9. Practice identifying elements, compounds, and mixtures by playing this game. Next, check the appropriate box for each of the substances below to identify whether each is a;
pure element,
a pure compound,
or a mixture.

Water
Oxygen Gas
Lemonade
Oil and Water in a Bottle
Iron
Methane Gas (CH4)
Salt (NaCl)
Graphite (made from
carbon atoms)

this is graded and timed pls hurry and help !!!

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.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante