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notes_Class_Questions_11_to_13

notes_Class_Questions_11_to_13 - SH −(aq • NH 3 is...

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Chem 162 IN-CLASS QUESTION 11 Prof. Norman Complete the following reactions. Reactants are already balanced. Label reactants as strong acid (sa), weak acid (wa), strong base (sb), or weak base (wb). H 2 SO 4 (aq) + Na 2 O(s) Be(H 2 O) 4 2+ (aq) + 4 OH (aq) HF(aq) + PO 4 3 (aq) CaH 2 (s) + (NH 4 ) 2 CO 3 (aq)
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Chem 162 IN-CLASS ANSWER 11 Prof. Norman H 2 SO 4 (aq) + Na 2 O(s) Na 2 SO 4 (aq) + H 2 O( l ) sa sb Be(H 2 O) 4 2+ (aq) + 4 OH (aq) Be(OH) 4 2 (aq) + 4 H 2 O( l ) wa sb HF(aq) + PO 4 3 (aq) F (aq) + HPO 4 2 (aq) wa wb CaH 2 (s) + (NH 4 ) 2 CO 3 (aq) sb wa CaCO 3 ( s ) + 2 NH 3 (aq) + 2 H 2 (g)
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Chem 162 IN-CLASS QUESTION 12 Prof. Norman Rank the following in order of increasing water solubility: CF 4 CO H 2 S NH 3
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Chem 162 IN-CLASS ANSWER 12 Prof. Norman Solubility: CF 4 < CO < H 2 S < NH 3 CF 4 is nonpolar. CO is polar. H 2 S is polar and reacts to give aqueous acid: H 2 S(g) + H 2 O( l ) = H 3 O + (aq)
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Unformatted text preview: + SH − (aq) . • NH 3 is polar, forms hydrogen bonds, and reacts to give aqueous base: NH 3 (g) + H 2 O( l ) = OH − (aq) + NH 4 + (aq) . Chem 162 IN-CLASS QUESTION 13 Prof. Norman Consider dissolving the following compounds in water: NaC l MgO KBr CaS Rank the compounds or their ions in order of decreasing: a. − Δ H lattice b. −Δ H hydr Chem 162 IN-CLASS ANSWER 13 Prof. Norman Consider dissolving the following compounds in water: NaC l MgO KBr CaS Rank the compounds or their ions in order of decreasing: a. − Δ H lattice b. −Δ H hydr • The ranking for − Δ H lattice and −Δ H hydr is the same: MgO > CaS > NaC l > KBr. ( − Δ H lattice , −Δ H hydr increase with charge/size ratio. )...
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notes_Class_Questions_11_to_13 - SH −(aq • NH 3 is...

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