Energy and Heat
_____ is energy that is transferred from one object to another because of a difference in their temperatures
Heat
___________ is the study of heat transfer.
Thermochemistry
What is one example of a spontaneous reaction?
wet clothes dry when hung outside, alka-seltzer tablet dissolves and produces bubbles, a drop of food coloring in water spreads throughout, ice melting at room temp, or a cup of coffee cooling down when left out.
Enthalpy is a measure of the energy content of a system, symbolized by _
H
The temperature of an object is proportional to the average ______ ______ of its atoms or molecules.
kinetic energy
True or False: We can use thermochemistry to make jet fuel
true
What term is symbolized by S
Entropy
True or False: Enthalpy is a concept used in refrigerators
true
Heat is an _______ property, while temperature is is an ________ property.
extensive; intensive
_____________ is the study of energy changes as they relate to macroscopic quantities like pressure, volume, temp, and enthalpy.
THERMODYNAMICS
Are spontaneous reactions endothermic or exothermic?
both
What instrument do scientists use to measure heat
calorimeter
Who discovered thermochemistry?
Germain Henri Hess
Joseph Black
Antoine Lavoisier
Germain Henri Hess
Spontaneous Reactions are those that can occur under specific conditions without any ______.
assistance
Who invented enthalpy?
Coyer Robinson
Heike Kamerlingh Onnes
Carter Radig
Heike Kamerlingh Onnes
You need to know its specific heat, its mass, and the temperature change to evaluate heat transfer. What can this be simplified to?
delta
heat produced in a reaction ______ heat absorbed in the reverse reaction.
equals
What are two examples of entropy change
solid ->liquid, liquid->gas, solute dissolving in a solvent, or heating a system
What has to be constant for a process to occur when the enthalpy change is a measure of the heat change accompanying the process?
pressure