Grade 9 Exam > Grade 9 Videos > Chemistry for Grade 9 > Writing Chemical Formulae
Writing Chemical Formulae Video Lecture | Chemistry for Grade 9
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FAQs on Writing Chemical Formulae Video Lecture - Chemistry for Grade 9
| 1. What are chemical formulae? |  |
Ans. Chemical formulae are a way to represent the elements and their ratios in a compound. They use symbols for each element and subscripts to indicate the number of atoms of each element present. For example, H2O represents water, with two hydrogen atoms and one oxygen atom.
| 2. How are chemical formulae written? | |
Ans. Chemical formulae are typically written by using the symbol of the element followed by a subscript to indicate the number of atoms. If there is more than one atom of an element, the subscript is written after the element's symbol. For example, CO2 represents carbon dioxide, with one carbon atom and two oxygen atoms.
| 3. Can chemical formulae be used to determine the properties of a compound? | |
Ans. While chemical formulae provide information about the elements and their ratios in a compound, they do not directly provide information about the properties of the compound. The properties of a compound depend on various factors such as the arrangement of atoms, bonding, and intermolecular forces.
| 4. How do you write the chemical formula for ionic compounds? | |
Ans. The chemical formula for ionic compounds is determined by balancing the charges of the ions involved. The subscript of each ion in the formula is determined by the ratio of the charges. For example, the chemical formula for sodium chloride (NaCl) is written as such because sodium has a +1 charge and chloride has a -1 charge.
| 5. Can chemical formulae be used to determine the molecular mass of a compound? | |
Ans. Yes, chemical formulae can be used to determine the molecular mass of a compound. Each element in the compound is assigned its atomic mass, and the molecular mass is calculated by adding up the atomic masses of all the elements in the formula. The molecular mass is often represented in atomic mass units (amu).
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Nov 24, 2024 Last updated |
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