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Chemistry I > Chapter 1.4 Units of Measurement > Flashcards

Chapter 1.4 Units of Measurement Flashcards

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1
Q

Quantitative

A

Refers to the many properties of matter associated with numbers

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2
Q

SI

A

Are the preferred units of the metric system

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3
Q

Prefixes of the metric system in order of largest to smallest

A 
From large to small ( multiply by 10)
From small to large ( divide by 10)
Giga    10^ 9
Mega.  10 ^6
Kilo.     10^3
Deca    10^2
Base
Deci.    10^-1. .1
Centi.   10^-2. .01
Milli.     10^-3. .001
Micro.  10^-6
nano     10^ -9

( GIGA/nano) multiple of 9
( Mega/ Micro) multiple of 6

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4
Q

The 7 base units are ( from which other units are derived

A
  1. Mass Kilogram kg
  2. Length. Meter m
  3. Time. Second. s or sec
  4. Temp. Kelvin. K
  5. Amt of sub. Mole. mol
  6. Electric curr. Ampere. A or amp
  7. Luminous intensity /Candela / Cd
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5
Q

UNIT

A

Is what specifies a measurement/quantity

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6
Q

WEIGHT

A

is the force that is exerted on an object’s mass by gravity

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7
Q

TEMPERATURE

A

Is the measure of the hotness or coldness of an object.

. It is a physical property that determines the direction of heat flow.

. A measure of the kinetic energy of the particles in a sample

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8
Q

How does heat flow

A

It flows spontaneously from a substance from higher temperature to lower temperature.

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9
Q

The 2 scales used to measure temperature are

A
  1. Kelvin

2. Celsius

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10
Q

Freezing and boiling points on a Celsius scale

A

Freezing 0 degrees C = 273.15 Kelvins

Boiling 100 degrees C

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11
Q

Freezing and boiling points on a kelvin scale

A

0 degrees K = -273.15 deg. C = ABSOLUTE ZERO

Boiling: 373.15

Kelvin scale is based on the properties of gases

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12
Q

KELVIN TO CELSIUS

A

C= K -273.15

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13
Q

Conversion Celsius to Kelvin

A

K = C+ 273.15

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14
Q

ABSOLUTE ZERO

A

0 degrees K = -273.15 deg. C

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15
Q

Freezing and boiling points on a fahrenheit scale

A

Freezing : 32 F

Boils : 212 F

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16
Q

Fahrenheit to Celsius

A

C= 5/9( F-32)

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17
Q

Celsius to Fahrenheit

A

F= 9/5 (C)+ 32

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18
Q

DERIVED UNITS

A

SI base units are use to get DERIVED UNITS

To do so we use the defining equation for the quantity, substituting the appropriate base units

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19
Q

the defining equation for SPEED

A

ratio: distance traveled / elapsed time = m/s ( meters per second) = a derived unit

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20
Q

2 egs of a derived unit

A

volume=L ( not a based unit/not a SI unit)

Density=

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21
Q

VOLUME OF A CUBE

A

l x l x l = length^3 = m^3 ( a derived unit formed from the base unit for length -> meter)

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22
Q

Volume units

A

m3
cc/ cm3
L= decimeter cubed dm3
1cm3=1ml

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23
Q

Mass

A

Is a measure of the amount of material in an object

24
Q

What units is density expressed

A

g/cm3 or g/ml

25
Q

DENSITY

A

the amount of mass in a unit volume of substance ( which is temperature dependent- volume changes when a substance is heated or cooled)

MASS/ VOLUME

EXPRESSED IN GRAMS =g/ml

It is a intensive physical property

For a liquid it is g/ ml
For a solid it is g/ cm3

26
Q

1ml=

A

1cm3

27
Q

HYPOTHESIS

A

TENTATIVE explanation

28
Q

The density of water is

A

1.00g/ml

29
Q

SCIENTIFIC LAW

A

A concise verbal statement or mathematical equation that summarizes a broad variety of observations and experiences.

they are considered to be the basic rules under which nature operates

30
Q

THEORY

A

if a hypothesis is sufficiently general and repeatedly effective in predicting results of future experiments, it is called a theory.

  1. It is an explanation of the general causes of certain phenomena with considerable evidence or facts to support it.

threes can never be proven only supported

31
Q

WEIGHT

A

is the force that is exerted on an object’s mass by gravity

32
Q

UNIT

A

Is what specifies a measurement/quantity

33
Q

How does heat flow

A

It flows spontaneously from a substance from higher temperature to lower temperature.

34
Q

TEMPERATURE

A

Is the measure of the hotness or coldness of an object.

. It is a physical property that determines the direction of heat flow.

35
Q

Freezing and boiling points on a Celsius scale

A

Freezing 0 degrees C = 273.15 Kelvins

Boiling 100 degrees C

36
Q

The 2 scales used to measure temperature are

A
  1. Kelvin

2. Celsius

37
Q

KELVIN TO CELSIUS

A

C= K -273.15

38
Q

Freezing and boiling points on a kelvin scale

A

0 degrees K = -273.15 deg. C = ABSOLUTE ZERO

39
Q

ABSOLUTE ZERO

A

0 degrees K = -273.15 deg. C

40
Q

Conversion Celsius to Kelvin

A

K = C+ 273.15

41
Q

Fahrenheit to Celsius

A

C= 5/9( F-32)

42
Q

Freezing and boiling points on a fahrenheit scale

A

Freezing : 32 F

Boils : 212 F

43
Q

DERIVED UNITS

A

SI base units are use to get DERIVED UNITS

To do so we use the defining equation for the quantity, substituting the appropriate base units

44
Q

Celsius to Fahrenheit

A

F= 9/5 (C)+ 32

45
Q

2 egs of a derived unit

A

volume=L ( not a based unit/not a SI unit)

Density=

46
Q

the defining equation for SPEED

A

ratio: distance traveled / elapsed time = m/s ( meters per second) = a derived unit

47
Q

Volume units

A

m3
cc/ cm3
L= decimeter cubed dm3
1cm3=1ml

48
Q

VOLUME OF A CUBE

A

l x l x l = length^3 = m^3 ( a derived unit formed from the base unit for length -> meter)

49
Q

What units is density expressed

A

g/cm3 or g/ml

50
Q

DENSITY

A

the amount of mass in a unit volume of substance ( which is temperature dependent- volume changes when a substance is heated or cooled)

MASS/ VOLUME

EXPRESSED IN GRAMS =g

51
Q

1ml=

A

1cm3

52
Q

The density of water is

A

1.00g/ml

53
Q

THEORY

A

if a hypothesis is sufficiently general and repeatedly effective in predicting results of future experiments, it is called a theory.

  1. It is an explanation of the general causes of certain phenomena with considerable evidence or facts to support it.

threes can never be proven only supported

54
Q

HYPOTHESIS

A

TENTATIVE explanation

55
Q

A liter is

A

A cube 1 decimeter long on each side

1 L = dm3

56
Q

SCIENTIFIC LAW

A

A concise verbal statement or mathematical equation that summarizes a broad variety of observations and experiences.

they are considered to be the basic rules under which nature operates

57
Q

A Mililiter

A

Is a cube 1 cm long on each side

Chemistry I (33 decks)

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