Aphosphorus molecule containing 4 atoms of phosphorus bonds with a molecule containing 8 sulfur atoms to form diphosphorus pentasulfide

what’s the balanced equation?

4 P4 + 5 S8 => 8 P2S5

Explanation: The intial equation is

P4 + S8 => P2S5

To balance the equation we put a coefficient of 8 to P2S5 so the number of atoms for S and P are:

Reactants Products

P - 4 8 x 2 = 16

S - 8 8 x 5 = 40

To balance the reactant side we will multiply P by 4 and S by 5

Reactants Products

P - 4 x 4 = 16 2 x 8 = 16

S - 8 x 5 = 40 5 x 8 = 40

So the equation is now balanced.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

c. orbital shape i hope this is correct