Grade 6 Science Worksheets
A molecular compound is a type of chemical compound that is made up of individual molecules. These molecules are composed of two or more atoms that are held together by covalent bonds.
In this article, you will learn:
- Molecular Compounds
- Binary Molecular Compound Names
Molecular Compounds - Grade 6 Science Worksheet PDF
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Molecular compounds can be composed of elements of the same or different types. For example, water (H2O) is a molecular compound made up of two hydrogen atoms and one oxygen atom. In comparison, Oxygen (O2) is a molecular compound made up two atom of same element Oxygen.
Molecular compounds are usually gases, liquids, or low-melting solids at room temperature. They are usually non-conductive in their solid and liquid states and have low boiling and melting points, this is because the forces holding the atoms together in the molecule are relatively weak to ionic compound.
It is important to note that not all compounds that are composed of molecules are molecular compounds. Some compounds that are composed of ions are ionic compounds, which are held together by ionic bonds, instead of covalent bonds.
Some examples of molecular compounds include:
It’s worth mentioning that some of these examples can have different physical state, like water and ethanol are liquids, while CO2 and N2 are gases, and Aspirin is a solid.
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Binary Molecular Compound Names
Binary molecular compounds are chemical compounds composed of two different elements. The names of binary molecular compounds are formed by combining the name of the first element with the name of the second element, with the suffix -ide.
For example, the binary molecular compound made up of carbon and chlorine is named carbon chloride. The chemical formula for carbon chloride is CCl4.
In some cases, the name of the first element is modified to indicate the number of atoms present. For example, the binary molecular compound made up of one carbon atom and two hydrogen atoms is named methane, and the chemical formula is CH4.
Another example is when the first element is a transition metal, the name of the compound is formed by using the metal name and adding the name of the second element with the suffix -ate or -ite, depending on the charge of the ion. For example FeCl3 is called Iron(III) chloride, while FeCl2 is called Iron(II) chloride.
It is important to note that there are some exceptions to these naming conventions, and you should always check the chemical formula and the context of the compound before naming it.
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What is the difference between molecular compounds and ionic compounds?
Molecular compounds are held together by covalent bonds, which are bonds formed by the sharing of electrons between atoms, while ionic compounds are held together by ionic bonds, which are bonds formed by the transfer of electrons between atoms.
Eg- molecular compoun – Ethanol (C2H5OH), Ionic compound (HCl)
Are molecular compounds always gases?
No, molecular compounds can exist in different physical states depending on the conditions. They can be gases, liquids or solids at room temperature.
Are molecular compounds always non-conductive?
Molecular compounds are typically non-conductive in their solid and liquid states because the electrons are shared in covalent bonds and are not free to move. However, some molecular compounds can conduct electricity in the gaseous state or if they are dissolved in a polar solvent.
Can molecular compounds be composed of the same element?
Yes, molecular compounds can be composed of the same element. An example of this is diatomic molecules, such as H2 and N2, which are made up of two atoms of the same element.
How can you tell if a compound is a molecular compound?
A compound is a molecular compound if it is composed of individual molecules and is held together by covalent bonds. The chemical formula and the name of the compound can provide clues about the compound nature.
How does the chemical formula of a molecular compound relate to its name?
The chemical formula of a molecular compound indicates the number of atoms of each element present in the compound and the name of the compound is based on the chemical formula and the element’s name.
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