41 questions
What is the definition of "entropy"??
enthalpy
heat content
disorder
activation energy
Which phase of matter has the least entropy?
solid
liquid
gas
plasma
What phase of matter has the most entropy?
solid
liquid
gas
Which involves an increase in entropy? (if needed, select more than one answer)
spraying an air freshener
picking up apples off the ground
dropping an egg on the floor
arranging a deck of cards by suit
Which involves a decrease in entropy? (if needed, select more than one answer)
condensation
melting
sublimation
freezing
At what temperature would the reaction of vinegar and baking soda occur the fastest?
0oC
50oC
75oC
120oC
Why does a thermometer display a high temperature with hot coffee?
the molecules are moving slowly & have many collisions with the thermometer
the molecules are moving slowly & have few collisions with the thermometer
the molecules are moving quickly & have many collisions with the thermometer
Which number represents condensation?
1
2
3
4
Which number represents melting?
1
2
3
4
Which represents the LIQUID phase?
A
B
C
Which number best represents the point where solid, liquid, & gas coexist in equilibrium?
1
2
3
4
The change in phase represented from point A to point B is...
boiling
melting
condensation
sublimation
The change in phase represented from point A to point B is...
melting
freezing
condensation
boiling
sublimation
The change in phase represented from point A to point B is...
condensation
boiling
sublimation
deposition
melting
From point M to point N at constant pressure, how many phase changes are occurring?
one phase change
two phase changes
three phase changes
no phase change occurs
Which segment best represents the warming of a solid?
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
Which segment best represents the warming of a gas?
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
Which segment best represents boiling?
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
Which segment best represents melting?
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
Which segment best represents warming of a liquid?
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
the energy required to change phase from solid to liquid
heat of vaporization
heat of fusion
the energy required to change phase from liquid to gas
heat of vaporization
heat of fusion
Temperature does NOT change during a phase change.
True
False
The graph best describes...
endothermic reactions
exothermic reactions
The graph best describes...
endothermic reactions
exothermic reactions
This energy curve is best described as an...
endothermic reaction
exothermic reaction
This energy curve is best described as an...
endothermic reaction
exothermic reaction
heat + reactants --> products
endothermic reaction
exothermic reaction
reactants --> products + heat
endothermic reaction
exothermic reaction
"The energy required to start a reaction."
Activation energy
Catalyst
Enthalpy
Temperature
"Speeds up a reaction by lowering activation energy."
Entropy
Catalyst
Enthalpy
Temperature
Which best represents the activation energy of this exothermic energy curve?
A
B
C
D
Which number best represents the impact of a catalyst on the energy curve of an exothermic reaction?
1
2
3
4
If the change in enthalpy is positive:
then the reaction is...
endothermic
exothermic
If the change in enthalpy is negative:
then the reaction is...
endothermic
exothermic
Enthalpy is defined as...
disorder
scattering
heat content
a catalyst
Which color arrow represents the activation energy after a catalyst has been added to the reaction?
red
green
What temperature is absolute zero? You might need to select more than one correct answer.
0 Kelvin
-273 oC
-273 Kelvin
0 oF
What happens at absolute zero?
All molecular motion stops.
Molecular motion is at its highest.
Kinetic energy is at its highest.
Phase change from liquid to solid.
We will not be able to reach absolute zero.
True
False
All reactions have an activation energy.
True
False