Finals semester 1 Flashcards
(128 cards)
1
Q
how are science and technology related
A
advances in science may lead to advances in technology or vice versa
2
Q
metric unit for mass
A
kilograms
3
Q
building blocks for all matter
A
atoms
4
Q
happens when the data in an investigation do not support original hypothesis
A
hypothesis will be revised
5
Q
true about scientific theorys
A
scientific theories are never proven
6
Q
why are scientific models important
A
help visualize things that are complex, large, or small
7
Q
example of safe lab procedure
A
tying long hair and loose clothing back
8
Q
temperature scale that does NOT have negative temps
A
kelvin
9
Q
in metric system, 1cm (to the 3rd) is equal to one…
A
millilitter
10
Q
clocks that offer the most precision
A
clock that measures time to nearest tenth of a second
11
Q
60 degrees farenheight is equal to ?degrees kelvin
A
289
12
Q
type of graph used to show how a part of something relaes to a wholw
A
circle graph
13
Q
how do sccientisits who speak different languagees make their data understandable to one another
A
they all use SI
14
Q
educated guess would define
A
hypothesis
15
Q
relationship btw manipulated variable and responding variable is a direct proportion what will a line graph of this relationship look like
A
straight line
16
Q
system of knowledge and methods used to find that knowledge
A
science
17
Q
NOT a branch of natural science
A
social science
18
Q
volume is equal to
A
length* width* height
19
Q
in which step of the scientific method is info obtained through the senses
A
making observations
20
Q
statement that summarizes a pattern found in nature
A
scientific law
21
Q
ohysical or mental representation of an object or an event
A
model
22
Q
most important safety rule
A
always follow your teachers instruction and textbook directions exactly
23
Q
how is 0.00025 written in scientific notation
A
2.5* 10(to the negative 4th)
24
Q
equal to 1 cm
A
10mm
25
timers at a swim meet used four different clocks to time event. which recorded time most precise
55.25 sec
26
on celsius scale what temp does water boil
100 degrees
27
what is the relationship in which the ratio of the manipulated variable and the responding variable is constant
direct porportion
28
how do scientists communicate the results of investigations
publishing articles in journals, giving talks, exchanging emails
29
metric unit for volume
liters
30
metric unit for temperature
kelvin
31
volume is defined as the
amount of space taken up
32
boiling point of water on the kelvin temp scale
373 degrees
33
desity is equal to
mass divided by volume
34
the explanation of the pattern in nature is provided by
scientific therory
35
when a scientist measures water 1mL=
gram
36
3.4 times 10 to the third times 2.2 times 10 to the fifth equals
7.48 times 10 to the eighth
37
mixture can be classified as a solution, suspension, or colloid based on the
size of particle
38
you are about to open soy milk and is says to shake well before serving. soy milk is
suspension
39
method can be sed to separated parts of a liquid mixture when the entire mixture can pass through a filter
distillation
40
when physical change in a sample occurs which of the following does NOT change
composition
41
a substance that has high reactivity
easily combined chemically w/ other substances
42
which is a chemical change
water breaking down into hydrogen and oxygen
43
clue of a chemical change
a gas forms when vineger and baking soda are mixed
44
units used to measure density are
grams/ milliter
45
unit of mass
gram
46
which of the following are pure substances
compounds
47
NOT pure substance
milk
48
volume NOT measured in
grams
49
substance that is made up of only one kind of aatoms
element
50
symbol for aluminum
Al
51
symbol for gold
Au
52
formula for density
d=m/v
53
if density of gold is 19.3 g/mL then 2 mL has mass of
38.6g
54
objects sink in water because
they are more dense than water
55
if a material contains three elements joined in a fixed porportion it is a
compound
56
water is a compound because
it can be broken down into simpler substances and always has 2 hydrogen atoms for each oxygen atom
57
density of water
1 g/mL
58
2 mL of lead has amass of 22.6 g the density is
11.3 g/mL
59
which is a mixture
sand
60
volume is
amount of space an object takes up
61
object x has a mass of 1g and a volume of 1 mL. object y is the same substance as x but mas of 5 g. which has greater density
x and y have the same density
62
characteristic of a mixture
has varying properties
63
the density of an object with a mass of 25g and a volume of 5 mL is
5 g/mL
64
a mixture that appaers to contain only one substance is a
homogeneous mixture
65
which is malleable
gold
66
which of the following has highest viscosity
corn syrup
67
among following the unit that is least closely related is
gram
68
a substance has a melting point of 0 degrees celcius . the substance is most likely
water
69
NOT a clue that a chemical change has occured
change in shape
70
ice floats because it is ? dense than water
less
71
in oreder to make an object less dense without changing its mass a person would
increase the volume
72
in order to make an object less dense without changing its mass a person would
decrease
73
in order to make an object less dense without changing its volume a person would
decrease the mass
74
in order to make an object less dense without changing its volume a person would
decrease the mass
75
in order to make an object more dense without changing its volume a person would
increase the mass
76
if a beaker has 40 g and the same beaker has red rock with the mass of 70g the mass of the red rock would be
30 g
77
a graduated cylinder has 13mL and a sphere is placed in water the new water level is 39nmL the volume of the sphere is
26 mL
78
a material that is malleable and conducts electricity is most likely
a metal
79
filtration can be used to separate mixtures based on
size of the particles
80
which of the following is a physical change
sawing a piece of wood in half
81
flammmabillity is a materials abillity to burn in presence of
oxygen
82
air is example of
mixture
83
smallest piece of an element with all the properties of the element is
atom
84
which of the following is a pure substance
water
85
smallest piece of gold
atom
86
smallest piece of water is a
molecule
87
t or f solids have no definite shape and no definite volume
false
88
t ot f perspiration cools the body by means of sublimation
false
89
t or f boyle's law describes the behavior of gasses
true ``
90
t or f the change of a liquid to a gas is vaporization
true
91
t or f matter can only exsist in three phases solid liquid and gas
false
92
t or f an amorphous soilid can be thought of as a slow moving liquid
true
93
t or f according to charles law the volume of a fixed amount of gas varies inversly with temp of gas
false
94
t or f sun contains matter in plasma form
true
95
t or f the change of a substance from a solid to a liquid is called freezing
false
96
t or f the temp must be constant for boyles law to be used
true
97
according to boyles law if the volume of a gas decreased , the
particle collisions within the gas will increase
98
the phase change that is the reverse of condesation
vaporization
99
forces of attraction limit the motion of particles most in
a solid
100
collisions of helium atoms and the walls of a closed container cause
gas pressure
101
the change of a substance from a gas to a liquid is called
condensation
102
the change of a liquid to a solid
freezing
103
when paricles in a closed container are heated they
move faster
104
when substances go directly from the solid phase to the gas phase the phase change is called
sublimation
105
which of the following phase changes is an exothermic change
deposition
106
solids that loose their shape under certain conditions
amorphous
107
which of the following will cause a decrease in gas pressure in a closed container
lowering the temp
108
99% of all matter that can be observed in the universe
plasma
109
porportion is inverse when
one factor increases as the other decreases
110
an example of a substance that sublimes is
dry ice
111
phase change in which a substance changes from a gas directly to a solid
deposition
112
if you move a substance from one container to another and its volume changes the substance is a
gas
113
raising the temp of a gas will increase the pressure if the volume of the gas
and the number of partiicles is constant
114
during a phase change the temp of a substance
remains the same
115
the heat of fusion for h2o is the amount of energy needed for h20 to
melt
116
an example of amorpous solid is
glass
117
a regular repeating arrangement of particles
crystalline solid
118
according to charles law
volume of a gas increases if the temp increases
119
a very high energy phase of matter not found naturally on earth
plasma
120
dry ice is solid
carbon dioxide
121
the heat of vaporization for h2o is the amount of energy needed for h2o
evaporate
122
melting of ice is an example of a
physical change
123
which of the following statements about ice melting is true
water molecules move from their fixed position
124
and example of crystalline solid
table salt
125
which of the following has a definite volume but not a def shape
liquid
126
when a gas leaves the surface of a liquid the liquid
evaporates
127
the gas laws describe the behavior of gasses with changes in pressure volume and
temp
128
boyles law states that the volume of a gas varies ? with the pressure of the gas
inversely
