Answer to Question #160893 in General Chemistry for justin

Question

____   2.  In this redox reaction: Mg_(s) + 2 AgNO_3(aq) ® 2 Ag_(s) + Mg(NO₃)_2(aq)

a.

Mg_(s) is oxidized and  is reduced

c.

Mg_(s) gains electrons

b.

Mg_(s) is reduced and  is oxidized

d.

 loses electrons

 

 

____   3.  In the reaction: Fe_(s) + 2 HCl _(aq) ® FeCl_2(aq) + H_2(g)

a.

Fe_(s) takes one electron from Cl^-_(aq)

c.

 takes two electrons from H_2(g)

b.

each  takes one electrons from Fe_(s)

d.

each  takes one electron from Cl^-_(aq)

 

 

____   4.  What change occurs when copper metal is oxidized?

a.

two protons are lost

c.

two electrons are lost

b.

two protons are gained

d.

two electrons are gained

 

 

____   5.  What change occurs when zinc ions, , are reduced?

a.

two protons are lost

c.

two electrons are lost

b.

two protons are gained

d.

two electrons are gained

 

 

____   6.  In a redox reaction,

a.

the number of electrons gained is greater than the number of electrons lost

b.

the number of electrons gained is less than the number of electrons lost

c.

the number of electrons gained equals the number of electrons lost

d.

the number of electrons gained equals the number of protons lost

 

 

____   7.  Which one of the following statements about redox reactions is correct?

a.

oxidation refers to the gain of electrons

c.

oxidation always requires oxygen

b.

reduction refers to the loss of electrons

d.

oxidation cannot occur without reduction

 

 

____   8.  Given the reaction CuCl_2(aq) + Mg_(s) ® MgCl_2(aq) + Cu_(s) which species is oxidized?

a.

Mg_(s)

b.

Cl^-_(aq)

c.

CuCl_2(aq)

d.

MgCl_2(aq)

 

 

____   9.  What is the oxidation number of sulfur in H₂SO₄?

a.

-2

b.

+2

c.

–4

d.

+6

 

 

____ 10.  What is the oxidation number of manganese in KMnO₃?

a.

+5

b.

+2

c.

–3

d.

+4

 

 

____ 11.  What is the oxidation number of carbon in CaCO₃?

a.

-4

b.

+1

c.

–3

d.

+4

 

 

____ 12.  What is the oxidation number of chlorine in the chlorate ion, ClO ?

a.

-1

b.

+1

c.

+5

d.

-3

 

 

____ 13.  In the reaction Fe₂O_3(s) + 3 H_2(g) ® 2 Fe_(s) + 3 H₂O_(g) the oxidation number of iron changes from

a.

+2 to 0

b.

+3 to 0

c.

+3 to +2

d.

+6 to 0

 

____ 15.  Which of the following metals reacts the quickest in a solution of hydrochloric acid: Zn, Ag, Fe, or Mg?

a.

Zn

b.

Ag

c.

Fe

d.

Mg

 

 

____ 16.  According to the activity series, which metal will react with a solution of hydrochloric acid, HCl_(aq)?

a.

magnesium

b.

lead

c.

nickel

d.

all of the above

 

 

____ 17.  Which metal from the following list is oxidized most readily: tin, zinc, copper, or iron?

a.

iron

b.

tin

c.

copper

d.

zinc

 

 

Matching    Match each of the following terms with its definition                                                   [KU, 3m]

 

 

 

 

 

 

 

 

 

a.

oxidation

d.

anode

b.

galvanic cell

e.

salt bridge

c.

voltmeter

f.

cathode

 

 

____ 18.  occurs at the anode of a galvanic cell

 

____ 19.  the electrode where reduction occurs

 

____ 20.  measures the voltage across the anode and cathode

 

____ 21.  allows ions to flow between cells in a galvanic cell

 

____ 22.  spontaneously converts chemical energy into electrical energy

 

____ 23.  the solid metal where oxidation occurs

Answer 1

oxidation is the process in which electrons are losse and reduction in which electrons are gain.

2) Mg is oxidised and Ag is reduced

3) Each takes1e from Fe

4)two electrons are lost

5)two electrons are lost

6) the number of electrons gained are equal to number of electrons lost

7)Oxidation always requires oxygen.

8) Mg is oxidized

9) +6

10)+5

11)+4

12)+5

13)+3 to 0

14)Mg

15) All

16)Zn