Flashcards in 17 - 1 Deck (36):
What is thermochemistry?
The study of heat changes that accompany chemical rxns & physical changes
Sum total of the KE of all particles in a sample of matter
Where does heat flow from?
High concentration to low concentration
What is heat measured with?
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
Measures the average KE of particles in a sample of matter
What unit is tempature in?
What is KE formula?
What is one newton equal to?
What is 1J equal to?
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?
What are the units for Cp?
What substance has the highest specific heat?
What is waters specific heat?
Define heat capacity
The ability of a material to absorb heat
What is one I the specific heat calcs?
Cp=q/(m) TRIANGLE T
What heat of rxn AKA?
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
Heat is released & feels hot
What is TRIANGLE H when exothermic?
Negative as heat is lost
Exothermic reactants have what?
Higher heat content than products
Heat is absorbed
What is TRAINGLE H when endothermic?
Positive as heat is gained
Endothermic products have what?
Higher heat content than reactants
How do you determine endothermic heat?
TRIANGLE H is negative as heat is lost
When TRIANGLE H is a high negative value what's formed & how?
A stable compound
Vigorously & spontaneously
What is released when a product is formed?
What do reactants most commonly do?
When TRIANGLE H is a + or low negative what is true?
Unstable compound may form & may decompose violently