* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Document
Stability constants of complexes wikipedia , lookup
Equilibrium chemistry wikipedia , lookup
Acid–base reaction wikipedia , lookup
Chemical equilibrium wikipedia , lookup
Reaction progress kinetic analysis wikipedia , lookup
George S. Hammond wikipedia , lookup
Nanofluidic circuitry wikipedia , lookup
Woodward–Hoffmann rules wikipedia , lookup
Rate equation wikipedia , lookup
Ionic compound wikipedia , lookup
Enzyme catalysis wikipedia , lookup
Industrial catalysts wikipedia , lookup
Electron configuration wikipedia , lookup
Physical organic chemistry wikipedia , lookup
Chemical thermodynamics wikipedia , lookup
Transition state theory wikipedia , lookup
Chemical bond wikipedia , lookup
Electrochemistry wikipedia , lookup
Electrolysis of water wikipedia , lookup
SNC2PI CHEMISTRY UNIT TEST - 2012 - NAME: _________________________________ MARK = /95 **YOU MAY USE YOUR PERIODIC TABLE FROM YOUR NOTES** PART A: MULTIPLE CHOICE (40 marks) Answer the following questions on the Scantron Card provided, in pencil. 1. There is no doubt that a chemical reaction has occurred if: (a) there has been an overall volume change (b) the form or state has been changed (c) a new substance has been formed (d) there has been a change of state 2. The set of elements containing only nonmetals is: (a) I, H, Ag (b) C, Cl, S (c) Al, Sr, K (d) Br, Fe, He 3. The set of elements containing only metals is: (a) Cu, Br, Fe (b) Zn, Li, Ca (c) Sr, Al, Cl (d) K, O, Ag 4. An atom has a total of 18 protons and 18 electrons. These electrons are found in 3 orbits that have: (a) 6 electrons each; (b) 8, 8, and 2 electrons, moving out from the nucleus (c) 2, 8, and 8 electrons, moving out from the nucleus; (d) 2, 10, and 6 electrons, moving out from the nucleus; 5. Which of the following atoms has the electron orbit arrangement “2 in the first orbit, 7 in the second”? (a) Li (b) Cl (c) F (d) Ne 6. An atom becomes a negatively charged ion when it: (a) loses neutrons (b) gains electrons (c) gains protons (d) loses electrons 7. When calcium metal is dropped into water, which gas or gases would be produced? (a) oxygen and carbon dioxide gases (b) hydrogen and oxygen gases (c) hydrogen gas only (d) carbon dioxide gas only 8. What does the " —> " mean in the chemical equation: water —> hydrogen + oxygen (a) reacts with (b) produces (c) a skeleton equation (d) is balanced 9. What does the " + " mean in the chemical equation: phosphorus + oxygen —> diphosphorus pentoxide (a) a skeleton equation (b) to produce (c) reacts with (d) a coefficient 10. In any chemical reaction, the total mass of the reactants is always equal to the total mass of materials produced. This is known as the law of: (a) conservation of mass (b) chemical reactions (c) constant proportion. (d) conservation of energy 11. A balanced chemical equation takes into account the theory that: (a) compounds and elements remain unchanged in a chemical reaction. (b) atoms are neither created nor destroyed in chemical reactions. (c) the total mass always increases during a chemical reaction. (d) the mass of any gases involved can be ignored. -212. Predict the product(s) for the following single displacement reaction. Li + CuO —> _________________ 1. CuLi 2. CuO2 3. Li2O 4. Cu 5. Cu(OLi)2 (a) 3 and 4 only (b) 1 and 2 only 13. 14. (c) 5 only (d) 4 and 5 only In the following equation, the " X " represents: Al2(SO4)3 + Ca(OH)2 —> X + CaSO4 (a) H2O (b) Al (c) Al(OH)3 (d) SO2 Classify the following equation as to reaction type. AgNO3 + NaCl—> NaNO3 + AgCl (a) decomposition (b) double displacement 15. (c) synthesis (d) single displacement What is the reaction type classification for the following equation? 2CaCO3 —> 3CO2 + 2Ca (a) double displacement (b) decomposition 16. (c) synthesis (d) single displacement Which of the following is an example of a single displacement reaction? (a) passing electricity through water to produce oxygen and hydrogen gases; (b) putting copper into oxygen to produce copper (II) oxide; (c) heating calcium carbonate to produce carbon dioxide and calcium oxide; (d) putting sodium into water to produce hydrogen gas and sodium hydroxide; 17. If BaCl2 and Na2SO4 solutions are mixed together, a: (a) single displacement reaction occurs. (b) double displacement reaction occurs. (c) neutralization reaction occurs. (d) synthesis reaction occurs. 18. The products of the following reaction carried out in solution are: Ca(NO3)2 + K2CO3 —> __________________ 1. CaCO3 2. CaK2 3. KNO3 4. CO3(NO3)2 (a) 1 and 3 (b) 1, 2, and 4 (c) 2, 3, and 4 (d) 2 and 4 19. When the following equation is balanced, the coefficients for P and O2 in order are: P + O2 —> P2O5 (a) (b) (c) (d) 6, 4 4, 6 5, 4 4, 5 20. Which of the following equations is correctly balanced? (a) 2H2O —> H2 + O2 (b) HgO —> Hg + O2 (c) C + O2 —> CO2 (d) 2Mg + Cl2 —> MgCl2 21. Metals ‘like’ to: (a) Lose valence electrons to become an anion; (b) Lose valence electrons to become a cation; (c) Gain valence electrons to become neutral; (d) Lose valence electrons to become neutral; 22. Metal and non-metal elements will either lose or gain valence electrons to closely resemble: (a) Halogens (c) alkali metals (b) Noble gases (d) metalloids 23. Incomplete combustion is caused mainly due to: (a) Lack of enough oxygen (b) Not enough fuel (c) Too much heat (d) All of the above 3 24. An example of a double displacement reaction would be: (a) KI + Pb(NO3)2 KNO3 + PbI2 (b) KClO3 KCl + O2 (c) H2 + O2 H2O (d) None of these is a double displacement 25. The product(s) of the complete combustion of a hydrocarbon is/are: (a) water, oxygen, and nitrogen dioxide (b) water only (c) carbon dioxide only (d) water and carbon dioxide 26. Which reaction among the following is NOT a double displacement? (a) H2SO4 + Ca(OH)2 CaSO4 + H2O (b) Zn + HCl ZnCl2 + H2 (c) KOH + HCl KCl + H2O (d) HNO3 + NaOH H2O + NaNO3 Use the following diagrams to answer the next four (4) questions. 1 2 3 4 27. Diagram 1 above represents which of the following? (a) poisonous and infectious causing immediate toxic effects (b) poisonous and infectious causing other toxic effects (c) corrosive material (d) flammable and combustible material 28. Diagram 2 above represents which of the following? (a) poisonous and infectious causing immediate toxic effects (b) poisonous and infectious causing other toxic effects (c) corrosive material (d) flammable and combustible material 29. Diagram 3 above represents which of the following? (a) corrosive warning (b) explosive danger (c) compressed gas (d) biohazardous material 30. Diagram 4 represents which of the following? (a) corrosive warning (b) explosive danger (c) (d) corrosive caution biohazardous material 31. Which one of the following statements is TRUE regarding lab safety? (a) All products used can be washed down the sink. (b) Adding water to spilled acids and bases id the best way to reduce any potential harm. (c) Goggles must be worn only when dealing with chemicals. (d) If you break a piece of glassware, you should pick up all the pieces with your hands. 32. A solid that forms when two liquids are mixed together is called a: (a) precipitate; (c) reactant; (b) solution; (d) electrolyte; 33. When ionic compounds dissolve in water, they form: (a) dissolved ions; (c) electrolytes; (b) homogeneous mixtures (d) all of the choices; 34. Which of the following properties describe a molecular compound? 1. relatively low melting point; 2. very high melting point; 3. could be solid liquid or gas at room temperature depending on the molecule; 4. conducts electricity; 5. always dissolves in water (a) 1 and 3 only (b) 1, 4, and 5 only (c) 1, 2, 3, 4, and 5 (d) 2 and 5 only 4 35. If a group I metal is added to water what product(s) is/are made? (a) hydrogen gas. (b) metal hydroxide. (c) oxygen gas. (d) only (a) and (b). (e) both (b) and (c) 36. Which of the following are correct about ionic bonds? 1. very strong; 2. found between a metal ion and a non-metal ion; 3. are electrostatic attraction; 4. found between two non-metal atoms; 5. are caused by the sharing of valence electrons. (a) 2, 4, and 5 only (b) 2, 3, and 4 only 37. Molecular compounds: (a) have a lower melting point than ionic compounds (b) contain two metal ions (c) 1, 4, and 5 only (d) 1, 2, and 3 only (c) all dissolve in water (d) all of the choices 38. A heterogeneous solution is said to: (a) Have only one phase (layer) (b) Have more than one phase (c) Be a pure substance (d) Both (a) and (c) 39. In order to light a Bunsen burner you must first: (a) Turn on the gas (b) Light the lighter/sparker (c) ‘Choke’ off the air intake to limit oxygen flow (d) Open up the air intake valve to let in more air 40. Examples of Metalloids are: (a) group I and II elements (b) halogens (c) transition metals (d) Boron, Silicon and Antimony **ANSWER EACH OF THE FOLLOWING QUESTIONS IN THE SPACES PROVIDED** PART B: SHORT ANSWER (57 marks) Answer the following questions in the spaces provided. 1. A chemical reaction is represented by the following word equation: magnesium + sulfuric acid —> hydrogen + magnesium sulfate 2. (a) What are the products of this reaction? (2 marks) (b) What are the reactants in this reaction? (2 marks) An unknown white solid is discovered on the lab counter in room 2101. Miss Allen wants to know if it is ionic or covalent. Describe how you could use its properties to determine if it is ionic or covalent. Be sure to use at least 3 specific examples of properties (3 marks) 5 3. Balance the following equations and give the reaction type for each. If the reaction is already balanced write “balanced”: (12 marks, 2 marks each) a) KOH + b) C6H12O6 + c) CuCO3 H 2O NH4NO3 + H20 N2 H 2O + HOH REACTION TYPE: _______________________ CO2 REACTION TYPE: ________________________ CO2 e) REACTION TYPE: ______________________ Li2O + H2 NH4OH + HNO3 Mg3N2 REACTION TYPE: ______________________ REACTION TYPE: _____________________ REACTION TYPE: _________________________ Identify each of the following as either an ionic compound or molecular compound or neither. (3 marks – ½ mark each) (a) (b) (c) (d) (e) (f) 5. CuO + Li + Mg + K2SO4 + O2 —> d) f) 4. H2SO4 —> calcium hydroxide _________ table sugar _________ Na2CO3 __________ magnesium chloride ________ NO3 __________ LiOH __________ The molecule lithium oxide is an ionic compound. (a) Draw the dot diagrams of each atom of this molecule, clearly showing the electron transfer with arrows. (2 marks) (b) Draw what the ions that are formed (use boxes around the ions with their ionic charge). (2 marks) (c) Give the chemical formula for lithium oxide. (1 mark) __________________________________ 6. The molecule oxygen dichloride is a molecular compound. (a) Draw the dot diagrams of each atom of the molecule, clearing showing the bonds. (3 marks) (b) Draw the stick diagram of the molecule (2 marks) 7. 8. Write the balanced chemical equation for the complete combustion of methane (CH4). (4 marks) Examine these electron dot diagrams of three hypothetical elements. X Y Z a) Which element(s) is/are non-metals? How do you know? (2 marks) b) Which element would you predict would NOT react with oxygen? Give reasons to support your answer. (2 marks) 6 9. Draw Bohr diagrams for i) an ATOM of sodium and i) SODIUM ATOM 10. ii) an ION of fluorine. (5 marks) ii) FLUORIDE ION Nomenclature: Fill in the chart in the spaces provided. (8 Marks) 1. Cu2O 2. CaCl2 3. N2O3 4. Hg(OH)2 Formula Name Name Formula 1. iron(II) oxide 2. lithium iodide 3. phosphorus pentabromide 4. sodium carbonate 11. Identify the following pieces of Laboratory equipment. (4 Marks) _____________ _____________ ___________________ _______________ -7+1 +2 +3 -4 -3 -2 -1 Mono: Di: Tri: Tetra: Penta: Hexa: Prefixes one two three four five six Roman Numeral I II III IV V VI Common Polyatomic Ions Negative Polyatomic Ions PO43Phosphate SO42Sulfate CO32Carbonate HCO31bicarbonate NO21Nitrite NO31Nitrate OH1Hydroxide Positive Polyatomic Ions NH41+ Ammonium