model 2 - prefixes and suffixes

5. examine the prefixes in model 2. fill in the numerical value that corresponds to each prefix.
6. what suffix (ending) do all the compound names in model 2 have in common?
7. carefully examine the names of the compounds in model 2. when is a prefix not used in front of the name of an element?
8. consider the compound no.
a. which element, nitrogen or oxygen, would require a prefix in the molecule name? explain your answer.
b. name the molecule no.
9. find two compounds in model 2 that contain a subscript of \4\ in their molecular formula.
a. list the formulas and names for the two compounds.
b. what is different about the spelling of the prefix meaning \four\ in these two names?

Question

model 2 - prefixes and suffixes

5. examine the prefixes in model 2. fill in the numerical value that corresponds to each prefix.
6. what suffix (ending) do all the compound names in model 2 have in common?
7. carefully examine the names of the compounds in model 2. when is a prefix not used in front of the name of an element?
8. consider the compound no.
 a. which element, nitrogen or oxygen, would require a prefix in the molecule name? explain your answer.
 b. name the molecule no.
9. find two compounds in model 2 that contain a subscript of \4\ in their molecular formula.
 a. list the formulas and names for the two compounds.
 b. what is different about the spelling of the prefix meaning \four\ in these two names?

Accepted Answer

# 5.
## Brief Explanations:
We know that in chemistry, prefixes are used to denote the number of atoms of an element in a molecular compound.
- mono - means $1$
- di - means $2$
- tri - means $3$
- tetra - means $4$
- penta - means $5$
- hexa - means $6$
- hepta - means $7$
- octa - means $8$
- nona - means $9$
- deca - means $10$

# 6.
## Brief Explanations:
Looking at the names of the compounds in Model 2: Boron trichloride, Sulfur hexafluoride, Iodine heptafluoride, Nitrogen triiodide, Dinitrogen tetroxide, Dichlorine monoxide, Tetraphosphorus decoxide, Pentaboron nonahydride, Tribromine octoxide, Chlorine monofluoride.
We can observe that all of them end with the suffix “-ide”.

# 7.
## Brief Explanations:
When the first element in the compound has only one atom (i.e., when the subscript of the first - named element is $1$), the prefix “mono -” is not used. For example, in $ClF$ (Chlorine monofluoride), the first element $Cl$ has a sub - script of $1$ (implied, since no sub - script is written for $1$ in molecular formulas), and the prefix “mono -” is not used for $Cl$.

# 8.
## a.
## Brief Explanations:
In the naming of molecular compounds, the second element always gets a prefix (regardless of the number of its atoms). In the compound $NO$, oxygen is the second element. So, oxygen would require a prefix. Nitrogen is the first element. Since there is only one nitrogen atom (sub - script of $1$ for $N$, implied), the prefix “mono -” is not used for nitrogen.

## b.
## Brief Explanations:
Since there is $1$ nitrogen atom (no prefix for the first element when the sub - script is $1$) and $1$ oxygen atom (prefix “mono -” for the second element). The name of the molecule $NO$ is Nitrogen monoxide.

# 9.
## a.
## Brief Explanations:
Looking at the molecular formulas in Model 2:
- $N_{2}O_{4}$ is named Dinitrogen tetroxide. Here, the sub - script of $O$ is $4$.
- $P_{4}O_{10}$ is named Tetraphosphorus decoxide. Here, the sub - script of $P$ is $4$.

## b.
## Brief Explanations:
In $N_{2}O_{4}$ (Dinitrogen tetroxide), the prefix for “four” is “tetra -” (used for the second element $O$). In $P_{4}O_{10}$ (Tetraphosphorus decoxide),  the prefix for “four” is also “tetra -” (used for the first element $P$). There is no difference in the spelling of the prefix meaning “four” in these two names.

# Answer:
5. mono - $1$; di - $2$; tri - $3$; tetra - $4$; penta - $5$; hexa - $6$; hepta - $7$; octa - $8$; nona - $9$; deca - $10$
6. - ide
7. When the first element in the compound has a sub - script of $1$ (implied when no sub - script is written for the first element)
8. a. Oxygen. The second element in a molecular compound name always gets a prefix. b. Nitrogen monoxide
9. a. $N_{2}O_{4}$ - Dinitrogen tetroxide; $P_{4}O_{10}$ - Tetraphosphorus decoxide b. No difference. Both use the prefix “tetra -”

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