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Thermal Conductivity
First Law Vocabulary and Concepts
Conservation of Charge
Gen Z Lingo
100

This variable, represented by k, describes a material’s ability to conduct heat

What is thermal conductivity?
100

A process for which Q = 0

adiabatic

100

A neutral cloth is rubbed against a neutral lucite rod. The rod gains 3µC of electrons. What is the charge on the cloth? 

3µC

100

PAW

parents are watching

200

In the formula for heat conduction, this variable represents the thickness of the material.

What is L?

200

W = 0 for this process

isochoric or constant volume

200

Conservation of charge is a demonstration of what other law of conservation?

conservation of mass—electrons HAVE mass and are matter even though they are really tiny.

200

Drip

appearance is impressive and trendy

300

A metal rod with a cross-sectional area of 0.01 m2 and length 0.5m conducts 200 J of heat in 10 seconds. The temperature difference is 50˚C. What is the thermal conductivity?

What is 20 W/m•K?
300

Wof the system is negative for this process

What is an expansion

300

A pot is on a stove. The stove is turned on. You see the burner turning red. What type of energy transfer allows you to see the red burner?

What type of energy transfer heats the pot?

Radiation (see red)

Heat pot (conduction)

300

Say less

I’ve got the point

400

Describe heating by conduction.

Requires contact. Faster particles hit slower particles and make them move faster. Continues until everything is at the same temperature (same average speed)
400

Identify one of the two functions that are not state functions and why they are not state functions 

Q (heating)

W (work)

Not a state function because the value depends on the path (OR because they are processes, not states)

400

A conductor with a charge of +6µC touches a conductor with a charge of -2µC. What is the charge on each after separation?

Both have a charge of +2µC.

400

Tea

gossip

500

This is the unit of heating.

What is the joule (J)?

500

Identify the one of the two state functions you know of and describe why it is state function

internal energy (∆U)

Entropy (S)

The value only depends on the current state and not how the system got to that state

500

A positively charged rod is brought near a neutral conducting sphere without touching it. 

What happens to the charged in the sphere? 

What is this process called? 

What is the final charge on the sphere?

The electrons move toward the positive rod.

The process is called polarization.

The sphere is still neutral.

500

Smurf

Gamer lingo for a player with a high skill set who competes with a player of a low skill set using a new account (or someone else’s account)

My son Trevor playing Fortnite with me