Chemical Reactions - Worksheet Answers
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2Chemical reactions - Worksheet answers
Glossary:
Aqueous: dissolved in water.
Catalyst: a substance that speeds up a reaction without being used up in that reaction
Compound: a substance made up of 2 or more different types of atom.
Endothermic: requiring energy for a chemical reaction to proceed.
Enthalpy: the stored energy within a substance
Exothermic: releasing energy during a chemical reaction
Molecule: a group of 2 or more atoms bonded together in a fixed composition.
Precipitate: a solid product formed when 2 aqueous solutions react.
Product: a substance formed during a chemical reaction.
Reactant: a substance undergoing a chemical reaction.
Questions:
1.
NAME
SYMBOL
COMPOSITION
sodium carbonate
Na
CO
2 sodium atoms, 1 carbon atom, 3 oxygen atoms
2
3
copper sulfate
CuSO
1 copper atom, 1 sulfur atom, 4 oxygen atoms
4
calcium carbonate
CaCO
1 calcium atom, 1 carbon atom, 3 oxygen atoms
3
magnesium chloride
MgCl
1 magnesium atom, 2 chlorine atoms
2
iron(III)oxide
Fe
O
2 iron atoms, 3 oxygen atoms
2
3
iron sulfate
FeSO
1 iron atom, 1 sulfur atom, 4 oxygen atoms
4
copper chloride
CuCl
1 copper atom, 2 chlorine atoms
2
magnesium sulfate
MgSO
1 magnesium atom, 1 sulfur atom, 4 oxygen atoms
4
2.
FORMULA
NAME
FORMULA
NAME
Na
SO
sodium sulfate
AgCl
silver chloride
2
4
NaBr
sodium bromide
HI
hydrogen iodide
K
P
potassium phosphide
NH
Cl
ammonium chloride
3
4
KOH
potassium hydroxide
(NH4)
SO
ammonium sulfate
2
4
CaO
calcium oxide
Cr(OH)
chromium hydroxide
3
CaI
calcium iodide
Ba
(PO
)
barium phosphate
2
3
4
2
CuO
copper(II) oxide
Cu
P
copper phosphide
3
2
Cu(OH)
copper(II) hydroxide
Ag
CO
silver carbonate
2
2
3
Fe(NO
)
iron(II)nitrate
Al(NO
)
aluminium nitrate
3
2
3
3
3.
covalent, ionic and covalent, covalent, covalent, ionic, metallic, covalent
4.
aq - aqueous, l - liquid, g - gas, s - solid, + - reacts with, → - produces
5.
a) sodium + oxygen → sodium oxide
b) 2Na
+ O
→ 2Na
O
(s)
2(g)
2
(s)
c) 5.39 grams, Law of Conservation of Mass
d) subscript numbers are only used when writing the formula of a substances. Normal sized
numbers are only used at the front of substances when balancing the number of atoms on
each side of the arrow in a symbolic equation.
6.
a) 2H
+ O
→ 2 H
0
2(g)
2(g)
2
(l)
b) 2KClO
→ 2 KCl
+ 3O
3(s)
(s)
2(g)
c) CH
+ 2O
→ CO
+ 2 H
O
4(g)
2(g)
2(g)
2
(l)
d) BaO
+ 2 HNO
→ Ba(NO
)
+ H
O
(s)
3(aq)
3
2(aq)
2
(l)
2Pb
O
→ 6PbO
+ O
e)
3
4(s)
(s)
2(g)
1
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