C19 - ENDOTHERMIC AND EXOTHERMIC REACTIONS Flashcards
what is an endothermic reaction?
a reaction which takes in energy from surroundings (usually as heat)
what is an exothermic reaction?
a reaction which transfers energy to surroundings (usually as heat)
what happens to the temp of reaction vessel during endothermic reactions?
temp decreases as energy is taken in
what happens to the temp of reaction vessel during exothermic reactions?
temp increases as energy is released
what is a reaction vessel?
container where chemical reactions take place
name 3 types of exothermic reactions
- combustion
- oxidation
- neutralisation
name a type of endothermic reaction
- thermal combustion
what is activation energy?
simplified - minimum amount of energy needed for reactants to react in a chemical reaction
the minimum amount of energy the reactant particles need in order to collide with each other and react
does a greater activation energy mean more or less energy is required to start the reaction?
more energy is required
give 2 uses of exothermic reactions
- hand warmers
- self-heating cans
give an example of an endothermic reaction
thermal combustion
is the reactants higher or lower on the reaction profile for an exothermic reaction?
higher
is the reactants higher or lower on the reaction profile for an endothermic reaction?
lower
where do reactants and products go on reaction profiles?
reactants - left
products - right
a reactant profile shows an exothermic reaction; will the reactants or the products be higher or lower?
reactants - higher
products - lower
a reactant profile shows an endothermic reaction; will the reactants or the products be higher or lower?
reactants - lower
products - higher
