Fall Semester Final Exam - Chemistry Review Worksheet - 8th Grade Page 4
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433.
Describe two physical changes and two chemical changes that occur in the human digestive system.
(7G p.384) Physical: _________________________________________________________________
Chemical: ________________________________________________________________________
34.
Describe the direction of energy flow in a food web or energy pyramid. (7G: pp.562-65) ____________
_________________________________________________________________________________
35.
For each of the following elements, list the symbol (S), atomic number (A.N.), atomic mass (A.M.),
number of protons (P), neutrons (N) and electrons (E), number of electron shells (E.S.) and number of
valence electrons (V.E.).(7G: p.62)
Element
S
A.N.
A.M.
P
N
E
E.S.
V.E.
Sodium
_______
________
________
___
___
___
______
_____
Hydrogen
_______
________
________
___
___
___
______
_____
Oxygen
_______
________
________
___
___
___
______
_____
Carbon
_______
________
________
___
___
___
______
_____
36.
How many atoms are in one molecule of C
H
O
? ______________________________________
6
12
6
How many atoms are there for each element? C:_____ H: _____ O: _____ (pp.94-95)
37.
What is the law of conservation of mass? (p.94) _________________________________________
________________________________________________________________________________
38.
In a balanced chemical reaction, the mass of the _______________________________ equals the mass
of the _____________________________. In other words, there are the same number and kind of
atoms on both sides of the chemical equation. (pp.94-95)
39.
In the chemical equation 6H
O + 6CO
C
H
O
+ 6O
, what are the reactants? (p.92) __________
2
2
6
12
6
2
_______________________ What are the products? ______________________________ How many
total atoms are involved in this reaction? ________ (Hint: Only count one side of the equation)
40.
Is each of the following chemical equations balanced? (Hint: An equation must be balanced because of
3
the law of conservation of mass.)(pp.95-96)
Al + CuCl
AlCl
+ Cu
_____________
2
2H
O
2H
+ O
____________
4Fe + 3O
2Fe
O
_____________
2
2
2
2
2
3
6HCl + 2Al
2AlCl
+ 3H
___________
2HCl + NaOH
4NaCl + H
O _____________
3
2
2
41.
What is the formula for density? (p.141) ________________________________________________
3
3
If a rock has a mass of 90 g and a volume of 30 cm
, what is the density of the rock, in g/cm
?
____________________________
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