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3 years ago

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

Chemistry

1 answer:

AlladinOne [14]3 years ago

6 0

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.

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ASHA 777 [7]

Im sure the answer is c

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3 years ago

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Calculate the heat required to convert 10g of water at 100 c to steam at 100 c the specific heat of water is 1.00 cal the heat o

sladkih [1.3K]

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3 years ago

Determine the kinetic energy of an 833.0 kg roller coaster car moving at a speed of 20.0 m/s

trasher [3.6K]

Answer:

166,600J

Explanation:

Kinetic energy (K.E), which is the energy due to motion of a body, can be calculated by using the formula;

K.E = 1/2 × m × v²

Where;

K.E = kinetic energy (joules)

m = mass of body (kg)

v = speed or velocity (m/s)

According to this question, the mass of the roller coaster is 833.0 kg while its velocity/speed is 20.0m/s.

K.E = 1/2 × 833 × 20²

K.E = 1/2 × 833 × 400

K.E = 1/2 × 333200

K.E = 166,600

Therefore, the kinetic energy of the roller coaster car is 166,600J.

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2 years ago

CHEM PLZ HELP

marusya05 [52]

Answer:

Increase in CO2 (g) over time.

No NaHCO3 (s) will be left after a time

Explanation:

The reaction, shown below;

2NaHCO3(s) → Na2CO3(s)+CO2(g)+H2O(ℓ) is a decomposition reaction. A decomposition reaction is a kind of chemical reaction in which a given chemical specie breaks up to give other chemical species. Decomposition may be induced by heat or light.

Usually, there is only one reactant in a decomposition reaction; the specie that disintegrates into the products. This reactant usually decreases in concentration steadily because it is converted into products. This is why the mass of NaHCO3(s) in the system continues to decrease steadily until it finally falls to zero.

Conversely, the concentration (for aqueous) or volume (for gases) or mass (for solid) products of the reaction increases steadily as the reaction progresses. This explains why the volume of CO2 in the system will steadily increase over time.

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3 years ago

What affects the density of a substance? Select all that apply. Mass Gravity Volume Weight

Vlada [557]

Mass and Volume!

Hope this helps. :)

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2 years ago