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4 years ago

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?

1 answer:

5 0

In order to obtain a sample of salt, you should heat the water until it boils and evaporates. The salt won't evaporate and will remain even after all the water is gone.

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What does the monomer unit of Polyester look like? And what’s its chemical formula?

AlladinOne [14]

Answer:

The monomers of polyesters are,

(i) A Dicarboxylic Acid

(ii) A Dialcohol

Explanation:

As depicted from name polyester is a macromolecule which contains numerous ester functional groups. Ester is formed by the condensation of Carboxylic acid and alcohol as shown,

R-COOH + R'OH → RCOOR' + H₂O

Therefore, in order to utilize this reaction for the formation of long chain of polyesters then one can use a dicarboxylic compounds and dialcohol compounds. This will allow to propagate the chain length depending upon the requirement. Hence, the general reaction for the formation of polyester is shown below. The circle and rectangle specifies different moieties which imparts different characters to the polyester.

6 0

4 years ago

A buffer solution is prepared by adding NaC2H202

olganol [36]

Shift to reactants(left)

<h3>Further explanation </h3>

A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.

The buffer solution can be acidic or basic

Acid buffer solutions consist of weak acids and their salts.

A buffer solution of NaC2H202 and HC2H2O2 (acetic acid) is included in the acid buffer

So :

a slight addition of acid (H⁺) will be balanced by the conjugate base

the addition of a small base (OH⁻) will be balanced by the weak acid

With the addition of acid (H +), the equilibrium will shift to the left, in the formation of CH3COOH. The added acid will be neutralized by the conjugate base component (CH3COO−).

7 0

3 years ago

What does cp stand for in chemistry?

Evgesh-ka [11]

Cp is Constant Pressure

PS: Brainlist Answer plZ

4 0

3 years ago

Mass in grams of 4.26 mol Si

Whitepunk [10]

Answer:

119.28g

Explanation:

Data obtained from the question include:

Number of mole of Si = 4.26 mol

Molar Mass of Si = 28g/mol

Mass of Si =?

Number of mole = Mass /Molar Mass

Mass = number of mole x molar Mass

Mass of Si = 4.26 x 28

Mass of Si = 119.28g

6 0

4 years ago

Read 2 more answers

How many bonds are formed between 2 Hydrogen atoms in an H2 molecule?

exis [7]

<h3>Answer:</h3>

Have a strong polar attractions between molecule's involving H, F, O and N.

SUBMIT!

hope it helps

4 0

3 years ago