Item 3 Which statement describes the electrical conductivity of metals and semiconductors? Choose the correct answer.

Metals are poor conductors at low temperatures.

The conductivity of metals changes with changing pressure.

The conductivity of semiconductors changes with changing pressure.

Semiconductors are poor conductors at low temperatures, but their resistance decreases with increasing temperature.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

answer: h+ its less than oh

explanation:

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.

there are two significant figures.