thermochem

thermochem

study of energy chaneg associated with chemical reactions and physical transformations.

exothermic

relsease energy into its surroundings

endothermic

absorb energy

heat

energy thats transfered due to a temp change

how does heat flow

from warmer (higher KE) to colder (lower KE)

what acompanies physical and chemical changes

energy changes

reverse rule

if reaction is exothermic the reverse must be endothermic

in exothermic is change in temp neg or pos

neg bc energy is relseased (losing energy)

is endothermic is change in temp neg or pos

pos bc energy is absorbed (gained)

enthalpy (H)

form of chemical energy (PE), cant be meausred directly

specific heat caoacity ( c )

amount of heat requeired to raise temp by 1*c (j/g*c)

Heat Capacity (C)

meausres how well a substance stores energy

Bomb Calorimeter

used to measure Change in H

Phase Changes

Transition from solid to liquid to gas or from solid to a gas

solidification from a liquid is an example of what type of reaction

exothermic

vaporization from a liquid is an example of what type of reaction

endothermic

Hf

heat of fusion—> heat required to melt a solid

Hv

heat of vaporization—> heat required to convert a liquid into a gas.

Calorimeter

A device used to measure the heat of chemical reactions or physical changes. It helps in determining the heat capacity of substances.