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WorksheetsLMs 49-50 Practice Questions
Total questions: 19
Worksheet time: 38mins
What is the value of w if a system is doing work?
negative
positive
It depends on what kind of work it is doing.
More information is needed.
What is the value of w if work is being done on the system?
negative
positive
It depends on what kind of work it is doing.
More information is needed.
If volume of a gas is decreasing, what is the sign of w?
negative
positive
It depends on what kind of work it is doing.
More information is needed.
If volume of a gas is increasing, what is the sign of w?
negative
positive
It depends on what kind of work it is doing.
More information is needed.
If heat leaves the system, what is the sign of q?
negative
positive
It depends on what kind of work it is doing.
More information is needed.
If the system absorbs heat, what is the sign of q?
negative
positive
It depends on what kind of work it is doing.
More information is needed.
+ΔG
nonspontaneous reaction
−ΔG
spontaneous reaction
+ΔS
more disorder
−ΔS
less disorder
+w
work done on the system
+ΔH
endothermic reaction
−ΔH
exothermic reaction
+q
heat added to the system
-w
work done by the system
-q
heat released by the system
The 1st law of Thermodynamics
Energy can not be created or destroyed. It just changes forms.
Energy can only be created by the sun
Some energy is lost to the environment.
1200 J of heat are added to a sample of gas while 400 J of work is done by the gas. What is the change in internal energy of the gas?
800 J
1600 J
-800 J
-1600 J
An ice cube tray is removed from a freezer. What happens to the ice?
The ice melts because thermal energy flows into it from the surroundings.
The ice melts because it loses thermal energy into the surroundings.
The ice melts because it no longer has energy from the freezer.
The ice does not melt.
Objects that change temperature slowly have …
high specific heat capacity
low specific heat capacity
high internal energy
low internal energy
Which of the following is/are statements of the 1st Law of Thermodynamics?
ΔE = q + w
Heat and work are forms of energy
Energy cannot be created nor destroyed, it can only be transformed.
Total energy is always zero.
What does ΔE stand for in the equation, ΔE = q + w ?
Change in Entropy
Change in Element
Change in Internal Energy
Change in Free Energy
A gas absorbs 500 J of heat and does 200 J of work. What is the change in internal energy of the gas?
+ 700 J
-700 J
- 300 J
+ 300 J
1. The temperature increases when calcium chloride dissolves in water.
2. Steam condenses to liquid water
3. Water boils
4. Dry ice sublimates
If a substance is changing from a solid to a liquid, what are the signs for ΔH and ΔS ?
-, +
-, -
+. -
+, +
