A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas. Which group of statements best describes all of the materials he is using in the investigation?
A. They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter.
B. They are each made of matter. Some are compounds and some are elements. They all contain atoms.
C. They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms.
D. They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.
Answer (2)
The materials used by the scientist consist of both elements and compounds. They are all forms of matter and contain atoms. The correct classification is that some materials are compounds while others are elements. ;
The correct classification of the materials is that they are made of matter, some are compounds (water and carbon dioxide), while others are elements (silver and oxygen). The chosen answer is B: 'They are each made of matter. Some are compounds and some are elements. They all contain atoms.'
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