Unit 5 Standards Review

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Kinetics and Thermochemistry




  1. Students know how to describe temperature and heat flow in terms of the motion of molecules (or atoms).

    • Heat flows from a material at temperature to a material at temperature.
    • Temperature is related to energy, the energy of motion.

  2. Students know chemical processes can either release () or absorb () thermal energy.

    • In exothermic processes, the energy content of the reactants is than the energy content of the products.
    • In endothermic processes, the energy content of the reactants is than the energy content of the products.

  3. Students know energy is when a material condenses or freezes and is when a material evaporates or melts.
  4. Students know how to solve problems involving heat flow and temperature changes, using known values of specific heat and latent heat of phase change.

    • The formula for calculating heat () or specific heat (p) are on the back of the CA CST periodic table.
    • has an exceptionally high specific heat
    • have a characteristically low specific heat
    • The values for the latent heat of (ΔHvap) and the latent heat of fusion (ΔHfus) are on the back of the CA CST periodic table.


  5. Students know the rate of reaction is the decrease in concentration of or the increase in concentration of with time.
  6. Students know how reaction rates depend on such factors as concentration, temperature, and pressure.

    • As the temperature increases, the rate of a chemical reaction ALWAYS .

  7. Students know the role a catalyst plays in increasing the reaction rate.

    • Catalysts are substances that a reaction by activation energy.

  8. Students know how to use LeChatelier’s principle to predict the effect of changes in concentration, temperature, and pressure.

    • When a closed system at equilibrium if placed under , the system will undergo a in such a way as to relieve the stress.

  9. Students know equilibrium is established when forward and reverse reaction rates are .