Question

directions: use the key to help you choose the correct chemical formula from the list below for each molecule. the first example has been done for you.

7.
atom
molecule
element
compound

8.
atom
molecule
element
compound

9.
atom
molecule
element
compound

10.
atom
molecule
element
compound

11.
atom
molecule
element
compound

12.
atom
molecule
element
compound

Explanation:

Problem 7

Step1: Analyze atom: Each sphere is an atom. Different patterns (striped, checkered) are different atoms? Wait, no—wait, in problem 7, there are two groups: striped - striped and checkered - checkered. So each group is a molecule.

Step2: Element: A molecule with same - type atoms (striped - striped: same type? Wait, no—wait, the key: atom is single sphere, molecule is group, element is same - atom molecules, compound is different - atom molecules. Wait, problem 7: two molecules, each with two same - patterned spheres. So each molecule is an element (same atoms), and since there are two types? Wait no, wait the first example? Wait, maybe I misread. Wait problem 7: the first molecule is two striped spheres (same), second is two checkered spheres (same). So:

• Atom: Each sphere is an atom (so for striped, each striped is an atom; checkered, each checkered is an atom). But the columns: atom (single), molecule (group), element (molecule with same atoms), compound (molecule with different atoms).

So for problem 7:

• Atom: Let's say each sphere is an atom (so striped and checkered are different atoms? No, wait, maybe the same pattern is same atom. So in molecule 1: two striped atoms (same), molecule 2: two checkered atoms (same).

So:

• Atom: Each sphere (striped or checkered) is an atom.
• Molecule: Each group (striped - striped, checkered - checkered) is a molecule.
• Element: A molecule made of same atoms (so both molecules are elements, but wait the columns: maybe for each molecule? Wait no, the problem is to classify for each molecule? Wait the directions say "for each molecule". Wait problem 7 has two molecules? Wait the image: problem 7 has two molecules: one with two striped spheres, one with two checkered spheres.

Wait, maybe the columns are: for the given diagram (each problem is a diagram), classify atom (single sphere), molecule (group), element (molecule with same atoms), compound (molecule with different atoms).
Wait problem 7: diagram has two molecules, each with two same - type atoms (striped - striped, checkered - checkered). So:

• Atom: Each sphere (striped or checkered) is an atom. So if we consider the diagram, maybe the first molecule: two atoms (striped), second: two atoms (checkered).
• Molecule: Each group (two striped, two checkered) is a molecule.
• Element: A molecule with same atoms (so both molecules are elements, but wait the columns: maybe for the entire diagram? Wait no, the directions say "for each molecule". Wait maybe I need to re - evaluate. Let's take problem 8: single sphere (atom), so atom: yes, molecule: no (single), element: yes (single atom is element), compound: no.

Problem 7: two molecules, each with two same atoms. So:

• Atom: Each sphere is an atom (so in the first molecule, two atoms; second, two atoms).
• Molecule: Each group is a molecule (so two molecules).
• Element: Each molecule has same atoms (so element: yes for each molecule? But the columns are atom, molecule, element, compound. Maybe for the diagram:

Atom: How many single atoms? None, all are in molecules.
Molecule: Two molecules (each group).
Element: Each molecule is made of same atoms (so element: yes, because same - atom molecules).
Compound: No, because no different - atom molecules.
Wait, maybe the key is:

• Atom: single sphere (not in a molecule)
• Molecule: two or more spheres bonded (group)
• Element: molecule with same - type spheres (same atom)
• Compound: molecule with different - type spheres (different atoms)

So problem 7:

• Atom: 0 (all in molecules)
• Molecule: 2 (two groups)
• Element: 2 (each group has same sp…

Answer:

Step1: Analyze atom: Each sphere is an atom. Different patterns (striped, checkered) are different atoms? Wait, no—wait, in problem 7, there are two groups: striped - striped and checkered - checkered. So each group is a molecule.

Step2: Element: A molecule with same - type atoms (striped - striped: same type? Wait, no—wait, the key: atom is single sphere, molecule is group, element is same - atom molecules, compound is different - atom molecules. Wait, problem 7: two molecules, each with two same - patterned spheres. So each molecule is an element (same atoms), and since there are two types? Wait no, wait the first example? Wait, maybe I misread. Wait problem 7: the first molecule is two striped spheres (same), second is two checkered spheres (same). So:

• Atom: Each sphere is an atom (so for striped, each striped is an atom; checkered, each checkered is an atom). But the columns: atom (single), molecule (group), element (molecule with same atoms), compound (molecule with different atoms).

So for problem 7:

• Atom: Let's say each sphere is an atom (so striped and checkered are different atoms? No, wait, maybe the same pattern is same atom. So in molecule 1: two striped atoms (same), molecule 2: two checkered atoms (same).

So:

• Atom: Each sphere (striped or checkered) is an atom.
• Molecule: Each group (striped - striped, checkered - checkered) is a molecule.
• Element: A molecule made of same atoms (so both molecules are elements, but wait the columns: maybe for each molecule? Wait no, the problem is to classify for each molecule? Wait the directions say "for each molecule". Wait problem 7 has two molecules? Wait the image: problem 7 has two molecules: one with two striped spheres, one with two checkered spheres.

Wait, maybe the columns are: for the given diagram (each problem is a diagram), classify atom (single sphere), molecule (group), element (molecule with same atoms), compound (molecule with different atoms).
Wait problem 7: diagram has two molecules, each with two same - type atoms (striped - striped, checkered - checkered). So:

• Atom: Each sphere (striped or checkered) is an atom. So if we consider the diagram, maybe the first molecule: two atoms (striped), second: two atoms (checkered).
• Molecule: Each group (two striped, two checkered) is a molecule.
• Element: A molecule with same atoms (so both molecules are elements, but wait the columns: maybe for the entire diagram? Wait no, the directions say "for each molecule". Wait maybe I need to re - evaluate. Let's take problem 8: single sphere (atom), so atom: yes, molecule: no (single), element: yes (single atom is element), compound: no.

Problem 7: two molecules, each with two same atoms. So:

• Atom: Each sphere is an atom (so in the first molecule, two atoms; second, two atoms).
• Molecule: Each group is a molecule (so two molecules).
• Element: Each molecule has same atoms (so element: yes for each molecule? But the columns are atom, molecule, element, compound. Maybe for the diagram:

Atom: How many single atoms? None, all are in molecules.
Molecule: Two molecules (each group).
Element: Each molecule is made of same atoms (so element: yes, because same - atom molecules).
Compound: No, because no different - atom molecules.
Wait, maybe the key is:

• Atom: single sphere (not in a molecule)
• Molecule: two or more spheres bonded (group)
• Element: molecule with same - type spheres (same atom)
• Compound: molecule with different - type spheres (different atoms)

So problem 7:

• Atom: 0 (all in molecules)
• Molecule: 2 (two groups)
• Element: 2 (each group has same spheres)
• Compound: 0

But the way to fill is: for each row (atom, molecule, element, compound), put a check or mark? Wait the original problem has lines, maybe to write yes/no or count? Wait maybe the first example (not shown) was done, but let's proceed with problem 7:

Step1: Atom: Are there single atoms? No, all spheres are in pairs. So atom: no (or 0).

Step2: Molecule: Are there molecules? Yes, two (the two pairs). So molecule: yes (2).

Step3: Element: Are the molecules made of same atoms? Yes, each pair has same - patterned spheres. So element: yes (2).

Step4: Compound: Are there molecules with different atoms? No. So compound: no (0).

But maybe the answer is to mark for each category:

Atom: \_ (no single atoms)
Molecule: \_ (yes, two molecules)
Element: \_ (yes, both are elements)
Compound: \_ (no)

But maybe the problem is to classify the substance. Wait, maybe each problem is a substance:

Problem 7: two types of molecules, each is an element (diatomic elements), so the substance is a mixture of two elements. But the columns are atom, molecule, element, compound for the diagram.

Alternatively, let's do problem 8:

Problem 8: single sphere (atom). So:

• Atom: yes (1)
• Molecule: no (single)
• Element: yes (single atom is an element)
• Compound: no

Problem 9: diagram has three molecules? Wait, one with striped and white, one with two black, one with two black? Wait no, the image: problem 9 has a molecule with striped and white (different atoms), and two molecules with two black atoms? Wait, no, let's see:

Problem 9: first molecule: striped, white, striped (three atoms, two striped, one white? No, maybe two striped and one white? Wait, no, the diagram: one molecule with three spheres (striped, white, striped), and two molecules with two black spheres? Wait, no, maybe:

Problem 9: molecule 1: three atoms (striped, white, striped) – different atoms (striped and white), so compound. Molecule 2: two black atoms – element. Molecule 3: two black atoms – element.

But this is getting complicated. Maybe the key is:

• Atom: single sphere (not bonded)
• Molecule: two or more bonded spheres
• Element: molecule with same - type spheres
• Compound: molecule with different - type spheres

Let's solve problem 7:

Diagram: two molecules, each with two same - type spheres (striped - striped, checkered - checkered).

• Atom: 0 (no single spheres)
• Molecule: 2 (two bonded groups)
• Element: 2 (each group has same spheres)
• Compound: 0 (no groups with different spheres)

Problem 8:

Diagram: single sphere (checkered).

• Atom: 1 (single sphere)
• Molecule: 0 (no bonded group)
• Element: 1 (single atom is element)
• Compound: 0 (no bonded group with different atoms)

Problem 9:

Diagram: one molecule with striped and white (different) spheres, and two molecules with two black spheres (same).

• Atom: 0
• Molecule: 3 (one compound - molecule, two element - molecules)
• Element: 2 (the two black - black molecules)
• Compound: 1 (the striped - white - striped molecule)

Problem 10:

Diagram: single white sphere and one black - black molecule.

• Atom: 1 (white sphere)
• Molecule: 1 (black - black)
• Element: 1 (black - black molecule, and white atom is element)
• Compound: 0

Problem 11:

Diagram: two striped - striped molecules, two black - black - black? Wait, no, the diagram: two striped - striped (diatomic), two molecules with three black spheres? Wait, no, maybe two striped - striped (element), two molecules with three black spheres (but no, the diagram: maybe two striped - striped (element) and two molecules with three black spheres? Wait, no, the image: problem 11 has two striped - striped molecules, two molecules with three black spheres? No, maybe two striped - striped (element) and two molecules with three black spheres (but that's not standard). Wait, maybe two striped - striped (element) and two molecules with three black spheres (but maybe the black molecules are compounds? No, three black spheres – same atom, so element (triatomic). So:

• Atom: 0
• Molecule: 4 (two striped - striped, two black - black - black)
• Element: 4 (all molecules have same atoms)
• Compound: 0

Problem 12:

Diagram: two molecules, one with three striped spheres, one with three striped spheres? Wait, no, one with three striped, one with three striped? No, maybe two molecules, each with three striped spheres (triatomic element). So:

• Atom: 0
• Molecule: 2 (two triatomic groups)
• Element: 2 (same atoms)
• Compound: 0

Problem 7 Answer:

Atom: \(\boldsymbol{0}\)
Molecule: \(\boldsymbol{2}\)
Element: \(\boldsymbol{2}\)
Compound: \(\boldsymbol{0}\)

Problem 8 Answer:

Atom: \(\boldsymbol{1}\)
Molecule: \(\boldsymbol{0}\)
Element: \(\boldsymbol{1}\)
Compound: \(\boldsymbol{0}\)

Problem 9 Answer:

Atom: \(\boldsymbol{0}\)
Molecule: \(\boldsymbol{3}\)
Element: \(\boldsymbol{2}\)
Compound: \(\boldsymbol{1}\)

Problem 10 Answer:

Atom: \(\boldsymbol{1}\)
Molecule: \(\boldsymbol{1}\)
Element: \(\boldsymbol{2}\) (1 atom + 1 molecule, both element)
Compound: \(\boldsymbol{0}\)

Problem 11 Answer:

Atom: \(\boldsymbol{0}\)
Molecule: \(\boldsymbol{4}\)
Element: \(\boldsymbol{4}\)
Compound: \(\boldsymbol{0}\)

Problem 12 Answer:

Atom: \(\boldsymbol{0}\)
Molecule: \(\boldsymbol{2}\)
Element: \(\boldsymbol{2}\)
Compound: \(\boldsymbol{0}\)

(Note: The answers are based on the interpretation of "atom" as single unbonded sphere, "molecule" as bonded group, "element" as molecule with same - type spheres, and "compound" as molecule with different - type spheres. The counts are for the number of each category in the diagram.)