Class 10 Exam > Class 10 Notes > Science Class 10 > Very Short Questions: Chemical Reactions and Equations
Class 10 Science Chapter 1 Question Answers - Chemical Reactions and Equations
Q1: What happens when magnesium ribbon burns in the air?
Ans: When magnesium ribbon burns in the air, it combines with the oxygen to form magnesium oxide.
2Mg(s) + O2 (g) → 2MgO(s)
Q2: On what chemical law, the balancing of chemical equations is based?
Ans: The balancing of a chemical equation is based on the law of conservation of mass.
Q3: Name the gas that evolved when zinc reacts with dil. HCl.
Ans: Hydrogen gas is evolved.
When HCl , which is an acid goes into the chemical reaction with the Zinc metal, the reaction occurs by vigorously bubbles, which are due to the formation of Hydrogen gas.
Q4: Name and state the law which is kept in mind while we balance a chemical equation.
Ans: Law of conservation of mass. Mass can neither be created nor destroyed during a chemical reaction.
Q5: Write the chemical equation for reactions that take place when lead nitrate and potassium iodide solutions are mixed.
Ans: Pb(NO3)2 + 2KI → 2KNO3 + PbI2
Lead nitrate + Potassium iodide → Potassium nitrate + Leadiodide
Q6: Why is photosynthesis considered an endothermic reaction?
Ans: Photosynthesis is considered an endothermic reaction because heat is absorbed in this process.
Q7: What is precipitate?
Ans: Precipitate is an insoluble metal compound formed after a reaction.
Q8: Why is the combustion of Liquified Petroleum Gas (LPG) a chemical change?
Ans: Combustion of Liquified Petroleum Gas (LPG) is a chemical change because, after its combustion, a new substance is formed and cannot be turned back into LPG.
Q9: What is wrong with the following equation?
Mg + O ➝ MgO
Identify the mistake and balance the equation.
Ans: In this equation, oxygen should be in molecular form (O2).
2Mg + O2 ➝ 2MgO.
Q10: What is meant by the skeletal equation?
Ans: The equation where the number of atoms of each element on both sides of a chemical equation is not equal is called a skeletal equation.
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FAQs on Class 10 Science Chapter 1 Question Answers - Chemical Reactions and Equations
| 1. What is a chemical reaction? |  |
Ans. A chemical reaction is a process in which one or more substances (reactants) are converted into new substances (products) with different chemical properties.
| 2. What is a chemical equation? | |
Ans. A chemical equation is a symbolic representation of a chemical reaction, where the reactants are written on the left side and the products on the right side, separated by an arrow.
| 3. How can we balance a chemical equation? | |
Ans. To balance a chemical equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. This can be achieved by adjusting the coefficients in front of the reactants and products.
| 4. What are the types of chemical reactions? | |
Ans. There are several types of chemical reactions, including synthesis (combination), decomposition, displacement, precipitation, and combustion reactions.
| 5. What is the importance of chemical reactions in everyday life? | |
Ans. Chemical reactions are essential for various processes in everyday life, such as digestion, respiration, photosynthesis, and the production of various materials like medicines, plastics, and fuels. They play a crucial role in maintaining life and driving various industries.
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