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Elements, Compounds, Symbols, And Formulae Video Lecture | Chemistry Class 6 ICSE
FAQs on Elements, Compounds, Symbols, And Formulae Video Lecture - Chemistry Class 6 ICSE
| 1. What are elements and compounds? |  |
Ans. Elements are pure substances that consist of only one type of atom. They cannot be broken down into simpler substances by chemical means. Compounds, on the other hand, are substances formed when two or more different elements chemically bond together in fixed proportions. For example, water (H₂O) is a compound made of hydrogen and oxygen.
| 2. How are chemical symbols used to represent elements? | |
Ans. Chemical symbols are one or two-letter abbreviations used to represent elements. The first letter of the symbol is always capitalized, and if there is a second letter, it is lowercase. For instance, 'H' stands for hydrogen, and 'O' stands for oxygen. These symbols are standardized and used globally in chemistry.
| 3. What is the importance of chemical formulae? | |
Ans. Chemical formulae are important because they provide a way to represent the composition of a compound. They show the types and numbers of atoms present in the compound. For example, the formula C₆H₁₂O₆ represents glucose, indicating it is made up of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
| 4. Can you give examples of common elements and their symbols? | |
Ans. Yes! Some common elements and their symbols include:
- Oxygen (O)
- Carbon (C)
- Hydrogen (H)
- Nitrogen (N)
- Iron (Fe)
These symbols are used in various chemical equations and reactions.
| 5. How do you differentiate between a mixture and a compound? | |
Ans. A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means. For example, a salad is a mixture of different vegetables. A compound, however, is formed when substances chemically combine, resulting in a new substance with properties different from the original elements. For instance, sodium chloride (table salt) is a compound formed from sodium and chlorine.
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