
Concept explainers
(a)
Interpretation:An example of a
Concept Introduction: When one or more chemicals are changed into one or more other chemicals, a chemical reaction takes place. For example, Iron and oxygen combine to form rust.
(a)

Answer to Problem 2RQ
Color change during a chemical reaction shows a chemical reaction. A chemical reaction is not always visible by naked eyes,but sometimes it results in an impressive color change.
Explanation of Solution
When two or more substances combine, they form one or more products. These products have different molecular structures from the reactants i.e. they absorb and radiate light in different ways, gives color change during a chemical reaction.
Example-When copper reacts with the oxygen, water and CO2, a reddish-brown color appears in this reaction.
The reaction is represented as follows:
(b)
Interpretation: An example of a chemical reaction where precipitation takes place needs to be given.
Concept Introduction: When one or more chemicals are changed into one or more other chemicals, a chemical reaction takes place.
(b)

Answer to Problem 2RQ
In any reaction, reactants form products. When the solubility of a product formed is less than the reactant, then the product precipitates out of the solution as a solid and this solid is known as a Precipitate.
Explanation of Solution
When silver nitrate reacts with sodium chloride, silver chloride will separate as a solid. This showsa precipitation reaction.
The reaction is represented as follows:
(c)
Interpretation: An example of a chemical reaction where bubbles formed needs to be given.
Concept Introduction: When one or more chemicals are changed into one or more other chemicals, a chemical reaction takes place.
(c)

Answer to Problem 2RQ
Bubbles formation during a chemical reaction shows the release of any gas formed during a chemical reaction.
Explanation of Solution
The reaction is represented as follows:
(d)
Interpretation: An example of a chemical reaction where combustion takes place needs to be given.
Concept Introduction: When one or more chemicals are changed into one or more other chemicals, a chemical reaction takes place.
(d)

Answer to Problem 2RQ
A combustion reaction is commonly known as burning. A combustion reaction involves a reaction between any combustible materials.
Explanation of Solution
Combustion reaction generally occurs when a hydrocarbon reacts with oxygen and form CO2 and H2O.
Example: Combustion of methane is represented as follows:
Chapter 7 Solutions
World of Chemistry, 3rd edition
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