chemical reactions (redox, speed of reaction)
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during reduction, do we lose or gain oxygen?
lose
during reduction, do we lose or gain hydrogen?
gain
during reduction, does oxidation state increase or decrease?
decrease
during reduction, do we gain or lose electrons?
gain
during oxidation, do we lose or gain oxygen?
gain
during oxidation, do we lose or gain hydrogen?
lose
does the oxidation state increase or decrease during oxidation?
increase
during oxidation, do we lose or gain electrons?
lose
what is used to test for reducing agent?
use acidified potassium manganate (VII)
what is the colour change of acidified potassium manganate (VII) when the solution is a reducing agent?
the acidified potassium manganate (VII) changes from purple to colourless
what is used to test for oxidising agent?
potassium iodide
what is the colour change of potassium iodide when the solution is an oxidising agent?
the potassium iodide changes from colourless to brown
does the speed of reaction increase or decrease when the the temperature increases?
increase
does the speed of reaction increase or decrease when the concentration of the acid/solution increases?
increase
does the speed of reaction increase or decrease when the surface area of a solid decrease?
decrease
does the speed of reaction increase or decrease when the pressure of the gas increase?
increase
how does increase in concentration of acid increase speed of reaction?
number of moles of hydrogen ions packed per unit volume increases causing more frequent effective collisions between particles leading to faster reaction
how does increase in temperature of solution increase speed of reaction?
reacting particles gain kinetic energy and move faster causing more frequent effective collisions between particles leading to faster reaction
how does decrease in particle size increase speed of reaction?
the surface area to volume ratio increases, the frequency of effective collision between particles increases causing speed of reaction to increase
how does increase in pressure cause increase in speed of reaction?
as pressure increases, gas molecules are spaced closer together causing increase in frequency of effective collision between particles and speed of reaction increases