C6 Flashcards
Mean rate of reaction
Reactants used(product formed)/time
Measuring Change in mass
Reaction gives off a gas
Measure using mass ballance
Measuring change in volume
Reaction gives off a gas
-gas syringe
Factors Affecting rate of reaction
TEMP-particles have more energy-move faster-more frequent collisions+more success as particles have required activation energy
CONC/PRESSURE-more particles in same volume-more frequent collisions
SA-breaks solid into smaller pieces-more surfaces to collide with-more frequent collisions
CATALYST-lower activation energy-more success collisions
Le Chateliers principle
In a REVERSIBLE reaction you change the conditions, the system will try to counteract or oppose than change
Precipitation or colour change practical
+
What will affect your results
Time how long it to takes for cross to disappear or colour change to occur
Results are subjective-eyesight
Equilibrium definition
In a CLOSED SYSTEM the RATE of the FORWARDS and REVERSE reaction are the same
Ammonia- n2+3h22nh3 Exothermic
Increasing or decreasing the temp
Increase=equilibrium shifts to favor the left (reverse)
Decrease=equilibrium shifts to the right(forwards)
Forwards reaction
Makes products
Reverse reaction
Makes reactants
If equilibrium shifts to the left what happens
More reactants are made
Ammonia. n2+3h22nh3 Exothermic Increasing pressure (decreasing volume)
Shifts equilibrium to side with least moles (right)
Ammonia n2+3h22nh3 Exothermic
Removing a product
Adding a product
Removing = equilibrium shifts to favor right(forwards) Adding = equilibrium shifts to favor left(reverse)
Ammonia n2+3h22nh3 Exothermic
Adding a reactant
Removing a reactant
Adding=equilibrium shifts to favor right(forwards)
Removing =equilibrium shifts to favor left(reverse)
