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chemistry > chemical reactions (redox, speed of reaction) > Flashcards

chemical reactions (redox, speed of reaction) Flashcards

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1
Q

during reduction, do we lose or gain oxygen?

A

lose

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2
Q

during reduction, do we lose or gain hydrogen?

A

gain

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3
Q

during reduction, does oxidation state increase or decrease?

A

decrease

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4
Q

during reduction, do we gain or lose electrons?

A

gain

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5
Q

during oxidation, do we lose or gain oxygen?

A

gain

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6
Q

during oxidation, do we lose or gain hydrogen?

A

lose

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7
Q

does the oxidation state increase or decrease during oxidation?

A

increase

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8
Q

during oxidation, do we lose or gain electrons?

A

lose

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9
Q

what is used to test for reducing agent?

A

use acidified potassium manganate (VII)

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10
Q

what is the colour change of acidified potassium manganate (VII) when the solution is a reducing agent?

A

the acidified potassium manganate (VII) changes from purple to colourless

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11
Q

what is used to test for oxidising agent?

A

potassium iodide

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12
Q

what is the colour change of potassium iodide when the solution is an oxidising agent?

A

the potassium iodide changes from colourless to brown

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13
Q

does the speed of reaction increase or decrease when the the temperature increases?

A

increase

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14
Q

does the speed of reaction increase or decrease when the concentration of the acid/solution increases?

A

increase

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15
Q

does the speed of reaction increase or decrease when the surface area of a solid decrease?

A

decrease

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16
Q

does the speed of reaction increase or decrease when the pressure of the gas increase?

A

increase

17
Q

how does increase in concentration of acid increase speed of reaction?

A

number of moles of hydrogen ions packed per unit volume increases causing more frequent effective collisions between particles leading to faster reaction

18
Q

how does increase in temperature of solution increase speed of reaction?

A

reacting particles gain kinetic energy and move faster causing more frequent effective collisions between particles leading to faster reaction

19
Q

how does decrease in particle size increase speed of reaction?

A

the surface area to volume ratio increases, the frequency of effective collision between particles increases causing speed of reaction to increase

20
Q

how does increase in pressure cause increase in speed of reaction?

A

as pressure increases, gas molecules are spaced closer together causing increase in frequency of effective collision between particles and speed of reaction increases

chemistry (10 decks)

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