Me pls someone give me the answers to the self-check! 1-5

3 and 5 do not make sense, but I can answer the rest.

1. Reactants are on the left side, and the products are on the right side. Reactants, hence the name, react to form products. So the Cd(NO3)2 compound and the H2S compound are reactants, and the ones on the other side are products.

2. The little letters in parentheses tell you the state of matter. (s) is solid, (aq) is aqueous, (l) is liquid, and (g) is gas.

4. The law of conservation of mass is important, because in reactions mass never disappears just like energy. Mass is never created or destroyed. Mass does not randomly appear, and if the products have less mass than the reactants, it is not that the mass was destroyed.  

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

2b2t

explanation:

2b2t