collection 1: create each molecule and complete the chart
chemical formula | name of molecule | # of elements | # of atoms | sketch
| | | | ball & stick model
h₂o | water | 2( oxygen and| 3( 2 hydrogens and 1| image of h₂o model
| | hydrogen | oxygen) |
o₂ | | | |
co₂ | | | |
ch₄ | | | |
h₂o₂ | | | |

Question

Accepted Answer

### For $ \boldsymbol{O_2} $:
# Explanation:
## Step1: Name the molecule
$ O_2 $ is a diatomic molecule of oxygen, so its name is Oxygen (or Diatomic Oxygen).
## Step2: Count number of elements
The chemical formula $ O_2 $ contains only the element oxygen, so the number of elements is 1 (just oxygen).
## Step3: Count number of atoms
In $ O_2 $, the subscript 2 indicates there are 2 oxygen atoms, so the number of atoms is 2 (both oxygen).
## Step4: Sketch the Ball & Stick model
The Ball & Stick model for $ O_2 $ would have two red (representing oxygen) balls connected by a stick, indicating a double bond (or a single bond in the case of the diatomic oxygen molecule's simple representation) between the two oxygen atoms.

### For $ \boldsymbol{CO_2} $:
# Explanation:
## Step1: Name the molecule
$ CO_2 $ is carbon dioxide.
## Step2: Count number of elements
The formula $ CO_2 $ contains carbon (C) and oxygen (O), so the number of elements is 2 (carbon and oxygen).
## Step3: Count number of atoms
There is 1 carbon atom and 2 oxygen atoms (from the subscript 2 in $ O_2 $). So total atoms $ = 1 + 2 = 3 $.
## Step4: Sketch the Ball & Stick model
The Ball & Stick model for $ CO_2 $ would have a black (representing carbon) ball in the center, with two red (representing oxygen) balls connected to it by sticks, in a linear arrangement (since $ CO_2 $ is a linear molecule).

### For $ \boldsymbol{CH_4} $:
# Explanation:
## Step1: Name the molecule
$ CH_4 $ is methane.
## Step2: Count number of elements
The formula $ CH_4 $ contains carbon (C) and hydrogen (H), so the number of elements is 2 (carbon and hydrogen).
## Step3: Count number of atoms
There is 1 carbon atom and 4 hydrogen atoms (from the subscript 4 in $ H_4 $). So total atoms $ = 1 + 4 = 5 $.
## Step4: Sketch the Ball & Stick model
The Ball & Stick model for $ CH_4 $ (methane) is a tetrahedral arrangement. A black (carbon) ball in the center, with four light blue (hydrogen) balls connected to it by sticks, each at an angle of approximately $ 109.5^\circ $ from each other.

### For $ \boldsymbol{H_2O_2} $:
# Explanation:
## Step1: Name the molecule
$ H_2O_2 $ is hydrogen peroxide.
## Step2: Count number of elements
The formula $ H_2O_2 $ contains hydrogen (H) and oxygen (O), so the number of elements is 2 (hydrogen and oxygen).
## Step3: Count number of atoms
There are 2 hydrogen atoms and 2 oxygen atoms. So total atoms $ = 2 + 2 = 4 $.
## Step4: Sketch the Ball & Stick model
The Ball & Stick model for $ H_2O_2 $ has a structure where two oxygen atoms are connected by a single bond, and each oxygen atom is connected to a hydrogen atom. So we can represent it as two red (oxygen) balls connected by a stick, with each red ball also connected to a light blue (hydrogen) ball by a stick. The overall structure is like $ H - O - O - H $ in a slightly bent arrangement (due to the lone pairs on oxygen, but for a simple sketch, we can show the single bonds between O - O and O - H).

### Filling the table:

| Chemical Formula | Name of Molecule | # of elements | # of atoms | Sketch (Ball & Stick model) |
| --- | --- | --- | --- | --- |
| $ H_2O $ | Water | 2 (oxygen and hydrogen) | 3 (2 hydrogens and 1 oxygen) | Two light blue (H) balls connected to one red (O) ball |
| $ O_2 $ | Oxygen (Diatomic Oxygen) | 1 (oxygen) | 2 (2 oxygens) | Two red (O) balls connected by a stick |
| $ CO_2 $ | Carbon Dioxide | 2 (carbon and oxygen) | 3 (1 carbon and 2 oxygens) | One black (C) ball connected to two red (O) balls (linear) |
| $ CH_4 $ | Methane | 2 (carbon and hydrogen) | 5 (1 carbon and 4 hydrogens) | One black (C) ball connected to four light blue (H) balls (tetrahedral) |
| $ H_2O_2 $ | Hydrogen Peroxide | 2 (hydrogen and oxygen) | 4 (2 hydrogens and 2 oxygens) | Two red (O) balls connected by a stick, each red ball connected to a light blue (H) ball |

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QUESTION IMAGE

Question

Explanation:

For \( \boldsymbol{O_2} \):

Step1: Name the molecule

Step2: Count number of elements

Step3: Count number of atoms

Step4: Sketch the Ball & Stick model

For \( \boldsymbol{CO_2} \):

Step1: Name the molecule

Step2: Count number of elements

Step3: Count number of atoms

Step4: Sketch the Ball & Stick model

For \( \boldsymbol{CH_4} \):

Step1: Name the molecule

Step2: Count number of elements

Step3: Count number of atoms

Step4: Sketch the Ball & Stick model

For \( \boldsymbol{H_2O_2} \):

Answer:

Step1: Name the molecule

Step2: Count number of elements

Step3: Count number of atoms

Step4: Sketch the Ball & Stick model

Filling the table:

Chemical Formula	Name of Molecule	# of elements	# of atoms	Sketch (Ball & Stick model)
\( O_2 \)	Oxygen (Diatomic Oxygen)	1 (oxygen)	2 (2 oxygens)	Two red (O) balls connected by a stick
\( CO_2 \)	Carbon Dioxide	2 (carbon and oxygen)	3 (1 carbon and 2 oxygens)	One black (C) ball connected to two red (O) balls (linear)
\( CH_4 \)	Methane	2 (carbon and hydrogen)	5 (1 carbon and 4 hydrogens)	One black (C) ball connected to four light blue (H) balls (tetrahedral)
\( H_2O_2 \)	Hydrogen Peroxide	2 (hydrogen and oxygen)	4 (2 hydrogens and 2 oxygens)	Two red (O) balls connected by a stick, each red ball connected to a light blue (H) ball