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Module M

Gas Laws and Thermochemistry

QuestionAnswer
Thermochemistry's definition the study of how energy changes occurs
Chemical Potential Energy's definition the energy stored in chemical bonds
Heat's definition is the energy that transfers from one object to another because of the temperature difference between the objects
System's definition a small segment of the universe we focus in on and part of what makes up the universe
Surroundings' definition is the immediate vicinity outside the system and part of what makes up the universe
Enthalpy's variable symbol H
Enthalpy's definition how heat flows The value of ΔH can be determine by measuring the heat flow of the rxn at constant pressure
Endothermic's definition heat is absorbed by the system from the surroundings
Endo or Exo? Has a positive ΔH endothermic
Endo or Exo? Has a negative ΔH exothermic
Endo or Exo? When the energy is on the reactant's side endothermic
Endo or Exo? When the energy is on the product's side exothermic
Which type of Chemistry equations need Kelvin? 1) Gas Laws 2) Thermochemistry 3) Both of them Gas Laws only.
If the temperature of a gas is 200K and its pressure is 100 kPa, what happens to the temperature if the pressure is changed to 200 kPa and volume is held constant? temperature increases to 400 K
P1V1 = P2V2 or P1/T1 = P2/T2 or V1/T1 = V2/T2 or PV = nRT If the volume of a system is lowered from 2 L to 1 L, what must happen to its pressure of 4 atm if temperature is held constant? pressure increases to 8 atm
P1V1 = P2V2 or P1/T1 = P2/T2 or V1/T1 = V2/T2 or PV = nRT A balloon has a pressure of 3.0 atm when the volume is 2.0L. Which statement best describes what happens to the gas particles in the balloon when the container size decreases to 1.0L if its temp The kinetic energy does not change because there is no change to temperature. The pressure increases to 6 atm
P1V1 = P2V2 or P1/T1 = P2/T2 or V1/T1 = V2/T2 or PV = nRT A balloon has a pressure of 2.0 atm when the temperature is 303K. Which statement best describes what happens to the gas particles in the balloon when the temperature decreases to 273K if its vo The kinetic energy decreases because the temperature went down. The pressure decreases to 1.8atm
Endo or Exo? C₂H₄ → 2C + 2H₂ + 52.3kJ   exothermic
Endo or Exo? BCl₃ + 3H₂O → HBO₃ + 3HCl        ΔH= 112kJ  endothermic
Endo or Exo? temperature is increasing endothermic
Endo or Exo? temperature is decreasing exothermic
Endo or Exo? melted chocolate rehardening exothermic
"Ice, in my room temperature water, melts" is being used as an example of an endothermic reaction. Which item represents the system? ice
Endo or Exo? It is a very hot day. As students enter an air conditioned room, the room temperature rises. The room is the system. endothermic
"The air around a lit candle feels warmer" is being used as an example of an exothermic reaction. Which item represents the system? candle
Endo or Exo? A bottle of water makes my hand feel cold. Hand is the system exothermic
Endo or Exo? Butter melts on a toast. Toast is the system. exothermic
Endo or Exo? Water evaporates into the air on a sunny day. Water is the system. endothermic
Endo or Exo? Condensation exothermic
Endo or Exo? Photosynthesis endothermic
P1V1 = P2V2 or P1/T1 = P2/T2 or V1/T1 = V2/T2 or PV = nRT What is the relationship between P and V if T held constant? Inversely proportional
P1V1 = P2V2 or P1/T1 = P2/T2 or V1/T1 = V2/T2 or PV = nRT What is the relationship between V and T if P held constant? Directly proportional
P1V1 = P2V2 or P1/T1 = P2/T2 or V1/T1 = V2/T2 or PV = nRT If pressure in a gas doubles, what happens to volume? It is cut in half
P1V1 = P2V2 or P1/T1 = P2/T2 or V1/T1 = V2/T2 or PV = nRT If temperature is cut to 1/3, how is volume changed? It is cut to 1/3
P1V1 = P2V2 or P1/T1 = P2/T2 or V1/T1 = V2/T2 or PV = nRT If a balloon is placed in a freezer, what happens to its pressure? It decreases
When using C * m * ΔT = q ΔT must be what kind of value? Absolute or positive
When using C * m * ΔT = q q must be what kind of value? q will be positive if the wording indicates the problem is ENDOTHERMIC (words like absorbed, warmed, gained heat, temperature increased) q will be negative if the wording indicates the problem is EXOTHERMIC (words like released, cooled, lost heat, temp
Created by: erika.johnson
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