Which of the following is not an example of evaluation criteria?

Identify the oxidation-reduction reactions among the following: Zn (s) + Cu2+ (aq)  →  Zn2+ (aq) + Cu (s) 2 Na (s) + Cl2 (aq)  →  2 NaCl (s) 2 Mg (s) + O2 (g)  →  2 MgO (s)

Select the answer in which this equation is properly balanced: C₂H₆ + O₂ → CO₂ + H₂O

Which of the following symbols represent a potassium ion with 18 electrons?

Leachate collection is no longer required in the state of Florida as of 2010.

Select the answer in which this equation is properly balanced:  __ KOH + __ H₃PO₄ → __ K₃PO₄ + __ H₂O

Solve the following problem, and select the correctly rounded answer choice:  339.41 + 4.369 = (Select the BEST answer choice)

All elements have four or more naturally occurring isotopes. 

Select the answer in which this equation is properly balanced: __ FeS + __ O₂ → __ Fe₂O₃ + __ SO₂

When fuel is burned in oxygen, the products are carbon dioxide and water. If 12 grams of water and grams of carbon dioxide are produced from grams of oxygen, how many grams of fuel must have burned?