endo and exothermic

Exothermic Reaction

a chemical reaction that releases energy by light or heat.
Temp goes up
Loose energy——Vibrate less——atoms stay close together

Endothermic Reaction

a process or reaction in which the system absorbs energy from its surroundings
Temp goes down
Gains energy——Vibrates more——atoms get further apart, bonds might even break

Examples endothermic reactions

cooking an egg, baking bread, photosynthesis, water evaporation, dissolving salt in water

evaporation
melting
boiling

Examples of exothermic reactions

water and acid reaction, campfire, rusting, nuclear fission, freezing water into ice

condensation
freezing

Exothermic (reactant product)

reactant energy=high
product energy=low

Endothermic (reactant product)

Reactant=low energy

Product=high energy

what must happen for bonds to break

energy must be absored

Enthalpy

a measure of an increase or decrease of energy in a chemical reaction

Entropy

a measure of much atoms in a substance are free to spread around
measurement of disorder or randomness of energy in a system

Solids entropy

low entropy, energy is low and atoms are not moving much

Gas entropy

high entropy, high energy, atoms are moving around

finish the sentence
During a chemical reaction

bonds in the reactants break while new bonds are formed form in the product