17 - 1 Flashcards
(36 cards)
Define heat
Sum total of the KE of all particles in a sample of matter
What is thermochemistry?
The study of heat changes that accompany chemical rxns & physical changes
Where does heat flow from?
High concentration to low concentration
What is heat measured with?
Calorimeter
What is a calorimeter?
Contains water in an insulated vessel
Where does a rxn occur?
In a known mass of H2O
Heat absorbed or released by H2O is equal to what?
That absorbed OR released by a rxn
Define tempature?
Measures the average KE of particles in a sample of matter
What unit is tempature in?
Joules
What is KE formula?
1J=(n)(m)
What is one newton equal to?
1N=(kg)(m)/sec^2
What is 1J equal to?
(Kj)(m^2)/sec^2
Define specific heat
Amount of heat beg required to raise T of a substance by 1 degree Celsius or kelvin
What is the symbol for specific heat?
Cp
What are the units for Cp?
Joules/(g)(k)
What substance has the highest specific heat?
Water
What is waters specific heat?
4.18 joules/(g)(k)
Define heat capacity
The ability of a material to absorb heat
What is one I the specific heat calcs?
Cp=q/(m) TRIANGLE T
q=
(Cp)(m)(TRIANGLE T)
Triangle T=
Q/m•Cp
What heat of rxn AKA?
Enthalpy
Define heat of rxn
Amount of heat absorbed or released in a chem rxn
Heat of rxn is the difference…
In heat between the stored nrg of the reactions & that of the products
