Endo and Exo Changes

Question 1

Physical Changes

Answer 1

• Trama
• dissolving = dissolution
• phase/state change

Question 2

S–> L

Answer 2

Fusion/Melting (endo)

Question 3

L–>G

Answer 3

vaporization/boiling (endo)

Question 4

S–>G

Answer 4

sublimation (endo)

Question 5

G–>L

Answer 5

condensation (exo)

Question 6

L–>S

Answer 6

Freezing/solidification (exo)

Question 7

G–>S

Answer 7

deposition (exo)

Question 8

EXO chemical reactions

Answer 8

Ax2 B Cx2 D F
- Acid dissolving in water
- Acid base neutralization
- Base dissolving in water
- Combustion (burning)
- Composition
- Digestion
- Fermentation

Question 9

Endo reaction definiton

Answer 9

The temp. of the suroundings decreases because HE is absorbed by the system

Question 10

Thermochemical Equation for Endo

Answer 10

HE + A + B –> AB

Question 11

Delta H notation Endo

Answer 11

A + B –> AB ΔH= +KJ

Question 12

activation energy

Answer 12

minimum amount of E needed to activate reactants into products (energy put into system)

Question 13

enthalpy

Answer 13

measure of heat in a thermochemical system

Question 14

Exo reaction definition

Answer 14

The temp. of the surroundings increases because HE is absorbing heat by the system

Question 15

Thermochemical Equation for Exo

Answer 15

A + B –> AB + HE

Question 16

Delta H notation Exo

Answer 16

A + B –> AB ΔH= - KJ