a. ionic compounds have low melting points; covalent compounds have high melting points\nb. ionic compounds…

a. ionic compounds have low melting points; covalent compounds have high melting points\nb. ionic compounds conduct electricity when dissolved; covalent compounds usually do not\nc. ionic compounds are made of nonmetals only; covalent compounds are made of metals and nonmetals\nd. ionic compounds share electrons; covalent compounds transfer electrons\nq7. why does fluorine (f) form an anion?\na. it loses electrons to become stable\nb. it gains one electron to complete its octet\nc. it has a full outer shell naturally\nd. it shares four electrons with another atom\nq8. what is the correct formula for a compound of aluminum and nitrogen?\na. aln\nb. al₂n\nc. aln₂\nd. al₂n₃\nq9. what is the correct formula for dinitrogen tetroxide?\na. no₂\nb. n₂o₄\nc. no₄\nd. n₂o\ndok 3 - strategic thinking\nq10. why do noble gases usually not form compounds?\na. they are metals and unstable\nb. they have full outer electron shells\nc. they prefer ionic bonds only\nd. they contain no protons\nq11. a student says nacl is covalent. which is the best evaluation?\na. correct, because na and cl share electrons\nb. incorrect, because nacl is ionic (metal + nonmetal)\nc. correct, because nacl has weak bonds\nd. incorrect, because nacl is a mixture\nq12. why is mgf₂ the correct formula for magnesium fluoride?

a. ionic compounds have low melting points; covalent compounds have high melting points\nb. ionic compounds conduct electricity when dissolved; covalent compounds usually do not\nc. ionic compounds are made of nonmetals only; covalent compounds are made of metals and nonmetals\nd. ionic compounds share electrons; covalent compounds transfer electrons\nq7. why does fluorine (f) form an anion?\na. it loses electrons to become stable\nb. it gains one electron to complete its octet\nc. it has a full outer shell naturally\nd. it shares four electrons with another atom\nq8. what is the correct formula for a compound of aluminum and nitrogen?\na. aln\nb. al₂n\nc. aln₂\nd. al₂n₃\nq9. what is the correct formula for dinitrogen tetroxide?\na. no₂\nb. n₂o₄\nc. no₄\nd. n₂o\ndok 3 - strategic thinking\nq10. why do noble gases usually not form compounds?\na. they are metals and unstable\nb. they have full outer electron shells\nc. they prefer ionic bonds only\nd. they contain no protons\nq11. a student says nacl is covalent. which is the best evaluation?\na. correct, because na and cl share electrons\nb. incorrect, because nacl is ionic (metal + nonmetal)\nc. correct, because nacl has weak bonds\nd. incorrect, because nacl is a mixture\nq12. why is mgf₂ the correct formula for magnesium fluoride?

Answer

Brief Explanations:

  • Q6: Ionic compounds conduct electricity when dissolved due to the presence of ions that can move freely. Covalent compounds usually do not as they consist of neutral molecules.
  • Q7: Fluorine has 7 valence electrons and gains one electron to complete its octet and form an anion.
  • Q8: Aluminum has a +3 charge and nitrogen has a -3 charge, so the formula is AlN to balance charges.
  • Q9: Dinitrogen tetroxide has 2 nitrogen atoms and 4 oxygen atoms, so the formula is N₂O₄.
  • Q10: Noble gases have full outer electron shells, making them stable and less likely to form compounds.
  • Q11: NaCl is an ionic compound as it is formed between a metal (Na) and a non - metal (Cl) through electron transfer.
  • Q12: Magnesium has a +2 charge and fluorine has a -1 charge. To balance charges, 2 fluorine atoms are needed for each magnesium atom, giving the formula MgF₂.

Answer:

  • Q6: B. Ionic compounds conduct electricity when dissolved; covalent compounds usually do not
  • Q7: B. It gains one electron to complete its octet
  • Q8: A. AlN
  • Q9: B. N₂O₄
  • Q10: B. They have full outer electron shells
  • Q11: B. Incorrect, because NaCl is ionic (metal + nonmetal)
  • Q12: Magnesium has a +2 charge and fluorine has a -1 charge. Two fluorine atoms are needed to balance the +2 charge of one magnesium atom.