Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chapter 5- Thermo


Work energy used to cause an object that has mass to move W=Fd W=-PdeltaV ( - when system does work) units = J (kgm^2s^-2) F- force = ma d- distance
Heat Energy to cause an object to increase in kinetic energy (differences in temperature) energy is transferred from a hotter object to a colder one this system can exchange energy with its surroundings in the form of work and heat but cant exchange matter
Potential Energy Arises when a force is operating on an object energy being stored ie. Gravity
Kinetic energy energy of motion depends on mass and speed of the object Ek=1/2 mv^2 Atoms and molecules have mass and are in motion they pass kinetic energy. Directly related to T
Lattice Energy proportional to the changes on the ions and inversely proportional to the distance separating them in crystal.
Open system Matter and energy can be exchanged with the surroundings ie boiling water
Closed system exchange of energy can happy with matter but not with the surroundings This system can exchange energy with its surroundings in the form of work and heat but can not exchange matter
Isolated system a system in which neither energy nor energy can be exchanged with the surroundings
First Law of thermodynamics energy can neither be created nor destroyed. Energy is conserved. Energy is lost by a system but gained by the surroundings
Internal energy the internal energy of a system is the sum of all kinetic and potential energies of all its components Efinal-Einitial
State function a property of a system that is determined by specifying its state(P, T) The value depends only on the present state.
Endothermic A system absorbs heat ( heat entering the system)
Exothermic A system gives off heat (heat flows out of the system)
INternal energy delta E depends only on the initial and final states delta E= q+w delta E=q+(-Pdelta V)
delta E=q+(-Pdelta V) if the V doesn't change w =0 so delta E=q with a constant volume. The change in internal energy measures the heat gain or loss at constant volume
Enthalpy delta H= delta E + PV process taking place at a constant P and the only work done is the P-V work, the heat flow during the process is called enthalpy . If presure is constant than delta H= q
Enthalpy sign convention H>0 ENDOTHERMIC (+) H<0 EXOTHERMIC (-) q>0 system GAINS heat (+) q<0 system LOSES heat (-) w>0 work done ON system (+) w<0 work done BY system (-) E>0 NET GAIN of energy (+) E<0 NET LOSS of energy (-)
Calorimetry heat flow can be determined by measuring temperature change.
Heat capacity and specific heat Q=mc delta T the heat capacity for 1 mole of a substance is called the molar heat capacity the heat capacity for 1 g of a substance is called the specific heat capacity
Created by: labe