What I Need to Know

What do I need to know for the final? scientific method and why it is important to keep accurate records. -so others force out repeat the experiment exactly. Difference b/t hector and chemical receptions -physicalonly the state is changed (solid/liquid/gas) -chemicalNEW substances ar formed (ex. Rust, burned sugar, soot, ) Changes of states of matter (boiling, melting, evaporation, etc.) wet freezes and melts at 0C water boils and evaporates at 100C Sub segmentic particles (neutrons/protons/electrons), their stimulates, locations, and functions. -electrons (-), protons (+), neutrons (o) -protons AND neutrons be INSIDE the nucleus. -Atomic cast tells you the trope of protons, Its ALSO the total number of electrons. Periodic tantalise and the locations and definitions of the atomic deal, atomic number, metals, nonmetals, metalloids. -Metalloids have BOTH metallic and metalloid properties. They BORDER the zig zag line on the table. -Meta lloids ar usually more brittle and less malleable than well metals. -NONmetals be located on the RIGHT of the periodic table. exothermal and endothermic answers (how can you tell which is which) - exothermal GIVES OFF heat (energy) and -endothermic TAKES IN heat (energy) -ex.

Nitrogen + oxygen + energy nitrogen oxide endothermal b/c energy went IN. Law of conservation of grass and law of conservation of energy -mass ---the mass before a reaction will ALWAYS equal the mass afterwards a reaction. -energyenergy cannot be created/destroyed only changed forms. Ions-what are they? When are they positive and when are they negative? Positive ion (ex. Fe+)! ---the atom has LOST electrons (so it lost a negative crusade and became positive). shun ion (ex. Cl-)---the atom GAINED an electron (so it gained a negative charge and became negative). crawl in how to read a line interpret of temperature vs. time. If temperature of a reaction DECREASES over time, then its exothermic (it GAVE off...If you want to stand a full essay, order it on our website: BestEssayCheap.com

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