Unit 1 Chem

get a hint

hint

quantitative data

quantitative data

numerical data

qualitative data

data gained through observing

Precision

how close you are for each attempt

accuracy

how close you are to the actual answer

independent variable

variable that you change for the experiment

dependent variable

variable that you gain data for

control

unchanged data that you keep to compare

SI unit

internationally agreed upon system of measurements

Base unit

units that are based on an object or event in the physical world

Derived unit

unit that is defined by a combination of base units

density equation

d=m/v

scientific notation

used to write numbers so that they are between 1 and 10 multiplued by 10 and raised to a power

positive exponent

decimal moves to the left

negative exponent

decimal moves to the right

adding/subtracting exponents

exponents must be the same

multiplying exponents

add exponents

dividing exponents

subtract exponents

8588

8.588*10^3

0.00518

5.18 * 10^-3

Dimensional analysis

converting from one unit to another

Conversion factor

ratio of equivalent values having different units

percent error

(|accepted - experiment|/accepted)*100

Significant figures

all known digits plus one estimated digit

theory

explamation that has been repeatedly supported by many experiments

scientific law

relationship in nature that is supported by many experiments

length

meter (m)

mass

kilogram(kg)

Time

seconds(s)

Electric current

ampere(A)

thermodynamic temperature

Kelvin(K)

amount of substance

mole(mol)

Luminous intensity

candela(cd)

tera

10^12

giga

10^9

mega

10^6

kilo

10^3

hecto

10^2

deka

10^1

deci

10^-1

centi

10^-2

milli

10^-3

micro

10^-6

nano

10^-9

pico

10^-12