Naming Covalent Molecular Compounds

Tyler DeWitt
15 Apr 201510:45
EducationalLearning
32 Likes 10 Comments

TLDRThis educational video script explains the process of naming covalent or molecular compounds, which are composed of two non-metal elements. It distinguishes these from ionic compounds, which include a metal and a non-metal. The script outlines steps for naming, emphasizing starting with the element name, using the correct prefixes, and avoiding awkward pronunciations by modifying certain prefixes. Examples illustrate the naming process, ensuring clarity and understanding.

Takeaways
  • 🔬 Compounds made of two non-metals are called covalent or molecular compounds, held together by covalent bonds in molecules.
  • 📚 The naming of covalent compounds differs from that of ionic compounds, which consist of a metal and a non-metal and have their own set of naming conventions.
  • 📝 To name a covalent compound, start with the element name for the first non-metal in the chemical formula.
  • 🔡 For the second non-metal, use the 'ide' name, which is typically the same as the name for the negative ion of that element.
  • 🔢 Use prefixes to indicate the number of atoms of each element in the compound, such as 'di-' for two, 'tetra-' for four, 'penta-' for five, etc.
  • 🚫 Do not use the prefix 'mono-' for the first element if there is only one atom of it in the compound.
  • 🔁 When the prefixes 'di-' or 'tri-' are used with the second element, and it results in an awkward pronunciation (like 'heptooxide'), change it to 'oxide' to simplify the name.
  • 📐 For compounds with more complex formulas, additional steps may be added to avoid awkward names, such as changing 'monooxide' to 'monoxide'.
  • 🌐 The process of naming covalent compounds involves memorizing prefixes and applying specific rules to avoid pronunciation issues.
  • 📑 Understanding the periodic table is crucial for identifying elements and their corresponding names and 'ide' names in covalent compounds.
  • 👨‍🏫 The script provides a step-by-step guide to naming covalent compounds, emphasizing the importance of following naming conventions to ensure clarity and consistency.
Q & A

  • What are covalent or molecular compounds?

    -Covalent or molecular compounds are formed by two non-metal elements that are held together by covalent bonds in groups called molecules.

  • How do covalent compounds differ from ionic compounds?

    -Covalent compounds consist of two non-metals and are held together by covalent bonds, whereas ionic compounds are made of a metal and a non-metal and are held together by ionic bonds.

  • What is the first step in naming a covalent compound?

    -The first step in naming a covalent compound is to start with the element name of the first element in the chemical formula.

  • What is the second element in a covalent compound named as?

    -The second element in a covalent compound is named using its anionic name, which ends in '-ide'.

  • Why is the prefix 'mono' not used for the first element in a covalent compound?

    -The prefix 'mono' is not used for the first element in a covalent compound to avoid awkward pronunciations, even if there is only one atom of the first element.

  • What is the purpose of prefixes in naming covalent compounds?

    -Prefixes are used in naming covalent compounds to indicate the number of atoms of each element present in the compound.

  • How is the compound N2O3 named according to the script?

    -The compound N2O3 is named 'dinitrogen trioxide', using the prefixes 'di-' for two nitrogen atoms and 'tri-' for three oxygen atoms.

  • What rule is applied to simplify the pronunciation of compound names with 'AO' or 'OO'?

    -To simplify pronunciation, the 'A' in 'AO' or 'OO' is dropped, turning 'monooxide' into 'oxide', for example.

  • What is the name of the compound P4S10 according to the script?

    -The compound P4S10 is named 'tetra phosphorus decasulfide', using the prefixes 'tetra-' for four phosphorus atoms and 'deca-' for ten sulfur atoms.

  • How is the compound PCl5 named, and what rule is applied?

    -The compound PCl5 is named 'phosphorus pentachloride', applying the rule of not using 'mono' for the first element, and using the prefix 'penta-' for five chlorine atoms.

  • What is the final step in naming covalent compounds to avoid awkward pronunciations?

    -The final step is to eliminate the 'A' in prefixes like 'mono-', 'tetra-', etc., when followed by an 'O' to simplify pronunciation, resulting in names like 'oxide' instead of 'monooxide'.

Outlines
00:00
🧪 Naming Covalent Compounds

This paragraph introduces the process of naming covalent or molecular compounds, which are composed of two non-metal elements from the right side of the periodic table. It differentiates these from ionic compounds, which contain a metal and a non-metal. The video aims to teach the naming of covalent compounds, starting with the chemical formula N2O3 as an example. The naming process involves starting with the element name, using the -ide suffix for the second element, and applying prefixes to indicate the number of atoms of each element. The paragraph also emphasizes that the first element in the formula does not take the 'mono' prefix, even if there is only one atom of it.

05:00
📚 Rules for Naming Covalent Compounds

This paragraph continues the discussion on naming covalent compounds, providing additional rules and examples. It explains that when there is only one of the first element, the 'mono' prefix is omitted. The paragraph further illustrates this with examples like carbon tetrafluoride and phosphorus pentachloride. It also introduces a rule to simplify pronunciation by changing 'AO' or 'OO' to 'O' in compound names, as demonstrated with chlorine heptoxide and tetraphosphorus hexoxide. This step is crucial for avoiding awkward pronunciations and ensuring that the compound names are easy to articulate.

10:01
📘 Summary of Covalent Compound Naming

The final paragraph summarizes the process of naming covalent compounds with two non-metals. It reiterates the importance of not using the 'mono' prefix for the first element when there is only one atom present. It also highlights the pronunciation rule of changing 'AO' or 'OO' to 'O' to prevent awkward names. The paragraph concludes with a reminder of the steps involved in naming these compounds and emphasizes the need to avoid awkward pronunciations, ensuring that the names are both accurate and easy to say.

Mindmap
Keywords
💡Non-metals
Non-metals are elements found to the right of the staircase on the periodic table, characterized by their tendency to gain electrons to form negative ions. In the context of the video, non-metals are key in forming covalent or molecular compounds when combined with another non-metal, as they share electrons through covalent bonds rather than transferring them as in ionic compounds.
💡Covalent Compounds
Covalent compounds are formed when two or more non-metal elements are bonded together by sharing electrons, creating covalent bonds. The video explains that these compounds are named differently from ionic compounds, with a focus on the prefixes and suffixes that indicate the number of atoms of each element involved.
💡Molecular Compounds
Molecular compounds are a type of covalent compound where the elements are held together in discrete molecules. The video script emphasizes that the naming convention for molecular compounds involves using element names and prefixes to denote the number of atoms, as opposed to the simpler nomenclature of ionic compounds.
💡Ionic Compounds
Ionic compounds consist of a metal and a non-metal element, held together by ionic bonds due to the transfer of electrons from the metal to the non-metal. The script contrasts ionic compounds with covalent compounds, highlighting that the naming process for ionic compounds is different and that there are other videos dedicated to explaining their nomenclature.
💡Chemical Formula
A chemical formula represents the composition of a substance, using element symbols and subscripts to indicate the number of atoms of each element present. In the video, chemical formulas like N2O3 are used to demonstrate the naming process for covalent compounds, showing the sequence of elements and their quantities.
💡Prefixes
Prefixes in chemistry are used to denote the quantity of atoms of a particular element in a compound. The script provides a list of prefixes and illustrates their use in naming covalent compounds, such as 'di-' for two atoms and 'tetra-' for four atoms, to indicate the number of atoms of each element.
💡Element Name
The element name refers to the standard name of a chemical element. In the context of naming covalent compounds, the script explains that the name of the first element in the chemical formula is used directly in the compound's name, such as 'nitrogen' in N2O3.
💡Anion Name
An anion name is the term used for the negatively charged ion of an element, which typically ends in '-ide'. The video script uses 'oxide' as an example of an anion name, derived from oxygen, to demonstrate how the second element in a covalent compound is named.
💡Mono
The prefix 'mono-' indicates a single atom of an element. However, the video emphasizes a special rule in chemical nomenclature where 'mono-' is not used for the first element in a covalent compound if there is only one atom of that element, as in the compound carbon tetrafluoride.
💡Pronunciation
Pronunciation in chemistry refers to the correct way to say the names of elements and compounds. The script discusses how certain prefixes and suffixes can lead to awkward pronunciations, such as 'heptoxide', and introduces rules to simplify them, like changing 'monooxide' to 'monoxide' for ease of pronunciation.
💡Oxide
Oxide is the anion name for oxygen in compounds. The script uses 'oxide' to illustrate the naming of covalent compounds involving oxygen and the special rule for simplifying pronunciation by removing the 'a' when it precedes 'o', as in changing 'tetraoxode' to 'tetraoxide'.
Highlights

Covalent or molecular compounds are formed by two non-metals held together by covalent bonds in molecules.

The naming of covalent compounds differs from ionic compounds, which consist of a metal and a non-metal.

To name a covalent compound, start with the element name of the first non-metal in the chemical formula.

For the second non-metal, use the anide name, which is the negative ion version of the element name.

Utilize prefixes to indicate the number of atoms of each element in the compound.

Do not use the prefix 'mono' for the first element when there is only one atom of it.

For complex formulas, avoid awkward pronunciation by converting 'AO' or 'OO' to 'O' in the compound name.

The video provides a step-by-step guide on naming covalent compounds with examples like N2O3 and P4S10.

The name 'dinitrogen trioxide' is given to the compound N2O3 following the naming rules.

Tetra phosphorus decasulfide is the correct name for the compound P4S10, illustrating the use of prefixes.

Carbon tetrafluoride is an example of not using 'mono' for the first element even with a single atom.

Phosphorus pentachloride is named without 'mono' for phosphorus, despite having only one atom.

Chlorine heptoxide is the simplified name for Cl2O7, avoiding the awkward 'heptooxide'.

Tetraphosphorus hexoxide is derived from P406 by simplifying the name and using prefixes correctly.

Carbon monoxide is a familiar example of a covalent compound named according to the established rules.

The video clarifies common misconceptions, such as the incorrect use of 'mono' for the first element.

A comprehensive review of the naming process is provided, ensuring understanding of the rules and exceptions.

Transcripts

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Chemical NomenclatureCovalent CompoundsMolecular BondsPeriodic TableElement NamesNaming RulesPrefixesChemistry EducationIonic vs CovalentCompound Formulas