Quiz Chem

Name the process, endo or exo, and what letters depict it?

Solid to liquid

Melting

Endo

B to C

Name the process, endo or exo, and what letters depict it?

Liquid to solid

Freezing

Exo

C to B

Name the process, endo or exo, and what letters depict it?

Liquid to gas

Vaporization

Endo

D to E

Name the process, endo or exo, and what letters depict it?

Gas to liquid

Condensation

Exo

E to D

Name the process, endo or exo, and what letters depict it?

solid to gas

Sublimation

endo

A to E

Name the process, endo or exo, and what letters depict it?

Gas to solid

Deposition

Exo

E to A

As a substance goes through section D to E, what happens to the distance between the particles?

gets seperated

As a substance goes through section C to B, what happens in the distance between the particles?

Shortens

Moving from A to E is it an endo or exo thermic reaction?

Exo

Moving from E to A is it exo or endo?

Endo

“Being warmed” letters

A,C,E

What letter represents the melting of the solid?

B

Which letter(s) show a change in potential energy?

B & D

What letter represents condensation?

D

What letter represents crystallization?

B

Calculate the energy (in J) required to melt/freeze 7.93 g of ice at 0 C.

2.65 × 10³ J

What sf do you use for Latent Heat problems?

The grams

Calculate the energy (in kJ) required to vaporize/condense 89 g of water at 100 C

2.0 × 10² kJ

Calculate the amount of heat in calories required to completely vaporize/melt 50 g of oxygen at -183 C.

Q= 3000 cal

Calculate the amount of heat in Calories required to completely condense/vaporize 5.0 g of nitrogen gas at -196 C.

Q = 0.23 Cal

Latent heat of fusion =

Melting/freezing

Latent heat of vaporization =

vaporize/condensation

Latent Heat definition

Energy is not needed to raise the temperature at a certain phase, but able to change to a new phase.

Latent heat of fusion definition

energy required to melt or freeze 1 mol of a substance with no temperature change.

Latent heat of fusion equation

Q=mHfus

Latent heat of vaporization definition

Energy required to vaporize/condense 1 mol of a substance with no temp change.

Latent heat of vaporization equation

Q=mHvap