(total: 20 points)
1)
? a) Balance the following reactions by inspection: (1.5 points each)
-/ _2_CsHyg0,() + 12 05(8) = _1V_C0,(g) + _W_sza)
X% X%
v 4 ¥ & i 4 v S
iad %
& 20 10
o) (o]
B Als) + 3 Fes04(s) = __A1,05(s) + _I_Fe(s)
< v ¥ Y oY v ‘/
? 12 )
/a\/ 1 /o e
b) Complete the following table: (10 points)
Complete Symbol Y™ iy SNi ol
Protons 34 4z 28 1<
Neutrons 48 sy 30 16
) Electrons 36 29 Zp 18
Net charge =3 +4 +2 -3
¢c) In Millikan’s oil drop experiment, where he determined the charge of an electron, the
charged oil droplets experienced two opposing forces (one upward and one downward).
Those two forces were: (2 points)
i) electrostatic and magnetic @gravitational and electrostatic _
ii) magnetic and gravitational iv) centripetal and centrifugal Qeutoctain €
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, Problem 1 continued)
Rutherford’s experiment, in which he observed that a small fraction of alpha particles
were deflected by large angles upon striking an extremely thin gold foil, demonstrated
that: (2 points)
i) Thomson’s "plum pudding" model of the atom was correct
ii) alpha particles are heavier than gold atoms
iii) the majority of the interior of an atom is empty space
most alpha particles punched holes in the gold foil
e) Calculate the percentage of oxygen (O), by mass, in aluminum perchlorate nonahydrate
(Al(ClO4); - 9H,0). (3 points)
ies,988 40 A100%,=
68.9249348R%
YW Heg€s1v 4 5 n) cel0qyz
g HD0
) [ 624244/ D
o == sz
25452
i Scanned with
& CamScanner’;
1)
? a) Balance the following reactions by inspection: (1.5 points each)
-/ _2_CsHyg0,() + 12 05(8) = _1V_C0,(g) + _W_sza)
X% X%
v 4 ¥ & i 4 v S
iad %
& 20 10
o) (o]
B Als) + 3 Fes04(s) = __A1,05(s) + _I_Fe(s)
< v ¥ Y oY v ‘/
? 12 )
/a\/ 1 /o e
b) Complete the following table: (10 points)
Complete Symbol Y™ iy SNi ol
Protons 34 4z 28 1<
Neutrons 48 sy 30 16
) Electrons 36 29 Zp 18
Net charge =3 +4 +2 -3
¢c) In Millikan’s oil drop experiment, where he determined the charge of an electron, the
charged oil droplets experienced two opposing forces (one upward and one downward).
Those two forces were: (2 points)
i) electrostatic and magnetic @gravitational and electrostatic _
ii) magnetic and gravitational iv) centripetal and centrifugal Qeutoctain €
svow\hd
\Y
This problem continues on the following page.
i Scanned with
& CamScanner’;
, Problem 1 continued)
Rutherford’s experiment, in which he observed that a small fraction of alpha particles
were deflected by large angles upon striking an extremely thin gold foil, demonstrated
that: (2 points)
i) Thomson’s "plum pudding" model of the atom was correct
ii) alpha particles are heavier than gold atoms
iii) the majority of the interior of an atom is empty space
most alpha particles punched holes in the gold foil
e) Calculate the percentage of oxygen (O), by mass, in aluminum perchlorate nonahydrate
(Al(ClO4); - 9H,0). (3 points)
ies,988 40 A100%,=
68.9249348R%
YW Heg€s1v 4 5 n) cel0qyz
g HD0
) [ 624244/ D
o == sz
25452
i Scanned with
& CamScanner’;
