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What does one mean by exothermic and endothermic reactions? Gi

Science

Class 10

NCERT

Chapter 1: Chemical Reactions and Equations

34 questions

Write the balanced chemical equation for the following and identify the type of reaction in each case:

(a) Potassium bromide(aq) + Barium iodide(aq)

\to

Potassium iodide(aq) + Barium bromide(s)

(b) Zinc carbonate(s)

\to

Zinc oxide(s) + Carbon dioxide(g)

\to

Hydrogen chloride(g)

(d) Magnesium(s) + Hydrochloric acid(aq)

\to

Magnesium chloride(aq) + Hydrogen(g)

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

Why is respiration considered an exothermic reaction? Explain.

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Question

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Solving time: 3 mins

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

Views: 6,900 students

Updated on: Aug 4, 2023

Book:

Science (NCERT)

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Text solutionVerified

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

of energy for each mole of salt that is produced:

2 N a (s) + C l_{2} (s) \to 2 N a Cl (s) + e n er 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.

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Practice more questions from Science (NCERT)

Write the balanced chemical equation for the following and identify the type of reaction in each case:

(a) Potassium bromide(aq) + Barium iodide(aq)

\to

Potassium iodide(aq) + Barium bromide(s)

(b) Zinc carbonate(s)

\to

Zinc oxide(s) + Carbon dioxide(g)

\to

Hydrogen chloride(g)

(d) Magnesium(s) + Hydrochloric acid(aq)

\to

Magnesium chloride(aq) + Hydrogen(g)

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

Why is respiration considered an exothermic reaction? Explain.

View all

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Question Text	What does one mean by exothermic and endothermic reactions? Give examples.
Updated On	Aug 4, 2023
Topic	Chemical Reactions and Equations
Subject	Science
Class	Class 10
Answer Type	Text solution:1 Video solution: 4
Upvotes	556
Avg. Video Duration	5 min

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

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