1. How many moles of Na₂S will be required to completely react with 40.0 mL of 0.200 M Fe(NO₃)₃?
3 Na₂S (aq) + 2 Fe(NO₃)₃ (aq) → Fe₂S₃ (s) + 6 NaNO₃ (aq)

2. How many moles of a precipitate is formed when 25.0 mL of 1.00 M FeCl₃ reacts with 25.0 mL of 1.50 M AgNO₃ in the following chemical reaction?
FeCl₃ (aq) + 3 AgNO₃ (aq) → 3 AgCl (s) + Fe(NO₃)₃ (aq)

answer: they produce more slow than unicellular organisms.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.