Chem 171 F09 Q10 Metal Enth Key

Chem 171 F09 Q10 Metal Enth Key - 1. Chem 171 Quiz 10...

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Chem 171 Quiz 10 Version A 1. Write the balanced net ionic equation for the following reaction: Zn (s) + CuCl 2 (aq) Æ ZnCl 2 (aq) + Cu (s) Which elements are being oxidized and reduced? Identify the reducing agent and the oxidizing agent. Zn (s) + Cu 2+ (aq) Æ Zn 2+ (aq) + Cu (s) Zn atoms are oxidized (they lose electrons) Copper ions are reduced (they gain electrons) Zn is called the reducing agent Cu 2+ is called the oxidizing agent 2. A metal pellet with a mass of 100.0 g, originally at 88.4 o C, is dropped into 125 g of water originally at 25.1 o C. The final temperature of both the pellet and the water is 31.3 o C. The specific heat capacity of water is 4.184 J/g o C. Calculate the heat capacity in J/ o C of the pellet. q = m x specific heat cap x Δ T. q = heat capacity x Δ T. Δ T water = ( (31.3 – 25.1)= 6.2 o C. T pellet =( 31.3 -88.4) = -57.1 o C q water = 4.184 J / g o C x 125 g x (31.3 – 25.1) o C = 3242.6 J q water + q pellet = 0; q pellet = -3242.6 J -3242.6 J = C pellet x (-57.1 o C) C pellet = 57 J / o C Chem 171 Quiz 10 Version B 1. Write the balanced net ionic equation for the following reaction: Cr(s) + Ni 2+ (aq) Cr 3+ (aq) + Ni(s) Which elements are being oxidized and reduced? Identify the reducing agent and the oxidizing agent. 2Cr(s) + 3Ni
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Chem 171 F09 Q10 Metal Enth Key - 1. Chem 171 Quiz 10...

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