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3 years ago

What are the uses of polythene?

2 answers:

Crank3 years ago

7 0

Polyethylene is synthesized from ethylene which is a compound derived from natural gas or petroleum. It’s essentially a thermoplastic, implying that it can be molten and remolded into the desired shape making it reusable and cost-effective. Of all the different kinds of plastics produced around the world, polyethylene is the most common and significant.

Polyethylene is manufactured in three different forms namely:

Low Density Polyethylene (LDPE),High Density Polyethylene (HDPE) andLinear Low Density Polyethylene (LLDPE),

Each of these three plastics has different applications ranging from containers, packaging and films to buckets and bottles.

Hope it helps you...

Mama L [17]3 years ago

4 0

Polythene is used for mostly plastic. It’s primary use is for packaging mainly to make (plastic bags, plastic films, geomembranes)

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Using the data: C2H4(g), = +51.9 kJ mol-1, S° = 219.8 J mol-1 K-1 CO2(g), = ‑394 kJ mol-1, S° = 213.6 J mol-1 K-1 H2O(l), = ‑286

ra1l [238]

Answer:

The correct answer is 1332 KJ.

Explanation:

Based on the given information,

ΔH°f of C2H4 is 51.9 KJ/mol, ΔH°O2 is 0.0 KJ/mol, ΔH°f of CO2 is -394 KJ/mol, and ΔH°f of H2O is -286 KJ/mol.

Now the balanced equation is:

C2H4 (g) + 3O2 (g) ⇔ 2CO2 (g) + 2H2O (l)

ΔH°rxn = 2 × ΔH°f CO2 + 2 × ΔH°fH2O - 1 × ΔH°fC2H4 - 3×ΔH°fO2

ΔH°rxn = 2 (-394) + 2(-286) - 1(51.9) - 3(0)

ΔH°rxn = -1411.9 KJ

Now, the given ΔS°f of C2H4 is 219.8 J/mol.K, ΔS°f of O2 is 205 J/mol.K, ΔS°f of CO2 is 213.6 J/mol.K, and ΔS°f of H2O is 69.96 J/mol.K.

Now based on the balanced chemical reaction,

ΔS°rxn = 2 × ΔS°fCO2 + 2 ΔS°fH2O - 1 × ΔS°f C2H4 - 3 ΔS°fO2

ΔS°rxn = 2 (213.6) + 2(69.96) - 1(219.8) -3(205)

ΔS°rxn = -267.68 J/K or -0.26768 KJ/K

T = 25 °C or 298 K

Now putting the values of ΔH, ΔS and T in the equation ΔG = ΔH-TΔS, we get

ΔG = -1411.9 - 298.0 × (-0.2677)

ΔG = -1332 KJ.

Thus, the maximum work, which can obtained is 1332 kJ.

6 0

3 years ago

2Fe(s) + O2(g) → 2FeO(s)<br><br><br> To which category does this reaction belong?

Varvara68 [4.7K]

Answer:

Redox reactions

Explanation:

Redox reactions consists of both oxidation and reduction

one species gets oxidised and other species become reduced, both oxidation and reduction happen simultaneously

reduction is either gain of electrons or gain of hydrogen. in reduction the oxidation number of species reduces

in this reaction the reduction half equation is

O₂ + 4e --> 2O²⁻

oxidation is either loss of electrons or gain of oxygen. in oxidation the oxidation number of species increases.

Fe --> Fe²⁺ + 2e

since both these half reactions happen overall its a redox reaction

6 0

3 years ago

The study of how organisms interact with one another and with their environment

Brums [2.3K]

The study of how organisms interact with one another and with their environment is ecology

4 0

3 years ago

If ethanol has a density of 0.785g/mL, calculate the volume of 83.7 g of ethanol.

ratelena [41]

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question

mass = 83.7 g

density = 0.785 g/mL

We have

$volume = \frac{83.7}{0.785} \\ = 106.62420$

We have the final answer as

Hope this helps you

8 0

3 years ago

Which of the following describes an exothermic reaction?

Pavel [41]

Answer:

The answer to your question is: letter A

Explanation:

a) A + B ⇒ AB + heat It is an exothermic reaction because heat is released.

b) A + BΔ ⇒ AB It heat added to the reactants , then it is an endothermic reaction.

c) heat + BC ⇒ B + C It's an endothermic reaction because heat is added to the reactants.

d) B + heat + CD ⇒ BD + C It's and endothermic reaction because heat is added to the reactants.

6 0

4 years ago

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