Unit 6 review

Unit 6: Thermodynamics
- Endo and Exothermic processes, Enthalpy, concept concerning phase changes, etc

6.5: Energy of phase changes
6.6: Intro to enthalpy of reaction
6.7: Bond enthalpies
6.8: Enthalpy of formation
6.9: Hess's Law

6.1: Endo & Exothermic processes
6.2: Energy Diagrams
6.3: Heat transfer and thermal equilibrium
6.4: Heat capacity and calorimetry

This Quizzizz will consist of information from each chapter in Unit 6.

Multiple Choice

What is the least accurate way to calculate 𝚫H?

• Calorimetry (q = mc𝚫T)

• Using Hess's Law

• Using Bond enthalpies

• Using enthalpies of formation

Multiple Choice

(6.5) What is D-E?

• 𝚫Hfus, endothermic, negative value

• 𝚫Hvap, exothermic, positive value

• 𝚫Hfus, endothermic, positive value

• 𝚫Hvap, endothermic, positive value

Multiple Choice

(6.4) What is the forumla for Molar Heat Capacity (Cm)?

• q = mc𝚫T

• q = nCm𝚫T

• 𝚫Hsub = 𝚫Hfus + 𝚫Hvap

• 𝚫Gº = 𝚫Hº - T𝚫Sº

Multiple Select

A sample with a large specific heat capacity means... (Select all that apply)

• It takes a large amount of energy to increase the temperature

• It takes less time to increase the temperature

• Retains heat longer

Fill in the Blanks

Multiple Choice

Which is the correct formula for the most accurate way of calculating 𝚫H?

• ΔH =
  ΣBE_{(bonds broken)} - ΣBE_{(bonds formed)}

• ΔHºrxn=
  ∑ΔHºf(products)−
  ∑ΔHºf(Reactants)

• q = mcΔT

Fill in the Blanks

Multiple Choice

Which of these the definition for Hess's Law?

• All energy in chemical and physical is conserved

• An equilibrium system will shift to reduce pressure

• The enthalpy change is equal to the sum of the enthalpy changes for each step

• The distribution of kinetics energies increases as temperature increases

Poll

Do you feel confident for the AP exam? Be honest.

• Yes!

• Kinda...

• No. I am beyond cooked. thx for asking!