Untitled Flashcards Set

★Convert from one unit of energy to another using dimensional analysis.

• Given: 1 cal = 4.184 J, 1000 cal = 1 kcal = 1 Cal, 1000 J = 1 kJ

Define and contrast the concepts of thermal energy, heat, and temperature.

Convert between degrees Celsius and Kelvin

• Given: K = °C + 273.15

Describe the state of two substances at thermal equilibrium.

Define and interpret the specific heat capacity(c) of a substance. 

• Units: J/g°C

★Use q=mcΔT to solve for an unknown variable.

• heat(q) = m(mass) c(specific heat capacity) ΔT(change in temperature)

  • ΔT = T_Final-T_initial

• Use this equation ONLY when there is a change in temperature.

• You will always be given c, unless you are being asked to solve for it.

★Perform basic calorimetry problems using -mcΔT = mcΔT

• Use this equation only when two substances are transferring energy between one another (Make a table for your data!).

• Remember: the substance losing energy needs the negative sign in front

Draw and interpret a heating/cooling curve.

• Students are recommended to draw a heating curve whenever possible to ensure problems are being solved correctly

★Use the latent heat of fusion and the latent heat of vaporization to calculate changes in energy due to changes in states of matter (dimensional analysis)

• You will be given H_fus and H_vap

Describe the role breaking and forming bonds has in overall enthalpy change for a reaction

• Breaking Bonds absorbs energy

• Forming Bonds releases energy

★Calculate and interpret enthalpy of reaction (ΔH).

• Given: ΔH = ΣΔH_{Bonds Breaking}-ΣΔH_{Bonds Forming}

• Units: kJ/mol

• You will given average bond energies, 

• You will need to be able to draw Lewis structures (chapter 5)

Classify processes as endothermic or exothermic

• Endo: energy into, +ΔH

• Exo: energy exits, -ΔH

Draw and interpret reaction energy diagrams

• Label activation energy(E_A), transition state, ΔH_reaction, axes