C7 rate + energy changes Flashcards
In an energy change calculation what do you take away from what
DONT OVER THINK
Reactants - Products
How does the reaction profile show that an equation is endothermic
- Product has more energy than reactants
- Energy change is positive
- Therefore heat energy has been absorbed
In terms of bond-breaking and making why are some reactions exothermic
Breaking bonds needs energy
Making bonds releases energy
More energy is released than absorbed
In terms of bond-breaking and making why are some reactions endothermic
Breaking bonds requires energy
Making bonds releases energy
More energy is absorbed than released,
practical to investige rate of reaction
- mix hydrochloric acid + sodium thiosulphate
measure time until cross disappears - repeat at different temperatures
increasing turbidity
becoming more cloudy
how does increasing temp increase rate
more energy meaning higher chance of successful collision
exothermic reaction profile
starts big EXPLOSION
goes small and heat energy dissipates to the surroundings leaving a little ashen man
order of breaking and making bonds
bonds broken first, then made
