Name:

Chemical Behavior Test

  1. Covalent Bonds (PS2E-a) I can give examples to illustrate that molecules are groups of two or more atoms bonded together.
    Directions: Place these twelve items in the appropriate category.
    N He CH4 kool-aid
    electron creamy peanut butter ice cubes your shirt
    AgCl2 Na crunchy peanut butter K+

    Atom Molecule Homogeneous mixtures Heterogeneous mixtures None of these
     
     
     
     
     
     
     
     
     
     
           

  2. Covalent Formulas (PS2E-b) I can explain in words the meaning of a chemical formula for a molecule by identifying the element, how many atoms of each element there are and the nature of their bonds.
    1. NaCl
    2. CaF2
    3. CH4
    4. C6H12O6
  3. Large Carbon Molecules (PS2F) I can demonstrate how carbon atoms form four covalent bonds to make large molecules.
    Directions: Draw the structural formula for these molecular formulas:
    1. CH4
       
    2. C2H6
       
    3. C2H4
       
     
  4. Important Chemical Reactions (PS2G-a) I can describe at least three chemical reactions of importance to humans.
    Directions: Write the chemical reactions including why each reaction is important. Identify the reactants and products.
    1. Equation:
      Reason:
       
    2. Equation:
       Reason:
       
    3. Equation:
       Reason:
       
  5. Writing Chemical Formulas (PS2G-b) I can write a balanced chemical equation to show how atoms in molecules are arranged before and after a reaction.
    1. Hydrogen peroxide (H2O2) decomposes into water and oxygen gas (O2).
       
    2. Magnesium combines with oxygen gas (O2) to form magnesium oxide.
       
    3. Carbon burns with oxygen gas (O2) to form carbon dioxide.
       
    4. Zinc II and hydrochloric acid (HCl) produces hydrogen gas (H2) and zinc chloride.
  6. Exothermic Reactions (PS2G-c) I can give examples of chemical reactions that release energy.
    1. Explain the difference between endothermic and exothermic chemical reactions.
       
    2. Give an example of an exothermic response.
       
    3. Give an example of an endothermic response.
       
     
  7. Physical/Chemical Processes (PS2H-a) I can explain the differences among the processes of dissolving, melting, and reacting.
    Directions:

    Salt (NaCl) is a substance found in food. Explain the differences among the following processes. In your explanation, be sure to describe what is happening to salt molecules during each process.

    • Salt chemically reacting with another substance.
       
    • Salt melting in a pot on the stove.
       
    • Salt dissolving in water.
       
  8. Common Solutions (PS2H-b) I can give examples of common solutions.
    Directions: In each of these identify the solution name, solvent and solute:
    Solution sugar water
    carbonated water    
     
    solvent  
     
      iron
    solute
         
     
    carbon

  9. Physical/Chemical Process Rates (PS2I) I can predict the effect on the rate of a physical or chemical change when: The temperature changes; The surface area changes; The pressure changes.

    Directions: Complete the following chart by predicting what will happen to the rate of the chemical reaction when changes are made to the reaction conditions. In the blanks provided, write whether the rate would increase, decrease or stay the same.
    Change made to the chemical reaction The rate will Increase, Decrease or Stay the Same?
    Temperature is increased  
     
    Concentration is decreased  
     
    Surface area is increased  
     
    A catalyst is used