Which of these is a concern with respect to using fuel cell cars?
o use of non-renewable resources
o cost of the distribution network
battery recharge or replacement
reliance on petroleum products

Cost of the distribution network  

Explanation:

The cost of building a distribution network is the major concern. Each refill station costs about $1.5 million.

A is wrong. Hydrogen comes from water, which is plentiful in the oceans. When hydrogen reacts in the fuel cell, the water is re-formed

C is wrong. The fuel cell will last for about 300 000 km.

D is wrong. Although hydrogen can be produced from petroleum, water is the most likely source.

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) the particles of the chair are strongly held together.