Class Rubric

 

The following point system for a grading rubric employs the traditional low points for memory work and progressively higher points when the student must draw upon memory and analytical thinking. 

 

1 Point

     The student should be able to identify, state the meaning of,  and/or use symbols in writing equations.  The symbols should include:  arrows, reversible arrows, (s), (g), (l), (aq), and symbols for catalyst, and heat.

 

2 Point

 

     Given a chemical reaction write the reaction as a sentence.

Example:   Zn(s)  +  2HCl(aq)   Þ  ZnCl2(aq)    +  H2(g)

 

        Solid zinc metal reacts with an aqueous solution of hydrochloric acid to produce an aqueous solution of zinc chloride and hydrogen gas.

 

2 Point

     Given reactants and products, balance a chemical reaction.

Example: Balance   H3PO4 (aq)   +  Ca(OH)2   Þ  Ca3(PO4)2(aq)  +   H2O(l)

 

2 Point

 

Given an equation, identify the type of reaction as combination, decomposition, single replacement, double replacement, or combustion.

 

Example:  Identify the type of equation for each of the above equations.

   Zinc plus hydrochloric acid is a single replacement.

   Phosphoric acid reacting with calcium hydroxide is a double replacement

 

3Point

 

     Given the reactants, predict the products using correct subscripts.

Example: Predict the products of the following:

 

     Cl2(l)   +   KI(aq)   Þ

     BaCl2(aq)   +   K2CO3 (aq) Þ

    CH4(g)   +   O2(g)     Þ

   

3Point

     Given an equation as a sentence, write the equation using symbols.