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Chemical Reaction and Equations — Flashcards

NIOS · Class 10 · Science & Tech

36 flashcards for Chemical Reaction and Equations (NIOS Class 10 Science & Tech) to test yourself on key terms and facts.

45 questions36 flashcards10 formulas & key relations5 concepts

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A comparison diagram illustrating the differences between physical changes (e.g., melting ice, boiling water, tearing paper) where no new substance is formed, and chemical changes (e.g., burning wood,
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36 Flashcards·
Chemical equationsBalanced equationsCombination reactionBalancing equationsBalancing rulesDisplacement reactionReaction with steam
Card 1Chemical equations

What is a chemical equation?

Answer

A chemical equation is a shorthand description of a chemical reaction. Reactants are written on the left, products on the right, and an arrow shows the change. A plus sign is used when there is more t…

Card 2Balanced equations

Why must a chemical equation be balanced?

Answer

A chemical equation must be balanced because the number of atoms of each element must be equal on both sides, following the law of conservation of mass. A balanced equation also helps in calculating q…

Card 3Combination reaction

What is the balanced equation for magnesium burning in oxygen?

Answer

Balanced equation: 2Mg + O2 -> 2MgO. Magnesium combines with oxygen to form magnesium oxide. This is a combination reaction.

Card 4Balancing equations

Why is Mg + O2 -> MgO called a skeletal equation?

Answer

It is a skeletal chemical equation because the number of atoms is not equal on both sides. It is not balanced. The correct balanced form is 2Mg + O2 -> 2MgO.

Card 5Balancing equations

How does the hit and trial method balance an equation?

Answer

The equation is balanced by placing suitable coefficients before formulas without changing subscripts. The simplest whole numbers are used until the number of atoms of each element becomes equal on bo…

Card 6Balancing rules

What precaution must be taken while balancing chemical equations?

Answer

Subscripts in the formulae must not be changed. Only coefficients may be changed. Changing a subscript changes the identity of the substance, such as turning NO2 into N2O4.

Card 7Displacement reaction

What is the balanced equation for zinc reacting with dilute sulphuric acid?

Answer

Balanced equation: Zn + H2SO4 -> ZnSO4 + H2. Zinc sulphate and hydrogen gas are formed. This equation is already balanced.

Card 8Reaction with steam

What happens when iron is heated with steam?

Answer

Balanced equation: 3Fe + 4H2O -> Fe3O4 + 4H2. Iron reacts with steam to form magnetic oxide of iron and hydrogen gas.

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Frequently Asked Questions

What are the important topics in Chemical Reaction and Equations for NIOS Class 10 Science & Tech?
Key topics in Chemical Reaction and Equations include Chemical Changes and Chemical Equations, Balancing Equations and Important Conditions, Mole, Mass, and Volume Relations, Types of Chemical Reactions. Study these first, then practise questions on each for the NIOS Class 10 board exam.
How many flashcards are available for Chemical Reaction and Equations?
There are 36 flashcards for Chemical Reaction and Equations covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Chemical Reaction and Equations for the NIOS Class 10 board exam?
Learn the core ideas first, then work through the 45 practice questions on Chemical Reaction and Equations. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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