UNIT 8 HW KEY
Period
Name
CRHS Academic Chemistry
UNIT 8 -- Chemical Reactions
HOMEWORK Due Date
Assignment
On-Time (100)
Late (70)
8.1 8.2 8.3 8.4 8.5
Warm-Up
EC
Notes, Homework, Exam Reviews and Their KEYS located on CRHS Academic Chemistry Website: https://cincochem.pbworks.com
Unit 8 HW
Page 2 of 16
Page 3 of 16
Unit 8 HW
WARM-UPS Day 1
Day 7
Day 2
Day 8
Day 3
Day 9
Day 4
Day 10
Day 5
Day 11
Day 6
Day 12
Unit 8 HW
Page 4 of 16
HW 8.1 REACTIONS AND SKELETAL EQUATIONS ,
List the 4 indicators of a chemical change,
a)
b) c)
d) ,
Give the meaning of each symbol:
(s)
O) __ (g) (aq)
,
Using the Law of Conservation of mass, solve for the missing values. a. Fe20s --} Fe + 02
304g b. CTHÿ
224g +
? c. 2 Rb
ÿ (ÿ) ÿf ..... ÿ7 "°:> (%S
02
-'}
352g +
1 Br2
Atoms Rbÿo Atoms Brÿ
? C02
+
308g -) --) -)
H=O
144g 2 RbBr
Atoms Rb Atoms Br ÿ
4. Write the skeletal reaction from the following word reactions a,
Zinc metal reacts with silver nitrate powder to yield silver metal and zinc nitrate crystals
b°
Solid lithium combines with solid sulfur to form lithium sulfide crystals
Page 5 of 16
C,
Unit 8 HW
Aqueous barium iodide is mixed with lithium phosphate to form aqueous lithium iodide and solid barium phosphate
ÿ.. t
,£77
d°
Solid manganese combines with bromine gas to form solid manganese (111) bromide
e°
Cobalt metal combines with sulfur powder to form cobalt (11) sulfide crystals
f,
Cesium oxide crystals decompose into cesium metal and oxygen gas
%k"
g. Potassium iodide crystals decompose into potassium metal and Iodine gas
h,
Solid aluminum combines with nitrogen gas to form aluminum nitride crystals
, ff
Solid sodium metal is placed in a flask with gaseous chlorine to form sodium chloride
j, Bromine gas is reacted with solid potassium iodide to form iodine gas and potassium bromide crystals
Unit 8 HW
HW 8.2 BALANCING EQUATIONS Balance the following chemical reactions.
02 -)
,
2,
Mg +
3.
ÿJBa +
5.
dÿ
6.
.......
ÿ)02
Mn207 -)'
:% H2 +
7. Na +
MgCI2
Cl2
02 "-)
Z,'/AI ÿ +
4.
ÿ H20
Br2 + CuF2
8. Cobalt metal combines with sulfur powder to form cobalt (11) sulfide crystals
.
Potassium metal reacts with chromium (IV) nitrate to form potassium nitrate and chromium metal.
Predict the products and balance the following single replacement reactions. Write "NR" if no reaction occurs.
10.
K
4-
Zn(N03)2 --)
ÿ'ÿ ÿ!%
ÿ,!
....
ÿ
....
Unit 8 HW
Page 11 of 16 11,
12. 3 CI2
13.
+
ÿ FeCI3
+
,ÿNa%} +
Cal2 -->
Identify, predict the products, and balance the following reactions. 14.
NH3
15.
AI
--')'
+
"ÿ '
-
Mg2P3 -->
Unit 8 HW
Page 12 of 16
HW 8.5 DOUBLE REPLACEMENT & ACID BASE REACTIONS Identify the following reactions as Synthesis, Decomposition, Combustion, Single Replacement, Acid-Base, or Precipitation. There may be more than one correct answer. 1, .
3. 4.
,
Li2C03 + BaBr2 --) LiBr + BaC03
Pentane (CsH12) burns with oxygen to form carbon dioxide and water.
F2 + Li -)LiF Potassium iodide crystals are heated to form potassium metal and iodine gas
HN03+ Ba(OH)2 -> Ba(NQ3)2 + H2p ÿ '&ÿ%J';,'-'ÿ i
6.
ÿ., ÿ)
-
Bromine gas is reacted with solid potassium iodide to form iodine gas and potassium bromide
Predict the products and balance the following double replacement reactions. Write "N R" if no reaction occurs.
7,
8,
Na3P04 + ÿ'ÿMgCI2 "-)
_ÿ__K3P04+3 Sr(CI04)2 "-> ÿ/ 1/-ÿJI
9,
PbSO4(aq) + ÿ(NH4)2S(aq) "->
10.
Ca(OH)2 + ÿ(NH4)2S
mÿ
..,?.
ii,
BaCl2 +
. , A ,.
2
Page 13 of 16
Unit 8 HW
Identify, predict the products, and balance the following reactions. Write "N R" if no reaction occurs. 12. AgNO3(aq)+ NaCl(aq) -)
13. ÿ b(s)+
Se --)
0ÿ
......
ÿjÿ'
4ÿ
ÿ/ÿ C
14. Iron (111) oxide is broken down,..
/
15.
SnCl4(aq) +
Cr(s) -)
16.'ÿCs + 12 "-)2Csl
17,
CH3CH2CH20H + 02 -)
5 1. ÿMgO --)ÿMg + 02
i
Unit 8 HW
Page 14 of 16
Page 15 of 16
Unit 8 HW
Name
Ion
Name
Ion
acetate
C2H302-1 or CH3CO0-1
hypochlorite
CIO-1
ammonium
NH4+i
nitrate
NO3-i
Metal Uthlum Potassium Ba ri u m Calclum
carbonate
COÿ-2
nitrite
NO2-1
chlorate
CIOB-1
perchlorate
004-1
chlorite
C102-1
permanganate
Mn04-1
chromate
Cr04-2
phosphate
PO£B
cyanide
CN-I
phosphite
p03-3
Sodlum Magnesium
Alumlnum Manganese
Zlnc Chromlum Iron
Coba It dichromate
Cr207-2
silicate
SiO3-2
hydrogen carbonate
HC03-1
sulfate
S04-2
hydroxide
OH-1
sulfite
SOB-2
Nlckel Tin Lead (Hydrogen) Copper Mercury
SI Iv er Soluble compounds contain
Common exceptions
Cÿ30J, CH3COO-
None
NHÿ
None
NO;-
None
CN-
None
CIO-
None
cloÿ CIOÿ clo2
None
Br-
Compounds of Ag+, Pb2+, and Hg22+
CF
Compounds of Ag+, Pb2+, and Hg22+
I-
Compounds of Ag+, Pb2+, and Hg]+
SOÿ-
Compounds of Sr2+, Ba2+, Pb2+, and Hg22+
Insoluble
Common exceptions
None None
compounds contain COÿ-
Compounds of NHÿ and the alkali metal cations
poÿ-
Compounds of NHÿ and the alkali metal cations
CFOÿ-
Compounds of NHÿ- and the alkali metal cations
Crÿoÿ-
Compounds of NHÿ and the alkali metal cations
OH-
Compounds of NH4, the alkali metal cations, Ca2+, SF2+,
S2-
Platinum Gold
and Ba2+
Compounds of NHÿ, the alkali metal cations, Ca2+, Sr2+, and Ba2+
Unit 8 HW
Page 16 of 16
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Name
CRHS Academic Chemistry
UNIT 8 -- Chemical Reactions
HOMEWORK Due Date
Assignment
On-Time (100)
Late (70)
8.1 8.2 8.3 8.4 8.5
Warm-Up
EC
Notes, Homework, Exam Reviews and Their KEYS located on CRHS Academic Chemistry Website: https://cincochem.pbworks.com
Unit 8 HW
Page 2 of 16
Page 3 of 16
Unit 8 HW
WARM-UPS Day 1
Day 7
Day 2
Day 8
Day 3
Day 9
Day 4
Day 10
Day 5
Day 11
Day 6
Day 12
Unit 8 HW
Page 4 of 16
HW 8.1 REACTIONS AND SKELETAL EQUATIONS ,
List the 4 indicators of a chemical change,
a)
b) c)
d) ,
Give the meaning of each symbol:
(s)
O) __ (g) (aq)
,
Using the Law of Conservation of mass, solve for the missing values. a. Fe20s --} Fe + 02
304g b. CTHÿ
224g +
? c. 2 Rb
ÿ (ÿ) ÿf ..... ÿ7 "°:> (%S
02
-'}
352g +
1 Br2
Atoms Rbÿo Atoms Brÿ
? C02
+
308g -) --) -)
H=O
144g 2 RbBr
Atoms Rb Atoms Br ÿ
4. Write the skeletal reaction from the following word reactions a,
Zinc metal reacts with silver nitrate powder to yield silver metal and zinc nitrate crystals
b°
Solid lithium combines with solid sulfur to form lithium sulfide crystals
Page 5 of 16
C,
Unit 8 HW
Aqueous barium iodide is mixed with lithium phosphate to form aqueous lithium iodide and solid barium phosphate
ÿ.. t
,£77
d°
Solid manganese combines with bromine gas to form solid manganese (111) bromide
e°
Cobalt metal combines with sulfur powder to form cobalt (11) sulfide crystals
f,
Cesium oxide crystals decompose into cesium metal and oxygen gas
%k"
g. Potassium iodide crystals decompose into potassium metal and Iodine gas
h,
Solid aluminum combines with nitrogen gas to form aluminum nitride crystals
, ff
Solid sodium metal is placed in a flask with gaseous chlorine to form sodium chloride
j, Bromine gas is reacted with solid potassium iodide to form iodine gas and potassium bromide crystals
Unit 8 HW
HW 8.2 BALANCING EQUATIONS Balance the following chemical reactions.
02 -)
,
2,
Mg +
3.
ÿJBa +
5.
dÿ
6.
.......
ÿ)02
Mn207 -)'
:% H2 +
7. Na +
MgCI2
Cl2
02 "-)
Z,'/AI ÿ +
4.
ÿ H20
Br2 + CuF2
8. Cobalt metal combines with sulfur powder to form cobalt (11) sulfide crystals
.
Potassium metal reacts with chromium (IV) nitrate to form potassium nitrate and chromium metal.
Predict the products and balance the following single replacement reactions. Write "NR" if no reaction occurs.
10.
K
4-
Zn(N03)2 --)
ÿ'ÿ ÿ!%
ÿ,!
....
ÿ
....
Unit 8 HW
Page 11 of 16 11,
12. 3 CI2
13.
+
ÿ FeCI3
+
,ÿNa%} +
Cal2 -->
Identify, predict the products, and balance the following reactions. 14.
NH3
15.
AI
--')'
+
"ÿ '
-
Mg2P3 -->
Unit 8 HW
Page 12 of 16
HW 8.5 DOUBLE REPLACEMENT & ACID BASE REACTIONS Identify the following reactions as Synthesis, Decomposition, Combustion, Single Replacement, Acid-Base, or Precipitation. There may be more than one correct answer. 1, .
3. 4.
,
Li2C03 + BaBr2 --) LiBr + BaC03
Pentane (CsH12) burns with oxygen to form carbon dioxide and water.
F2 + Li -)LiF Potassium iodide crystals are heated to form potassium metal and iodine gas
HN03+ Ba(OH)2 -> Ba(NQ3)2 + H2p ÿ '&ÿ%J';,'-'ÿ i
6.
ÿ., ÿ)
-
Bromine gas is reacted with solid potassium iodide to form iodine gas and potassium bromide
Predict the products and balance the following double replacement reactions. Write "N R" if no reaction occurs.
7,
8,
Na3P04 + ÿ'ÿMgCI2 "-)
_ÿ__K3P04+3 Sr(CI04)2 "-> ÿ/ 1/-ÿJI
9,
PbSO4(aq) + ÿ(NH4)2S(aq) "->
10.
Ca(OH)2 + ÿ(NH4)2S
mÿ
..,?.
ii,
BaCl2 +
. , A ,.
2
Page 13 of 16
Unit 8 HW
Identify, predict the products, and balance the following reactions. Write "N R" if no reaction occurs. 12. AgNO3(aq)+ NaCl(aq) -)
13. ÿ b(s)+
Se --)
0ÿ
......
ÿjÿ'
4ÿ
ÿ/ÿ C
14. Iron (111) oxide is broken down,..
/
15.
SnCl4(aq) +
Cr(s) -)
16.'ÿCs + 12 "-)2Csl
17,
CH3CH2CH20H + 02 -)
5 1. ÿMgO --)ÿMg + 02
i
Unit 8 HW
Page 14 of 16
Page 15 of 16
Unit 8 HW
Name
Ion
Name
Ion
acetate
C2H302-1 or CH3CO0-1
hypochlorite
CIO-1
ammonium
NH4+i
nitrate
NO3-i
Metal Uthlum Potassium Ba ri u m Calclum
carbonate
COÿ-2
nitrite
NO2-1
chlorate
CIOB-1
perchlorate
004-1
chlorite
C102-1
permanganate
Mn04-1
chromate
Cr04-2
phosphate
PO£B
cyanide
CN-I
phosphite
p03-3
Sodlum Magnesium
Alumlnum Manganese
Zlnc Chromlum Iron
Coba It dichromate
Cr207-2
silicate
SiO3-2
hydrogen carbonate
HC03-1
sulfate
S04-2
hydroxide
OH-1
sulfite
SOB-2
Nlckel Tin Lead (Hydrogen) Copper Mercury
SI Iv er Soluble compounds contain
Common exceptions
Cÿ30J, CH3COO-
None
NHÿ
None
NO;-
None
CN-
None
CIO-
None
cloÿ CIOÿ clo2
None
Br-
Compounds of Ag+, Pb2+, and Hg22+
CF
Compounds of Ag+, Pb2+, and Hg22+
I-
Compounds of Ag+, Pb2+, and Hg]+
SOÿ-
Compounds of Sr2+, Ba2+, Pb2+, and Hg22+
Insoluble
Common exceptions
None None
compounds contain COÿ-
Compounds of NHÿ and the alkali metal cations
poÿ-
Compounds of NHÿ and the alkali metal cations
CFOÿ-
Compounds of NHÿ- and the alkali metal cations
Crÿoÿ-
Compounds of NHÿ and the alkali metal cations
OH-
Compounds of NH4, the alkali metal cations, Ca2+, SF2+,
S2-
Platinum Gold
and Ba2+
Compounds of NHÿ, the alkali metal cations, Ca2+, Sr2+, and Ba2+
Unit 8 HW
Page 16 of 16
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= w-
od xÿ
E
E
E
:ÿ
rÿ
E cjÿ--."€-
E
0 E
Z
0
,_o €,I
¢o
= ;£.
, or-
,,.,.
ÿ
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dÿ "r-
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