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Sem 1 09-10 Final Review Regular Chem

Sem 1 09-10 Final Review Regular Chem. 1. When elements combine to form substances consisting of two or more different atoms. 1a. chemical compounds. 2. H 2 SO 4 How many different elements?. 2a. 3. 3. H 2 SO 4 How many total atoms of elements?. 3a. 7. 4.

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Sem 1 09-10 Final Review Regular Chem

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  1. Sem 1 09-10 Final ReviewRegular Chem

  2. 1 • When elements combine to form substances consisting of two or more different atoms

  3. 1a chemical compounds

  4. 2 • H2SO4 • How many different elements?

  5. 2a • 3

  6. 3 • H2SO4 • How many total atoms of elements?

  7. 3a • 7

  8. 4 • 1st energy level holds ? e- • 2nd holds ? e-

  9. 4a • 2 • 8

  10. 5 • Charged particles are called ?

  11. 5a • Ions -

  12. 6 • Bonds that share electrons are called ?

  13. 6a • Covalent Bonds

  14. 7 • The elements or compounds that enter the reaction are called -

  15. 7a • Reactants

  16. 8 • Elements or compounds produced in a chemical reaction are called -

  17. 8a • Products

  18. 9 • reactants -----> products • What does the arrow mean?

  19. 9a • To make or to yield

  20. 10 • Balance H2 + O2 -----> H2O • Write the sum of the coefficients

  21. 10a 2 H2 + O2 -----> 2 H2O Sum of coefficients is 5 (2+1+2)

  22. 11 • Balance Fe2O3 + CO -----> Fe3O4 + CO2 • Find the sum of coefficients

  23. 11a 3 Fe2O3 + CO -----> 2 Fe3O4 + CO2 Sum of coefficients is 7 (3+1+2+1)

  24. 12 Hydrogen and chlorine react to produce hydrochloric acid • Change to a balanced equation • (remember boot elements are diatomic)

  25. 12a H2 + Cl2 -----> 2HCl

  26. 13 • What type of reaction is this?

  27. 13a • Combination/synthesis

  28. 14 • Type of reaction

  29. 14a • decomposition

  30. 15 • Zinc plus iodine makes zinciodide • Write the balanced equation

  31. 15a • Zn + I2 ZnI2

  32. 16 • Write the balanced equation for the decomposition of water

  33. 16a • 2 H2O  2 H2 + O2

  34. 17 • Write the single displacement reaction that makes sodium hydroxide and a gas from sodium and water

  35. 17a • 2 Na + 2 H2O  2 NaOH + H2

  36. 18 • Sr2+ has how many protons, neutrons and electrons?

  37. 18a • 38 protons, 50 neutrons, and 36 electrons.

  38. 19 • A certain metallic element forms a compound with chlorine, having the general formula XCl2. The X ion in this compound has 28 electrons. What is element X

  39. 19a • Zn

  40. 20 • Elements belonging to which group of the periodic table form ions with a 2+ charge?

  41. 20a • Alkaline Earth Metals

  42. 21 • An ion with a positive charge is called a ___________;a negatively charged ion is called an___________

  43. 21a • cation (pronounced CAT-ion); • anion (AN-ion).

  44. 22 • Give the complete chemical symbols for the following ions: (a) The ion with 26 protons, 30 neutrons, and 24 electrons; (b) the phosphorus ion with 16 neutrons and 18 electrons.

  45. 22a • (a) The element whose atoms have 26 protons (atomic # 26) is Fe (iron). The mass number of this isotope is 26 + 30 = 56 (the sum of the protons and neutrons). Because the ion has two more protons than electrons, it has a net charge of 2+. Thus, the complete symbol for the ion is 56Fe2+ • (b) By referring to a periodic table or table of elements, we see that phosphorus (symbol P) has an atomic number of 15. Thus, each atom has 15 protons. The mass number of the ion is 15 + 16 = 31. Because the ion has 15 protons and 18 electrons (three more electrons than protons), its net charge is 3-. Thus, the complete symbol for the ion is 31P3-

  46. 23 • polyatomic ions are (give an example as well as a definiton)

  47. 23a • These ions consist of atoms joined as in a molecule, but they have a net positive or negative charge • Ex: NO3– (nitrate ion) & SO42– (sulfate ion).

  48. 24 • atoms gain or lose electrons so as to end up with the same number of electrons as

  49. 24a • the noble gases

  50. 25 • Predict the charges expected for the most stable ions of barium and oxygen.

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