chemical reactions 2

what determines the state of matter

its internal heat (enthlapy)

what 4 things can states of matter be described by

pressure volume temprature and amount

whats an endothermic reaction

energy is used

whats an exothermic reaction

energy is released

which of the transitions between states of matter are endothermic reations

vaporisation, melting, sublimations

which of the phase transitions between states of matter is exothermic

condensation, freezing, deposition

define enthlapy

baisicly just the toatal heat content of a system

whats the first law of thermodynamics

energy cant come out of nowhere

describe the first law of thermodynalics in relation to heat

matter has energy content (enthlapy), heat is equivilent to mechanical enegy

whats the equation linking the ways that energy content can be described

Pv/Tn=K=R

What is R in this equation

the universal gas constant

what is hess’s law

the enthlapy of a reaction is equal to the sum of the enthlapies of the reactions into which it may be divided - the enthlapy is individual of the route taken