A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas. Which group of statements best describe all of the materials he is using in the investigation?
Answer
A
They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter.
B
They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms.
C
They are each made of matter. Some are compounds and some are elements. They all contain atoms.
D
They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.
Explanation
Water (H₂O) and carbon dioxide (CO₂) are compounds because each contains more than one type of element. Silver and oxygen gas (O₂) are elements; oxygen gas consists of molecules made from oxygen atoms. All four materials are matter and contain atoms, so choice D describes them all. Choice A is incorrect because compounds are not made of just one type of element.
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