A. the half-life for a first order reaction in 49 minutes. what is the rate constant? b. for a second order reaction, the half-life is 726 seconds. starting with a concentration of 0.600 m, how long will it take for the concentration to decrease to 0.150 m? c. the half-life for a first order reaction is 2768 years. starting with a concentration of 0.345 m, what will the concentration be after 11,072 years? d. the half-life for first order reaction a is 75 minutes. the half-life for a different first order reaction b is 322 minutes. which reaction has the faster rate? (a or b) which reaction has the larger rate constant, k? (a or b)

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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.

answer7,570,82356 cubic centimeters;