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3 years ago

1. Distinguish between a mixture and a pure substance.

Chemistry

2 answers:

Marina CMI [18]3 years ago

4 0

Answer:

1)Mixture is the combination of substance

2)There are two types of mixture such as heterogeneous mixture and homogeneous mixture

3)foreg=Salt solution ,sedimentation

Pure substance

1)Pure substances are also called elements

2)They are made up of small atoms

3)for eg= oxygen,Venadium ,Iron,Oxygen

Korvikt [17]3 years ago

3 0

Mixture - A mixture is a substance which consist of two or more elements or compounds not chemically combined together.

For Example : Air is a mixture of gases like oxygen,nitrogen,argon,carbon dioxide etc.

Pure Substance - A pure substance is a substance which has only one type of atoms or molecules thereby having a constant composition and structure.

For Example : Hydrogen gas , Gold metal , Sugar , Baking soda, Ammonia , Diamond and etc.

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Answer:

See explanation below

Explanation:

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In the case of the ethyl acetoacetate, the protons that are in the methylene group (CH3 - CO - CH2 - COOCH2CH3) are the more acidic protons, therefore the etoxide will substract these protons instead of the protons of the methyl groups. This is because those hydrogens (in the methylene group) are between two carbonile groups, which make them more available and acidic for any reaction. As we have 2 equivalents of etoxide, means that it will substract both of the hydrogen atoms there, and then, reacts with the Br - CH2CH2 - Br and form a product of an aldolic condensation.

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4 years ago

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Answer:

100 °C, because it is the boiling point of water.

Explanation:

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3 years ago

The wavelenght of a wave is 0.5 meters,and its period is 2 seconds .what is the speed of this wave?

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3 years ago

An ionic bond can be formed between

Marina86 [1]

Answer:

Two unlike charged ions.

Explanation:

The positive charge on one and the negative on the other helps form the ionic bond.

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3 years ago

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<u>Answer:</u>

2.0158 grams

<u>Explantion:</u>

We are to find the mass of the hydrogen atoms in 1 mole of water.

We know that the formula of water is: $H_2O$