9.4.1 Introduction to Stoichiometry

This is the first lecture from Chapter 4: “Stoichiometry” in the new Class 9 Chemistry book (Punjab Board – PCTB). It briefly discusses the introduction of stoichiometry and its related concepts. The lecture also includes a multiple-choice quiz and short question notes.

MCQs Based Quiz

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Stoichiometry helps us in:

Understanding the structure of matter

Determining the amount of reactants needed in a reactions

Understanding the role of catalyst in a reaction

Optimize the nuclear reactions

2 / 7

Stoichiometry helps us calculate the amounts of reactants and products by using ___.

Temperature of the reaction

Composition of the reactants

Composition of the products

Balanced chemical equation

3 / 7

Stoichiometry is based on ___.

Law of conservation of momentum

Law of conservation of energy

Law of conservation of charge

Law of conservation of mass

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According to law of conservation of mass:

Mass of reactants must not be equal to mass of products

Mass of reactants must be equal to mass of products

Mass of reactants must be double to the mass of products

Mass of reactants must be half of the mass of products

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Stoichiometric coefficients are used to ___.

Determine the temperature of reaction

Determine the properties of reactants

Balance the chemical equation

Study the role of catalyst in a chemical reaction

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How can you get the mole ratio between reactants and products?

From the composition of reactants and products

From ionization energy of reactants and products

From their chemical formulae

From stoichiometric coefficients of chemical equation

7 / 7

To determine the amount of raw materials required to produce a desired amount of products, you would need to use the principles of ___.

Analytical chemistry

Spectrometry

Telemetry

Stoichiometry

Your score is

The average score is 100%

Short Questions

Q1. What is law of conservation of mass?

It is a law which states that matter can neither be created nor destroyed.

Q2. What is stoichiometry?

Stoichiometry is a branch of chemistry that helps us to calculate the amounts of reactants and products by using a balanced chemical equation. It is based on law of conservation of mass.

Q3. How can law of conservation of mass be applied to a chemical reaction?

According to law of conservation of mass, during a chemical reaction, total mass of reactants must be equal to total mass of products.

Q4. What are stoichiometric coefficients?

They are the numbers that used to balance both sides of a chemical equation.

Q5. How can you get the mole ratio between reactants and products?

We can get the mole ratio between reactants and products by using stoichiometric coefficients used in the chemical equation.

Q6. What is the application of stoichiometry in industries?

It is used in industries to determine the amount of raw materials required to produce the desired amount of products.