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CHEMISTRY

CHEMISTRY. MID TERM EXAM REVIEW. 1. 1. How many atoms of hydrogen are present in 3 moles of acetic acid?. 2.

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CHEMISTRY

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  1. CHEMISTRY MID TERM EXAM REVIEW gugs 1

  2. 1. How many atoms of hydrogen are present in 3 moles of acetic acid? 2

  3. 1. How many atoms of hydrogen are present in 3 moles of acetic acid?3 mol Ac x 4 moles H x 6.02 X 1023atoms H 1 mole Ac 1 mole H= 7.22 X 1024atoms gugs 3

  4. 2. What is the molecular formula of butane? gugs 4

  5. 2. What is the molecular formula of butane?C4H10 gugs 5

  6. 3. How many moles of carbon are present in 2 moles of butane? gugs 6

  7. 3. How many moles of carbon is present in 2 moles of butane?2 mol butane x 4 mol C = 8 mol C1 mol butane gugs 7

  8. 4. What is the percent composition of ethanol? gugs 8

  9. 4. What is the percent composition of ethanol?First findMOLAR MASS2C = 2 x 12.0 = 24.06H = 6 x 1.0 = 6.01O = 1 x 16.0 = 16.0Total 46.0 g/mol gugs 9

  10. 4. - continued What is the percent composition of ethanol?Mass of each element / Total x 100 = %%C = 24.0/46.0 x (100) = 52% %H = 6.0/46.0 x (100) = 13%%O = 16.0/46.0 x (100) = 35% gugs 10

  11. 5. Classify the reactions shown below gugs 11

  12. 5.Classify the reactions shown below Decomposition gugs 12

  13. 5. Classify the reactions shown below Decomposition Double replacement gugs 13

  14. 5. Classify the reactions shown below Decomposition Double replacement Synthesis gugs 14

  15. 5. Classify the reactions shown below Decomposition Double replacement Synthesis Single replacement gugs 15

  16. 6. What number should be written in front of Na to balance the equationNa + Cl2 NaCl ? gugs 16

  17. 6. What number should be written in front of Na to balance the equationNa + Cl2 NaCl ?22Na + Cl2  2NaCl gugs 17

  18. 7. What number should be written in front of Fe in order to balanceFe + O2 Fe2O3? gugs 18

  19. 7. What number should be written in front of Fe in order to balanceFe + O2 Fe2O3?4 gugs 19

  20. 7. What number should be written in front of Fe in order to balanceFe + O2 Fe2O3?4 4Fe + 3O2  2Fe2O3 gugs 20

  21. 8.Measure the object with the ruler to the correct number of significant figures. gugs 21

  22. 8. Measure the object with the ruler to the correct number of significant figures. 11.65 cm gugs 22

  23. 8. Measure the object with the ruler to the correct number of significant figures. 11.65 cmMust make ONE estimate smaller than marks. gugs 23

  24. 9. Classify each as accurate &/ or precise gugs 24

  25. 9. Classify each as accurate &/ or precise gugs 25

  26. 10. What symbol expresses uncertainty in a measurement?

  27. 10. What symbol expresses uncertainty in a measurement? +/-

  28. 11. Name the compound S3O6

  29. 11. Name the compound S3O6 Trisulfur hexoxide

  30. 12. What is the formula for the compound that is formed by magnesium and hydroxide ions?

  31. 12. What is the formula for the compound that is formed by magnesium and hydroxide ions? Mg(OH)2

  32. 13. What is the formula for the compound that will form between calcium and phosphate ions?

  33. 13. What is the formula for the compound that will form between calcium and phosphate ions? Ca3(PO4)2

  34. 14. What is the correct formula for barium oxide?

  35. 14. What is the correct formula for barium oxide? BaO

  36. 15. What is the volume of a mole of gas at STP?

  37. 15. What is the volume of a mole of gas at STP? 22.4 L

  38. 16. In a chemical reaction, the total mass of the products compared to the total mass of the reactants is

  39. 16. In a chemical reaction, the total mass of the products compared to the total mass of the reactants is always the same

  40. 17. Calculate the number of atoms in 1.40 mol of Ag.

  41. 17. Calculate the number of atoms in 1.40 mol of Ag. 1.40 mol x 6.02 X 10 23 atoms 1 mol = 8.43 X 10 23 atoms

  42. 18. Calculate the number of liters of gas in 1.47 mols at STP

  43. 18. Calculate the number of liters of gas in 1.47 mols at STP 1.47 mol x 22.4 L 1 mol = 32.9 L

  44. 19. In the formula Ca3(PO4)2, the total number of oxygen atoms is

  45. 19. In the formula Ca3(PO4)2, the total number of oxygen atoms is 2 X 4 = 8 oxygen atoms

  46. 20. In the formula 3 Mg(NO3)2, the total number of oxygen atoms is

  47. 20. In the formula 3 Mg(NO3)2, the total number of oxygen atoms is 3 (3 X 2) = 18 oxygen atoms

  48. 21. In the formula 3 Mg(NO3)2, the total number of atoms is

  49. 21. In the formula 3 Mg(NO3)2, the total number of atoms is 18 oxygen atoms + 3 Mg atoms + 6 nitrogen atoms = 27 total atoms

  50. 22. In the expression 3Mg(NO3)2, the number 2 is known as the ______.

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