Class 7 Exam > Class 7 Videos > Class 7 Oxford Science: Chapter Notes, Worksheets & Tests > Writing Chemical Formulae
Writing Chemical Formulae Video Lecture | Class 7 Oxford Science: Chapter Notes, Worksheets & Tests
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FAQs on Writing Chemical Formulae Video Lecture - Class 7 Oxford Science: Chapter Notes, Worksheets & Tests
| 1. What are chemical formulae and why are they important in chemistry? |  |
Ans.Chemical formulae are symbolic representations of chemical compounds that show the types and numbers of atoms present in a substance. They are important because they provide a clear way to communicate the composition of compounds, helping scientists and students understand chemical reactions and the properties of substances.
| 2. How do you write the chemical formula for a compound? | |
Ans.To write a chemical formula, you need to know the symbols of the elements involved and the ratio of the atoms of each element in the compound. For example, in water (H₂O), the formula indicates there are two hydrogen (H) atoms and one oxygen (O) atom. You write the symbol for the element followed by a subscript that indicates the number of atoms.
| 3. What is the difference between a molecular formula and a empirical formula? | |
Ans.A molecular formula shows the actual number of atoms of each element in a molecule, while an empirical formula shows the simplest whole-number ratio of the elements in the compound. For example, the molecular formula of glucose is C₆H₁₂O₆, while its empirical formula is CH₂O.
| 4. How do you determine the chemical formula of a compound from its name? | |
Ans.To determine the chemical formula from a compound's name, you need to identify the elements involved and their valencies. For instance, in sodium chloride (table salt), sodium (Na) has a valency of +1 and chlorine (Cl) has a valency of -1. Thus, the formula is NaCl, combining one sodium ion with one chloride ion.
| 5. What are some common examples of chemical formulae for everyday substances? | |
Ans.Common examples of chemical formulae include water (H₂O), carbon dioxide (CO₂), and table salt (NaCl). These formulae represent compounds that are frequently encountered in daily life, illustrating the basic principles of chemistry in action.
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Dec 23, 2024 Last updated |
Video Description: Writing Chemical Formulae for Class 7 2024 is part of Class 7 Oxford Science: Chapter Notes, Worksheets & Tests preparation.
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