The reactant concentration in a zero-order reaction was 5.00×10−2 M after 195 s and 2.50×10−2 M after 385 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Answer : The rate constant for this reaction is,

Explanation :

To calculate the rate constant for zero order reaction, the expression used is:

where,

= initial concentration

= final concentration = at 195 s

= final concentration = at 385 s

k = rate constant = ?

Now put all the given values in the above expression, we get:

      ............(1)

and,

       ............(2)

Subtracting 1 from 2, we get:

Therefore, the rate constant for this reaction is,

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

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.