CBSE Class 10 Science Notes

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Questions and Answers

What is the purpose of a word equation in chemistry?

  • To identify the reactants and products in a chemical reaction using words (correct)
  • To determine the evolution of gas in a chemical reaction
  • To showcase the color changes in a chemical reaction
  • To represent chemical reactions using only chemical formulas

How are the reactants represented in a word equation?

  • Separated by a plus sign on the left side of the equation (correct)
  • In a separate document
  • On the right side of the equation
  • Using chemical formulas

What determines the rate of a chemical reaction?

  • Types of products formed
  • Temperature and pressure
  • Number of reactants
  • Activation energy and concentration of reactants (correct)

Which observation helps determine a chemical reaction?

<p>Formation of a precipitate (B)</p> Signup and view all the answers

In a chemical reaction, what happens to reactants?

<p>They transform into products by making or breaking bonds (A)</p> Signup and view all the answers

Why do reaction speeds often increase as temperature rises?

<p>Since more thermal energy is available to attain activation energy (C)</p> Signup and view all the answers

What is a chemical reaction?

<p>When one or more reactants are changed into one or more products due to molecular interaction (A)</p> Signup and view all the answers

What is the difference between a chemical change and a physical change?

<p>Chemical change results in new substances with new properties, while physical change does not create new substances (A)</p> Signup and view all the answers

Which of the following is an example of a physical change?

<p>Boiling water to form steam (D)</p> Signup and view all the answers

In a chemical reaction, what happens to the constituent atoms of reactants?

<p>They rearrange to form new substances (D)</p> Signup and view all the answers

What occurs during a physical change?

<p>Color or state changes, but no new substances are formed (B)</p> Signup and view all the answers

Which reaction results in the formation of two new substances?

<p>$ ext{CuSO}_4$ reacts with iron (C)</p> Signup and view all the answers

Flashcards

Word Equation Purpose

Identifies reactants and products in a chemical reaction using names.

Reactant Representation

Reactants are on the left side of a chemical equation; separated by a plus.

Reaction Rate Factors

Activation energy and concentration of reactants.

Evidence of Reaction

Formation of a precipitate (a solid forming from a liquid solution).

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Reactant Transformation

Reactants transform into products by making or breaking chemical bonds.

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Temperature Effect

Higher temperature provides more thermal energy to reach activation energy, thus speeding up the process.

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Chemical Reaction

One or more reactants change into one or more products through molecular interaction.

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Chemical vs. Physical

New substances form with new properties in a chemical change, but not in physical.

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Physical Change Example

Boiling water to form steam.

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Atomic Rearrangement

Atoms rearrange to form new substances.

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Physical Change

Color or state changes, but no new substances are formed.

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Substance Formation

Reaction of $CuSO_4$ with iron results in the formation of new substances.

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Study Notes

Importance of CBSE Class 10 Science Notes

  • CBSE Notes for Class 10 Science are essential study materials for students to score good marks in the board exam.
  • Chapter-wise CBSE Class 10 Notes provide detailed explanations, illustrative examples, solved questions, and sample questions from NCERT books.

Chemical Reactions and Equations

  • A chemical reaction occurs when one or more reactants are changed into one or more products, resulting in the formation of various substances with new physical and chemical properties.
  • Chemical change involves the formation of one or more new substances with new physical and chemical properties.
  • Physical change involves a change in colour or state, but no new substance is formed.

Types of Chemical Reactions

  • Combination reactions
  • Decomposition reactions
  • Single displacement reactions
  • Double displacement reactions
  • Redox reactions
  • Endothermic reactions
  • Exothermic reactions
  • Precipitation reactions
  • Neutralisation reactions

Observations that Help Determine a Chemical Reaction

  • Evolution of a gas
  • Change in temperature
  • Formation of a precipitate
  • Change in colour
  • Change of state

Chemical Equations

  • A chemical equation is a shorthand way of expressing a chemical reaction.
  • A word equation is a chemical reaction expressed in words rather than chemical formulas.
  • A word equation helps identify the reactants and products in a chemical reaction.
  • Reactants are shown on the left side of a word equation, separated by a plus sign (+) if there is more than one reactant.
  • Products are shown on the right side of a word equation, separated by a plus sign (+) if there is more than one product.

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