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Semester I Review Semester I Review How many sig-figs are found in each number? 0.345 3005 300 3.002 0.00023 Semester I Review Round each number to three sig-figs. 45678 0.002894 23.76 100.5 56.799 Semester I Review Which of the following is a mixture. Pure water Clean air Iron (II) oxide Salt water Carbon dioxide Semester I Review Which of the following is a chemical change. Cutting paper Boiling water Rusting iron Burning gasoline Complete the table using the given numbers Symbol Mass # X - ___ Atomic # Protons 10 Electrons 15 Y - 35 Z - ___ Neutrons 14 56 25 Semester I Review Calculate the average atomic mass given the following data: element Y has three isotopes 35.0% = 23.5 amu, 55.0% = 25.0 amu and 10.0% = 26.0 amu. Semester I Review 25.0 grams of a given metal displaces 44.2 mL of water; what is the density of the metal? Semester I Review What did each scientist contribute to the development of the modern atom. Dalton Thomson Rutherford Milliken Determine if the data below is accurate, precise, both, or neither Trial # Measurement 1 34.56 2 34.45 3 34.78 True Value = 34.50 Calculate the percent error using the average of the measurements. Semester I Review 1. 2. 3. The splitting of a nucleus is known as ________. The combining of two small nuclei to form a larger one is known as __________. Give the formula of an alpha particle and beta particle. Semester I Review 1. Decay of polonium-218 by alpha () emission. 2. Decay of carbon – 14 by beta emission 3. Decay of Thorium - 232 by an electron capture Semester I Review 1. The half-life of phosphorous-30 is 2.5 min. If you start with 55 g of phosphorus-30, how many grams would remain after 27.5 min? Semester I Review A radioactive isotope decayed from 200.0 grams to 3.125 grams in 15 years. Determine the half-life of the isotope. Semester I Review Calculate the wavelength of electromagnetic radiation with a frequency of 6.5x1016 Hz. Calculate the energy of the above electromagnetic radiation. Semester I Review If n=4; how many sublevels, Orbitals, and Electrons are present? T or F (p) sublevels have 7 orbitals T or F (d) sublevels hold 6 electrons T or F (s) sublevels hold 2 electrons Semester I Review For the element Cobalt; give the: Long hand electron configuration Box and arrow notation Noble gas configuration Electron Dot Structure Semester II Review • • Which of the following elements has the smallest first ionization energy: potassium or calcium? Which of the following has the smallest atomic radius: O or S? The energy required to remove an electron from a gaseous atom is called the _______. Semester II Review • Atomic size generally ____ as you move left to right in a period. How does atomic radius change down a group in the periodic table? How does ionization energy change as you move up and to right on the periodic table? Semester II Review Sheilding will ________ as you go down a group. Sheilding will ________ as you move left to right across a period. Electronegativity will _______ as you move down and to the left. Columns on the periodic table are known as_______. Rows on the table are known as_______.