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= piling/volume D=g/mL V=cm3/mL animal(prenominal) Properties-without ever-changing the art object or identity of a message chemical substance property-change in composition and can be find only by means of a chemical reacton Physical change-produce a difference in appearance of a bosom without change in its composition or identity Chemical reaction-a process of rearranging, replacing, or adding atoms to produce bare-ass substance. SIG FIG confidential information zero-example 0.0141 has three sig fig Confined Zero-those among nonzero digits are always significant. exemplar 3.036 has cardinal sig fig tracking zero, those at the end of a egress, are significant if a decimal point is demonstrate in the number. Example 56.00 has four sig figs and 0. 05050 has four sig 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 confide Multiplication/division-fewest sig fig Example 4.2*15.94/2.255=29.

688691=30 Isotopes-have unalike mass number that 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 portion Number of proton+Number neutron(A) Nonmetal No metallic luster, unequal electrical conductivity, honorable heat insulator, brittle and nonmalleable Metal tinny gray or silvery luster, High electrical and thermal 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 refuge essay, order it on our website: OrderCustomPaper.com

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