The balanced chemical equation for the reaction which occurs when Be is added to water is____________?
Correct answer: D. no reaction
- A. Be+2H2O?Be (OH)2+H2
- B. Be+H2O?Be (OH)2+H2
- C. Be+H2O?[Be (OH)4]+2+H2
- D. no reaction
Explanation
Beryllium does not normally react with water because a compact protective layer of beryllium oxide forms on its surface. This oxide film prevents further contact between beryllium and water, so no ordinary water-reaction equation is written. The likely mistake is choosing the hydroxide equation by applying the general reaction of some other Group 2 metals to beryllium.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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