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5.4 Rates of Change
Pages 169 - 174
Goal 1
Describe the 5 factors that affect reaction rates
Collision Theory (memorize this)
“chemical reactions can only occur if
particles collide with enough energy to
result in activation”
• 1. Temperature– High temp = faster reaction rate– Low temp = slower reaction rate– Why?.... collisions
• 2. Surface Area– More exposed surface area = faster– Less exposed surface area = slower– Why?.... collisions– Diet coke and Mentos ??
• 3. Concentrations– Higher concentration = faster – Lower concentration = slower– Why?.... collisions
• 4. Pressure– High pressure = faster – Low pressure = slower– Why?.... collisions
• 5. Mass– Less mass = faster– More mass = slower– Why?.... collisions
• Summary of 5 factors
–1. Temperature
–2. Surface Area
–3. Concentration
–4. Pressure
–5. Mass
Goal 2
Explain the affect a catalyst has on the rate of a reaction
• Catalysts change the rate of a reaction
– Catalysts themselves do not change or get used up
– Slows a reaction = Inhibitor
• Enzyme = biological catalyst
– Substrate = substance / reactants that are affected by enzyme
• Enzymes shape specific like a “lock & key”
– The enzyme “catalase” only breaks down hydrogen peroxide
Hydrogen peroxide water + oxygen
Goal 3
Explain chemical equilibrium
• Reversible reactions– SOME reactions are reversible– reversible reactions shown by
CaCO3
CaO + CO2
• Reversible reactions in Equilibrium system– will be in equilibrium– Equal amounts going both ways
CaCO3
CaO + CO2