Forms Of Energy Page 3
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1
2
3Choose the letter of the best answer.
Teachers can monitor student progress and
What is the best title for the chart below?
5.
The fact that matter is neither created nor
1.
supply remediation when necessary.
destroyed in any chemical or physical change is
Chemical Properties of Some Compounds
A
called the
Physical Properties of Some Elements
B
law of exothermic change.
A
C
The Periodic Table of the Elements
B
law of endothermic change.
Standards Practice
Gases Found in Air
D
S
8.3.b
law of thermal change.
C
law of conservation of matter.
1.
B;
S
8.3.b
D
S
8.5.b
?
C;
2.
S
8.5.b
6.
How would you classify the burning of natural
Helium
Colorless; less dense than air
gas?
3.
A;
S
8.3.b
exothermic chemical change
A
Iron
Attracted to a magnet;
A;
4.
S
8.5.c
melting point of 1,535°C
B
endothermic chemical change
5.
D;
S
8.5.b
exothermic physical change
C
Oxygen
Odorless; gas at room temperature
6.
A;
S
8.5.c
D
endothermic physical change
S
8.5.c
C;
7.
S
8.3.b
7.
Which diagram best represents a mixture of
A scientist did an experiment, described by
two kinds of gas molecules?
the words and symbols below. Use the
S
8.3.b
information to answer Questions 2 to 4.
→
hydrogen
oxygen
water
energy
8.
Sample answer: In a physical change, such
2.
The scientist found that 2 grams of hydrogen
as melting or freezing, water remains the
reacted completely with 16 grams of oxygen.
same substance: the compound H
O. In a
What was the total mass of water produced?
2
A
B
chemical change, such as electrolysis, a
8 grams
18 grams
A
C
reaction produces products with different
14 grams
32 grams
B
D
properties than the compound H
O.
S
8.5.b
2
S
8.3.b
The properties of the water produced by the
3.
reaction are
C
D
different from the properties of both
A
hydrogen and oxygen.
the same as the properties of both hydrogen
B
and oxygen.
C
the same as the properties of hydrogen, but
Water is a compound with the chemical
8.
different from the properties of oxygen.
formula H
O. Compare a physical change
D
the same as the properties of oxygen, but
2
involving water with a chemical change
different from the properties of hydrogen.
involving water. How do the changes differ?
S
8.3.b
S
8.3.b
Which pair of terms best describes the type of
4.
change that occurred in the reaction?
chemical and exothermic
A
chemical and endothermic
B
C
physical and exothermic
physical and endothermic
D
S
8.5.c
◆ 83
Chapter 2
S
8.3.b
Performance Assessment As students
Teaching Resources
Students should identify changes that were
complete their observations and compile a
easy to observe and classify as well as those
Laboratory Manual TE
list, have them identify common
that were difficult. Students should give an
• Standards Investigation Scoring Rubric
observations and make sure they classified
example of a change they had trouble
observations in the same way. It may help to
analyzing.
The Standards Investigation Scoring Rubric
have volunteers make a poster or a large data
will help you evaluate students’ work. If you
table on the board for students to fill in.
shared the rubric in advance, students will
know what is expected of them.
83
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