Determine which of the following pairs of reactants will result in a spontaneous reaction at 25°c.
a. zn(s) + na+(aq)
b. fe(s) + ba2+(aq)
c. cr3+(aq) + ni(s)
d. sn4+(aq) + mg(s)

What element has similar physical and chemical properties as boron.

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?

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