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Intro Phys/Chem > Finals semester 1 > Flashcards

Finals semester 1 Flashcards

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1
Q

how are science and technology related

A

advances in science may lead to advances in technology or vice versa

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2
Q

metric unit for mass

A

kilograms

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3
Q

building blocks for all matter

A

atoms

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4
Q

happens when the data in an investigation do not support original hypothesis

A

hypothesis will be revised

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5
Q

true about scientific theorys

A

scientific theories are never proven

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6
Q

why are scientific models important

A

help visualize things that are complex, large, or small

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7
Q

example of safe lab procedure

A

tying long hair and loose clothing back

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8
Q

temperature scale that does NOT have negative temps

A

kelvin

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9
Q

in metric system, 1cm (to the 3rd) is equal to one…

A

millilitter

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10
Q

clocks that offer the most precision

A

clock that measures time to nearest tenth of a second

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11
Q

60 degrees farenheight is equal to ?degrees kelvin

A

289

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12
Q

type of graph used to show how a part of something relaes to a wholw

A

circle graph

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13
Q

how do sccientisits who speak different languagees make their data understandable to one another

A

they all use SI

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14
Q

educated guess would define

A

hypothesis

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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

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16
Q

system of knowledge and methods used to find that knowledge

A

science

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17
Q

NOT a branch of natural science

A

social science

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18
Q

volume is equal to

A

length* width* height

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19
Q

in which step of the scientific method is info obtained through the senses

A

making observations

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20
Q

statement that summarizes a pattern found in nature

A

scientific law

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21
Q

ohysical or mental representation of an object or an event

A

model

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22
Q

most important safety rule

A

always follow your teachers instruction and textbook directions exactly

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23
Q

how is 0.00025 written in scientific notation

A

2.5* 10(to the negative 4th)

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24
Q

equal to 1 cm

A

10mm

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25
Q

timers at a swim meet used four different clocks to time event. which recorded time most precise

A

55.25 sec

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26
Q

on celsius scale what temp does water boil

A

100 degrees

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27
Q

what is the relationship in which the ratio of the manipulated variable and the responding variable is constant

A

direct porportion

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28
Q

how do scientists communicate the results of investigations

A

publishing articles in journals, giving talks, exchanging emails

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29
Q

metric unit for volume

A

liters

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30
Q

metric unit for temperature

A

kelvin

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31
Q

volume is defined as the

A

amount of space taken up

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32
Q

boiling point of water on the kelvin temp scale

A

373 degrees

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33
Q

desity is equal to

A

mass divided by volume

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34
Q

the explanation of the pattern in nature is provided by

A

scientific therory

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35
Q

when a scientist measures water 1mL=

A

gram

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36
Q

3.4 times 10 to the third times 2.2 times 10 to the fifth equals

A

7.48 times 10 to the eighth

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37
Q

mixture can be classified as a solution, suspension, or colloid based on the

A

size of particle

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38
Q

you are about to open soy milk and is says to shake well before serving. soy milk is

A

suspension

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39
Q

method can be sed to separated parts of a liquid mixture when the entire mixture can pass through a filter

A

distillation

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40
Q

when physical change in a sample occurs which of the following does NOT change

A

composition

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41
Q

a substance that has high reactivity

A

easily combined chemically w/ other substances

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42
Q

which is a chemical change

A

water breaking down into hydrogen and oxygen

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43
Q

clue of a chemical change

A

a gas forms when vineger and baking soda are mixed

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44
Q

units used to measure density are

A

grams/ milliter

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45
Q

unit of mass

A

gram

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46
Q

which of the following are pure substances

A

compounds

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47
Q

NOT pure substance

A

milk

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48
Q

volume NOT measured in

A

grams

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49
Q

substance that is made up of only one kind of aatoms

A

element

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50
Q

symbol for aluminum

A

Al

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51
Q

symbol for gold

A

Au

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52
Q

formula for density

A

d=m/v

53
Q

if density of gold is 19.3 g/mL then 2 mL has mass of

A

38.6g

54
Q

objects sink in water because

A

they are more dense than water

55
Q

if a material contains three elements joined in a fixed porportion it is a

A

compound

56
Q

water is a compound because

A

it can be broken down into simpler substances and always has 2 hydrogen atoms for each oxygen atom

57
Q

density of water

A

1 g/mL

58
Q

2 mL of lead has amass of 22.6 g the density is

A

11.3 g/mL

59
Q

which is a mixture

A

sand

60
Q

volume is

A

amount of space an object takes up

61
Q

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

A

x and y have the same density

62
Q

characteristic of a mixture

A

has varying properties

63
Q

the density of an object with a mass of 25g and a volume of 5 mL is

A

5 g/mL

64
Q

a mixture that appaers to contain only one substance is a

A

homogeneous mixture

65
Q

which is malleable

A

gold

66
Q

which of the following has highest viscosity

A

corn syrup

67
Q

among following the unit that is least closely related is

A

gram

68
Q

a substance has a melting point of 0 degrees celcius . the substance is most likely

A

water

69
Q

NOT a clue that a chemical change has occured

A

change in shape

70
Q

ice floats because it is ? dense than water

A

less

71
Q

in oreder to make an object less dense without changing its mass a person would

A

increase the volume

72
Q

in order to make an object less dense without changing its mass a person would

A

decrease

73
Q

in order to make an object less dense without changing its volume a person would

A

decrease the mass

74
Q

in order to make an object less dense without changing its volume a person would

A

decrease the mass

75
Q

in order to make an object more dense without changing its volume a person would

A

increase the mass

76
Q

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

A

30 g

77
Q

a graduated cylinder has 13mL and a sphere is placed in water the new water level is 39nmL the volume of the sphere is

A

26 mL

78
Q

a material that is malleable and conducts electricity is most likely

A

a metal

79
Q

filtration can be used to separate mixtures based on

A

size of the particles

80
Q

which of the following is a physical change

A

sawing a piece of wood in half

81
Q

flammmabillity is a materials abillity to burn in presence of

A

oxygen

82
Q

air is example of

A

mixture

83
Q

smallest piece of an element with all the properties of the element is

A

atom

84
Q

which of the following is a pure substance

A

water

85
Q

smallest piece of gold

A

atom

86
Q

smallest piece of water is a

A

molecule

87
Q

t or f solids have no definite shape and no definite volume

A

false

88
Q

t ot f perspiration cools the body by means of sublimation

A

false

89
Q

t or f boyle’s law describes the behavior of gasses

A

true ``

90
Q

t or f the change of a liquid to a gas is vaporization

A

true

91
Q

t or f matter can only exsist in three phases solid liquid and gas

A

false

92
Q

t or f an amorphous soilid can be thought of as a slow moving liquid

A

true

93
Q

t or f according to charles law the volume of a fixed amount of gas varies inversly with temp of gas

A

false

94
Q

t or f sun contains matter in plasma form

A

true

95
Q

t or f the change of a substance from a solid to a liquid is called freezing

A

false

96
Q

t or f the temp must be constant for boyles law to be used

A

true

97
Q

according to boyles law if the volume of a gas decreased , the

A

particle collisions within the gas will increase

98
Q

the phase change that is the reverse of condesation

A

vaporization

99
Q

forces of attraction limit the motion of particles most in

A

a solid

100
Q

collisions of helium atoms and the walls of a closed container cause

A

gas pressure

101
Q

the change of a substance from a gas to a liquid is called

A

condensation

102
Q

the change of a liquid to a solid

A

freezing

103
Q

when paricles in a closed container are heated they

A

move faster

104
Q

when substances go directly from the solid phase to the gas phase the phase change is called

A

sublimation

105
Q

which of the following phase changes is an exothermic change

A

deposition

106
Q

solids that loose their shape under certain conditions

A

amorphous

107
Q

which of the following will cause a decrease in gas pressure in a closed container

A

lowering the temp

108
Q

99% of all matter that can be observed in the universe

A

plasma

109
Q

porportion is inverse when

A

one factor increases as the other decreases

110
Q

an example of a substance that sublimes is

A

dry ice

111
Q

phase change in which a substance changes from a gas directly to a solid

A

deposition

112
Q

if you move a substance from one container to another and its volume changes the substance is a

A

gas

113
Q

raising the temp of a gas will increase the pressure if the volume of the gas

A

and the number of partiicles is constant

114
Q

during a phase change the temp of a substance

A

remains the same

115
Q

the heat of fusion for h2o is the amount of energy needed for h20 to

A

melt

116
Q

an example of amorpous solid is

A

glass

117
Q

a regular repeating arrangement of particles

A

crystalline solid

118
Q

according to charles law

A

volume of a gas increases if the temp increases

119
Q

a very high energy phase of matter not found naturally on earth

A

plasma

120
Q

dry ice is solid

A

carbon dioxide

121
Q

the heat of vaporization for h2o is the amount of energy needed for h2o

A

evaporate

122
Q

melting of ice is an example of a

A

physical change

123
Q

which of the following statements about ice melting is true

A

water molecules move from their fixed position

124
Q

and example of crystalline solid

A

table salt

125
Q

which of the following has a definite volume but not a def shape

A

liquid

126
Q

when a gas leaves the surface of a liquid the liquid

A

evaporates

127
Q

the gas laws describe the behavior of gasses with changes in pressure volume and

A

temp

128
Q

boyles law states that the volume of a gas varies ? with the pressure of the gas

A

inversely

Intro Phys/Chem (1 decks)

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