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Chemistry Final Review Questions and Answers

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Prepare for your chemistry exam with these practice questions and answers covering topics like temperature conversion, gas laws, stoichiometry, and chemical reactions.

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Chemistry Final Review Questions and Answers

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  1. Semester 2 Final Review

  2. Chem Catalyst Convert 52oC to Kelvin Answer: 325 K

  3. 2.) Convert 424 Kelvin to Celsius Answer: 151 Celsius

  4. 3.) The term that describes going from gas to liquid Answer: Condensation

  5. 4.) The term that describes going from liquid to solid Answer: Freezing

  6. 5.) The term that describes going from liquid to gas Answer: Evaporation

  7. 7.) Assuming temperature stays constant, what happens to the pressure of a gas when the volume decreases? Answer: Pressure increases

  8. 8.) What is the relationship between pressure of a gas and number of particles? Answer: Direct proportional

  9. 9.) What is the relationship between Celsius temperature of a gas and pressure? Answer: Direct, but not proportional

  10. 10.) A balloon has a volume of 7.2 L and pressure of 2.0 atm. What will the new pressure be if the volume decreased to 5.0 L? Answer: 2.88 atm

  11. 11.) There were 4 main units we used for pressure. List them all. Answer: Atm, mmHg, psi, kPa

  12. 12.) A gas is at 400 K with a pressure of 3.2 psi. If the temperature decreases to 200 K, what will the new pressure be? Answer: 1.6 psi

  13. 13.) As a gas is heated, what happens to the kinetic energy of the gas? Answer: Kinetic energy increases

  14. 14.) How many oxygen atoms are represented in this formula? Sn(C2O3)2 Answer: 6 oxygen atoms

  15. 15.) How many total atoms are represented in this formula? Sn(C2O3)2 Answer: 11 total atoms

  16. 16.) If I have 1 mole of squirrels, how many squirrels would I have if I counted each one? Answer: 6.02 x 10^23

  17. 17.) How many molecules are there if I have 2 moles of H2 molecules? Answer: 12.04 x 10^23

  18. 18.) How many total atoms are there if I have 2 moles of H2 molecules? Answer: 24.08 x 10^23 atoms

  19. 19.) What is the molar mass of potassium nitrate, KNO3? Answer: 101.11 g KNO3

  20. 20.) What is the molar mass of magnesium phosphate, Mg3(PO4)2? Answer: 262.87 g

  21. 21.) How many moles of magnesium phosphate are there in 100 g of Mg3(PO4)2? Answer: 0.38 moles

  22. 22.) How many moles of potassium nitrate (KNO3) are there in 300 g of potassium nitrate? Answer: 2.967 moles

  23. 23.) If you have 0.05 moles of MgCl2, how many grams do you have? Answer: 4.76 g

  24. 24.) Classify the following reaction as a chemical or physical change, or neither.HCl(aq) + NaHCO3(aq)  NaCl(aq) + H2O(l) + CO2(g) Answer: Chemical change

  25. 25.) What would you expect to see if you carried out the following reaction?NaCN (s) + HCl (aq) → NaCl (aq) + HCN (g) Answer: Solid mixing with an aqueous solution, producing bubbles

  26. 26.) What will happen to the mass of products in this reaction? NaCN (s) + HCl (aq) → NaCl (aq) + HCN (g) Answer: Products weigh less, gas escapes

  27. 27.) What will happen to the mass of the products in this reaction?AgNO3 (aq) + KCl (aq) → KNO3 (aq) + AgCl (s) Answer: Products have same mass as reactants, no gas produced

  28. 28.) What type of reaction is this?(Combination, Decomp, Single Ex., Double Ex.) CaCl2(aq) + 2NaOH(aq)  Ca(OH)2(s) + 2NaCl(aq) Answer: Double Exchange

  29. 29.) What type of reaction is this?(Combination, Decomp, Single Ex., Double Ex.) CaCO3 (aq) → CaO (aq) + CO2 (g) Answer: Decomposition

  30. 30.) What type of reaction is this?(Combination, Decomp, Single Ex., Double Ex.) Cl2(g) + 2NaBr(s) → 2NaCl(s) + Br2(s) Answer: Single Exchange

  31. 31.) What type of reaction is this?(Combination, Decomp, Single Ex., Double Ex.) CO2 (g) + NaOH (aq) → NaHCO3 (aq) Answer: Combination

  32. 32.) Which reaction below matches this verbal description?“Liquid mercury boils to produce mercury gas”A.) NH2Cl (g)  NH2Cl (aq)B.) H2SO4 (aq) + CaCO3 (s)  CaSO4 (aq) + CO2 (g) + H2O (l)C.) Hg (l)  Hg (g) D.) CaO (s) + H2O (l)  Ca(OH)2 (s) Answer: C.) Hg (l)  Hg (g)

  33. 33.) Which reaction below matches this verbal description?“A solution of sulfuric acid reacts with solid calcium carbonate to produce a solution of calcium sulfate, carbon dioxide and water.”A.) NH2Cl (g)  NH2Cl (aq)B.) H2SO4 (aq) + CaCO3 (s)  CaSO4 (aq) + CO2 (g) + H2O (l)C.) Hg (l)  Hg (g) D.) CaO (s) + H2O (l)  Ca(OH)2 (s) Answer: B.) H2SO4 (aq) + CaCO3 (s)  CaSO4 (aq) + CO2 (g) + H2O (l)

  34. 34.) Which reaction below matches this verbal description?“Ammonium chloride gas is dissolved in water.”A.) NH2Cl (g)  NH2Cl (aq)B.) H2SO4 (aq) + CaCO3 (s)  CaSO4 (aq) + CO2 (g) + H2O (l)C.) Hg (l)  Hg (g) D.) CaO (s) + H2O (l)  Ca(OH)2 (s) Answer: A.) NH2Cl (g)  NH2Cl (aq)

  35. 35.) Balance the following equation:___ Al + ___ HCl --> ___ AlCl3 + ___ H2 Answer: 2 Al + 6 HCl --> 2 AlCl3 + 3 H2

  36. 36.) Balance the following equation: ___ H2 + ___ N2 ___ NH3 Answer: 3 H2 + 1 N2 2 NH3

  37. 37.) What is the mole ratio between potassium and potassium oxide? 4 K (s) + 1 O2 (g)  2 K2O (s) Answer: 4 moles K = 2 moles K2O

  38. 38.) What is the mole ratio between carbon dioxide and water?2 C6H6 + 15 O2 ---> 12 CO2 + 6 H2O Answer: 12 moles CO2 = 6 moles H2O

  39. 39.) How many moles of water will be produced if 0.45 mol of oxygen reacts according to the following equation: 2 C6H6 + 15 O2 ---> 12 CO2 + 6 H2O Answer: 0.18 moles of water

  40. 40.) How many moles of carbon dioxide will be produced if 1.24 mol of C6H6 reacts according to the following equation: 2 C6H6 + 15 O2 ---> 12 CO2 + 6 H2O Answer: 7.44 moles carbon dioxide

  41. 41.) What is the molarity of a solution of 2.6 moles of sugar in 0.6 liters of solution? Answer: 4.3 M

  42. 42.) How many moles of salt (NaCl) should you dissolve if you want to make a 250 mL solution of 3.0 M NaCl? Answer: 0.75 moles of NaCl

  43. 43.) What final volume would be needed in order to prepare a 0.70 M solution from 0.15 moles of NaNO3 (s)? Answer: 0.214 L

  44. 44.) You put some drops of an unknown solution on to chunk of calcium carbonate, CaCO3. The solution fizzes and bubbles. Is it acid, base or neutral? Answer: Acid

  45. 45.) An unknown solution is tested with universal indicator and has a pH of 10. Is it acid, base or neutral? Answer: Base

  46. 46.) Which of the following substances have neutral pH?A. Ca(NO3)2 B. Mg(OH)2 C. NaClD. NaOH E. HCl F. H2SO4 Answer: A and C

  47. 47.) Which of the following substances have acidic pH?A. Ca(NO3)2 B. Mg(OH)2 C. NaClD. NaOH E. HCl F. H2SO4 Answer: E and F

  48. 48.) Which of these substances would have the highest pH?A. 0.01 M HClB. 0.001 M NaOHC. 0.001 M NaClD. 0.1 M HBrE. 0.01 M KOH Answer: E, 0.01 M KOH

  49. 49.) Which of these substances would have the lowest pH?A. 0.01 M HClB. 0.001 M NaOHC. 0.001 M NaClD. 0.1 M HBrE. 0.01 M KOH Answer: D, 0.1 M HBr

  50. 50.) In order to neutralize hydrochloric acid, HCl, what would you add? Answer: A base

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