First semester Final Exam

Link to key concepts - use these review our models

Chem review - practice final click here for answers

Use our models to analyze reactions.  Interactive practice below - watch video and test yourself.

PLUS Additional practice with magnesium reacting with oxygen click here for blank and here for key.  You can watch the video here.

More practice with sodium reacting with water.  Click here for the blank and key.  You can watch the video here.  or here

FALL 2011 FINAL EXAM -  Practice with the blank and the key

INTERACTIVE PRACTICE.  Solid sodium reacts with chlorine gas to form solid sodium chloride.  Analysis of the reaction.

Watch the reaction by clicking here.  or here or here

DESCRIBE THE REACTANTS AND PRODUCTS. You will need to answer these three questions for the reactants and products: What kind of particles? What attractions? What arrangement of particles?

SODIUM SOLID.   What kind of particles: atoms, ions, or molecules?  What kind of bonds?  Describe the arrangement of particles?  click for answers

CHLORINE GAS.  What kind of particles: atoms, ions, or molecules? What kind of bonds? Describe the arrangement of particles?  click for answers

SODIUM CHLORIDE SOLID.  What kind of particles: atoms, ions, or molecules? What kind of bonds? Describe the arrangement of particles?  click for answers

DESCRIBE THE CHANGES.

What happened to the sodium?  Consider what it was like in the beginning and in the end?  Was it oxidized or reduced?  Write a half reaction.  click for answers

What happened to the chlorine? Consider what it was like in the beginning and in the end?   Was it oxidized or reduced? Write a half reaction.  click for answers

 ENTHALPY.  The reaction produces bright light and a great deal of heat.  Is the reaction endothermic or exothermic?  Describe the direction of energy transfer to justify.  Does nethalpy increase or decrease?  Is the reaction favored based on enthalpy?  Justify.  Describe the reaction in terms of the energy invovled in breaking and forming attractions. Sketch and label the graph.

ENTROPY.  Does the entropy increase or decrease?  Justify.   Be sure you defined entropy and addressed the particles possible motions.   Is the reaction favored based on entropy?  Click here for answers.

Click here for an animation