Question

prop 518 quiz
complete the prop 518 quiz by october 14, 2025 at 11:59pm. you will have one attempt and only 20 minutes to complete the quiz.
1 essay 2 points
your samples contained silicon dioxide, sodium chloride, and calcium carbonate. classify each substance as element, compound, molecule or ionic compound (list all that apply for each substance).
a. sio₂ b. nacl c. caco₃
example: kcl - compound, molecule and ionic compound.
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12pt paragraph b i u a t²

Explanation:

An element is a pure substance made of only one type of atom. A compound is a substance formed from two or more elements chemically joined. A molecule is a group of two or more atoms held together by chemical bonds. An ionic compound is a compound made up of ions.

• Silicon dioxide ($SiO_2$): It is composed of silicon and oxygen atoms chemically bonded, so it is a compound and a molecule.
• Sodium chloride ($NaCl$): It is formed from sodium and chlorine. It is a compound, and because it consists of sodium cations and chloride anions, it is also an ionic compound and a molecule.
• Calcium carbonate ($CaCO_3$): Composed of calcium, carbon and oxygen. It is a compound. It contains calcium cations and carbonate anions, so it is an ionic compound and a molecule.

Answer:

a. $SiO_2$ - compound, molecule
b. $NaCl$ - compound, molecule, ionic compound
c. $CaCO_3$ - compound, molecule, ionic compound