Consider the reactions of Na, K, Ca and Al with water. Reactivity of metals incr

Question

Consider the reactions of Na, K, Ca and Al with water. Reactivity of metals increases going down the Group IA metals. Use the observations from reaction 1 and 2 to compare the reactivity of Na metal to K metal, which metal gave more vigorous reaction? Explain your answer, Compare the reactivity of Nametal to Ca metal Al metal. Describe how the Na metal was more reactive than Ca metal and how Al meal was the least reactive. Is the following statement correct? Reactivity of metals decreases going left to right on the periodic table. Support your answer. Did the aluminum react with water? Is this an expected reaction or not? Do you worry about getting the aluminum foil at your home wet?

Explanation / Answer

1 )   K is more reactive towards water . because K is more electropositive metal compared to Na. so the reactivity of K is more

K + H2O -----------------> KOH + H2

2)

Na is more electropositive than Ca and Al so the reaction is very rapid with water

Na + H2O -------------------> NaOH + H2

3)

yes Al will react with water form Al (OH)3

Al + 3H2O --------------------> Al(OH)3 + 3/2 H2

4 )

from the left to right the metallic nature of elements decreases and electronegativity increases due to increase in electronegativity hydration of element favours but not reaction.

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