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Introduction to Chemical Reactions Video Lecture - Class 10
FAQs on Introduction to Chemical Reactions Video Lecture - Class 10
| 1. What is a chemical reaction? |  |
Ans. A chemical reaction is a process in which one or more substances, known as reactants, undergo a transformation to form different substances, known as products. During a chemical reaction, the bonds between atoms in the reactants are broken and new bonds are formed to create the products.
| 2. What are the different types of chemical reactions? | |
Ans. There are several types of chemical reactions, including:
- Combination reactions: Two or more substances combine to form a single product.
- Decomposition reactions: A single reactant breaks down into two or more simpler substances.
- Displacement reactions: An element in a compound is replaced by another element.
- Double displacement reactions: Positive ions in two compounds switch places.
- Redox reactions: Reactions involving transfer of electrons between reactants.
| 3. How can chemical reactions be represented? | |
Ans. Chemical reactions can be represented using chemical equations. In a chemical equation, the reactants are written on the left side and the products are written on the right side, separated by an arrow. The numbers in front of each substance represent the coefficients, indicating the relative amounts of each substance involved in the reaction.
| 4. What is the law of conservation of mass in chemical reactions? | |
Ans. The law of conservation of mass states that in a chemical reaction, matter is neither created nor destroyed. This means that the total mass of the reactants must be equal to the total mass of the products. The number of atoms of each element must also be the same on both sides of the chemical equation.
| 5. How can we determine if a chemical reaction has occurred? | |
Ans. There are several signs that indicate a chemical reaction has occurred:
- Formation of a precipitate: A solid substance forms when two solutions are mixed.
- Evolution of gas: Bubbles or a gas is released during the reaction.
- Change in color: The color of the reactants or products changes.
- Release or absorption of energy: Heat, light, or sound is released or absorbed.
- Change in odor: The reactants or products have a different smell.
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