Wildcat Chemistry Ionic Bonding Test

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1 Part I. True/False Indicate whether the statement is true or false. Wildcat Chemistry Ionic Bonding Test 1. A cation is a negatively charged atom. 2. In an ionic bond, two cations can bond together to form a compound. 3. When an atom gains electrons, it becomes positively charged. 4. Phosphide is the name of the anion formed when phosphorus gains three electrons. 5. Lithide is the name of the cation formed when lithium loses an electron. 6. Metallic elements tend to form cations rather than anions. 7. An ionic bond is an electrostatic force that holds together oppositely charged atoms in a compound. 8. A crystal lattice is a three-dimensional structure formed by positive ions surrounded by negative ions and negative ions surrounded by positive ions. 9. Because of the number of negative ions packed around each positive ion in a crystal lattice, ionic compounds are good conductors of electricity and heat in their solid state. 10. According to the electron sea model, metals consist of metallic cations surrounded by delocalized valence electrons. 11. A chemical bond results from the interaction between two nuclei. 12. A sodium ion is more stable than a sodium atom. Part II. Multiple Choice Identify the choice that best completes the statement or answers the question. DO NOT WRITE ON THIS TEST! 13.Based on the periodic table shown, elements from columns A and C will combine in which ratio? a. 1 A: 3 C c. 3A:1C b. 1A:1C d. These elements will not combine. 14.Based on the periodic table shown, elements from columns B and F will combine in which ratio? a. 1B:2F c. 2B:3F b. 1B:1F d. These elements will not combine. 15.Based on the periodic table shown, elements from columns B and E will combine in which ratio? a. 2B:3E c. 3B:2E b. 3B:1E d. These elements will not combine.

2 16. In the equation for the formation of magnesium sulfide shown, which atom gains electrons? Mg + S [Mg] 2+ + [S] 2- A B C D a. A c. C b. B d. D 17. Which is the correct formula for the ionic compound that results from these two atoms? X + Y? a. X 2 Y 5 c. X 2 Y 3 b. X 5 Y 2 d. X 3 Y Which is true of the model of bonding shown in this figure? a. Metallic atoms are present in a sea of negatively charged atoms. b. Valence electrons are able to move easily among the metallic cations. c. It results in the substance being very brittle and not easily deformed. d. Heat and electricity are easily carried by the cations from one region to another. 19. Which is the charge that results when oxygen becomes an ion? a. +2 c. +3 b. -3 d Group IIIA elements tend to acquire which charge when they form ions? a. +3 c. +5 b. -5 d Which is true of binary ionic compounds? a. They consist of only two atoms. b. They consist of atoms of only two elements. c. They contain two different anions. d. They have bonds that share two valence electrons. 22. Which is a physical property of ionic compounds in their solid state? a. good conductor of electricity b. weak attractive forces between ions c. low boiling point d. high melting point 23. Which is a property of substances that exhibit metallic bonding? a. high boiling points c. low melting points b. rigid and brittle d. poor conductors of electricity 24. Which is the correct formula for the compound formed between beryllium and nitrogen? a. BeN c. Be 3 N 2 b. Be 3 N d. Be 2 N 3

3 25. What is the correct formula for the compound formed between magnesium and the phosphate ion? a. MgPO 4 c. Mg 3 (PO 4 ) 2 b. Mg 3 PO 2 d. MgP 2 O Which is the correct formula for the compound Manganese (III) Fluoride? a. MnF c. MnF 3 b. Mn 3 F d. Mn 3 F Which is the correct formula for the compound Chromium (II) Nitrate? a. (Cr) 2 NO 3 c. CrNO 2 b. Cr 2 NO 3 d. Cr(NO 3 ) Which is the correct name for the compound FeS? a. Iron Sulfide c. Iron (II) Sulfide b. Iron (I) Sulfide d. Iron (II) Sulfide (II) 29.Which is the correct name for the compound CaClO 2? a. Calcium Chloride c. Calcium Chlorite b. Calcium Chloroxide d. Calcium Chlorate 30. Which is the correct name for the compound Na 3 P? a. Sodium Phosphide c. Sodium Phosphate b. Sodium Phosphite d. Sodium (III) Phosphide 31.Which is the correct name for the compound CoCO 3? a. Carbon Oxygen Carbonate c. Cobalt Carbonate b. Cobalt (II) Carbonate d. Cobalt Carbonoxide 32. Which is the correct name for the compound NH 4 SO 4? a. Nitrogen Hydrogen Sulfate c. Ammonium (II) Sulfate b. Nitrogen Hydrosulfate d. Ammonium Sulfate 33. Noble gases have low reactivity because. a. their outermost energy level can accept only one electron. b. their potential energy is high. c. their electrons are readily exchanged with atoms of other noble gases. d. their outermost energy levels are filled. 34. A potassium. a. atom has a stable octet in its outermost energy level. b. atom will accept an extra electron to look like helium's configuration. c. atom forms a cation when it loses an electron. d. ion combines readily with cations. 35. A fluorine atom. a. has a stable octet in its outermost energy level. b. will accept an extra electron to look like neon's configuration. c. forms a cation when it gains an electron. d. combines readily with anions. 36. The salts NaCl and KBr. a. are good conductors of electricity. b. have positive charges. c. have the same crystal lattice energy. d. are held together by ionic bonds.

4 Part III. Essay Answer as completely as possible. 37. Why do ionic compounds have such high melting points? (2 points) See examples below. Ionic Compound Melting Point o C Covalent Compound Melting Point o C CaI CCl 4-23 MgF H 2 S -86 NaCl 801 CH Under the right conditions, ionic substances can conduct electricity very well. Describe these two conditions and how they allow for conductance. (2 points) 39. Although metals and salts have similar lattice structures, metals make good materials for electrical wiring and salts do not. Give two reasons why because of the characteristics of salts, they aren't used instead. (2 points) 40. Explain why potassium and bromine will react together to form a compound with ionic bonds. Also, be sure to explain what an ionic bond is.(4 points) Hint: Think about electron configurations and stability.

5 Ionic Compounds Answer Section TRUE/FALSE MULTIPLE CHOICE 1.F 2. F 3. F 4. T 5. F 6. T 7.T 8. T 9. F 10. T 11.F 12. T 13.D 14.B 15.C 16. B 17.D 18.B 19.D 20. A 21.B 22.D 23.A 24.C 25.C 26.C 27.D28.C 29.C 30.A 31.B 32. D

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