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PS midterm


science the knowledge obtained by observing natural events and conditions
data raw information
observation an act or instnace of noting
evolution the world gradually developed
creationism says that world was created in 6 days
irreducidly complex is a pseudoscientific argument by proponents of intelligent design
bacterial Flagellan is a tail-like projection that protrudes from the cell body of certain prokaryotic eurokaryotic cells
scientific method refers to a body of techniques for investigating phenomena aquiring new knowledge
theistic evolution the world gradually developed
intelligent deisgn the world had to havd had a deisgner
hypothesis a mere assumption or guess
qualitative data is used to describe certain types of information
theory refers to contemplation as opposed to action
quanitative data os data measured on a numerial scale
law is a system of rules usuall enforced through a set of institution
density is defined as its mass per unit volume
mass is a body of matter, usually of indefinite shape and often of considerable size
matter is a general term for the substance of which all physical objects consist
measurement a measured dimension
dimensional analysis is a tool to find ro check relations among physical quantities by using their dimensions
scientific notation also known as standard form or as exponential notation
elements one class of substances that cannot be seperated into simplier substnaces by chemical means
compunds composed of 2 or more parts elements, or ingredients
mixtures an aggregate of 2 or more substances that are not chemically united and that exist in no fixed proportion to each other
pure substance is any material with a definite chemical composition
density diatomic molecules are molecules composed of 2 atoms
chemical property is any of a material's properties that becomes evident during a chemical reaction
physical change a change of matter from one form to antoher without a change in chemical properties
attractive is an infleunce that causes a free body too undergo a change - its a type of force
temperature is a physcial propety of omatter that quantitatively expresses the common notions of hot and cold
thermal energy is a part of the total, internal energy of a thermodynomic system or sample of matter that results in the system's temperature
4 states of matter solid, liquid , gas, plasma
phase change is a transformation of a thermodynamic system from one phase to another
Charles Law is a gas law which describes how gases tend to expand when heated
Boyle's Law is one ot the gas law and describes the inversely proportional relationship between the absolute pressure and volume of gas
law of definite proportions states that a chemical compound always contains exactly the sam proportion of elements by mass
fission the process by which a nuclues splits into 2 or more frequencies and releases neutrons and energy
fusion the process which light nuclei combine at extremely high temperature
isotopes an atom that has the same number of protons as the other atoms of the same elements
half life the time required for half of a sample of a radioactive isotope to break down
part is a atom nuclues consists of neutrons and protons with electrons flying around it
energy levels the number of energy levels that are filled in an atom deoends on the number of electrons
electrons a subatomic particle with a negative charge
protons a subatomic particle with a positive charge
neutrons a subatomic particle that has no charge
atomic mass is the mass of a specific isotope of a given atom
atomic number the number of protons in the nucleus of an atom
group number is a vertical column in the periodic table
types of bonds formed ionic bond, covalent bond, metalliac bond
ionic bond the attractive force between oppositely charged ions the electrons are transferred from one atom to the other
covalent bond a bond formed when atoms share one or more pairs of electrons
metalliac a bond formed by the attraction between positively charged metal ions and the electrons around them
subscripts the number that comes after the bond to tell you how many of them there is
octet rule states that on the last valance electon ring has to be 8
electron configuration is the arrangement of elctrons in an atom
period number the rows on the periodic table
valance electrons the electrons in the outer energy level of an atom
electron dot notation are diagrams that show the bonding between atoms of a molecule
signs of a chemical reaction rust, carbon dioxide in water, leaves changins, burning
Created by: jdavid