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10th Class: Chemical Reactions

Created by

@WellRunDeStijl

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Questions and Answers

What is the primary reason for cleaning the magnesium ribbon with sandpaper before burning it in air?

To add oxygen to the reaction

To increase the surface area of the ribbon

To remove the protective layer of basic magnesium carbonate (correct)

To decrease the rate of reaction

What is the result of the transformation of a chemical substance into another chemical substance?

The original substance is recovered

A physical change takes place

A new substance with similar properties is formed

A chemical change takes place (correct)

What is the term for the new substance produced as a result of a chemical reaction?

Product (correct)

Catalyst

Reactant

Reagent

What is the characteristic of the chemical reaction between zinc and dilute sulphuric acid?

Evolution of hydrogen gas Signup and view all the answers

What happens to the atoms in a chemical reaction?

Atoms are rearranged Signup and view all the answers

What is the term for the substances that take part in a chemical reaction?

Reactants Signup and view all the answers

What is the characteristic of the chemical reaction between citric acid and purple coloured potassium permanganate solution?

Change in colour Signup and view all the answers

What is the product of the combustion reaction of candle wax?

Water, carbon dioxide and heat Signup and view all the answers

What is the direction of the arrow in a chemical equation?

It shows the direction of the chemical reaction Signup and view all the answers

What is the type of chemical equation that has the number of atoms of each element equal on both sides?

Balanced Chemical Equation Signup and view all the answers

What is the chemical reaction that is characterised by a change in temperature and formation of a white precipitate?

The reaction between sulphuric acid and barium chloride solution Signup and view all the answers

What is the law that states that mass can neither be created nor destroyed in a chemical reaction?

Law of Conservation of Mass Signup and view all the answers

Study Notes

Chemical Reaction

Chemical Reaction: Transformation of one substance into another, e.g. rusting of iron, setting of milk into curd, digestion of food, respiration, etc.
Characteristics of Chemical Reactions:
- Evolution of gas: e.g. Zn + H2SO4 → ZnSO4 + H2
- Change in Colour: e.g. citric acid and potassium permanganate solution
- Change in state of substance: e.g. combustion of candle wax (solid → liquid → gas)
- Change in temperature: e.g. quick lime water to form slaked lime
- Formation of precipitate: e.g. sulphuric acid and barium chloride solution

Chemical Equation

Chemical Equation: Representation of chemical reaction using symbols and formulae of substances
Example: A + B → C + D (A and B are reactants, C and D are products)
Types of Chemical Equations:
- Balanced Chemical Equation: Number of atoms of each element equal on both sides, e.g. Zn + H2SO4 → ZnSO4 + H2
- Unbalanced Chemical Equation

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Description

Learn about chemical reactions, the process of transforming one substance into another, and the resulting changes in properties. Explore examples like rusting of iron and digestion of food.