SME
Inorganic Chemistry · Problem type
Saline, molecular or metallic hydride
Use this for “What kind of hydride is CaH₂? Which gas forms when it is added to water?”
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Which kind of hydride is it?
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Hydrogen with a very electropositive metal is H⁻; with a nonmetal it shares electrons; in a transition metal it sits in the lattice.
Assumptions
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A hydride here is any binary compound of hydrogen with one other element.
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The kind follows the element’s place: groups 1 and 2 (Be and Mg aside) are saline, the p-block molecular, and many d-block metals metallic.
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Metallic hydrides often have no fixed formula; in PdHₓ, x stays below 1 and changes with the H₂ pressure.
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