Chemistry Notes

1km=1000m 1000mL=1L 100 centi=1meter 1cm=0.01meters 1dm=0.1meters 1000mm=1meter 1000m=1km 1cm3=1mL 1Kg=1000g 1kg=2.2lbs 1mi=1.6093km 1in=2.54cm Kilo-10 Mega-10 Giga 10 Density= visual modality/volume D=g/mL V=cm3/mL visible Properties-without ever-changing the art object or identity of a capacity chemical substance property-change in composition and can be ascertained only by means of a chemical reacton Physical change-produce a difference in appearance of a pith without change in its composition or identity Chemical reaction-a process of rearranging, replacing, or adding atoms to produce bare-ass substance. SIG FIG leading(a) zero-example 0.0141 has three sig fig Confined Zero-those among nonzero digits are always significant. mannequin 3.036 has cardinal sig fig tracking zero, those at the end of a sum, are significant if a decimal point is deport in the number. Example 56.00 has four sig figs and 0.05050 has four si g figs and 59,000,000 has two sig figs and 6010 has 3 sig fig SIG FIG RULES Addition/Subtraction-example 54.4cm +2.02=56.42=56.4 little decimal graze Multiplication/division-fewest sig fig Example 4.2*15.94/2.255=29.

688691=30 Isotopes-have unalike mass number moreover identical numbers of proton, unlike number of nuetrons, identical chemical properties some are radioactive 3 types of subatomic particles Electrons: negative charge, outside nucleus, smallest mass Protons: positive charge, in the nucleus Neutrons: no charge, extremely dense, same mass as a proton, run aground in nucleus atomic come up Number of protons=number of electrons(Z! ) Atomic plentifulness Number of proton+Number neutron(A) Nonmetal No metallic luster, forgetful electrical conductivity, honorable heat insulator, brittle and nonmalleable Metal gold gray or silvery luster, High electrical and thermic conductivity, Malleable and ductile Metalloids Have properties intercede between metals and nonmetals.Semiconductors.Shiny but brittle Octet Rule elements usually react in such a way...If you want to get a harmless essay, order it on our website: OrderCustomPaper.com

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