13) Use the activity series to predict which of the following reactions will occ

Question

13) Use the activity series to predict which of the following reactions will occur. Complete and balance the equations. If no reactions occurs, write “no reaction” as the product.

a) Ca(s) + H2 O (l)

b) Br2 ( l)+ KI(aq)

20) Interpret these equations in terms of the relative number of moles of each substance involved and indicate whether the reaction is exothermic or endothermic:

a) 2 Na+ Cl2 2 NaCl + 822 KJ

b) PCl5 +92.9 KJ PCl3 +Cl2

c) (c) S (s) + 2 CO ( g ) SO 2 ( g ) + 2 C ( s ) + 76   kJ

32)Students in a lab exercise were asked to choose among a sample of different metals to react with a solution of nickel(II) chloride. Which of the following metals should they choose? Write balanced equations for all that will react and explain why each will or will not react.

(a) Copper

(b) Zinc

(c) Aluminum

(d) Lead

(e) Calcium

Explanation / Answer

30) a.  Ca (s)+ 2H2O(aq) --> Ca(OH)2(s)+ H2 (g)

b. Br2(l) + 2 KI(aq) = 2 KBr(aq) + I2(l)

31. a exothermic, moles involed 2

b. endothermic , moles involed 1

c. exothermic, moles involed 1

32. nickel(2)chloride only react with copper. Reason: For the raction size of transition metal must be equal. In all other cases size of element is either high or lower than copper.

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