Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CHEMLec > Scientific Measurements > Flashcards

Scientific Measurements Flashcards

1
Q

A collection of quantitative or numerical data that describes a property of an object or event.

A

Measurement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How is a measurement made?

A

By comparing a quantity with a standard unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What unit system is used in chemistry?

A

The International System of Units (SI units)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

SI base unit of length

A

Meter (m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

SI base unit of mass

A

Kilogram (kg)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

SI base unit of temperature

A

Kelvin (K)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

SI base unit of time

A

Second (s or sec)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

SI base unit of amount of substance

A

Mole (mol)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

SI base unit of electric current

A

Ampere (A or amp)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

SI base unit of luminous intensity

A

Candela (cd)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What was the SI system formerly known as?

A

The Metric System

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Internationally adopted decimal system

A

The Metric System

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What converts base units into the units that are appropriate for common usage or appropriate measure?

A

Metric System Prefixes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

A measure of the amount of material in an object

A

Mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the SI base unit of mass and what is its metric system unit?

A

SI=kilogram, Metric=gram

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

A measure of distance

A

Length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the base unit of length?

A

Meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

It is the “hotness and coldness” of an object that determines the direction of heat flow

A

Temperature

19
Q

What is the base unit of temperature?

A

Kelvin

20
Q

How do you convert Kevlin to Celsius?

A

K=C+273.15

21
Q

Celsius scale is based on the properties of ___

A

Water

22
Q

Kelvin scale is based on the properties of ___

A

Gases

23
Q

True or False: There are no negative Kelvin temps.

A

True

24
Q

What is the lowest possible temperature of Kelvin called?

A

Absolute Zero

25
Q

The length of a 20-peso bill is approximately ___ inches

A

6

26
Q

What is the approximate measurement of the tip of your thumb to the first joint?

A

1 inch

27
Q

What is the approximate height of a doorknob to the floor?

A

1 meter

28
Q

Quantities that are calculated form base units

A

Derived units

29
Q

Area and volume conversions are equivalent to ?

A

Length conversion raised to a power

30
Q

A physical property of a substance that consists of dividing an object’s mass by its volume

A

Density (g/mL or g/cm^3)

31
Q

Numbers that are counted or given by definition

A

Exact numbers

32
Q

Numbers that depend on how they were determined (via scientific tools and human observation)

A

Inexact (measured) numbers

33
Q

Why are measured numbers inexact?

A

Scientific instruments have limitations (equipment errors) and individuals can read some tools differently (human error)

34
Q

Which digit is the uncertainty?

A

Last digit

35
Q

Refers to how closely individual measurements agree with the correct, or “true” value

A

Accuracy

36
Q

Refers to the measure of how closely individual measurements agree with one another

A

Precision

37
Q

How do you calculate for the percent error?

A

%error= error in measurement/accepted value*100

38
Q

Low error=?

A

High accuracy

39
Q

How do you calculate for the error in measurement?

A

experimentally determined value - accepted value

40
Q

The measure of how spread out numbers are relative to the average

A

Standard deviation

41
Q

How do you calculate for the Standard Deviation?

A

square root of [ (1/N) times Sigma i=1 to N of (xi - mu)^2 ]

42
Q

Which kinds of numbers have an infinite number of significant figures?

A

Exact and Defined numbers

43
Q

Dimensional analysis is used to ?

A

Change units

CHEMLec (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions