Gen Chem 1st Quarter Summative Exam PDF

 **GENERAL CHEMISTRY I** **Name:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_Score:\_\_\_\_\_\_\_\_\_\_** **Year/Strand/Section:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Date:\_\_\_\_\_\_\_\_\_\_\_\_ Pare...

 **GENERAL CHEMISTRY I** **Name:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_Score:\_\_\_\_\_\_\_\_\_\_** **Year/Strand/Section:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Date:\_\_\_\_\_\_\_\_\_\_\_\_ Parents Signature:\_\_\_\_\_\_\_\_** **I. Multiple Choice. Choose the letter of the best answer. Write your answers on the space provided.** [ ] 1. What do we call the basic unit of matter? A. Elements B. Compounds C. Atoms D. Molecules \_\_\_\_\_\_\_2. What do we call the type of mixture with only one piece? A. Heterogenous B. Homogeneous C. Pure Substance D. Compounds \_\_\_\_\_\_\_3.. Which of the following statements DOES NOT describe a physical property? A. Hemoglobin molecules have red color. B. Aspirin tablets can be pulverized by hammer. C. Silver salts discolor the skin by reacting with skin protein. D. Mercury is liquid at room temperature. \_\_\_\_\_\_4. Which of the following pairs of properties are BOTH chemical properties? A. Has a high density, is very hard B. Melts at 73°C, flammable C. Good reflector of light, blue in color D. Decomposes upon heating, reacts with chlorine \_\_\_\_\_\_5. Pure water can be separated from inky water by simple distillation because: A. Ink evaporates leaving the water behind B. Water and inks have different boiling points C. Water and ink have different freezing point D. Water evaporates leaving the ink particles behind \_\_\_\_\_\_6. It is the characteristic or trait of matter which is dependent on the amount or quantity? A. Intensive Property B. Extensive Property C. Chemical Property D. Quantitative Property \_\_\_\_\_\_7. Noelle loves the scent the scent of Spider Lilly. One day, Asta decided to extract the scent of it to impress Noelle. However, he does not know what method of separation he should use. What separation technique should Asta use to extract the scent of Spider Lilly? A. Distillation B. Chromatography C. Filtration D. Evaporation \_\_\_\_\_\_8.. Rimuru loves playing slimes. As a habit, he makes a variety of it to play with. During his break, he decided to make a slime that resembles a dragon scales. However, the water that he will be using was contaminated with very fine sand. What should he do to separate the sand in the water? \_\_\_\_\_\_9. Which of the following is NOT an example of mixture? A. Sand and Water B. Salt and Oil C. Cubes in drink D. Water \_\_\_\_\_\_10. Why Chemistry is considered to be the central science? C. Because it overlaps so many sciences D. Because it concerns many areas in our life \_\_\_\_\_\_11. This change in state happens when liquid particles loses energy. a. A. Melting B. Evaporation C. Freezing D. Boiling \_\_\_\_\_\_12. What can we conclude if a 20g sample of Na is weighed three times and recorded the values 22g, 22.1g and 22.2g? A. Accurate and Precise C. Accurate but Not Precise B. Not Accurate but Precise D. Neither Accurate nor Precise \_\_\_\_\_\_13. What conclusion could we draw if a 30g sample of CaCO~3~ yields a measurement of 30g, 30g and 30.1g? A. Accurate and Precise C. Accurate but Not Precise B. Not Accurate but Precise D. Neither Accurate nor Precise \_\_\_\_\_\_14. Which of the following laboratory apparatuses minimized uncertainties in measurements? a. \_\_\_\_\_\_15. How many significant digits are in 80.250 g? a. A. 2 B. 3 C. 4 D.5 \_\_\_\_\_\_16. What is the proper rounding of 4.650 if you want 2 significant digits? a. A. 4.65 B. 4.7 C. 4.6 D. 4.60 \_\_\_\_\_\_17. What is the proper scientific notation of 0.000052? a. A. 5.2 x 10^-5^ B. 5.2 x 10^5^ C. 5.2 x 10^-6^ D. 5.2 x 10^6^ ­­\_\_\_\_\_\_18. An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct? A. An atom of sodium has 11 protons, 11 electrons, and 11 neutrons. B. An atom of sodium has 11 protons, 12 electrons, and 11 neutrons. C. An atom of sodium has 11 protons, 11 electrons, and 12 neutrons. D. An atom of sodium has 11 protons, 12 electrons, and 12 neutrons. \_\_\_\_\_\_19. Which of the following formula indicates not only the numbers of atoms, but also their arrangement in space? A. Empirical formula B. Condensed formula C. Molecular formula D. Structural formula \_\_\_\_\_\_20. What is the chemical formula for Ferric Chromate? A. Fe~2~(CrO4)~3~ B. FeCr~2~O~7~ C. FeCrO~7~ D. Fe~3~(Cr~2~O~7~)~2~ [\_\_\_\_\_\_]21. What is the name of the chemical KI? A. Potassium Iodine B. Potassium Monoiodine C. Potassium Iodide D. None of the Above [\_\_\_\_\_\_]22. What is the name of the chemical Pb~2~(SO~4~)~4~ A. Plumbous Sulfate B. Plumbic Sulfate C. Plumbic Sulfite D. Plumbic Sulfide \_\_\_\_\_\_23. What is the correct name for the compound CoCl2 ? A. Cobalt (I) chlorate B. Cobalt (I) chloride C. Cobalt (II) chlorate D. Cobalt (II) chloride \_\_\_\_\_\_24. Balanced chemical equations imply which of the following? i\. Numbers of molecules are conserved in chemical change. ii\. Numbers of atoms are conserved in chemical change. iii\. Volume is conserved in chemical change. A. i only B. ii only C. i and ii D. i,ii and iii \_\_\_\_\_\_25. The catalytic conversion of ammonia to nitric oxide is the first step in a three-step process, which ultimately results in nitric acid. Which of the following shows the balanced equation for the reaction? **[a]**NH3(g) + **[b]**O2(g) → **[c]**NO(g) + **[d]**H2O(g) A. a = 2, b = 1, c = 2, d = 1 C. a = 4, b = 3, c = 2, d = 6 B. a = 3, b = 2, c = 3, d = 3 D. a = 4, b = 5, c = 4, d = 6 For items 26-28. Refer to the table below. ------------ --------------- ------------- ---------- ---------- ---------- ------------ **Symbol** **Atomic \#** **Mass \#** **p^+^** **e^-^** **n^o^** **Charge** ***Ga*** 31 38 +3 ***Li*** 6 3 2 ***N*** 7 14 4 ***Ne*** 10 10 0 ***Y*** 39 36 49 ***O*** 8 16 -2 ------------ --------------- ------------- ---------- ---------- ---------- ------------ [ ] 26. What is the mass number of Ga? A. 38 B. 31 C. 70 D. 69 [ ] 27. What is the number of neutrons for O? A. 8 B. 16 C. 24 D. 14 \_\_\_\_\_\_\_ [ ] 28. What is the charge of Nitrogen? A. 0 B. -1 C. +2 D. -3 \_\_\_\_\_\_\_29. A sample of the black mineral hematite, an oxide of iron found in many iron ores, contains 34.97g of iron and 15.03g of oxygen. What is the percent composition of this compound? A. %Fe= 34.97; %O= 15.03 C. %Fe= 50.00; %O= 50.00 B. %Fe= 69.94; %O= 30.06 D. Cannot be determined without the chemical formula \_\_\_\_\_\_30. How many moles are there in 425.0 g of strontium chloride? A. 2.6810 mol B. 2.681 mol C. 3.4533 mol D. 3.453 mol \_\_\_\_\_\_32. What is a limiting reagent? A. The reactant that is always in lesser quantity B. The reactant that is used up last and prevents more product from being made C. The reactant that is used up first and prevents more products from being made D. The reactant that is in excess and does not get used up in the reaction \_\_\_\_\_\_33. Which of the following samples has the largest mass, in grams? A. 16 moles of CSe2 B. 17 moles of CN C. 18 moles of H2O D. 19 moles of H2 \_\_\_\_\_\_34. What is the percent composition of C on 257g CaCO~3~? A. 13% B. 10% C. 11% D. 12% \_\_\_\_\_\_35. How many moles of CaCO~3~ is present at that 257g sample? A. 0.39 mol B. 2.57 mol C. 21.42 mol D. 0.046 mol \_\_\_\_\_\_36. How many particles are there in a 320g Calcium? A. 4.8176x10^23^ B. 4.8176x10^24^ C. 7.5275x10^22^ D. 7.5275x10^23^ \_\_\_\_\_\_37. How many moles of Oxygen are there in 1 mole of Ca(NO3)3.? A. 6 mole B. 3 mole C. 5 mole D. 1 mole \_\_\_\_\_\_38. Aurora loves everything with ice so she always has a stock of ice cube. How many H~2~O molecules are there in an ice cube weighing 1 mg? A. 3.35 x 10^19^  B. 3.36 x 10^19^  C. 3.35 x 10^20^  D. 3.36 x 10^20^  \_\_\_\_\_\_39. The reaction CH4+2O2→CO2+2H2OCH4+2O2→CO2+2H2O produced 3.86g of water. How many moles of methane were used in this reaction? A. 0.0107 moles  B. 0.107 moles  C. 0.1007 moles  D. 0.170 moles  \_\_\_\_\_\_40. A given mass of air has a volume of 6.00 L at 101 atm. At constant temperature, the pressure is decreased to 25.0 atm. Calculate the final volume for the gas, as described by Boyle\'s law. A. 1.50 L B. 6.00 L C. 20.0 L D. 24.2 L \_\_\_\_\_\_41. What is the volume, in liters, occupied by 1.73 moles of N2 gas at 0.992 atm pressure and a temperature of 75ºC? A. 10.7 L B. 33.8 L C. 49.8 L D. 52.2 L \_\_\_\_\_\_42. How will the volume of 0.50 mol of a gas behave if the temperature is raised from 30oC to 60oC at constant pressure? A. It will increase. B. It will decrease. C. It will be doubled. D. It will be halved. \_\_\_\_\_\_43. What would be the temperature of 2.49 moles of gas contained in a 1.00-L vessel at a pressure of 143 kPa? A. 6.90°C B. 700°C C. 6.90 K D. 700 K \_\_\_\_\_\_44. Which of the following refers to the statement of Charles' Law? A. The relationship of volume and pressure of a gas is inversely proportional. B. The relationship of volume and pressure of a gas is directly proportional. C. The relationship of temperature and volume of a gas is directly proportional. D. The relationship of temperature and volume of a gas is inversely proportional. \_\_\_\_\_\_\_45. How is the partial pressure of a gas in a mixture calculated? A. Divide the total pressure by the molar mass of the gas. B. Divide the temperature of the gas by the volume. C. Subtract the partial pressures of the other gases from the total pressure. D. Add the partial pressures of the other gases to the total pressure. \_\_\_\_\_\_46. The temperature of an ideal gas is doubled from 200 K to 400 K while the volume is kept constant. According to kinetic theory, which changes occur to the particles that make up the gas? A. Their speed increases and the average distance between them increases. B. Their mass increases and their speed increases. C. Their speed increases while their collision rate increases. D. Their speed decreases while their collision rate increases. \_\_\_\_\_\_47. Which of the following postulates of the Kinetic Molecular Theory for gases can explain why gases exhibit pressure? A. The molecules are in constant random motion. B. The molecules collide with the walls of the vessel. C. The distance between the molecules is great. D. The molecular kinetic energy depends on temperature. \_\_\_\_\_\_48. How will the velocity of a gas molecule vary if its molecular weight is increased from 32 g/mol to 64 g/mol? A. The velocity will increase C. The velocity will double B. The velocity will decrease D. The velocity will remain the same \_\_\_\_\_\_49. When a 375 mL sample of nitrogen is kept at constant temperature, it has a pressure of 1.2 atm. What pressure does it A. 3 atm B. 0.4 atm C. 3.6 atm D. 2.5 atm \_\_\_\_\_\_50. A chemist produces 460mL of Oxygen gas at -43°C and a constant pressure. To what kelvin temperature must the A. 320 B. 1121.73 K C. 313 K D. 164.83 K \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*END OF EXAMINATION\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*