Un gas que ocupaba un volumen de 528 ml a la presión de 745 mmHg y a la temperatura de 12 ºC, fue dejado expandirse hasta que el volumen midió 890 ml a la temperatura de 30 ºC. ¿A qué presión estará sometido el gas?

c is the answer because when something is left after something evaporates that shows the chemical change.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

a corroding iron, if that's one of your choices

you need to have a picture of the atom that way we can answer it