Mid-Year Review

Chemistry,Earth History,Infectious Dieases

Chemistry-8.P.1 understanding the properties of matter and changes that occur when matter interacts in an open closed conatiner

physical properties-describes how something looks,smells,feels,sounds,or taste

EX: odor,mass,density,color

chemical properties-are a characteristics that you can only observe by changing the identity of the substance Ex: flammability reactivity

physical change-any change that does not involve a change in the substance chemical identity. Ex: brown chair to white chair

chemical change- any change in matter that results in the formation of a new chemical substance Ex: normal egg to boiled egg

elements-building blocks of matter made of atoms Ex: oxygen(O),gold(Au),sodium(Na)

compounds-substance formed when 2 or more elements chemically combined

Ex: H2O,C6H12O2

mixture-combination of 2 or more different substance that is mixed not combined EX: Heterogeneous- bowl of cereal,trail mix,gunpowder

periodic table- a table of elements arranged in order of atomic number,usually in a row

groups- columns of elements on a periodic table that shares common properties

periods- the periodic table has seven horizontal rows known as periods

metals- a solid material that is hard and shiny

non-metals- an element or substance that is not a metal

metalloids- an element Ex:germanium,silicon

atomic numbers- it is equal to the number of protons in the nucleus

atomic mass- the mass of an atom of a chemical element that is equivalent to the number of protons and neutrons

protons-a positive electric charge that is like an electron

neutrons- same mass as protons but with out the electric charge

electrons-has a negative charge is found in all atoms

law of conservation of mass-mass is nether created or destroyed

Earth History

law of superposition-younger rocks lie above older rocks if the layer have not been disturbed

index fossil-fossils widely distributed organisms that lived during only one short period

is a core sample that is typically removed from an ice sheet

geologic time scale- a system that measures times

relative dating-the age of the rock compared to the ages of rock layers

absolute dating-the age of the rock given of years since the rock formed

half life-time it takes for 1/2 of the isotopes to decay

infectious dieases

microorganism- a microscopic organism,especially a bacterium,virus or fungus

virus-an infective agent that typically consist of nucleic acid molecule in protein coat

bacteria-plural form of bacterium

fungi-plural form of fungus

parasite-an organism that lives in an other organism(its host)Ex: Mosquitoes

epidemic- a widespread outbreak of an infectious disease within a small population or community

pandemic-an outbreak of an infectious disease that affects large population

biotechnology-the useful product (such as crops that insects are less likely to destroy or new kinds of medicine)

careers-animal biotechnology, safety food, biotechnology agriculture, etc

agriculture-the science or project of farming Ex: soil for growing crops and rearing of animals to provide food

medicine- the science or project of making treatments/prevention of a disease

economy- the wealth and resources of a country or region