Review Thermodynamics

The type of heat transfer that happens through direct contact of molecules or particles with each other is ___________________.

• Convection
• Conduction
• Radiation
• insulation.

Which statement is true?

• The quicker a molecule moves, the colder it is.
• The slower a molecule moves, the warmer it is.
• The quicker a molecule moves, the warmer it is
• The movement on molecule don�t affect its temperature

Tags

NGSS.HS-PS3-2

Two objects at different temperatures are in contact. Which of the following happens to their thermal energy?

• Their thermal energies remain the same.
• Thermal energy passes from the cooler object to the warmer object
• Thermal energy passes from the warmer object to the cooler object.
• Thermal energy passes back and forth equally between the two objects.

Tags

NGSS.HS-PS3-4

When the temperature of matter increases the particles...

• speed up and move closer
• speed up and move farther apart
• slow down and move closer together
• slow down and move farther apart

Tags

NGSS.HS-PS3-2

Which of the following changes increases the entropy ?

• evaporation of water

• freezing of water

• condensation of water

Which one of these would result in a decrease in entropy?

• A solid solute dissolves in water.
• A gas is released.
• A liquid freezes.
• A liquid boils.

Entropy always increases when

• enthalpy decreases.
• temperature decreases.
• temperature increases.
• volume increases.

Which process is accompanied by a decrease in entropy?

• boiling of water

• condensing of water vapor

• subliming of iodine

• melting of ice

The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0 °C to 35.0 °C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal?

• 1.17 J/g°C
• -1.17 J/g°C
• 0.857 J/g°C
• -0.857 J/g°C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

A sample of iron receives 125J of heat energy that raises the temperature of the iron 32.0°C. What is the mass of the iron sample?

• 8.70g

• 14.4 g

• 20 g

• 50 g

Tags

NGSS.HS-PS3-1