PbS + 2PbO → 3Pb + SO2 a. Balance the equation. b. How many moles of Pb will form from 17 moles of PbO (excess PbS)? 57.33g PbO x 1 mole of PbO/ c. How many moles of PbO are needed to make 27.3 moles of SO2 (excess PbS)? d. Give 17.6 moles of PbS and 36 moles of PbO, which is the limiting reactant?

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

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.

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.