What is the pH of a 7.8 x 10-2 M KOH solution?

Write and balance equations include phase symbols:   The reaction of iron with oxygen gas to form solid iron(III) oxide.

Write and balance equations for: The reaction of elemental copper with chlorine gas to form copper(II) chloride

Why do certain solutions mix and others do not? What causes some to float and others to sink? 

Consider the reaction below:        4Fe + 3O2 –> 2Fe2O3   If 44.2 grams of oxygen react with an excess of iron, what mass of Fe2O3 can form?  (Fe2O3= 159.70 g/mol)

Normal average normal body temperature is 98.6 oC.  Three children have their temperature taken at a doctor’s office.  The first child has a temperature of 310 K.  The second child has a body temperature of 98.5 oC.  The third child has a body temperature of 38.3 oC.  Which child is running a fever (has a temperature greater than 100oF)?

Consider the following net ionic equation:  Mg + Fe2+ –> Mg2+ + Fe the species reduced is ___ and the species oxidized is ____

In this reaction, the excess reagent is ___. 2Al + 5Br2  –> 2AlBr3   +  2Br2  

The empirical formula for aluminum oxide is ___.  Make sure to leave no spaces.

When heated, zinc and sulfur combine to form a new compound, zinc sulfide, ZnS.  In this reaction,