1. Semester I Review

2. How many sig-figs are found in each number?  0.345  3005  300  3.002  0.00023

3. Semester I Review Round each number to three sig-figs.  45678  0.002894  23.76  100.5  56.799

4. Semester I Review Which of the following is a mixture.  Pure water  Clean air  Iron (II) oxide  Salt water  Carbon dioxide

5. Semester I Review Which of the following is a chemical change.  Cutting paper  Boiling water  Rusting iron  Burning gasoline

6. SymbolMass #Atomic #ProtonsNeutronsElectrons X - ___1015 Y - 3514 Z - ___5625 Complete the table using the given numbers

7. 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.

8. Semester I Review 25.0 grams of a given metal displaces 44.2 mL of water; what is the density of the metal?

9. Semester I Review What did each scientist contribute to the development of the modern atom.  Dalton  Thomson  Rutherford  Milliken

10. Trial #MeasurementTrue Value = 34.50 134.56 234.45 334.78 Determine if the data below is accurate, precise, both, or neither Calculate the percent error using the average of the measurements.

11. Semester I Review 1. The splitting of a nucleus is known as ________. 2. The combining of two small nuclei to form a larger one is known as __________. 3. Give the formula of an alpha particle and beta particle.

12. 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

13. 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?

14. 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.

15. Semester I Review Calculate the wavelength of electromagnetic radiation with a frequency of 6.5x10 16 Hz. Calculate the energy of the above electromagnetic radiation.

16. 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

17. Semester I Review For the element Cobalt; give the: Long hand electron configuration Box and arrow notation Noble gas configuration Electron Dot Structure

18. 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 _______.

19. 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?

20. 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_______.