Chemistry

4. a) Draw an enthalpy diagram for a general endothermic reaction; label the axis, reactants, products, and DH with its sign. [2 marks] b) Given the following choices of reactants, write balanced total ionic and net ionic equations that best represent the reaction: [2 marks] (i) KNO3(aq) + CuCl(aq) – ? (ii) NaClO (aq) + CaCl(aq) – ? (iii) Li,SO (aq) + AgNO3(aq) – ? (iv) NH Br(aq) + Pb(CH3COO)2(aq) – ? c) When each of the following pairs of aqueous solutions is mixed, does a precipitation reaction occur? If so, write balanced molecular equations for: [1 Mark] (i) Potassium carbonate + Barium hydroxide (ii) Aluminum nitrate + Sodium phosphate TIL

Chemistry, Science / By

EXPERT ANSWER a) Enthalpy diagrams are an easy way to see how the energy changes in a reaction over time. If delta H is positive then it’s an endothermic reaction and the product energy is higher than the starting energy. If delta H is negative then it’s an exothermic reaction and the product energy is lower than the starting …

4. a) Draw an enthalpy diagram for a general endothermic reaction; label the axis, reactants, products, and DH with its sign. [2 marks] b) Given the following choices of reactants, write balanced total ionic and net ionic equations that best represent the reaction: [2 marks] (i) KNO3(aq) + CuCl(aq) – ? (ii) NaClO (aq) + CaCl(aq) – ? (iii) Li,SO (aq) + AgNO3(aq) – ? (iv) NH Br(aq) + Pb(CH3COO)2(aq) – ? c) When each of the following pairs of aqueous solutions is mixed, does a precipitation reaction occur? If so, write balanced molecular equations for: [1 Mark] (i) Potassium carbonate + Barium hydroxide (ii) Aluminum nitrate + Sodium phosphate TIL Read More »

1. At STP, what volume of oxygen is needed to produce 41.8 g of carbon dioxide?;2. What volume of carbon monoxide at STP is needed to produce 701 mL of carbon dioxide?

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2CO(g) + O2(g) ==> 2CO2(g) 1. At STP, what volume of oxygen is needed to produce 41.8 g of carbon dioxide?; 2. What volume of carbon monoxide at STP is needed to produce 701 mL of carbon dioxide? EXPERT ANSWER 1. At STP conditions T=273K and P=1 atm mol CO2= mass/molecular weight = 41.8/44.01 = 0.950 mol …

1. At STP, what volume of oxygen is needed to produce 41.8 g of carbon dioxide?;2. What volume of carbon monoxide at STP is needed to produce 701 mL of carbon dioxide? Read More »

The transition metals of which period tend to form the strongest bonds with ligands? Select one: a. transition metals of period 6 b. transition metals of period 5 c. transition metals of period 2 O d. transition metals of period 3 e. transition metals of period 4 f. transition metals of period 1

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EXPERT ANSWER Transition metal of sixth period form strongest bond with the ligand because of the 5d series having effective overlapping with the bindings ligand so more the overlapping more stronger binding with the ligand.while in case of 3d metal there is not as much effective overlapping as compared to 4d and 5d series so …

The transition metals of which period tend to form the strongest bonds with ligands? Select one: a. transition metals of period 6 b. transition metals of period 5 c. transition metals of period 2 O d. transition metals of period 3 e. transition metals of period 4 f. transition metals of period 1 Read More »