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Question-1

What is the main reason for the difference between solutions, colloids and suspensions?

Solution:
  • Elements are pure substance consisting of one type of atom
  • Compounds are pure substances that can be separated into two or more elements
  • Mixtures are substances mixed together but not combined (like a salad, you dont morph carrots and lettuce together you just throw them in alongside each other)
  • Solutions are homogeneous mixtures composed of two or more substances where the solute is completely dissolved into the solvent
Suspensions are heterogeneous mixtures containing visible solid particles
Colloids are substances microscopically dispersed evenly throughout another substance

Question-2

Define the term heterogeneous.

Solution:
Heterogeneous means that the substance does not have the same properties or characteristics throughout its bulk.

Question-3

Write a note on elements and compounds.

Solution:
An element is simple substance which cannot be further divided into simple ones. Elements combine to form compounds. Atoms are fundamental particles of elements. e.g. Oxygen, Iron, Hydrogen.

Compounds are chemical combination of two or more elements. They can be decomposed into elements. Molecules are the fundamental particles of compounds. e.g.water, sugar, hydrogen etc.

Question-4

Write a note on mixtures.

Solution:
When two or more elements or compounds are brought together, they merely mix together without losing their individual properties. These are called mixtures. A mixture may be defined as that containing two or more substances in varying compositions. It is a mixture of several gases. It contains elements such as oxygen, nitrogen and compounds such as CO2 and water vapour.

Question-5

Tabulate the differences between elements and compound.

Solution:

 

No.

Element

Compound

1.

An element is a simple substance which can not he further divided into simple ones.

A compound is a chemical combination of two or more elements.

2.

Elements combine to form compounds.

Compounds can be decomposed into elements.

3.

Atoms are fundamental particles of elements.

Molecules are the fundamental particles of compounds.

4.

E.g: Oxygen, Iron, Hydrogen, etc.

E.g. : Water, sugar, Hydrogen, etc. Carbon disulphide, etc.

 

Question-6

Tabulate the differences between compounds and mixture.

Solution:

 

No.

Compounds

Mixtures

1.

They are made up of two or more elements which are chemically combined.

They are made up of two or more substances which are not chemically combined.

2.

A compound has a definite composition

The composition of a mixture may vary widely by weight.

3.

Properties of a compound are different from those of the constituent elements.

The properties of a mixture be separated by physical methods.

4.

The constituent elements compound cannot be can separated by physical methods.

The constituent of a mixture be separated by physical methods.

5.

A compound is always homogeneous.

A mixture may or may not be homogeneous

 

Question-7

What are the characteristics of suspensions?

Solution:
1. A suspension is a heterogeneous mixture.

2. The size of solute particles in a suspension is quite large. It is larger than 10-5 cm in diameter.

3. The particles of a suspension can be seen easily.

4. The particles of a suspension do not pass through a filter paper. So, a suspension can be separated by filtration.

5. The suspensions are unstable. The particles of a suspension settle down after some time.

6. A suspension scatters a beam of light passing through it.

Question-8

Classify the following as elements, compounds and mixtures.

Solution:
1) Milk - mixture

2) Oxygen -element

3) Water - compound

4) Air - mixture

5) Bromine -element

Question-9

Write the constituent element of potassium hydroxide and sodium chloride.

Solution:
The constituent element of potassium hydroxide is K, H and O and sodium chloride is Na and Cl.

Question-10

Define solution. Give example.
Elements which have properties in between metals and non-metals are called metalloids.

Solution:
A solution is a homogenous mixture that is also homogenous at the particle level. A solution is formed when tiny individual particles of one substance are uniformly dispersed among the individual particles of the other substance. An example of a solution is sugar water.




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