Chemistry

Question 1

Chemistry

Answer 1

Composition, interaction ,properties of substances

Question 2

Greeks contribution to chemistry

Answer 2

4 elements

Question 3

How long ago did people try to understand chemistry?

Answer 3

+2500 yrs

Question 4

Alchemist contribution

Answer 4

Turn base metals into noble metals

Question 5

Examples of chemistry

Answer 5

• digestion
• Making polymers
• refining oil

Question 6

Chemistry is based on

Answer 6

Observation and experiments

Question 7

Hypothesis

Answer 7

Explanation of observation

Question 8

Law

Answer 8

Summarize many observations
Predict things
Explain how things happen

Question 9

Theory

Answer 9

Explanation of phenomenon with evidence that is comprehensive
Testable

Question 10

What are the three domains of chemistry

Answer 10

Macroscopic
Microscopic
Symbolic

Question 11

Scientific method

Answer 11

-observation
-hypoyhesis
Experiment
-results
-repeat

Question 12

Liquid

Answer 12

Flows and takes shape of container

Question 13

Gas

Answer 13

Takes volume and shape of container

Question 14

Where can we find plasma?

Answer 14

Stars
Lighting

Television screens

Question 15

Can plasma cut things?

Answer 15

Yes, plasma can cut metal

Question 16

Mass

Answer 16

Amount of matter

Question 17

Weight

Answer 17

Amount of gravity on mass

Question 18

For what types of changes is the law of conservation of matter true?

Answer 18

Physical and chemical

Question 19

How many known elements are there?

Answer 19

100+

Question 20

How many elements occur naturally?

Answer 20

90

Question 21

How many elements were man made?

Answer 21

12

Question 22

Pure substances

Answer 22

Constant composition

Question 23

Elements

Answer 23

Can’t be broken down into simpler components

Question 24

Compounds

Answer 24

Made of 2 or more elements

Question 25

Compounds can be broken down by

Answer 25

Chemical changes

Question 26

Do compounds have different properties than elements?

Answer 26

Yes

Question 27

Mixtures

Answer 27

- 2 or more types of matter - different amounts Separated by physical changes

Question 28

Homogeneous mixtures

Answer 28

Uniform composition Appears the same throughout

Question 29

Synonym for homogeneous mixture

Answer 29

Solution

Question 30

Who thought of the atom?

Answer 30

Leucippus and democritus

Question 31

When did leucippus and democritus think about the atom

Answer 31

5th century

Question 32

How did John Dalton support the idea of atoms

Answer 32

Quantitative measurements

Question 33

Molecule

Answer 33

2 or more atoms connected by chemical bonds

Question 34

Physical properties

Answer 34

No change in chemical composition

Question 35

Examples of physical properties

Answer 35

``` Density Color Hardness Melting and boiling points Electrical conductivity ```

Question 36

Chemical properties

Answer 36

Turning one thing into another | Change in Chemical composition

Question 37

Examples of chemical properties

Answer 37

``` Flammability Toxicity Acidity Reactivity Heat of combustion ```

Question 38

Extensive properties

Answer 38

Depend on the amount of matter present

Question 39

Examples of extensive properties

Answer 39

Mass Volume Heat

Question 40

Intensive properties

Answer 40

Don't depend on the amount of matter present Density Temperature

Question 41

What system is used to measure in chem

Answer 41

SI

Question 42

Base unit of temp

Answer 42

Kelvin K

Question 43

Base unit of length

Answer 43

m

Question 44

Base unit of mass

Answer 44

Kg

Question 45

Base unit of time

Answer 45

S

Question 46

Base unit of electrical current

Answer 46

Ampere A

Question 47

Base unit of amount of substance

Answer 47

Mole m

Question 48

Base unit of luminous intensity

Answer 48

Candela cd

Question 49

Femto

Answer 49

10^-15 | f

Question 50

Pico

Answer 50

10^-12 | p

Question 51

Nano

Answer 51

10^-9 | n

Question 52

Micro

Answer 52

10^-6 | m

Question 53

Mili

Answer 53

10^-3 | m

Question 54

Centi

Answer 54

10^-2 | c

Question 55

Deci

Answer 55

10-1 | d

Question 56

Kilo

Answer 56

K 10^3

Question 57

Mega

Answer 57

M | 10^6

Question 58

Giga

Answer 58

G | 10^9

Question 59

Tera

Answer 59

10^12 | T

Question 60

SI unit of length

Answer 60

m

Question 61

The meter was originally

Answer 61

1/10 million the distance between the north pole and the equator

Question 62

A meter is now

Answer 62

The distance that light travels in a vacuum in 1/ 299,792,458 of a second

Question 63

A meter is approximately

Answer 63

3 inches linger than a yard

Question 64

What was originally the mass of a liter of water

Answer 64

1kg

Question 65

What is a kg defined by

Answer 65

Pt. Ir. Alloy

Question 66

A Kg Is approximately

Answer 66

2.2 lbs

Question 67

Symbol used with kelvin

Answer 67

No degree symbol is used with K

Question 68

C is also allowed in the SI

Answer 68

True

Question 69

Celcius and kelvins have the same magnitude

Answer 69

True

Question 70

Temp of water freezing

Answer 70

0C | 273.15 K

Question 71

Temp of water boiling

Answer 71

100 C | 373.15K

Question 72

SI unit of volume

Answer 72

m3

Question 73

1dm^3=

Answer 73

1L

Question 74

1cm^3

Answer 74

1ml

Question 75

Density is

Answer 75

The ratio of mass over volume

Question 76

Standard Unit of density is

Answer 76

Kg/m^3

Question 77

Measurement free from uncertainty

Answer 77

Counting

Question 78

Result of counting

Answer 78

Exact number

Question 79

Numbers for defined quantities are also exact

Answer 79

True

Question 80

1=12 in

Answer 80

True

Question 81

1in=2.54cm

Answer 81

True

Question 82

1g=.001kg

Answer 82

True

Question 83

Quantities that you get from measurements other than counting are uncertain to varying extents

Answer 83

True

Question 84

Quantities gotten by means other than counting care not exact.

Answer 84

True

Question 85

You can estimate one uncertain digit

Answer 85

True

Question 86

Significant digits

Answer 86

- nonzeroes - captive zeroes - trailing zeroes that are to the right of the decimal place or in scientific notation

Question 87

Insignificant digits

Answer 87

Leading zeroes | Trailing zeroes to the left of the decimal

Question 88

The results are as precise as the numbers used to calculate them

Answer 88

True

Question 89

When adding or subtracting

Answer 89

We round to the same number of digits as the least precise number

Question 90

When multiplying or diving we round to

Answer 90

The number with the least significant figures

Question 91

Dropping and rounding rules

Answer 91

-5 down 5+ up 5 up or down to make even

Question 92

Similar

Answer 92

Close to results

Question 93

Accurate

Answer 93

Close to expected value

Question 94

At how many degrees Fahrenheit does water freeze?

Answer 94

32⁰F

Question 95

At how many degrees F does water boil?

Answer 95

212⁰F

Question 96

Kelvin scale is based on absolute temperature

Answer 96

True

Question 97

TF=((9f/5c)xTc)+32

Answer 97

Celcius to Fahrenheit

Question 98

Kelvin to celcius

Answer 98

TK=TC+273.15