SME
Grade 10 Science
Reaction rates and chemical equilibrium
The main lesson, then each kind of problem it solves.
Reaction rates and chemical equilibrium
Main lesson
Le Châtelier: Q against K
Use this for “H₂ is added to H₂ + I₂ ⇌ 2HI at equilibrium. Which way does it shift?”
What a catalyst changes
Use this for how much a catalyst lowers the activation energy, forward and back.
Average reaction rate
Use this for “[A] falls from 1.20 mol/L at 30 s to 0.75 mol/L at 120 s. What is the average rate?”
Solubility product
Use this for AgCl, a salt that barely dissolves: its Ksp from its molar solubility, or the solubility from Ksp.
Which way does the equilibrium shift?
Use this for “N₂ + 3H₂ ⇌ 2NH₃ gives off heat. Which way does it shift when it is cooled?”
What speeds up a reaction?
Use this for “Why does a crushed antacid tablet fizz faster than a whole one?”