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The chromium(II) hydride monomer, is both thermodynamically and kinetically unstable towards autopolymerization at ambient temperature, and so cannot be concentrated. Nevertheless, molecules of CrH 2 and Cr 2 H 4 have been isolated in solid gas matrices. [1] Cr is the second simplest molecular chromium hydride (after Chromium(I) hydride).
The Pourbaix diagram for chromium in pure water, perchloric acid, or sodium hydroxide [1] [2] Chromium compounds are compounds containing the element chromium (Cr). Chromium is a member of group 6 of the transition metals. The +3 and +6 states occur most commonly within chromium compounds, followed by +2; charges of +1, +4 and +5 for chromium ...
The hydrogen content of chromium hydride is between zero and a few hundred parts per million in weight for plain chromium-hydrogen alloys. These values vary depending on alloying elements , such as iron , manganese , vanadium , titanium [ 12 ] and so on.
Chromium(II) chloride (chromous chloride) – CrCl 2; Chromium(II) sulfate – CrSO 4; Chromium(III) chloride – CrCl 3; Chromium(III) nitrate – Cr(NO 3) 3; Chromium(III) oxide – Cr 2 O 3; Chromium(III) sulfate – Cr 2 (SO 4) 3; Chromium(III) telluride – Cr 2 Te 3; Chromium(IV) oxide – CrO 2; Chromium pentafluoride – CrF 5; Chromyl ...
Molecular weight (M.W.) (for molecular compounds) and formula weight (F.W.) (for non-molecular compounds), are older terms for what is now more correctly called the relative molar mass (M r). [8] This is a dimensionless quantity (i.e., a pure number, without units) equal to the molar mass divided by the molar mass constant .
The resulting bright blue solution created from dissolving chromium(II) chloride is stable at neutral pH. [21] Some other notable chromium(II) compounds include chromium(II) oxide CrO, and chromium(II) sulfate CrSO 4. Many chromium(II) carboxylates are known. The red chromium(II) acetate (Cr 2 (O 2 CCH 3) 4) is somewhat famous. It features a Cr ...
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All polyoxyanions of chromium(VI) have structures made up of tetrahedral CrO 4 units sharing corners. [3] The hydrogen chromate ion, HCrO 4 −, is a weak acid: HCrO − 4 ⇌ CrO 2− 4 + H +; pK a ≈ 5.9. It is also in equilibrium with the dichromate ion: 2 HCrO − 4 ⇌ Cr 2 O 2− 7 + H 2 O