6.
salts are also knows as

atoms

elements

covalent compounds

ionic compounds

7.
the compound co is an example of a(n)

salt

element

ionic compound

covalent compound

8.
hydrogen is a nonmetal and oxygen is a nonmetal. if these two elements were to bond, they would form a(n)

covalent compound

ionic compound

element

salt

9.
which of the following is not a characteristic of an ionic compound?

it is a solid.

it has a high melting point.

it is formed when atoms share electrons.

it is made of a metal and a nonmetal.

10.
the compound h2o is an example of a(n)

metallic compound

covalent compound

ionic compound

element

6. Think of NaCl, or table salt. What's the bond between NaCl? It's an ionic bond, so salts are ionic compounds. Ionic compounds refer to the electrostaticity that holds the Na atom and Cl bond together. 

7. See what CO isn't first. Carbon monoxide is a gas, not a salt. And carbon monoxide is a compound, since it's made of two different elements. Since there isn't too much of electronegativity difference, CO isn't an ionic compound, so that leaves you with CO being a covalent compound.

8. If a metal + nonmetal bond, it's ionic. If it's a nonmetal + nonmetal, it's a covalent compound. 

9. Ionic compounds are usually solid at room temperature-think back to NaCl like I mentioned earlier. Since there's a strong bond between the atoms in ionic compounds, it has a high melting point. Like I said earlier, ionic compounds are between metals and nonmetals. So...In ionic compounds, electrons are NOT shared. With NaCl for example, Na gives its extra electron to Cl. So it would be the third choice.

10. H2O doesn't have a metal in it, so it's not a metallic compound. H2O isn't ionic either; it's made of two nonmetals. It's also not an element, since H2O is a compound. So...if H2O is made of two nonmetals, it should be a covalent compound! 

The answer is d have a nice day