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FAQs on Chemistry Handwritten Notes - MBBS

1. What is the periodic table in chemistry?
Ans. The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. It provides a systematic way to understand the relationships between different elements and their properties.
2. What are valence electrons and why are they important in chemistry?
Ans. Valence electrons are the electrons in the outermost energy level of an atom. They play a crucial role in determining the chemical behavior of an element, as they are involved in bonding with other atoms. The number of valence electrons in an atom determines its reactivity and the types of chemical bonds it can form.
3. What is the difference between an element and a compound in chemistry?
Ans. An element is a substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom. On the other hand, a compound is a substance composed of two or more different elements chemically bonded together. Compounds have unique properties that differ from those of their constituent elements.
4. How does an acid differ from a base in chemistry?
Ans. Acids and bases are two types of chemical substances with distinct properties. Acids have a sour taste, can react with metals to produce hydrogen gas, turn blue litmus paper red, and have a pH value less than 7. Bases, on the other hand, have a bitter taste, feel slippery, turn red litmus paper blue, and have a pH value greater than 7. They can neutralize acids and form salts.
5. What is the difference between a physical change and a chemical change in chemistry?
Ans. A physical change is a change in the physical properties of a substance without altering its chemical composition. Examples include changes in state (e.g., melting, freezing) or changes in shape. In contrast, a chemical change involves the formation or breaking of chemical bonds, resulting in the formation of new substances with different chemical properties. Examples include combustion, rusting, or digestion.
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