CHOOSE 3 and DECIDE IETHEY ARE COVALENT or IONIC H+H=H [1] Mg+Cl2=MgCl2 [2] 2C+2H2=C2H4 [3] 4K+O2=2K2O [4] 2Ca+O2=2CaO 4Al+3O2=2Al2O3 [6] 2H2+O2=2H2O Cl+Cl=Cl2 [B] H2+Cl2=2HCl2 [9] 2Na+Cl2=2NaCl 3H2+2N=2NH3 2H2+C=CH4 [12] O2+C=CO2 [13] Al+3F=AlF3 [14]

To determine whether a chemical reaction is covalent or ionic, we need to look at the types of elements involved and the nature of the bond formed.1. : This is a covalent bond because both hydrogen atoms are nonmetals and they share electrons to form a molecule of hydrogen.2. : This is an ionic bond because magnesium is a metal and chlorine is a nonmetal. Magnesium loses electrons to chlorine, forming an ionic compound.3. : This is a covalent bond because both carbon and hydrogen are nonmetals and they share electrons to form a molecule of ethylene.4. : This is an ionic bond because potassium is a metal and oxygen is a nonmetal. Potassium loses electrons to oxygen, forming an ionic compound.5. : This is an ionic bond because calcium is a metal and oxygen is a nonmetal. Calcium loses electrons to oxygen, forming an ionic compound.6. : This is an ionic bond because aluminum is a metal and oxygen is a nonmetal. Aluminum loses electrons to oxygen, forming an ionic compound.7. : This is a covalent bond because both hydrogen and oxygen are nonmetals and they share electrons to form a molecule of water.8. : This is a covalent bond because both chlorine atoms are nonmetals and they share electrons to form a molecule of chlorine.9. : This is a covalent bond because both hydrogen and chlorine are nonmetals and they share electrons to form a molecule of hydrogen chloride.10. : This is an ionic bond because sodium is a metal and chlorine is a nonmetal. Sodium loses electrons to chlorine, forming an ionic compound.11. : This is a covalent bond because both hydrogen and nitrogen are nonmetals and they share electrons to form a molecule of ammonia.12. : This is a covalent bond because both hydrogen and carbon are nonmetals and they share electrons to form a molecule of methane.13. : This is a covalent bond because both oxygen and carbon are nonmetals and they share electrons to form a molecule of carbon dioxide.14. : This is an ionic bond because aluminum is a metal and fluorine is a nonmetal. Aluminum loses electrons to fluorine, forming an ionic compound.