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Chemical Reactions Practice Test

  1. Ionic Bonds (PS2D-a)
    1. How does an atom become an ion?  






    2. In the space below use Lewis diagrams to show how a Lithium and Chlorine atom form an ionic bond.  
       










  2. Chemical Formulas (PS2D-b)
    1. What are the element names and how many atoms of each element are in the compound Li2O? 




    2. Is Li2O an ionic or covalent compound? Explain your reasoning.  




  3. Covalent Bonds and formulas(PS2E-ab)
    1. Circle the molecule in the following list:         NaCl             Ca             neutron             H2O


       
    2. Explain the role of electrons in how covalent bonds hold molecules together. 




  4. Large Carbon Molecules (PS2F)

    Draw the structural formula for this molecular formula:     C2H4


     
     
     
     
     
     
     
  5. Important Chemical Reactions (PS2G-a)

    Choose one of the following chemical reactions:     Photosynthesis         Cellular respiration         Combustion

    1. Describe the chemical reaction including all compounds involved.  






    2. Why the reaction is important to humans?  






  6. Writing Chemical Formulas (PS2G-b)
    1. Write a chemical equation showing how atoms in molecules are arranged before and after a reaction. You can use any of the reactions you've learned this semester (except the one in the question below). This equation need not be balanced.  
       
       
       
       
       
  7. Balancing Chemical Formulas (PS2G-b2)
    1. Balance the following chemical equation:       ____ Mg + ____ O 2 → ____ MgO
  8. Exothermic Reactions (PS2G-c)
    1. Give an example of an endothermic OR exothermic reaction. Tell me which one you chose. If you say 'hot pack' or 'cold pack' identify the materials in the packs.  
       




    2. Contrast endothermic and exothermic reactions.  






  9. Physical/Chemical Processes (PS2H-a)

    Identify the following processes as a physical or chemical change by completing the table below. Justify your choice by describing what happens to the atoms during the process.

    Process Physical or Chemical Change? Explain your choice
    Reacting
     
     
    Dissolving
     
     
    Melting
     
     
  10. Common Solutions (PS2H-b)

    Give an example of a common solution with its solvent and solute

    Solution Solvent Solute

     

  11. Physical/Chemical Process Rates (PS2I)

    For each change below identify whether the rate would increase, decrease or stay the same.

    Change made to the chemical reaction Rate change?
    Temperature is decreased
    Concentration is increased
    Surface area is increased