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Chem Final Review- 15 Questions

Chem Final Review- 15 Questions. Get out… Scratch Paper Calculator Blue Sheet Periodic Table Mole Map. Question #1. What is the mass of 3.5 moles of Cu(NO 3 ) 2 ?. Molar mass = 187.5 3.5 x 187.5 = 656.25. Question #2. What mass of NaF would be made from 42.1 L of F 2 gas at STP?

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Chem Final Review- 15 Questions

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  1. Chem Final Review-15 Questions Get out… Scratch Paper Calculator Blue Sheet Periodic Table Mole Map

  2. Question #1 • What is the mass of 3.5 moles of Cu(NO3)2? Molar mass = 187.5 3.5 x 187.5 = 656.25

  3. Question #2 • What mass of NaF would be made from 42.1 L of F2 gas at STP? 2Na + F2 2NaF 42.1L / 22.4 L x 2 molNaF x 42g = 158g

  4. Question #3 • Balance this equation: __ NaCl +__Cu  __CuCl2 + __Na 2_ NaCl +__Cu  __CuCl2 + 2_Na

  5. Question #4 • What type of reaction is this? 2 NaCl + Cu  CuCl2 + 2 Na Single Replacement

  6. Question #5 • Using this balanced equation, 2 NaCl + Cu  CuCl2 + 2 Na If you had 50g of Cu and 25g of NaCl, which would be the limiting reactant? • Convert massmolmol Na for each • The one which makes the least Na is the limiting • 50g Cu makes 1.57 mol Na • 25g NaCl makes 0.43 mol Na • NaCl is limiting

  7. Question #6 • Use Collision Theory to explain WHY heating up a reaction causes it to occur faster (2 reasons) • Particles move faster so… • Hit more often and • Hit with more energy

  8. Question #7 CaCO3(s) + HCl(aq) CaCl2(aq) + H2O(l) + CO2(g) What would happen to this graph if the CaCO3 was ground finely?

  9. Question #8 • Name this organic compound using IUPAC rules C – C – C = C – C • 2-pentene

  10. Question #9 • 2-Butene + HBr→ • 2-Bromobutane

  11. Question #10 • Write a balanced chemical equation for the reaction between aluminum and chlorine. • 2 Al + 3 Cl2 2 AlCl3

  12. Question #11 • What would you see if you added solid calcium carbonate to hydrochloric acid? • Write the balanced equation • Bubbles • CaCO3+ 2 HCl CaCl2 + H2CO3 H2O + CO2

  13. Question #12 • Name some general properties of bases • Bitter tasting • In cleaners • pH > 7 • [H+] < 1 x 10-7 • Feel slippery • Formulas end with OH or CO3 • Pink in phenolphthalein • Blue/purple in U.I.

  14. Question #13 • Name this: • C – C – C – C – C – C – C = C l l Cl C • 7-chloro-5-methyl-1 octene

  15. Question #14 • Calculate the pH of a solution with a [OH-] of 1.2 x 10-10 • 2 ways… • [H+] = 1x 10-14/[OH-] = 8.3 x 10-5 Then, pH = -log[H+] = 4.1 • pOH = -log[OH-] = 9.9 • Then, pH = 14-pOH = 4.1

  16. Question #15 • Why are saturated fats more unhealthy? • They remain solid at room/body temp • So… they build up in your body • Clogging arteries • Making blood platelets sticky • Increasing bad cholesterol

  17. Good Luck!

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