NCERT Solutions for Class 10 Science Chapter 1 Free PDF Download

Q: Question 1. What happens when dilute hydrochloric acid is added to iron filings? A. Hydrogen gas and iron chloride are produced B. Chlorine gas and iron hydroxide are produced C. No reaction takes place D. Iron salt and water are produced

Answer: When dilute HCl is added to iron fillings the reaction proceeds as: 2HCl+Fe→FeCl2+H2(g) In the reaction hydrogen gas and iron chloride are produced.

Q: Question 2. What is a balanced chemical equation? Why should chemical equations be balanced?

Answer: A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow. A chemical equation is a written symbolic representation of a chemical reaction. The reactant chemical(s) are given on the left-hand side and the product chemical(s) on the right-hand side. The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, so the number of atoms that are present in the reactants has to balance the number of atoms that are present in the products.

Q: Question 3. What does one mean by exothermic and endothermic reactions? Give examples.

Answer: The chemical reactions release energy in the form of heat, light, or sound, are called exothermic reactions. An exothermic reaction occurs when the temperature of a system increases due to the evolution of heat. This heat is released into the surroundings, resulting in an overall negative quantity for the heat of reaction. An example of an exothermic reaction is the mixture of sodium and chlorine to yield table salt. This reaction produces 411kJ energy for each mole of salt that is produced: 2Na(s)+Cl2(s)→2NaCl(s)+energy The chemical reactions that must absorb energy in order to proceed are known as endothermic reactions. An endothermic reaction occurs when the temperature of an isolated system decreases while the surroundings of a non-isolated system gain heat. Endothermic reactions result in an overall positive heat of reaction. Photosynthesis is an example of an endothermic chemical reaction. In this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen.

Q: Question 4. Why is respiration considered an exothermic reaction? Explain.

Answer: Respiration is a burning process of food in the body to produce energy. Respiration is considered as an exothermic reaction because, in the respiration process, oxidation of glucose takes place which produces a large amount of heat energy which stored in the form of ATP. This is shown in the following chemical equation C6H12O6+6O2→6CO2+H2O+energy (ATP)

NCERT Solutions for Class 10 Science Chapter 1 – Chemical Reactions and Equations

NCERT Solutions for Class 10 Science Chapter 1 let the students solve and revise the whole syllabus very effectively. After covering all the stepwise solutions given by our subject expert teachers, the student will be able to score good marks.

Class 10 plays an extremely important role in every students’ career as it is the period when a student comes across some serious syllabus content. Our NCERT for Class 10 Chapter 1 is complete package providing all topics, contents, problems, and most importantly self-explanatory solutions. NCERT Solutions for Class 10 Chapter 1 will help the students to solve all types of problems related to all the topics. Toppr.com or the Toppr App provides you quality answers to all your questions related to the basic concepts of Chemistry.

Our specialized team of expert teachers has created these NCERT Solutions considering the curriculum, the pattern of board exams and need of students. We will help you to get complete NCERT Solutions for Class 10 Science and other subjects. We are providing you the free PDF download links of the class 10 Chapter 1.

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CBSE Class 10 Science Chapter 1 NCERT Solutions

In this initial chapter of Science of Class 10 will help the students to learn about the basics of chemicals and their respective reactions with different chemicals and compounds. The reaction between 2 chemicals is not always balanced. There is a need to balance the reactions. In this chapter, students will know about the balancing of the chemical reactions.

The chapter also deals with various types of chemical reactions like Combination reactions, Disproportion reaction, etc. This chapter plays an important role in science syllabus as the students will be able to understand the basic concepts of chemicals and their reactions which will help them to understand further topics in a better way. In this chapter, you will find a total of 20 questions with MCQs, balancing questions, short and long answer type questions, etc.

ncert solutions for class 10 science chapter 1

Topics Covered under NCERT Solutions for Class 10 Science Chapter 1

Ex. 1.1: Introduction to Chemical Reactions
Ex. 1.2: Balancing of Chemical Reactions
Ex. 1.3: Types of Chemical Reactions
Ex. 1.4: Corrosion and Rancidity

1.1: Introduction to Chemical Reactions

In the initial phase, the chapter talks about the introduction to chemicals and their reactions. The students will learn about how to form chemical reactions’ equations. The chapter provides step by step process to form these reactions. This basic way of teaching will help the students to build equations easily.

1.2: Balancing of Chemical Reactions

All chemicals cannot react with different chemicals without proper balancing. So, this part of the chapter will help you to balance both the sides of the chemical reaction through step by step approach.

1.3: Types of Chemical Reactions

Chemical Reactions seems to be an easy term but in practice, it is not that simple. There are various types of chemical reactions like Combination reaction, Displacement reaction, Decomposition reaction, Double Displacement Reaction, etc.

1.4: Corrosion and Rancidity

Tarnishing of a metal is known as Corrosion whereas oxidation of fats and oils is known as Rancidity. Students will come to know about the various practical life incidents where corrosion and rancidity exists.

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Solved Questions For You:

Question 1. What happens when dilute hydrochloric acid is added to iron filings?

A. Hydrogen gas and iron chloride are produced

B. Chlorine gas and iron hydroxide are produced

C. No reaction takes place

D. Iron salt and water are produced

Answer:

When dilute $H C l$ is added to iron fillings the reaction proceeds as:

2 H C l + F e \to F e C l_{2} + H_{2} (g)

In the reaction hydrogen gas and iron chloride are produced.

Question 2. What is a balanced chemical equation? Why should chemical equations be balanced?

Answer:

A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.

A chemical equation is a written symbolic representation of a chemical reaction. The reactant chemical(s) are given on the left-hand side and the product chemical(s) on the right-hand side. The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, so the number of atoms that are present in the reactants has to balance the number of atoms that are present in the products.

Question 3. What does one mean by exothermic and endothermic reactions? Give examples.

Answer:

The chemical reactions release energy in the form of heat, light, or sound, are called exothermic reactions. An exothermic reaction occurs when the temperature of a system increases due to the evolution of heat. This heat is released into the surroundings, resulting in an overall negative quantity for the heat of reaction.

An example of an exothermic reaction is the mixture of sodium and chlorine to yield table salt. This reaction produces

411 k J

energy for each mole of salt that is produced:

2 N a (s) + C l_{2} (s) \to 2 N a C l (s) + e n e r g y

The chemical reactions that must absorb energy in order to proceed are known as endothermic reactions. An endothermic reaction occurs when the temperature of an isolated system decreases while the surroundings of a non-isolated system gain heat. Endothermic reactions result in an overall positive heat of reaction.

Photosynthesis is an example of an endothermic chemical reaction. In this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen.

Question 4. Why is respiration considered an exothermic reaction? Explain.

Answer:

Respiration is a burning process of food in the body to produce energy. Respiration is considered as an exothermic reaction because, in the respiration process, oxidation of glucose takes place which produces a large amount of heat energy which stored in the form of ATP. This is shown in the following chemical equation