Science 1206 ESA Prep Week Worksheet 2 Chemical Reactions PDF

SCIENCE 1206 ESA PREP WEEK WORKSHEET 2: CHEMICAL REACTIONS STUDENT NAME: PART A: MULTIPLE CHOICE 1. How does a person safely smell a chemical in the lab (A) Smell it slowly (B) Inhale the fumes di...

SCIENCE 1206 ESA PREP WEEK WORKSHEET 2: CHEMICAL REACTIONS STUDENT NAME: PART A: MULTIPLE CHOICE 1. How does a person safely smell a chemical in the lab (A) Smell it slowly (B) Inhale the fumes directly from the container (C) Heat the substance before smelling (D) Gently wave the fumes toward your nose using a wafting motion 2. What does the acronym WHMIS stand for? (A) Workplace transportation guide (B) Environmental system (C) Workplace hazardous materials information system (D) Workplace hazardous waste disposal system 3. Which of the following gives employers and workers the information to protect themselves from hazards and for safe handling and use? (A) Periodic Table (B) Safety Data sheet (C) Physics Formula Sheet (D) Weather Data Collection Sheet 4. What category of hazardous substance does this symbol represent? (A) Dangerously reactive (B) Flammable (C) Oxidizing material (D) Toxic 5. Which statement about the atom’s nucleus is correct? (A) The nucleus is made of protons and neutrons and has a negative charge. (B) The nucleus is made of electrons and has a negative charge. (C) The nucleus is made of protons and neutrons and has a positive charge. (D) The nucleus is made of electrons and has a positive charge. 6. Boron’s atomic number is 5. Which of the following is always true for Boron? (A) Five neutrons in its nucleus. (B) Total of five neutrons and electrons. (C) Five protons in its nucleus. (D) Total of five protons and neutrons. 7. Which of these correctly indicates the energy levels for chlorine atoms? 1st Level 2nd Level 3rd Level (A) 2 7 8 (B) 2 8 7 (C) 8 7 2 (D) 7 5 2 1 8. How many valence electrons does an atom of phosphorus have? (A) 1 (B) 3 (C) 5 (D) 15 9. Which of the following is true of ions? (A) Metals lose electrons to become negatively charged (B) Nonmetals gain electrons to become positively charged (C) Metals gain electrons to become negatively charged (D) Atoms gain or lose electrons to gain the stable structure of the nearest noble gas 10. How many electrons does a sodium ion contain? (A) 8 (B) 10 (C) 11 (D) 12 11. What does N3- indicate about the anion? (A) It gained 3 electrons (B) It lost 3 electrons (C) It gained 3 protons (D) It lost 3 protons 12. What ending does an anion receive? (A) Ide (B) Ium (C) Tetra (D) Octa 13. What term refers to elements in each vertical column on the periodic table that have similar properties? (A) Period (B) Group (C) Element (D) Property 14. How would you locate Sodium on the periodic table? (A) Group 2, Period 4 (B) Group 4, Period 2 (C) Group 3, Period 1 (C) Group 1, Period 3 15. Which element is diatomic? (A) Helium (B) Iodine (C) Phosphorus (D) Sulfur 2 16. Which set of elements contains only nonmetals? (A) I, H, Ag (B) Al, Sr, K (C) C, Cl, Li (D) Sl, S, P 17. What ion contains 18 electrons and 16 protons? (A) Sulfide Ion (B) Argon Ion (C) Calcium Ion (D) Chloride Ion 18. Which element naturally exists as a diatomic molecule? (A) Magnesium (B) Lead (C) Sulfur (D) Fluorine 19. Which of the following is a molecular compound? (A) NaCl (B) CsF (C) MgO (D) H2O2 20. What is the common name for NH3? (A) Ammonia (B) Ammonium (C) Methanol (D) Pneumonia 21. What is the correct formula for trinitrogen nonabromide? (A) N9Br3 (B) N3Br9 (C) N3Br10 (D) N2Br9 22. What prefix is used for a compound that has 8 atoms of a particular element? (A) Hepta (B) Tri (C) Nona (D) Octa 23. Which of the following is true for a molecular compound? (A) Composed of two or more transition elements (B) Composed of a cation and an anion (C) Composed nonmetallic elements (D) Composed of elements that transfer electrons 3 24. Which is an ionic compound? (A) CaCO3 (B) CH4 (C) H2O (D) H2O2 25. Which is the correct formula for sodium bromide? (A) NaBr (B) Na2Br2 (C) NaBr2 (D) HNaBr 26. What does the roman numeral (III) in the name iron (III) oxide indicate? (A) There are three times as many iron atoms present than oxygen atoms. (B) There are three iron atoms per formula unit. (C) There are three oxygen atoms per formula unit. (D) Iron ions present have a charge of 3+. 27. Which of the following is the correct formula for tin (IV) bromide? (A) SnBr2 (B) SnBr4 (C) SnBr5 (D) Sn4Br 28. What is the correct formula for calcium nitrate? (A) Ca(NO3)3 (B) Ca3NO3 (C) Ca(NO3)2 (D) Ca2NO3 29. What is the formula for the salt formed from Ca2+ and PO43-? (A) CaPO4 (B) Ca2(PO4)3 (C) Ca2PO4 (D) Ca3(PO4)2 30. What is the name for NH4CN? (A) Ammonia cyanide (B) Ammonium cyanide (C) Ammonium (I) cyanide (D) Nitrogen cyanide tetrahydrate 31. Which of the following is true about covalent compounds? (A) They could be a solid, liquid, or gas at room temperature. (B) They never dissolve in water. (C) They always contain at least one metal atom. (D) They are the result of atoms transferring electrons to become oppositely charged. 4 32. Which of the following is the best method determining if a substance is ionic or covalent? (A) Colour (B) Conductivity (C) Precipitate forms (D) Solubility 33. Which of the following is an example of a chemical change? (A) Cutting wood (B) Ice cubes melting (C) Frost build up on a window (D) Wood rotting 34. Which of the following is an example of a physical change? (A) Rust (B) Evaporation (C) Explosion (D) Food spoiling 35. Which of the following unbalanced reactions is a double replacement reaction? (A) V2O5 + Ca → CaO + V (B) Sn + O2 → SnO (C) MgCl2 → Mg + Cl2 (D) H2S + PbCl2 → PbS + HCl 36. When Hydrogen gas reacts with Oxygen gas, water is created. What type of reaction is this? (A) Single Replacement (B) Formation (C) Double Replacement (D) Decomposition 37. What are the products for the combustion of a hydrocarbon? (A) Carbon and hydrogen (B) Carbon and water vapour (C) Carbon monoxide and water vapour (D) Carbon dioxide and water vapour 38. If aqueous sodium hydroxide reacts with a solution of aluminum nitrate, what type of reaction occurs? (A) Double replacement (B) Formation (C) Hydrocarbon combustion (D) Single replacement 39. Which of the following states that "Matter cannot be created nor destroyed."? (A) Law of Conservation of Energy (B) Law of Conservation of Mass (C) Law of Thermodynamics (D) Newton's First Law 5 40. Which of the following observations would NOT necessarily indicate that a chemical reaction has occurred? (A) Heat is released (B) Color change (C) Precipitate formed (D) Solutions mixed Use the reaction below to answer questions 41 to 43 ? ___ Al2(SO4)3 + ___ BaBr2 → ___BaSO4 + ___ AlBr3 41. In the correct order, which coefficients balance this equation? (A) 1, 1, 4, 1 (B) 1, 2, 2, 2 (C) 1, 3, 3, 2 (D) 2, 3, 3, 1 42. Which of the following would decrease the reaction rate? (A) Increase the temperature (B) ]Increase the amount of BaSO4 (C) Decrease the amount of BaBr2 (D) Increase the surface area of Al2(SO4)3 43. How would you increase the rate of reaction? (A) Decrease the temperature (B) Decrease the amount of BaBr2 (C) Increase the amount of AlBr3 (D) Increase the surface area of Al2(SO4)3 44. The pH of a solution is measured to be 1.0. Which best describes this solution? (A) Strong acid (B) Strong base (C) Weak acid (D) Weak base 45. Which of the following correctly describes the properties of a base? (A) Tastes bitter, turns blue litmus paper red (B) Tastes bitter, turns red litmus paper blue (C) Tastes sour, turns red litmus paper blue (D) Tastes sour, turns blue litmus paper red 46. Which of the following compounds, when dissolved in water, will form a base? (A) NaCl (B) NaOH (C) HC (D) NH4 47. Which compound will turn red litmus paper blue when it dissolves in water? (A) CH3OH (B) HCl (C) CO2 (D) LiOH 6 PART B: Constructed Response 1. Draw Bohr diagrams for the following atoms or ions, including the symbol of the atom or ion a) an oxygen atom b) a calcium ion 2. Write the chemical name for each of the following (A) S5N9 (B) Cl2 (C) KCl (D) Cu2S (E) NCl3 (F) Pb(CO3)2 (G) MgBr2 (H) Ca(OH)2 (I) CoO (J) (NH4)2O 3. Write the chemical formula for each of the following (A) octanitrogen tetraoxide (B) cesium sulfide (C) trisulfur pentafluoride (D) iron (III) oxide (E) sodium phosphate (F) fluorine (G) lithium carbonate (H) aluminum bromide (I) iron(II) nitrate 7  (J) ammonium nitrate (K) sucrose 4. In the lab you were given two beakers, each containing a white crystalline solid. One solid is Sodium Chloride, and the other is Sucrose (sugar). Explain what tests you can run on these two substances to determine which is salt and which is sugar. Ensure that you follow lab safety guidelines. 5. Write balanced chemical equations for each of the following. Reaction Type Balance (A) ____ P4 + ____ Br2 ➝ ____ PBr3 (B) ____ PbBr2 + ____ HCl ➝ ____ HBr + ____ PbCl2 (C) ____ Ca(OH)2 + _____ HCl (aq) → _____ CaCl2 + _____ HOH (D) ____ Fe2O3 → _____ Fe + _____ O2 (F) ______ Ag + _____ Cu2SO4 → _____ Cu + _____ Ag2SO4 (G) _____C5H12 + ____ O2 → _____ CO2 + _____ H20 6. Using what we have learned about reaction rates explain the following situation (A) The instructions on a particular brand of pizza dough states that once the flour, baking powder and water are mixed into dough, the dough is to be placed in a warm area for 15 minutes for the dough to rise before completing the pizza. Why would a warm area be important? (B) When camping, why would a fire be started using finely chopped kindling compared to using just blocks of wood at the start? 8 7. Substance X conducts electricity and when substance X comes into contact with skin it feels slippery and a small burn occurs. When a piece of magnesium metal is added to substance X, and no bubbles were observed (A) Is substance X acidic, basic or neutral? (B) Explain/Give two examples of how you could test your choice from question a. 9