Formation of Ionic and Molecular Compounds
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1 Student Name Class Formation of Ionic and Molecular Compounds 1. Compounds are formed when elements combine in different chemical reactions. This identifies which elements combine and how many of them are present in the compound. A. Atomic Number B. Chemical Name C. Atomic Mass Unit D. Chemical Formula 2. In the formula for baking soda NaHCO 3(s) the following indicates how many atoms are present in each molecule A. 1 atom of each element B. 1 sodium, 1 hydrogen, 3 carbon dioxide C. 1 sodium, 1 hydrogen, 1 carbon, 3 oxygen D. 1 sodium, 1 hydrogen, 1 calcium and 3 oxygen 3. In the formula for baking soda NaHCO 3(s) the (s) indicates that this molecule is A. safe B. solid C. stable D. strong 4. Pure substances formed as a result of the attraction between charged particles of opposite charges are A. Stable elements B. Ionic compounds C. Charged elements D. Molecular compounds 5. When ionic compounds are formed, the ions combine to form a A. cloud B. block C. crystal D. irregular pattern 6. When sodium (a very reactive metal) is placed in chlorine (a green gas), the sodium explodes with a bright yellow flame. As it burns, this white, coarse-grained powder is produced. A. silicon B. carbon C. alum D. salt 7. When naming ionic compounds there are two rules to remember: The first is that the name of the metal is always placed first, the second is the name of the non-metal ion(s) changes to. A. ous B. ade C. ide D. ate 8. The ion charges of a particular element will help you determine the chemical formula for the compound that is formed. Calcium [ Ca 2+ ] combines with chlorine [ Cl 1- ] to produce Calcium Chloride. The correct formula for Calcium Chloride is A. Ca 2Cl B. CaCl 2 C. 2CaCl D. Ca2Cl
2 9. The alkali metals include Lithium and Sodium, each having an ion charge of 1+, are often reactive with the elements that have an ion charge of 1-. The group of elements that alkali metals react with are called the A. Halogens B. Metalloids C. Non-Metals D. Earth Metals 10. This type of lattice structure represents the compound, sodium chloride. The characteristic that identifies this compound as an ionic compound is its distinct crystal A. size B. shape C. ion D. element 11. N 2O 3 is a molecular compound. The chemical name - following the rules for naming molecular compounds for N 2O 3 is A. trinitrogen oxide B. dinitrogen oxide C. trinitrogen dioxide D. dinitrogen trioxide 12. Sugar C 12H 22O 11 is a molecular compound. This compound contains A. 3 calcium atoms, 4 helium atoms and 2 organic atoms B. 3 carbon atoms, 4 hydrogen atoms and 2 oxygen atoms C. 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms D. 12 calcium atoms, 22 helium atoms and 11 oxidizing atoms 13. Use the information in the following table to answer this question. Compound Formula Melting Point o C Boiling Point o C baking soda NaHCO o 1550 o carbon dioxide CO 2 sublimates -79 o rubbing alcohol CO 3H 8O -90 o 82 o salt NaCl 801 o 1413 o The molecular compounds from the table above are A. baking soda and salt B. rubbing alcohol and salt C. carbon dioxide and baking soda D. carbon dioxide and rubbing alcohol 14. A Tetra Pak is a drink container that is used by manufacturers to provide juice in a handy convenient format. Tetra means A. four B. wax paper C. recyclable D. convenient 15. The only compound that contains three elements is A. H 2O (l) Water B. C 6H 12O 6(s) Glucose C. CO 2(g) Carbon dioxide D. NO 2(g) Nitrogen dioxide
3 16. The chemical formula uses symbols and numerals to identify which elements and how many atoms of each element are present in the compound. The chemical formula for ethanol A. C 2 H 6 O B. H 3CH 2 COH C. C 2 3H 2 O D. H 2 HC 2 OH H 2 would be written as 17. In molecular pure substances the bonding between atoms is strong, but the attraction between the molecules is weak. They are good insulators, poor conductors and have a distinct crystal shape. This type of molecular compound is produced when A. metals combine B. non-metals combine C. gases and solids combine D. non-metals and metals combine 18. Some molecular compounds are better known by their common names rather than their chemical names, example: water H2O is actually A. hydroxide B. dihydroxide C. hydrogen dioxide D. dihydrogen oxide 19. When dissolved in water, the metal (Na) loses an electron and the nonmetal (Cl 2 ) gains an electron forming an aqueous solution of ions like these A. (Na)+ (Cl 2) + B. (Na)- (Cl 2) + C. (Na)+ (Cl 2) - D. (Na)- (Cl 2) Some ions can also form when certain atoms of elements combine. These ions are called polyatomic ions (poly meaning many ). Polyatomic atoms are a group of atoms acting as one. The compound that contains a polyatomic ion is A. H 2O (l) B. NaCl (s) C. C 6H 12O 6(s) D. CaCO 3(s) 21. Some compounds of copper such as Copper II Sulfate used use a roman numeral in its chemical name. Cu(II)SO 4 The roman numeral is used to show A. which ion is used B. how the ion is used C. the order of ions used D. how many ions are used 22. The formula for carbon tetrachloride is A. C 4Cl B. CCl 4 C. C 4Cl 4 D. Cl 4C
4 23. Show how the following ionic compound is formed (use Bohr s Atomic Model) Use the following except from the periodic table to help you decide on what the atomic model looks like for each of the elements in the ionic compound. 20 Ca Cl 1- Calcium 40.1 CaCl 2 Calcium Chloride Chlorine 35.5 ANSWER
5 Student Name Class ANSWER KEY Formation of Ionic and Molecular Compounds 1. Compounds are formed when elements combine in different chemical reactions. This identifies which elements combine and how many of them are present in the compound. A. Atomic Number B. Chemical Name C. Atomic Mass Unit D. Chemical Formula 2. In the formula for baking soda NaHCO 3(s) the following indicates how many atoms are present in each molecule A. 1 atom of each element B. 1 sodium, 1 hydrogen, 3 carbon dioxide C. 1 sodium, 1 hydrogen, 1 carbon, 3 oxygen D. 1 sodium, 1 hydrogen, 1 calcium and 3 oxygen 3. In the formula for baking soda NaHCO 3(s) the (s) indicates that this molecule is A. safe B. solid C. stable D. strong 4. Pure substances formed as a result of the attraction between charged particles of opposite charges are A. Stable elements B. Ionic compounds C. Charged elements D. Molecular compounds 5. When ionic compounds are formed, the ions combine to form a A. cloud B. block C. crystal D. irregular pattern 6. When sodium (a very reactive metal) is placed in chlorine (a green gas), the sodium explodes with a bright yellow flame. As it burns, this white, coarse-grained powder is produced. A. silicon B. carbon C. alum D. salt 7. When naming ionic compounds there are two rules to remember: The first is that the name of the metal is always placed first, the second is the name of the non-metal ion(s) changes to. A. ous B. ade C. ide D. ate 8. The ion charges of a particular element will help you determine the chemical formula for the compound that is formed. Calcium [ Ca 2+ ] combines with chlorine [ Cl 1- ] to produce Calcium Chloride. The correct formula for Calcium Chloride is A. Ca 2Cl B. CaCl 2 C. 2CaCl D. Ca2Cl
6 9. The alkali metals include Lithium and Sodium, each having an ion charge of 1+, are often reactive with the elements that have an ion charge of 1-. The group of elements that alkali metals react with are called the A. Halogens B. Metalloids C. Non-Metals D. Earth Metals 10. This type of lattice structure represents the compound, sodium chloride. The characteristic that identifies this compound as an ionic compound is its distinct crystal A. size B. shape C. ion D. element 11. N 2O 3 is a molecular compound. The chemical name - following the rules for naming molecular compounds for N 2O 3 is A. trinitrogen oxide B. dinitrogen oxide C. trinitrogen dioxide D. dinitrogen trioxide 12. Sugar C 12H 22O 11 is a molecular compound. This compound contains A. 3 calcium atoms, 4 helium atoms and 2 organic atoms B. 3 carbon atoms, 4 hydrogen atoms and 2 oxygen atoms C. 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms D. 12 calcium atoms, 22 helium atoms and 11 oxidizing atoms 13. Use the information in the following table to answer this question. Compound Formula Melting Point o C Boiling Point o C baking soda NaHCO o 1550 o carbon dioxide CO 2 sublimates -79 o rubbing alcohol CO 3H 8O -90 o 82 o salt NaCl 801 o 1413 o The molecular compounds from the table above are A. baking soda and salt B. rubbing alcohol and salt C. carbon dioxide and baking soda D. carbon dioxide and rubbing alcohol 14. A Tetra Pak is a drink container that is used by manufacturers to provide juice in a handy convenient format. Tetra means A. four B. wax paper C. recyclable D. convenient 15. The only compound that contains three elements is A. H 2O (l) Water B. C 6H 12O 6(s) Glucose C. CO 2(g) Carbon dioxide D. NO 2(g) Nitrogen dioxide
7 16. The chemical formula uses symbols and numerals to identify which elements and how many atoms of each element are present in the compound. The chemical formula for ethanol A. C 2 H 6 O B. H 3CH 2 COH C. C 2 3H 2 O D. H 2 HC 2 OH H 2 would be written as 17. In molecular pure substances the bonding between atoms is strong, but the attraction between the molecules is weak. They are good insulators, poor conductors and have a distinct crystal shape. This type of molecular compound is produced when A. metals combine B. non-metals combine C. gases and solids combine D. non-metals and metals combine 18. Some molecular compounds are better known by their common names rather than their chemical names, example: water H2O is actually A. hydroxide B. dihydroxide C. hydrogen dioxide D. dihydrogen oxide 19. When dissolved in water, the metal (Na) loses an electron and the nonmetal (Cl 2 ) gains an electron forming an aqueous solution of ions like these A. (Na)+ (Cl 2) + B. (Na)- (Cl 2) + C. (Na)+ (Cl 2) - D. (Na)- (Cl 2) Some ions can also form when certain atoms of elements combine. These ions are called polyatomic ions (poly meaning many ). Polyatomic atoms are a group of atoms acting as one. The compound that contains a polyatomic ion is A. H 2O (l) B. NaCl (s) C. C 6H 12O 6(s) D. CaCO 3(s) 21. Some compounds of copper such as Copper II Sulfate used use a roman numeral in its chemical name. Cu(II)SO 4 The roman numeral is used to show A. which ion is used B. how the ion is used C. the order of ions used D. how many ions are used 22. The formula for carbon tetrachloride is A. C 4Cl B. CCl 4 C. C 4Cl 4 D. Cl 4C
8 23. Show how the following ionic compound is formed (use Bohr s Atomic Model) Use the following except from the periodic table to help you decide on what the atomic model looks like for each of the elements in the ionic compound. 20 Ca Cl 1- Calcium 40.1 CaCl 2 Calcium Chloride Chlorine 35.5 ANSWER
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