Unit 1: Chemistry And Measurement

Front 1

Experiment

Back 1

under specific conditions nature is explored and observations are made according to a designed strategy

Front 2

hypothesis

Back 2

based on results of experiment a proposal for a scientific principle is suggested

Front 3

theory

Back 3

model that explains the behavior of nature and provides a tested explanation of basic natural events

Front 4

natural law

Back 4

does not ex-plain the behavior of nature but rather states a quantifiable relationship

Front 5

matter

Back 5

general term to describe anything that occupies space and can be perceived by the sense

Front 6

mass

Back 6

the quantity of matter in a substance

Front 7

physical change

Back 7

a change in the form of matter but not in its chemical identity

Front 8

chemical change

Back 8

1+ types of matter is converted into a separate type of matter

Front 9

physical properties

Back 9

characteristic that can be observed for a material without changing its physical identity

Front 10

chemical properties

Back 10

characteristic of a material involving a chemical change

Front 11

substance

Back 11

type of matter that cannot be separated into othe rkinds of matter by any physical means

Front 12

substances can be classified as

Back 12

elements and compounds

Front 13

elements

Back 13

substance that cannot be decomposed by any chemical means into a simpler substance

Front 14

compound

Back 14

substance that is composed of 2+ elements chemically combined

Front 15

mixture

Back 15

material that can be separated by a physsical means into 2+ substances

Front 16

Heterogeneous

Back 16

mixtures that consists of physically distinct parts each dissimilar properties

Front 17

homogeneous

Back 17

mixture that has uniform properties throughout the sample

Front 18

Measurement

Back 18

comparison of a physical quantity to be evaluated with a unit

Front 19

precision

Back 19

the proximity of a set of values obtained from identical measurements of a quantity

Front 20

accuracy

Back 20

the closeness of a single measurement to its true value

Front 21

significant figures

Back 21

those digits in a measured number that include all certain digits plus one final digit having some uncertainty

Front 22

Sig figs 1) all digits are significant except for leading zeros(at the begining) and possibly terminal zeros

Back 22

3.14cm, 0.314cm, 0.000314cm all have 3 sig figs

Front 23

sig figs 2) terminal zeros ending at the right of a decimal points are significant

Back 23

3.140, 0.3140, .0003140 all have 4 sig figs

Front 24

sig figs 3) terminal zeros in a number without an explicit decimal point may or may not be significant

Back 24

100cm can have 1 2 or 3 sig figs

Front 25

determine sig figs for multiplication and division

Back 25

give as many sig figs in the answer as there are in the measurement with the least number of sig figs

Front 26

determine sig figs for addition and subtraction

Back 26

give the same umber of decimal places in the answer as there are in the measurement with the least number deciaml places

Front 27

1kg= _____ lbs

Back 27

2.205

Front 28

celsius to kelvin

Back 28

Tk=(TcX1k/1*C)+273.15K

Front 29

Celsius to Fahrenheit

Back 29

Tf=(TcX9*F/5*C)+32*F

Front 30

Fahrenheit to CElsius

Back 30

Tc+5*C/9*FX(Tf-328F)

Front 31

density

Back 31

an objects mass per unit volume d=m/v

Front 32

intensive properties

Back 32

independent of the amount of a substance

Front 33

extensive properties

Back 33

depend on the amount of a substance