

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5
Q

How does a rate of reaction change when the concentration of a first order species is doubled?

A

Rate would also double.

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6
Q

How does a rate of reaction change when the concentration of a second order species is doubled?

A

It would multiply by 4.

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7
Q

What are the two experimental methods for measuring a rate of reaction.

A

Continuous monitoring method and initial rates method.

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8
Q

How can a continuous monitoring practical be tracked?

A

Measure the concentration of reactants at regular time intervals.

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9
Q

What graph can be plotted from a continuous monitoring practical?

A

A concentration time graph.

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10
Q

How can a an initial rate be found on a concentration time graph?

A

draw a tangent at t=0 and calculate gradient.

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11
Q

Which equation is used to calculate a gradient?

A

dy/dx

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12
Q

Complete the missing spaces with changes in concentration, rate, and order of reaction.

A
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13
Q

Complete the missing spaces with changes in concentration, rate, and order of reaction.

A
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14
Q

Complete the missing spaces with changes in concentration, rate, and order of reaction.

A
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15
Q

Complete the missing spaces with changes in concentration, rate, and order of reaction.

A
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16
Q

Complete the missing spaces with changes in concentration, rate, and order of reaction.

A
17
Q

How is an initial rates practical carried out?

A

Vary the concentration of 1 of the reactants and measure the time taken to react the endpoint.

18
Q

How is rate of calculated the initial rates method.

A

rate = 1/t

19
Q

why is rate 1/t in the initial rates method?

A

As the concentration of the product formed at the end point of the reaction is
fixed, it
can be taken as a constant.

20
Q

What does a rate concentration graph looks like for a zero order reaction?

A
21
Q

What does a rate concentration graph looks like for a zero order reaction?

A
22
Q

What does a rate concentration graph looks like for a zero order reaction?

A
23
Q

During an experiment, How can the order of a reactant be changed to be come zero order?

A

Use a large excess of that reactant as the concentration change would be negligible so its concentration can be taken as constant.

RSFC Y13 CHEM 2023 (18 decks)

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