science final

what is the 3 main steps for the scientific method?

1. observe: gathering facts, forming questions 2. hypothesis: possible answer to why it’s happening 3. experimenting: test hypothesis

what do you do if the result doesn’t support hypothesis ?

modify the hypothesis

scientific theory

hypothesis that passes many experiments and has the support of other scientists ex. relatives, plate tectonics

scientific laws

generalization with no exceptions found ex. laws of gravity, laws of thermodynamics

are theories and laws absolute?

No

standard of measurement

specific measure to which other measure are compared to ensure uniformity

english system

used in the U.S., “british system”, length: foot, mile, yard, mass: pound, volume: gallon, quart

british system

the SI system, international system. Length: meter, centimeter. Mass: gram, kilogram. Volume: liter, millimeter

accuracy

how closely a measurement reflects the actual value

precision

the repeatability of a measurement, how closely several measurements are to eachother

significant figures

the digits that are certainly along with one uncertain digits

unit analysis

multiplying number by a fraction that has value of 1, it does not change the value of the number

unit multipliers

a fraction that equals the number 1 that can help convert from 1 unit to another

scientific notation

a shortcut for long numbers, every number can be expressed as a number between 1 & 10, multiplied by a power of 10

fahrenheit

used in United States, freezing point of water 32of. boiling point of water 212of.

what is the boiling point of water in Fahrenheit

212

what is the freezing point of water in Fahrenheit

32

celsius

metric scale of temp used in other country and science

what is the freezing point of water in Celsius

0

what is the boiling point of water in Celsius

100

kelvin scale

scale which uses absolute zero as it’s coldest possible temperature

what is the boiling point of water in kelvin

373.15

what is the freezing point of water in kelvin

273.15

matter

anything that has mass and occupies space

volume

the space it occupies

density

the mass per unit volume of a substance, the compactness of a substance

density of water

1.00

density of air

0.0013

for something to float in water

less than 1

chemistry

the study of matter and how it changes

element

a substance that cannot be broken down into simpler substances

atom

the smallest particle that has the properties of an element

how many elements are there

118

compound

different types of atoms chemically linked together

mixture

compound of s