<p> Chemistry Midterm Review –Quiz grade</p><p>Worth 2 points each unless otherwise stated</p><p>1. What is the Law of definite composition and the Law of Conservation of mass?</p><p>2. (1 point) How many trials are needed to make a test reliable? </p><p>3. What is the difference between accurate and precision?</p><p>4. Convert 0.0172kg to g</p><p>5. Determine the number of atoms in 4 moles of Al.</p><p>6. State the types (and describe each) of physical separation technique for compounds.</p><p>7. What is the difference between physical and chemical change (give an example of each)?</p><p>8. Determine the number of grams of 0.500 moles of U.</p><p>-3 9. Calculate the number of moles of 5.00 x 10 g of Au.</p><p>10. (1 point) What is an isotope? </p><p>35 37 11. (6 points)Determine the number of P,E, and N of Isotopes Cl and Cl</p><p>12. Diamonds and other gemstones are measured in carats. The accepted value for the weight of a carat is 0.2 grams. A jeweler measured the weight of a carat of opals to be 0.192 grams. What is the percent error?</p><p>13 14 13. Calculate the Atomic mass units for C at 25% and C at 75%.</p><p>14. What is an allotrope and give an example?</p><p>15. What is a diatomic molecule? And give to examples</p><p>16. Using Significant Figure Multiplication rules answer the following: 7.5m x 32.5m</p><p>17. (3 points)Determine the number of Significant Digits and Scientific Notation of the following: 1.3406, 0.0976, and 10009600</p><p>18. What is the density of an object with a mass of 20g and a volume of 4.2mL?</p><p>19. Determine the half-life of a radioisotope that has a half-life of 4 days. How much of a 20 gram sample of this isotope will remain after 8 days.</p><p>1 20. (4 points)Determine the Bohr atomic Model and the long and short electron configuration of Si and Ar.</p><p>21. (3 points)What is the difference between an element, compound, and mixture (Give an example of each too)?</p><p>22. (3 points) What is the difference between a metal, metalloid, and nonmetal (Give an example of each)</p><p>23. Name the groups and write down the elements found in the following groups: 1, 2, 17, 18</p><p>24. (1 point each) What can you conclude from Rutherford’s Gold Foil experiment?</p><p>25. (1 point each) What is the most reactive element? (state why too)</p><p>26. (4 points) What is the order from lowest to highest for Atomic radius and Electronegativity for the following: S, P, Ar, Cl, Si</p><p>27. (1 point) Where is the energy stored in a chemical compound?</p><p>28. (1 point)Ionic solids are held together by ______.</p><p>29. (4 points) What are the properties of Ionic and Covalent bonds?</p><p>30. (3 points)Covalent or Ionic: AlPO4, NaCl, CO2</p><p>31. (3 points) Write the Ionic Chemical formula for the following: Barium fluoride, Tin (II) oxide, Titanium (III) Phosphate</p><p>32. (3 points) Write the Ionic Name of the following: Fe2O3, NaI, KHCO3</p><p>33. Write the Covalent Name of the following: CCl4, N2O5</p><p>34. Write the formula of the following Covalent molecules: Sulfur tetrafluoride, Nonabromine octaiodide</p><p>35. What are Van der Waal forces?</p><p>36. Atoms in polar covalent molecules are held together by ______electrons while nonpolar ones are held together by ______sharing of electrons.</p><p>37. (4 points) Draw the VSEPR structure, name the structure, and give the bond angle: CO, </p><p>NH3 </p><p>2 38. Find the oxidation state of the following: (Find Br) KBr, (Find Sn) SnI2 </p><p>39. Name the following Acids: H3PO3 and HF</p><p>40. What is the molar mass of C6H5OH (phenol)?</p><p>41. Determine the Percentage composition of CO(NH2)2.</p><p>42. Find the EF of 29.44g of C, 23.55g of S, and 47g of O.</p><p>43. Find the MF of a substance with a molecular molar mass of 78.12 g/mol and the EF is CH.</p><p>44. State the 2 requirements for an organic substance.</p><p>3</p>