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DENIUS [597]
4 years ago
13

Which of the following describes a homogeneous mixture? (2 points) Question 18 options: 1) It can be separated by chemical means

but not by physical means. 2) It cannot be separated by either chemical or physical means. 3) It can be separated by physical means and is uniform in composition. 4) It can be separated by physical means and is not uniform in composition.
Chemistry
2 answers:
Svetllana [295]4 years ago
7 0

It can be separated by physical means and is not uniform in composition.

Ghella [55]4 years ago
5 0

Answer: Option (3) is the correct answer.

Explanation:

A mixture that consists of two or more substances mixed in uniform composition then it is known as a homogeneous mixture.

For example, NaCl dissolved in water is a homogeneous mixture.

There will be equal composition of NaCl and water. Therefore, we can obtain NaCl crystals from this solution by evaporating the water.

Hence, we can conclude that the statement it can be separated by physical means and is uniform in composition, describes a homogeneous mixture.

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Answer:

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OLga [1]

Answer:

CH3CHO+H2O → CH3OCH3 - addition

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Explanation:

An addition reaction is a reaction in which a specie is added across the double bond as we can see in CH3CHO+H2O → CH3OCH3.

In an elimination reaction, a small molecule is lost from a saturated compound to form the corresponding unsaturated compound as in CH,CICH CI + Zn → C2H4 + ZnCl2

In a substitution reaction, a chemical moiety replaces another in a molecule as in; CH3CH3Br + OH – CH3CH3OH + Br .

A condensation reaction is in which two molecules are joined together to form a bigger molecule as in; 2CH2COOH >>(CH3CO)20 + H20.

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If you would’ve attached a picture I’m sure it would’ve been a lot easier.
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A gel is a semisolid preparation that contains a gelling agent which provides stiffness to the preparation.

The gelling agent can be, for example, agarose (this gelling agent is used to prepare gels in electrophoresis).

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