Question

25,617 Learners found this answer helpful

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?
first box
they are each compounds.
each of the compounds is
made of atoms. all of the
atoms are made of matter.

second box
they are all elements.
some contain molecules of
the same type of atom.
some contain different
types of atoms.

third box
they are each made of
matter. some are
compounds and some are
elements. they all contain
atoms.

fourth box
they are each made of
matter. some are
compounds made of one
type of element. some are
pure atoms.

Explanation:

To solve this, we analyze each material (water, silver, carbon dioxide, oxygen gas) and the statements:

Step 1: Identify the nature of each material

• Water ($\ce{H_2O}$): Compound (2 elements, $\ce{H}$ and $\ce{O}$), made of molecules, contains atoms.
• Silver ($\ce{Ag}$): Element (pure substance, single type of atom), made of atoms.
• Carbon dioxide ($\ce{CO_2}$): Compound (2 elements, $\ce{C}$ and $\ce{O}$), made of molecules, contains atoms.
• Oxygen gas ($\ce{O_2}$): Element (diatomic molecule, single type of atom, $\ce{O}$), made of molecules (or atoms in a diatomic form).

Step 2: Analyze each statement group

1. First group: Claims "each are compounds" – but silver and oxygen are elements, so incorrect.
2. Second group: Claims "each are made of matter" (true, all are matter) but "some are compounds and some are elements" (water and $\ce{CO_2}$ are compounds; silver and $\ce{O_2}$ are elements) and "all contain atoms" (true, as compounds/elements are made of atoms). However, let’s check others.
3. Third group: Claims "all are elements" – but water and $\ce{CO_2}$ are compounds, so incorrect.
4. Fourth group: Claims "each made of matter" (true), "some are compounds (water, $\ce{CO_2}$) and some are elements (silver, $\ce{O_2}$)", "some compounds made of one type of element" – incorrect (compounds need ≥2 elements).

Wait, re - evaluating the second group:

• "They are each made of matter" (all materials are matter: water, silver, $\ce{CO_2}$, $\ce{O_2}$ are matter).
• "Some are compounds (water, $\ce{CO_2}$) and some are elements (silver, $\ce{O_2}$)".
• "They all contain atoms" (compounds have atoms in molecules; elements have atoms).

Other groups have errors:

• First: False (not all compounds).
• Third: False (not all elements).
• Fourth: False (compounds need ≥2 elements, so "some compounds made of one type of element" is wrong).

So the correct group is the second one (the box with: "They are each made of matter. Some are compounds and some are elements. They all contain atoms.").

Answer:

The group of statements: "They are each made of matter. Some are compounds and some are elements. They all contain atoms." (the second box from the top - left, or the one with that text).