Electrochemistry Word Problems Worksheet With Answers Page 2
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310. Explain why a chemical equation must be balanced.
Law of Conservation of Matter (Mass) – matter cannot be created nor destroyed,
just rearranged
11. What are the reactants in the following chemical equation:
O
+ C
H
O
CO
+ H
O + energy
2
6
12
6
2
2
Oxygen
(O
)
2
Sugar
(C
H
O
)
6
12
6
12. How many atoms are in one molecule of C
H
O
?
6
12
6
24
13. Describe a chemical formula? Why is a chemical formula used in Science?
Way to express a compound using element symbols
Short, easy way to show complicated reactions
14. Define the following words: atom, element, molecule, compound.
Atom: smallest particle of an element; cannot be broken down by physical or
chemical means
Element: substance made up of only 1 type of atom
Molecule: 2 or more
that are chemically combined
ATOMS
Compound: 2 or more
that are chemically combined
ELEMENTS
15. Is the following chemical equation balanced: 6O
+ C
H
O
3CO
+ 4H
O?
2
6
12
6
2
2
No: oxygen, carbon, and hydrogen are not equal on both sides of the equation
16. List the following information about Potassium: atomic number, symbol, atomic mass, number of
protons, number of electrons, number of neutrons, number of valence electrons, the group
number, and the period number.
+
-
#: 19
P
: 19
Ve
: 1
-
Sym: K
e
: 19
Grp: 1
0
Mass: 39
N
: 20
Per: 4
17. Draw a Bohr model of the element Silicon.
18.
+
14 P
0
14 N
DEFINITIONS:
Atom -
smallest particle of an element; cannot be broken down by physical or chemical
•
means
atomic mass –
sum of the # of protons and neutrons found in the nucleus of an atom
•
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