Thermodynamics

Which is the heat energy needed to evaporate 1kg of a substance?

• latent heat of fusion
• latent heat of vaporization
• melting point
• specific heat capacity

What is heat?

• the amount of thermal energy in an object
• an object's internal kinetic energy
• the thermal energy transferred from one object to another
• the amount of energy needed to raise the temp of an object

The average kinetic energy of the atoms or molecules in a substance

• heat
• specific heat capacity
• temperature
• Brownian Motion

Heat can travel through empty space using this method of transfer.

• Conduction
• Convection
• Radiation
• this is impossible

In this method of heat transfer heat is carried by a moving medium, like water or air.

• Conduction
• Convection
• Radiation
• this is impossible

Tags

NGSS.HS-ESS2-3

Which method of heat transfer uses direct contact between molecules?

• Conduction
• Convection
• Radiation
• this is impossible

What is the equation for the heat gained if an object changes from liquid to solid?

• Q=mcΔT
• Q=mlf
• Q=mlv
• Qhot=Qcold

If a pot of hot water is heated but the temperature doesn't change, what must be happening?

• the water melts
• the water freezes
• the water evaporates
• the water condences

Does it require more energy to heat an object with a high specific heat or a low specific heat?

• high
• low

When heat is added or removed from a substance does its temperature always change? 

• yes, temperature changes any time heat is added
• no, temperature only changes at the melting or boiling point
• no, when changing state temperature stays constant