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General Chemistry > Physical Quantities & Units > Flashcards

Physical Quantities & Units Flashcards

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1
Q

A property of a material or system that can be obtained and quantified by measurement indicating the appropriate base and unit

A

Physical Quantity

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2
Q

Can be expressed as a value consists of numerical magnitude and the unit in which it is measure: 3.9 grams, 50.0 dL, 19.3g/cm³

A

Physical Quantity

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3
Q

can be expressed as a value of certain unit: grams, kilograms, or pounds

A

Physical Quantity

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4
Q

An operation by which an unknown physical quantity is compared with a known quantity based on standard

A

Measurement

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5
Q

Using your idea of something similar in size or amount to determine the size of the new object

A

Estimation

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6
Q

Helps to make a rough measurement of an object

A

Estimation

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7
Q

Useful when you are in a hurry and exact numbers are not required

A

Estimation

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8
Q

how close a measurement is to the true value

A

Accuracy

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9
Q

Is comparison of a measurement to the actual or accepted value

A

Accuracy

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10
Q

how close the measurements are to each other (reproducibility)

A

Precision

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11
Q

the correct value based on reliable references or the physical quantities with fixed values
Example: density & specific heat capacity

A

Accepted value

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12
Q

the value obtained in lab experimentations

A

Experimental value

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13
Q 
accepted value - exp. value
Can be (+) or (-)
A

Error

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14
Q

the absolute value of the error divided by the accepted value, then multiplied by 100%

A

Percent error

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15
Q

Le Systeme International d’Unites

A

SI system

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16
Q

True or False:
All measurement systems have standards. Standards are exact quantities that everyone agrees to use as a basis of comparison.

A

True

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17
Q

Why does the rest of the world uses SI System?

A

The SI (International System of Units) system is the form of measurement typically used by scientists.

  • Measurements are easily understood by all scientists
  • Measurements are easier to convert than the English system
  • There are 7 SI base units
  • From these bae units, all other SI units of measurement can be derived.
  • Derived units are used for measurements such as volume, density, and pressure.
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18
Q

SI stands for?

A

International System of Units

19
Q

What are the commonly used physical quantities?

A
  1. Length
  2. Volume
  3. Mass
  4. Density
  5. Temperature
  6. Time
20
Q

The SI system is based on the number _?

A

10

21
Q

SI Unit of length

A

ft, m, cm

22
Q

SI unit of mass

A

kg, g

23
Q

SI unit of volume

A

m³, liter

24
Q

SI unit of density

A

kg/m³

25
Q

SI unit of temperature

A

K, C

26
Q

SI unit of time

A

s

27
Q

are exact quantities that everyone agrees to use as a basis of comparison

A

Standards

28
Q

the distance between two points

A

Length

29
Q

basic unit of length in the SI System

A

Meter

30
Q

a variation of a length measurement

A

Area

31
Q

a measurement of the amount of space something takes up

A

Volume

32
Q

Basic unit of volume

A

Liter

33
Q

Objects without a definite length, width or height, can use w__ d_____ to determine volume.

A

water displacement

34
Q

a measurement of the amount of matter in an object

A

Mass

35
Q

how much matter is in something (mass), compared to the amount of space it takes up (volume)

A

Density

36
Q

a measure of the kinetic energy of the atoms in an object

A

Temperature

37
Q

True or False:
The specific gravity of a substance is the density of this substance divided by the density of water, which is 1.00 g/mL.
Unitless quantity

A

True

38
Q

A widely used technique for such conversions using the rules of algebra

A

Factor-label method/ unit-factor method/ Dimensional Analysis

39
Q

The ratio of the mass of an object to its volume

A

Density

40
Q

An intensive property that depends only on the composition of a substance, not the size of the sample

A

Density

41
Q

measures the volume of an irregularly shaped object

A

Water Displacement Method

42
Q

When mass is measured in grams, and volume in cubic centimeters, the unit of density then is?

A

grams per cubic centimeter (g/cm³)

43
Q

True or False:
The volume of substances will change with temperature, so accurate volume-measuring devices are calibrated at a given temperature

A

True

44
Q

For large distances, it is most appropriate to express measurements in?

A

km

General Chemistry (6 decks)

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