Concept explainers
(a)
Interpretation:
Whether the oxygen is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any
(a)
Answer to Problem 2.10P
Oxygen is an element.
Explanation of Solution
It contains similar atoms. So, from the definition; the substance having a similar atom is called an element. Therefore, oxygen is an element.
(b)
Interpretation:
Whether table salt is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
(b)
Answer to Problem 2.10P
Table salt is a mixture.
Explanation of Solution
The table salt is 99% sodium chloride, but it has trace elements of other salts present in it. Thus, it is not a compound but it is a mixture.
(c)
Interpretation:
Whether the seawater is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
(c)
Answer to Problem 2.10P
Sea water is a mixture.
Explanation of Solution
In sea water, different amount of salt and water is present. The salt can be separated by without any chemical process. So, it is a mixture.
d.
Interpretation:
Whether wine is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
d.
Answer to Problem 2.10P
Wine is a mixture.
Explanation of Solution
In wine, different amount of ethyl alcohol and water is present. So, it is a mixture.
e.
Interpretation:
Whether air is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
e.
Answer to Problem 2.10P
Air is a mixture.
Explanation of Solution
In air different amount of different gasses are present like oxygen, carbon dioxide, and nitrogen. So, it is a mixture.
f.
Interpretation:
Whether silver is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
f.
Answer to Problem 2.10P
Silver is an element.
Explanation of Solution
In silver only, identical atoms of silver are present. So, it is an element.
g.
Interpretation:
Whether diamond is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
g.
Answer to Problem 2.10P
Diamond is a compound.
Explanation of Solution
It is one of the allotropes of carbon. It is made up carbon atoms. So, it is a compound.
h.
Interpretation:
Whether a pebble is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
h.
Answer to Problem 2.10P
A pebble is a mixture.
Explanation of Solution
It is composed of fragments of rocks, which are made up of sand, dirt, and various particles in any proportion. A mixture is a combination of two or more pure substances in any mass ratio. So, it is a mixture.
i.
Interpretation:
Whether gasoline is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
i.
Answer to Problem 2.10P
Gasoline is a mixture.
Explanation of Solution
It is made up of flammable liquid hydrocarbons derived from crude petroleum. A mixture is a combination of two or more pure substances in any mass ratio. Thus, it is a mixture.
J
Interpretation:
Whether milk is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
J
Answer to Problem 2.10P
Milk is a mixture
Explanation of Solution
It contains water, fats, and proteins in indefinite proportions. A mixture is a combination of two or more pure substances in any mass ratio. So, milk is a mixture.
k.
Interpretation:
Whether carbon dioxide is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
k.
Answer to Problem 2.10P
Carbon dioxide is a compound.
Explanation of Solution
It is made up of carbon and oxygen in a ratio of 1:2. A compound is a pure substance made up of two or more elements in a fixed ratio by mass. So, it is a compound.
l.
Interpretation:
Whether bronze is classified as an element, a compound or a mixture should be identified.
Concept Introduction:
The substance having a similar atom is called an element. When two or more elements combined together chemically they form a pure substance called a compound. But in the case of a mixture, it is formed when two substances joined together without any chemical bonding. An example of a compound is H2O, and an example of an element is N, an example of a mixture is a mixture of sand and sugar.
l.
Answer to Problem 2.10P
Bronze is a mixture.
Explanation of Solution
It is an alloy of copper and tin. An alloy is a substance made by melting two or more metals together to enhance the strength. A mixture is a combination of two or more pure substances in any mass ratio. So, it is a mixture.
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Chapter 2 Solutions
Introduction to General, Organic and Biochemistry
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