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Chemistry & Energy
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# Energy
Flashcards
30 cards
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Practice quiz
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Questions
30
Answers
1
In both endothermic and exothermic reactions energy is
released
conserved
absorbed
destroyed
2
In an endothermic reaction energy is
released
absorbed
3
A measurement always has those digits that you are certain of plus one
decimal
estimated
made up
unknown
4
how many sig. figs. whould your answer have ? 1.23cm x 1.2cm x 2.500cm
3
2
1
4
5
The correct number of sig. figs in this value 600m is/are
1
6
3
2
6
A theory or explanation that is based on observations and that can be tested in a(n)
experiment
principle
theory
law
7
All of the components that are being studied at any given time are
the surroundings
a system
the conservation of energy
a transfer of energy
8
A mathematical equation is a
law
hypothesis
theory
statement
9
0.0092 has how many sig. figs.
5
92
2
4
10
a statement that describes a basic fact is a
law
hypothesis
theory
explanation
11
To change a Kelvin temp. to C
0
multiply by 5/9
subtract 273
add 273
divide by 273
12
In an endothermic reaction energy is
conserved
cold
destroyed
changed to matter
13
A logical set of steps used to solve problems is
hypothesis
the scientific method
law
a theory
14
The energy that is transferred between objects at different temperatures is
chemical energy
temperature
heat
potential energy
15
The # of sig. figs. in this measurement 170.050 km is
5
4
3
6
16
A temperature of 323 K is equivalent to
2230 C
- 500 C
500 C
596 0 C
17
A measure of the average kinetic energy of particles in an object is
endothermic
heat
exothermic
temperature
18
The statement that energy cannot be created or destroyed is known as ?
The law conservation of of chemical reactions
The law of conservation of matter
The law of conservation of energy
The law of conservation of mass
19
The amount of energy that is required to raise the temp. of 1g of a substance 1
0
C is
specific energy
specific heat
the same for every substance
temperature
20
400.0 has how many sig. figs?
4
100
3
1
21
A measurement always has some degree of uncertainty.
True
False
22
A factor that could affect the the results of an experiment is
a control
a variable
a mistake
a value
23
What are the units for specific heat?
J
J/g . K
J/g . C0
K
24
Absolute zero is
-276 C
-273 C
273 C
0 C
25
A measurement that is close to the actual value is said to be
correct
percise
right
accurate
26
Poor precision in a measurement may be due to
the ruler
human error
a guess
poor techniques
27
_____________ is a(n) explanation based on many observations and tested hypothesis.
theory
experiment
hypothesis
law
28
A globe is a
diagram
model
ball
map
29
A measurement tells how precise the instrument used to measure is.
True
False
30
The energy of motion is
exothermic
endothermic
potential
kinetic
