Jigyasa purchased a packet of salt and Milk on which ‘PURE’ is written. Here the word Pure
suggests that these consumables do not have any adulteration in them.
Gyan, Are they scientifically pure too?
No DiDi, scientifically a “Pure substance” means all of its constituents must
have the same chemical nature, but here it is not so. Like Milk is a mixture of
water, Fats and protein etc. which have different chemical properties.
Most of the substances/matter around us is mixtures only like Air, Soil, and
Milk etc
The substances that are
formed by simple mixing
of two or more pure
elements or compounds
where no chemical
reaction takes place are
called as Mixtures. The
components of a mixture
can be separated by
physical methods like
filtration, boiling, using a
magnet etc.
Mixture
MmMIXTURE
मिश्रण
Homogeneous Mixture:
A mixture in which the
constituents are
uniformly distributed
throughout without any
clear boundary of
separation. The
constituents are not easily
visible.eg mixture of
sugar, salt and water, Air.
Heterogeneous Mixture:
A mixture in which the
constituents are not
uniformly distributed
throughout and has visible
boundary of separation
between its constituents.
eg. sugar and sand
mixture, dirty water, salt
and iron filings mixture
Check Yourself: -
1. What do you understand by the term Mixture?
2. Write the differences between Homogeneous and Heterogeneous mixtures with
examples.
3. Categorise the following as Homogeneous and Heterogeneous mixtures:
Mixture of Chalk and soil, mixture of Wheat Flour and water, Soda Water and alloys.
upar padke answe btao or apne aap se btao help
Answers
What is a Mixture?
A substance, on the other hand, is impure if it consists of different kinds of elements combined together physically and not chemically. Impure substances also called mixtures. Mixtures are further divided into a homogenous or heterogeneous mixture.
A homogeneous mixture occasionally called a solution, is comparatively unvarying in configuration or constant. Every unit of the mixture is like every other unit. For instance, if you liquefy sugar in water and blend it really well, your concoction is essentially the same no matter where you sample it. This mixture contains two or more chemical substances.
A heterogeneous mixture is a concoction whose configuration varies from spot to spot within the sample. For example, if you put a little amount of sugar in a vessel, add some sand, and then shake the jar a couple of times, your concoction doesn’t have the same configuration all throughout the jar. As the sand is heftier, there’s possibly more amount of sand at the bottom of the jar and more sugar at the top part. These mixtures can be identified visually and separated easily by physical means.
Characteristics And Properties Of Mixtures Or Impure Substance
It does not have any specific properties, the properties of the mixture are a result of the average properties of all the constituents.
It is formed as a result of a physical change.
They have a variable composition.
Their melting and boiling points differ.
Example Of Mixtures
Some common examples of mixtures include;
Gas and gas like nitrogen and oxygen in the atmosphere.
A solution like water and oil.
Gas and liquid such as water.
Solid and liquid such as sand and water
Answer: Difference between Homogeneous and Heterogeneous Mixture
Homogeneous mixture: It has a non-uniform composition. There are two or more phases. It can be separated out physically. hetero means different. Example: a mixture of sodium chloride and sand
Heterogeneous mixture
It has a uniform composition
It has only one phase
It can’t be separated out physically
‘homo’ means the same
Example: a mixture of alcohol and water
Explanation:
Mixture: When two or more elements or compounds mix together, not necessarily in a definite ratio and do not interact chemically, then the resulting substance is known as a mixture.
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