# Chemistry Final Semester 1

 How do you solve for density? How do you find mass? How do you find volume? HCl hydoro-chloric acid Phospheric acid Hydro-chloric acid Phospheric acid Nitric acid HNO3 HNO3 Nitric acid Sulfuric acid H2SO4 H2SO4 Sulfuric acid Acetic acid CH3COOH CH3COOH Acetic acid Carbonic acid H2Co3 H2CO3 Carbonic acid Water freezes at? 0o C Water boils at? 100oC Oxidation numbers Find two elements oxidation numbers, add them up, then find the last one. Ex. Mg(No3)2 O: 3x2=6 so (6)(-2)=-12Mg:(1)(2)=2-12+2=-10N:(2)(5)=10-10+10=0 Isotopes Number of protons and nutrons. (They are the same number)Ex. C- 6+6=12amu'sElectrons have no mass. Don't add them. Look at atomic mass and top number. Vertical columns of teh periodic table are called? Groups or families The horizontal rows of elements in the periodic table are called? Periods Mass Symbol: mUnit name: kilogram Unit abbreviation: kg Length Symbol: lUnit name: meterUnit abbreviation: kg Volume Symbol: VSolve: Length x width x height Kilo Abbreviation: kExponential factor: 103Meaning:1,000 Example: 1 kilometer(km)=1,000m centi Abbreviation: cExponential Factor:10-2Meaning: 1/100Example: 1 centimeter (cm) = o.o1 m mili Abbreviation: mExponential factor: 10-3Meaning: 1/1,000Example: 1millimeter (mm) = 0.001 m deci Symbol: dExponential factor: 10-1Meaning: 1/10Example: 1 decimeter (dm)=0.1m Convert C o to Fo Multiply by 9, then divide by 5, then add 32 Convert from Fo to Co Deduct 32, then multiply by 5, then divide by 9 Energy levels n=1 (s)n=2 (s,p)n=3 (s,p,d)n=4 (s,p,d,f)n=5n=6 Number of electrons in the blocks s=2p=6d=10f=14 Number of orbitals per block s=1p=3d=5f=7 Development of the periodic table Johann Dobereiner began to group elements with similar properties into groups. A.E. Beguyer de Chancourtois was the first person to make use of atomic weights to reveal that te elements were arranged according to their atomic weights with similar elements occurring at regular intervals. Medeleev and Meyer produced it. Nucleus Composed of protons, electrons, and neutrons. Protons are positive, electrons are negative, and neutrons are neutral. Significant digits 1.All digits are significant except zeros at the beginning of the number, and possibly terminal zeros. 2.Terminal zeros ending at the right of the decimal point are significant. 3.Terminal zeros in a number without an explicit decimal point may or may not be significant. Ex. 0.0025 = 2 Significant Figures 252 = 3 Significant Figures 250 =2 or 3 Significant Figures Scientific notation Just the digits (with the decimal point placed after the first digit), followed by× 10 to a power that puts the decimal point where it should be (i.e. it shows how many places to move the decimal point). Avogardro's constant mole=6.02x1023 Empirical Formula Determination 1.treat % as mass, and convert grams to moles.2.divide each value of moles by the smallest of the values.3.multiply each number by an integer to obtain all whole numbers. Finding Molecular Formula 1.find the formula mass of C3H5O22.divide the molecular mass by the mass given by the empirical formula.3.multiply the empirical formula by this number to get the molecular formula. AuthorAnonymous ID130712 Card SetChemistry Final Semester 1 DescriptionChemistry Final Semester 1 Updated2012-01-26T07:49:37Z Show Answers