6.1-6.3 Quiz
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If the surroundings is pushing on the system and compressing a piston, the work is …..
Positive
What does an endothermic reaction profile look like?
The products are higher in energy than the reactants
How is the energy between the system and the surrounding connected according to the first law of thermodynamics?
The first law of thermodynamics states that energy cannot be created or lost, only transferred. So energy of the system= - energy of the surroundings. The negative side will go on whatever is LOSING energy
How do you find the activation energy for a reverse reaction?
You do Top of the graph- products
Dissociation; would this be an endothermic or exothermic process?
Breaking up larger compounds into smaller ones This would be endothermic because the system NEEDS energy to break up the compounds so it is absorbing energy
What phase changes are related to exothermic reactions?
Changes that involve combining materials. Freezing Condensation Deposition
When the energy of a system decreases what type of reaction is it?
Exothermic
If an equation is talking about a change in temperature, what are they referencing?
THE SURROUNDINGS
When products are higher than reactants what does that mean about the stability of the products?
The products are less stable
E (subscript a) or activation energy
The energy necessary to start a reaction. They are used to break bonds or IMFs in the reactants.
Electron Affinity; would this be an endothermic or exothermic process?
The amount of energy released when an electron is added(electron on left side of equation) ; Exothermic because energy is being released
If the system is pushing on the surroundings and expanding a piston, the work is …..
Negative
Work
Energy needed to move something against a force. Think about expanding gases pushing on a piston
Universe
System and surroundings together
How do you label the coordinates for an energy profile?
The x axis is reaction coordinate and the y axis is potential energy
Surroundings
everything else around the system
How do you answer the questions that ask for justification and ask you to choose the BEST answer?
Look for causation and not js correlation Also on this quiz look for answers that talk specifically about breaking or forming bonds.
Vaporization vs boiling
Liquid to vapor vs Liquid to gas
Catalysts
Increase reaction rate and are not consumed in the reaction. They also provide lower activation energies.
Words related to exothermic reactions
Exiting Losing Releasing Negative
Sublimation
Solid to gas
Ionization energy; would this be an endothermic or exothermic process?
Energy required to remove an electron(electron on right side of equation) This would be endothermic because the system NEEDS energy so it will be absorbing energy
If you are told to draw a reaction pathway and are given the reactants and the activation energy(ex: reactants- 40 kJ and Ea- 50 kJ), then how do you graph this?
The reactants will be at 40 and the Ea will be at 90 kJ, because you do 40 plus the Ea.
Condensation
Gas to liquid