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nlexa [21]
3 years ago
12

A student writes the following explanation of how one type of compound is formed.

Chemistry
1 answer:
enyata [817]3 years ago
6 0

Answer:

<u>Polymerization process(Addition)</u>

Explanation:

<u>Polymerization </u>: The process in which small units called monomers combine to produce large mass compound is called polymerization reaction.These large masses are also called macromolecules.

The formation of polymers can occur by addition or condensation process .

<u><em>Addition</em></u> : In addition reaction small units add to previous units

<em><u>Condensation</u></em> : In condensation , a small molecule like water , carbon dioxide get eliminated when the unit attach to previous unit.

Some natural polymers are Proteins , carbohydrates , lipids , cellulose.

Polythene = addition polymerisation also known as Chain growth polymerisation.

nCH_{2}=CH_{2}\rightarrow (-CH_{2}CH_{2}-)_{n}

This occur in three steps:

1. Chain Initiation : The start of the reaction occurs with the radical. These are generated from some organic peroxide and have general representation:

R^{.}

2 . Chain Growth = When the small units goes on adding to the previous units , Chain length increases and this is called chain growth.

3. Chain Termination = The chain continues to grow more and more until not forced to stop. This termination of chain growth is called chain termination

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Calculate the pH of a 0.50 M HIO. The Ka of hypoiodic acid, HIO, is 2.3x10–11.0.305.325.479.474.80
never [62]

Answer:

pH = 5.47

Explanation:

The equilibrium that takes place is:

HIO ↔ H⁺ + IO⁻

Ka = \frac{[H+][IO-]}{[HIO]} = 2.3 * 10⁻¹¹

At equilibrium:

  • [HIO] = 0.5 M - x
  • [H⁺] = x
  • [IO⁻] = x

<u>Replacing those values in the equation for Ka and solving for x:</u>

Ka=\frac{x^2}{0.5-x}=2.3*10^{-11} \\x^2=(2.3*10^{-11})(0.5-x)\\x^2=1.15*10^{-11}-2.3*10^{-11}x\\x^2+2.3*10^{-11}x-1.15*10^{-11}=0\\x=3.39*10^{-6}

Then [H⁺]=3.39 * 10⁻⁶, thus pH = 5.47

7 0
3 years ago
The following information is given for benzene, C6H6, at 1atm: boiling point = 80.1 °C Hvap(80.1 °C) = 30.7 kJ/mol specific heat
user100 [1]

<u>Answer:</u> The heat required for the process is 4.24 kJ

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass of benzene = 24.8 g

Molar mass of benzene = 78.11 g/mol

Putting values in above equation, we get:

\text{Moles of benzene}=\frac{24.8g}{78.11g/mol}=0.318mol

To calculate the enthalpy change of the reaction, we use the equation:

\Delta H_{rxn}=\frac{q}{n}

where,

q = amount of heat absorbed = ?

n = number of moles = 0.318 moles

\Delta H_{rxn} = enthalpy change of the reaction  = 30.7 kJ/mol

Putting values in above equation, we get:

30.7kJ/mol=\frac{q}{0.318mol}\\\\q=(30.7kJ/mol\times 0.318mol)=4.24kJ

Hence, the heat required for the process is 4.24 kJ

6 0
3 years ago
How does the appearance of a substance change when it<br> changes phase?
kicyunya [14]

Answer:

Melting: the substance changes back from the solid to the liquid. Condensation: the substance changes from a gas to a liquid. Vaporization: the substance changes from a liquid to a gas. Sublimation: the substance changes directly from a solid to a gas without going through the liquid phase.

Explanation:

6 0
3 years ago
How many moles is 2.2 x 1023 atoms of Fe?
kow [346]

Answer:

it's 3.77 moles

Explanation:

Pls give brainliest :)

4 0
3 years ago
14 points!!! Pls tell me answer :3
iren [92.7K]
I’d say the last one
8 0
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