c5 energy changes Flashcards
what is an exothermic reaction
a reaction that gives out heat energy to its surroundings
what is endothermic
a reaction that takes in heat energy from to its surroundings
what us the activation energy of a chemical reaction
the minimum amount of energy required to start a reaction
what are the following reactions are exothermic
oxidation and ions
neutralisation
combustion
what happens to the surroundings temperature in a endothermic reaction
decreases
what happens to the surroundings temperature in a exothermic reaction
increases
what are the following reactions for endothermic
thermal decomposition
citric acid and sodium hydrogen carbonate
how are the products and reactions shown in an endothermic reaction
products are at a higher energy than reactants
reactants=low
products=high
how are the products and reactions shown in an exothermic reaction
the products are at a lower energy than the reactants
product=low
reactants=high
what is a product
a new chemical that is made after the reaction took place
what is a reactant
the substance that is used in a reaction
what is one thing that energy must do
always be supplies to break bonds
what reaction is bond breaking
endothermic
what reactions is bond forming
exothermic
what is energy change
energy breaking bonds in reactants-energy released making bonds in products
what happens during a chemical reaction
old bonds are broken to form new bonds
are reactants and products shown as high or low for endothermic reaction profiles
reactants are low
products are high
are reactants and products shown as high or low for exothermic reaction profiles
reactants high
products low
what are reaction profiles
Reaction profiles can be used to show the relative energies of reactants and products,activation energy and overall energy reaction
how can u tell reactions are taking place
change in colour
change in temperature
change in odour
a new substance formed
how can u tell if something is a exothermic reaction?
gets hotter
heat / energy is given off
what’s rate of reaction
is the speed at which a chemical reaction takes place
