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Chemical Formula - Class 7 PDF Download
How to write chemical formula?
Ref: https://edurev.in/question/612699/How-to-write-chemical-formula-
Chemical Formula
As already stated, a chemical formula is a symbolic expression signifying the number of atoms present in a molecular substance. We determine the type of atom by referring to its symbol, so for Hydrogen, we will use H. The number of atoms is determined by the subscript attached to the symbol. So a chemical formula of water, i.e H2O has two atoms of hydrogen and a single atom of oxygen.
Steps to write a chemical formula
Step 1: First, you have to decide the type of the bond.
If the prefixes are used, then it is a covalent bond. In case there are no prefixes, it is an ionic bond. After that is decided move to Step number 2.
Step 2: Now, write down the symbol of the polyatomic ion or the element.
Step 3: Now, if the prefix was used, you’ll have to add a subscript. You’ll also have to add a subscript in order to balance the charge.
Solved Example For You
Q. Write the chemical formulae for
- Hexane
- Sodium Chloride
Ans. C6H14 – this has 6 atoms of carbon and 14 atoms of Hydrogen and is collectively called Hexane. NaCl- also known as Sodium Chloride or common salt, this formula has a single atom of Sodium and a single atom of Chloride. Always remember that in places where there is no subscript, like in the example above, the value of atom is presumed to be 1.
FAQs on Chemical Formula - Class 7
| 1. What is a chemical formula? |  |
Ans. A chemical formula is a representation of the elements present in a compound and their respective proportions. It shows the types and number of atoms of each element in the compound. For example, the chemical formula H2O represents a water molecule, which consists of two hydrogen atoms and one oxygen atom.
| 2. How are chemical formulas written? | |
Ans. Chemical formulas are written using symbols and subscripts. The symbol represents the element, and the subscript indicates the number of atoms of that element. For example, in the chemical formula CO2, "C" represents carbon, and "O" represents oxygen. The subscript "2" indicates that there are two oxygen atoms present.
| 3. What is the significance of chemical formulas? | |
Ans. Chemical formulas are significant as they provide valuable information about the composition of a compound. They help scientists and chemists understand the elements present in a substance and their ratios. Chemical formulas also allow for the prediction of chemical reactions and the formation of new compounds.
| 4. How do you determine the chemical formula of a compound? | |
Ans. The chemical formula of a compound can be determined through various methods, including experimental analysis and knowledge of the elements' properties. Analytical techniques such as spectroscopy and mass spectrometry can help identify the elements present in a compound. Additionally, the valency of elements and their combining capacities can be used to determine the ratio of elements in the compound.
| 5. Can chemical formulas be changed or modified? | |
Ans. Chemical formulas represent the fixed composition of a compound, and therefore, they cannot be changed or modified without altering the compound's identity. However, it is possible to rearrange the elements in a compound to form different isomers or allotropes, resulting in different chemical formulas. For example, carbon can exist as diamond (C) or graphite (C), which have different structures and chemical formulas.
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Nov 15, 2024 Last updated |
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