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Atoms and Molecules Video Lecture | Science Class 9

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FAQs on Atoms and Molecules Video Lecture - Science Class 9

1. What are atoms and how do they relate to molecules?
Ans. Atoms are the basic building blocks of matter, consisting of a nucleus made up of protons and neutrons, surrounded by electrons. Molecules are formed when two or more atoms bond together chemically. The arrangement and type of atoms in a molecule determine its properties and functions.
2. What is the difference between an element and a compound?
Ans. An element is a pure substance that consists of only one type of atom, such as hydrogen (H) or oxygen (O). A compound, on the other hand, is a substance formed when two or more different types of atoms bond together in fixed ratios, such as water (H2O), which consists of two hydrogen atoms and one oxygen atom.
3. How do chemical bonds form between atoms?
Ans. Chemical bonds form when atoms interact through their electrons. There are mainly two types of chemical bonds: ionic and covalent. Ionic bonds occur when one atom transfers an electron to another, creating charged ions that attract each other. Covalent bonds form when atoms share electrons, allowing them to achieve stable electron configurations.
4. What is the significance of the periodic table in understanding atoms and molecules?
Ans. The periodic table organizes all known elements based on their atomic number and properties. It provides essential information about the elements, including their atomic mass, electron configuration, and reactivity. Understanding the periodic table helps in predicting how elements will interact and form molecules.
5. Can molecules be broken down into simpler substances?
Ans. Yes, molecules can be broken down into simpler substances through chemical reactions. This process may involve breaking the bonds between atoms within the molecule, resulting in the formation of individual atoms or simpler compounds. However, atoms themselves cannot be broken down into simpler substances through chemical means, as they are the fundamental units of matter.
84 videos|384 docs|61 tests

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