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Chem Unit 1
Chem Unit 1
99 terms
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Answers
1
a conversion factor is the ratio between diff. units of measurements
True
False
2
im too lazy to put examples of metric conversions so do practice problems
ok
no
3
pure substances contain:
an atom or compound
more than one substance
4
left never, middle always, right sometimes
False
True
5
what is directly proportional? what’s the equation?
two variable where if divided by each other, they give you a constant value
a/b = 2
ab = 2
two variable where if mult. by each other, they give you a constant value
6
0’s are always significant
False
True
7
how many base units are there
5
6
infinity
7
8
giga
10^6
10^9
9
micro
10^-9
10^-6
10
what does mol measure
amount
time
current
temp.
11
what are the two types of research?
technology and books
technology and applied
quantitative and qualitative
basic and applied
12
matter is always classified as
a pure substance
a mixture
both
13
a hypothesis should change
True
False
14
kilo
10^3
10^9
15
what are graphs used for?
all of the above
to show data
to infer a relationship between two variables
display a relationship between two variables
16
milli
10^-3
10^-2
17
intensive properties def. and example
volume
doesn’t depend on matter
boiling point
depends upon matter
18
matter is anything that has mass and takes up space
False
True
19
if your conclusion doesn’t support your hypothesis you restart with a new hypothesis
False
True
20
what’s a qualitative observation?
description
numerical value
21
if measurements are precise they must be accurate
False
True
22
what is natural science?
a science that explains human behavior
science that explains living things
a science that explains all non living things
a science that explains how the universe works
23
what is quantitative observation?
description
numerical value
24
what is basic research?
going into extensive research to know everything about it
learning just the basics
research done to increase knowledge
research done to solve a problem
25
there is always a change in energy when a physical or chemical change occurs
True
False
26
what is an example of a model?
all of the below
math expression
physical object
event
27
what are the two types of observation?
basic and quantitative
basic and applied
qualitative and quantitative
applied and quantitative
28
what is a conclusion?
tells you if you are right or wrong
tells you if you messed up
relates the data to the hypothesis
29
which variable is changed?
dependent
independent
30
what is an observation?
seeing something and recording
recording everything you see during a lab
using you senses to obtain info
something you noticed in a lab
31
gas has neither definite
True
False
32
scientific laws can be directly tested
False
True
33
the student finds the density of a substance to be 1.4 */mL the correct value is 1.3 (find percent of error)
5%
6%
8%
7%
34
which variable is measured from the experiment
dependent
independent
35
what is applied research?
learning just the basics
research done to increase knowledge
going into extensive research to know everything about it
research done to solve a problem
36
every measurement has how many uncertain digits
1
0
37
what does kelvin measure?
time
brightness
temp.
mass
38
scientific theories can be directly tested
True
False
39
chemical properties
occurs when new substance forms
doesn’t change the identity of the substance
substances ability to change into new substance
40
what is a model?
an attempt at explaining a scientific phenomenon
it’s the other one
41
1,200 - 947 = (in scientific notation)
2.53e4
2.53e3
2.53e-3
2.53e2
42
what things do we do to attempt to explain the world around us?
infer, experiment, retest, measure
share, hypothesis, conclusion
observe, infer, experiment, share, retest
measure, experiment, graph
43
what is social science?
science that explains living things
a science that explains all non living things
a science that explains how the universe works
a science that explains human behavior
44
go practice sig fig problems, im too lazy to put them on here :)
okie dokie
Raegan is the coolest person ever😎
will do
45
the total amount of energy will always stay the same through changes
True
False
46
graphs have an x and y axis
True
False
47
mega
10^6
10^9
48
conclusion either supports or doesn’t support hypothesis
False
True
49
what are results?
the outcome of an experiment
observations from the experiment
all of the above
the data measured directly from the experiment
50
write all the base units and what the measure on a piece of paper from memory
don’t be lazy
do it
51
what does meter measure?
distance
time
current
amount
52
how many variables are changed in a controlled experiment?
3
1
2
infinity
53
what do seconds measure
time
temp.
mass
amount
54
what is the conversion factor for ounces to pounds
1/16
16/1
55
what is a scientific theory?
a broad generalization that attempts to explain observation
a statement that describes observation of repeated experimentation
56
what are physical changes
doesn’t change the identity of the substance
can be observed without changing the substance
57
heterogeneous
uniform throughout
differ throughout
58
how do you display results
graphs
charts
all of the above
59
derived units are a combination of base units
True
False
60
112,000 + 4,500 = (in scientific notation)
1.165e8
1.165e5
1.165e-7
1.165e7
61
1-9 are never significant
True
False
62
what does ampere measure?
mass
brightness
temp.
current
63
what does kilogram measure?
brightness
temp.
amount
mass
64
(Atom, molecule, element, or compound) H
E
M
C
A
65
what is inversely proportional? what is the equation?
ab = 2
a/b = 2
two variable where if mult. by each other, they give you a constant value
two variable where if divided by each other, they give you a constant value
66
pure substances have a fixed composition
True
False
67
solids are definite shape and volume
True
False
68
extensive property def. and example
depends upon the matter
volume
boiling point
doesn’t depend on the amount of matter
69
8,000,000,000 / 2,000 = (in scientific notation)
4e4
4e6
4e-7
4e-8
70
homogeneous is
differ throughout
uniform throughout
71
what is a scientific law
a broad generalization that attempts to explain observation
a statement that describes observation of repeated experimentation
72
chemical changes
substances ability to change into new substance
doesn’t change the identity of the substance
occurs when new substance forms
73
a plasma is:
so atoms lose electrons
all of the above
an extremely high temp.
74
what does candela measure?
current
temp.
brightness
distance
75
what is the percentage error equation
(experimental - actual) / experimental
(experimental - actual) / actual
76
if measurements are accurate they must be precise
False
True
77
what are the three branches of natural science?
biological, physical, chemistry
analytical, chemistry, organic
thermodynamics, biological, physical
organic, analytical, biological
78
centi
10^2
10^-2
79
what is .00000079 in scientific notation
7.9e-7
7.9e7
7.9e-5
7.9e5
80
what are the branches of chemistry?
biological, thermodynamics, organic
physical, analytical, thermodynamics, organic
thermodynamics and organic
biological, organic, analytical, thermodynamics
81
H2O
A
E
M
C
82
what is precision
closeness of a set of measurements to one another
how close it is to the actual value
83
why only change on variable?
all of the above
to make it an easier lab
to make better observations
to show cause and effect
84
how many eggs are in 5 cartons (unit conversion)
60
55
62
51
85
what is 419,000,000 in scientific notation?
4.19e8
4.19e6
4.19e10
4.19e9
86
a mixture contains:
more than one substance
an atom or compound
87
0.000000025 x 0.000003 = (in scientific notation)
7.5e14
7.5e13
7.5e15
7.5e-14
88
what is research?
informing yourself on a phenomenon
detailed investigation on a phenomenon
staying up till 3 am for a reading project
reading up on a topic
89
what is a hypothesis?
a question that attempts to explain an observation
an educated guess that attempts to explain an observation
an observation that leads to a question
a statement about your experiment
90
nano
10^-9
10^-3
91
what is science?
an attempt to explain the world around us
study of all living things
an explanation to everything in the universe
a school subject
92
what are physical properties?
doesn’t change the identity of the substance
can be observed without changing the substance
93
liquids have definite shape
True
False
94
observation, hypothesis, experimentation, results, and conclusion are all steps of what?
lab method
experiment method
the si system
scientific method
95
what are the two types of science?
biology and chemistry
natural and sociology
social and natural
physics and natural
96
what is accuracy?
closeness of a set of measurements to one another
how close it is to the actual value
97
how are hypotheses tested?
by conducting an experiment and lab
by conducting a lab
by conducting an one value experiment
by conducting a controlled experiment
98
O2
M
E
C
A
99
the last digit is always rounded
False
True
