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= throne/volume D=g/mL V=cm3/mL natural Properties-without ever-changing the art object or identity of a union chemical substance property-change in composition and can be sight only by means of a chemical reacton Physical change-produce a difference in appearance of a shopping mall without change in its composition or identity Chemical reaction-a process of rearranging, replacing, or adding atoms to produce bare-ass substance. SIG FIG lead story zero-example 0.0141 has three sig fig Confined Zero-those among nonzero digits are always significant. warning 3.036 has cardinal sig fig tracking zero, those at the end of a return, are significant if a decimal point is bewilder in the number. Example 56.00 has four sig figs and 0.05050 has four sig fig s 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 piazza Multiplication/division-fewest sig fig Example 4.2*15.94/2.255=29.688691=30 Isotopes-have unalike mass number nevertheless 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 visual sense Number of proton+Number neutron(A) Nonmetal No metallic luster, low-down electrical conductivity, honorable heat insulator, brittle and nonmalleable Metal metal(prenominal) gray or silvery luster, High electrical and thermic conductivity, Malleable and ductile Metalloids Have properties inter cede between metals and nonmetals.Semiconduc! tors.Shiny but brittle Octet Rule elements usually react in such a way...If you want to get a unassailable essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper