Introduction to Reactions
Homework 8.1
List the 4 indicators of chemical change.
"i> Yoÿ::.., o:1 :,ÿ,.ÿ :,/: . (} ISÿ
"f(ÿF/Vlf. ;:[,/(/Y) :91 (:: ÿ,:/;" :'( .: :0 l:('J(
()
:
:
Give the meaning of each symbol:
, ÿ ::> } l :>1
A
: )l'< !
2)
(aq). :'.ÿL,' )(':' :.<.ÿ::
,::'. ÿ:ÿ:':'/ÿ
Using the Law of Conservation of mass, solve for the missing values.
a. Fe2Os
-ÿ
304g
b. C7H26
?
c. 2. Rb
Fe
224g
+
02
352g
+
Atoms Br_ÿ7
02
,ÿr3.-
80 ?
ÿ>
C02
308g.
1 BP2
Atoms RbT-
Reactions One
+
+
H20
..........
144g
.
÷ 2. RbBP
-ÿ
-ÿ
Atoms Rb ÿ
Atoms Bn .2
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3
Homework 8.1
Writing Skeletal Equations
Write the skeletal reaction from the following word reactions
1. Zinc metal reacts with silver nitrate powder to yield silver metal and
zinc nitrate crystals
rÿc,ÿ>-I- /Iÿ)ÿ4ÿ.:ÿ,ÿ> > ,",.ÿ.iÿ.-.ÿ ' -ÿ'ÿI°iÿ''ÿ"
"ÿ,&/Solid lithium combines with solid sulfur to form lithium phosphide
,/ x, crystals
3. Aqueous barium iodide is mixed with lithium phosphate to form
aqueous lithium iodide and solid barium phosphate
4. Solid mansanese combines with bromine 8as to form solid
mansanese (111) bromide
'S) ,
°
Cobalt metal combines with sulfur powder to form cobalt (11) sulfide
crystals
Lÿ)
4
. 'ÿ
..
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Reactions One
Writing Skeletal Equations Continued
Homework 8.1
6. Cesium oxide crystals decompose into cesium metal and oxygen gas
°
B°
Potassium iodide crystals decompose into potassium metal and
Iodine gas
Solid aluminum combines with nitrogen gas to form aluminum
nitride crystals
9. Solid sodium metal is placed in a flask with gaseous chlorine to form
sodium chloride
10. Bromine gas is reacted with solid potassium odide to form iodine
gas and potassium bromide crystals
"Iÿÿ
Reactions One
,
1I
t:)
"'ÿ
<+:,) -'; t", fiÿ' f;,)
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5
Balancing Equations
Homework 8.2
Balance the following chemical reactions,
1.
ÿJ
2,
3.
4.
ÿ)
Z/
.H2
.Mg
+
Ba
+
AI
+
+
ÿ.02
.ÿ
H2
+
02
÷
H20
÷
Cl2
. Z__ÿnÿO,
6.
02
ÿ
"ÿ
BaO
ÿ
'i ÿo
N2
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MgC12
"ÿ
ÿ
A1203
+ÿ/0ÿ
NH3
Reactions One
Balancing Equations Continued
7. ÿI Na
Homework 8,2
+ 02 'ÿ "ÿ Na20
8. (.o Mg + ÿP4 "ÿÿ-ÿ Plg3P2
9. K20 + H20 -=> / KOH
18. A1 +
11.
ÿt:J CuO => A1203 + ..... Cu
SF6
Reactions One
=> S +
,ÿ F2
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Balancing Equations II
Homework 8,3
Balance the following chemical reactions.
1. (ÿ F2 + ÿ- A1203 -> L_{ AIF3 + "ÿ02
2. I2 + ÿ} Na2S203 -> ÿ/ NaI + Na2S400
2_7_ ..ÿ- 7
,{. yL, XT±,/
4. ÿ CaC12 + 'Jÿ AgN03 ÿ
AgC1 + Ca(N03)2
5.ÿ-- A1 + ÿ CuS04 ÷ ":ÿ.ÿ Cu
6. CÿHÿ
8
+ <) 02
->
ÿ1 cincochem.pbworks.com
A12 (S04) 3
C02 + Z-J H20
Reactions One
Balancing Equations II
Homework 8.3
From the word equation, write the skeletal equation and balance.
.
,
Chlorine gas is bubbled through a solution of potassium iodide to
produce solid iodine and a solution of potassium chloride.
Skeletal:
(',i
Balanced:
('I
" -
"
ÿ,, ,
' ' '
.
Solid silver (I) oxide can be heated to give silver metal and oxygen
8as.
Skeletal:
!/ÿ (ÿ
)" "'
< ), ÿ-i)
Balanced: ? ;,<ÿ ,ÿ)
.
Solid silver (I) carbonate decomposes into solid silver (I) oxideand
gaseous carbon dioxide when it is heated.
,>.>,ÿ÷ /\ <,i., ()< ,..) +
Skeletal: /ÿ',<;,,:, ,,,)?,
Reactions One
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Homework 8.3
Ba/ancing Equations II
10. Solid aluminum dropped into a solution of copper (11) sulfate
produces a solution of aluminum sulfate and solid copper.
Skeletal: /\,/(ÿ) + (Z J)'l (ÿ) -)
Balanced:
) \ Cÿ,l
ÿ" '
""-
( .ÿ,,k(ÿ )
t.,ÿ!
-',
11. A solution of sodium phosphate combined with a solution of iron
(111) chloride produces a solution of sodium chloride and solid iron
(111) phosphate.
Balanced: jÿc:,.,' ÿ ÿ()ÿ1 ÿ ,,.!i)
12. Aqueous iron (11t) chloride is mixed with aqueous ammonium
hydroxide to form ammonium chloride crystals and aqueous iron
(111) hydroxide
Balanced:
10
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Reoctions One