plese help me solve these questions Question:1 There are six equations given in

Question

plese help me solve these questions

Question:1

There are six equations given in the experimental procedure.  Balance these equations below and transfer your results to the appropriate place in the experimental procedure. (Hint: The coefficient on HNO3 in reaction one is 4.)

(1)   Cu(s)  +      HNO3(aq)   ?      Cu(NO3)2(aq)  +      NO2(g)  +      H2O(l)

(2)   Cu(NO3)2(aq)  +      NaOH(aq)  ?      Cu(OH)2(s)   +      NaNO3(aq)

(3)   Cu(OH)2(s)   +  heat   ?      CuO(s)  +      H2O(l)

(4)   CuO(s)  +      H2SO4(aq)  ?      CuSO4(aq)  +      H2O(l)

(5)   CuSO4(aq)  +      Al(s)  ?      Al2(SO4)3(aq)  +      Cu(s)

(6)   Al(s)  +      HCl(aq)  ?      H2(g)  +      AlCl3(aq)

Question:2

Define the following (if necessary, see the glossary of your book):

a)  oxidation

b) reduction

c)  redox (oxidation reduction) reaction

d)  exchange (metathesis) reaction

e)  precipitation reaction

f)  displacement (single-replacement) reaction

g)  decomposition reaction

Question:3

Which of the reaction(s), 1 through 6, given in the experimental procedure would be classified as:

(Some reactions may be classified in more than one way.)

a)  exchange (metathesis) reaction(s)?

b)  precipitation reaction(s)?

c)  displacement (single-replacement) reaction(s)?

d)  decomposition reaction(s)?

e)  redox (oxidation-reduction) reaction(s)?

Question:4

Choose one of the reactions classified as a redox reaction and identify the element that is oxidized and the element that is reduced.  Also indicate the initial and final oxidation numbers of the atoms of the elements that undergo oxidation and reduction

Explanation / Answer

(1) Cu(s) +4 HNO3(aq) ? Cu(NO3)2(aq) +2 NO2(g) +2 H2O(l)

(2) Cu(NO3)2(aq) +2 NaOH(aq) ? Cu(OH)2(s) + 2NaNO3(aq)

(3) Cu(OH)2(s) + heat ? CuO(s) + H2O(l)

(4) CuO(s) + H2SO4(aq) ? CuSO4(aq) + H2O(l)

(5) 3CuSO4(aq) + 2Al(s) ? Al2(SO4)3(aq) +3 Cu(s)

(6)2 Al(s) +6 HCl(aq) ?3 H2(g) +2AlCl3(aq)

a) oxidation

loss of electrons is called as oxidation

b) reduction

gain of electrons is called as reduction

c) redox (oxidation reduction) reaction

reaction in which both oxidation and reduction takes place is called as redox reaction

d) exchange (metathesis) reaction

Metathesis reactions are those where the cations and anions of a given compound exchange in a chemical reaction. One of the classical compounds is Silver Nitrate and Copper Chlorine to form Silver Chlorine and Copper Nitrate. Here you can see the reaction:

AB + CD ----> AD + BC

AgNO3 + CuCl ----> CuNO3 + AgCl

e) precipitation reaction

Precipitation Reactions occur when cations and anions of aqueous solutions combine to form an insoluble ionic solid, called a precipitate.

f) displacement (single-replacement) reaction

In a single displacement reaction the cation of compound is replaced by the metal that is added to the solution. These reactions will only work if the metal is more chemically active than the cation of the ionic compound that is in the reaction. The generic formula for a single displacement reaction is AX + B

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