Chemical Reactions - Solutions Sheet
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1+WS 4.7 - Writing Chemical Reactions solutions
1.
Sulfur dioxide gas (from coal) combines with oxygen (from air) to form sulfur trioxide gas.
2 SO2
+ O2
---> 2 SO3
(g)
(g)
(g)
2.
Sulfur trioxide gas (from previous reaction) reacts with water in the air to form sulfuric acid (acid rain!)
SO3
+ H2O
---> H2SO4
(g)
(g)
(aq)
3.
Carbon dioxide and water combine in plants using chlorophyll as a catalyst to form glucose (C
H
O
) and
6
12
6
oxygen.
chlorophyll
6 CO2
+ 6 H2O
----------> C6H12O6
6 O2
(g)
(l)
(s) +
(g)
4.
The Haber process uses 200 atm of pressure and iron as a catalyst to combine nitrogen and hydrogen to make
ammonia (NH
) gas
3
200 atm / Fe
N2
+ 3 H2
----------------> 2 NH3
(g)
(g)
(g)
5.
Phosphoric acid (in soda) combines with potassium hydroxide to form potassium phosphate & water.
H3PO4
+ 3 KOH
------> K3PO4
3 H2O
(aq)
(aq)
(aq)
+
(l)
6.
In a double-replacement reaction, barium chloride reacts with ammonium sulfate to form aqueous ammonium
chloride and insoluble barium sulfate (a precipitate used for GI tract scans)
BaCl2
+ (NH4)2SO4
------> 2 NH4Cl
BaSO4
(aq)
(aq)
(aq)
+
(s)
7.
Steam reacts with carbon at high temperatures to produce carbon monoxide and hydrogen.
Δ
H2O
+ C
------> CO
H2
(g)
(s)
(g)
+
(g)
8.
Baking soda (sodium bicarbonate) reacts with vinegar (acetic acid) to form aqueous sodium acetate, carbon
dioxide, and water.
NaHCO3
+ HC2H3O2
------> NaC2H3O2
CO2
H2O
(s)
(l)
(aq)
+
(g)
+
(l)
9.
.
Aluminum metal and elemental sulfur (S
) react at high temperatures to form aluminum sulfide
8
Δ
16 Al
+ 3 S8
------> 8 Al2S3
(s)
(s)
(s)
10.
Ethyl alcohol (C
H
O) (obtained from corn) burns in our car engines (combustion reaction).
2
6
C2H6O
+ 3 O2
------> 2 CO2
3 H2O
(l)
(g)
(g)
+
(g)
11.
Potassium iodide reacts with lead (II) nitrate to form aqueous potassium nitrate and lead (II) iodide precipitate.
2 KI
+ Pb(NO3)2
------> 2 KNO3
PbI2
(aq)
(aq)
(aq)
+
(s)
12.
Solid iron (II) sulfide reacts with hydrochloric acid to form hydrogen sulfide (H
S) gas and aqueous iron (II)
2
chloride.
FeS
+ 2 HCl
------> H2S
FeCl2
(s)
(aq)
(g)
+
(aq)
13.
A piece of copper wire placed in a aqueous silver nitrate solution will produce blue copper(II) nitrate solution (aq)
and pure silver.
Cu
+ 2 AgNO3
------> Cu(NO3)2
2 Ag
(s)
(aq)
(aq)
+
(s)
14.
In an unusual reaction, solid barium hydroxide octahydrate reacts with solid ammonium nitrate to form ammonia
gas (NH
), aqueous barium nitrate, and water.
(hint: use coefficient 10 in front of the water)
3
Ba(OH)2 • 8 H2O
+ 2 NH4NO3
------> 2 NH3
Ba(NO3)2
+ 10 H2O
(s)
(s)
(g)
+
(aq)
(l)
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