Chemistry
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New answer posted
a year agoContributor-Level 10
Hematite: Fe? O?
Magnetite: Fe? O?
Calamine: ZnCO?
Kaolinite: [Al? (OH)? Si? O? ]
New answer posted
a year ago
Contributor-Level 10
kc = [O? ]² / [O? ]³
3 * 10? = [O? ]² / [4 * 10? ²]³
[O? ]² = 192 * 10? ⇒ [O? ] = 4.38 * 10? ³²
New answer posted
a year agoContributor-Level 10
k = (2.303 / 5) log (0.1 / 0.001) = (2.303 * 2) / 5 = 4.606 / 5 = 0.921 min? ¹
New answer posted
a year ago
Contributor-Level 10
When acetone & 2-pentanone are added in a base for an aldol condensation reaction there are several possibilities that may arise for product formation.
But structure in choice (2) is not possible. It will be possible with 3-pentanone.
New answer posted
a year agoContributor-Level 10
Moles of HCl = (50 / 1000) * 0.5 = 0.025 moles
So, moles of CaCO? used = 0.025 / 2 = 0.0125 moles = 1.25 g
95% (Total mass of CaCO? ) = 1.25 g
Total mass of CaCO? = 1.25 / 0.95 = 1.32 g
New answer posted
a year agoContributor-Level 10
Thermosetting polymers such as Bakelite cannot be moulded again and are hence not reusable.
New answer posted
a year agoContributor-Level 10
p? = p? x? is not a correct form of Dalton's law of partial pressures.
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