Thermochem Review 1

Temperature is a measure of the...

• total energy in a substance
• total kinetic energy in a substance
• average potential energy in a substance
• average kinetic energy of molecules in a substance

A chemical reaction that releases heat to the surroundings is said to be __________ and has a __________ ΔH at constant pressure.

• endothermic; positive

• endothermic; negative

• exothermic; negative

• exothermic; positive

Over time, the temperature of a glass of cold water will...

• match the temperature of the surrounding environment.

• become colder still, as heat is transferred to the surrounding environment.

• become warmer than the surrounding environment.

• not change temperature.

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

Tags

NGSS.HS-PS1-5

Which state of H₂O  has the greatest entropy?

• Ice
• Water
• Vapor

Which statement is true about the ENTROPY?

• Entropy refers to DISORDER, the unusable energy that escapes a system.
• Entropy refers to the balance of temperature among two or more systems.
• Entropy refers to the average kinetic energy of the molecules.
• Entropy refers to the inability to destroy or create energy. 

Tags

NGSS.HS-PS3-4

In an exothermic reaction, heat is ...

• taken in or absorbed

• given out or released

Tags

NGSS.HS-PS1-4

In an endothermic reaction, heat is ...

• taken in or absorbed

• given out or released

Tags

NGSS.HS-PS1-4

Rank the following samples from greatest kinetic energy of the molecules to least kinetic energy of the molecules:

• A > B > C > D
• B > A > C > D
• B > A > D > C
• D > C > B > A

Tags

NGSS.HS-PS1-5

In which of the following systems is entropy increasing?

• Putting together a puzzle
• Putting books on a shelf
• Breaking a plate
• Filling a jar of salt