Chemical Reactions Flashcards
Define exothermic reactions
Reactants release energy into the SURROUNDINGS. Container will HEAT, while reactants COOL
Define exothermic reactions
Reactants take in energy energy from the SURROUNDINGS. Container will COOL, while reactants HEAT UP
What is enthalpy?
Reaction energy (Change in energy during reaction) ∆H > 0 (Endothermic) ∆H
Name the factors influencing rate of reaction
- Temperature
- Surface area of reactants
- Concentration or pressure (g)
- Catalysts
Why do catalysts speed up reactions?
They lower the activation complex, therefore less energy is required for the reaction to start
State two formulas for calculating the average rate of reaction
Total reactant/total time
OR
Total formed/total time
How does one calculate instantaneous rate?
Draw a tangent and use the gradient formula
Name for compounds which wil never break up
- Diatomic molecules
- Metals (Duh)
- Carbon
- Sulphur
Define oxidation
Lost electrons
Define reduction
Gain electrons
What will be observed when a hydrated compound is heated?
Moisture will condense inside the test tube
How does one calculate Kc for gases using pressure?
Kc = Pressure (RH)/Pressure (LH)
State Le Chatelier’s principle
A system in equilibrium will counteract a disturbing factor until equilibrium has been reached again.
