CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND
ANSWERS UPDATED .Buy Quality Materials!
Energy
The ability to do work or transfer heat
Thermochemistry
The study of chemical reactions and the energy changes that involve heat
Chemical energy is mainly...
potential energy
1J=
1 kg·m2/s2
1 kg·m2/s2 =
1J
Energy is ___ when chemical bonds are formed
released
Energy is ___ when chemical bonds are broken.
consumed
Ions want to be in a ___ potential energy state.
low
Whats the first law of thermodyanmics?
Energy can be converted, but never created or destroyed.
What does 'the system' reffer to?
The portion of the universe that we single out to study. The surroundings are everything
else.
The internal energy (E) of a system is ...
The sum of all kinetic and potential energies of all components of the system.
What is the formula for change in engery?
Δ𝐸 = 𝐸𝑓𝑖𝑛𝑎𝑙 − 𝐸𝑖𝑛𝑖𝑡𝑖𝑎𝑙
When energy is exchanged between the system and the surroundings, it is
exchanged as ...
either heat (q) or work (w).
What is the chnage of engery formula that uses heat and work?
Δ𝐸 = 𝑞 + 𝑤
Describe endothermic reactions
Heat is absorbed in the reaction
Describe exothermic reactions
Heat is released in the reaction
State function
a property of a system that is determined by specifying the system's condition or state
What does the value of a state function depend on?
The present state of the system, not the path it took to get there.
Is energy a state function?
Yes
Are work and heat state function?
ANSWERS UPDATED .Buy Quality Materials!
Energy
The ability to do work or transfer heat
Thermochemistry
The study of chemical reactions and the energy changes that involve heat
Chemical energy is mainly...
potential energy
1J=
1 kg·m2/s2
1 kg·m2/s2 =
1J
Energy is ___ when chemical bonds are formed
released
Energy is ___ when chemical bonds are broken.
consumed
Ions want to be in a ___ potential energy state.
low
Whats the first law of thermodyanmics?
Energy can be converted, but never created or destroyed.
What does 'the system' reffer to?
The portion of the universe that we single out to study. The surroundings are everything
else.
The internal energy (E) of a system is ...
The sum of all kinetic and potential energies of all components of the system.
What is the formula for change in engery?
Δ𝐸 = 𝐸𝑓𝑖𝑛𝑎𝑙 − 𝐸𝑖𝑛𝑖𝑡𝑖𝑎𝑙
When energy is exchanged between the system and the surroundings, it is
exchanged as ...
either heat (q) or work (w).
What is the chnage of engery formula that uses heat and work?
Δ𝐸 = 𝑞 + 𝑤
Describe endothermic reactions
Heat is absorbed in the reaction
Describe exothermic reactions
Heat is released in the reaction
State function
a property of a system that is determined by specifying the system's condition or state
What does the value of a state function depend on?
The present state of the system, not the path it took to get there.
Is energy a state function?
Yes
Are work and heat state function?
