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lisabon 2012 [21]
2 years ago
15

State two types of plastics and their uses.​

Chemistry
2 answers:
Svetllana [295]2 years ago
7 0

Thermoplastic and thermosetting

thermoplastic:- they are easily molded and extruded into films, fibres and packaging.For eg. PVC

thermosetting:-they are hard and durable and can be used for aircraft parts,tires and auto parts .For eg. phenolic resins.

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Maru [420]2 years ago
5 0

Answer:

The two types of plastic are:

1. thermosets (cannot be melted)

2. thermoplastics (can be melted)

Explanation:

<u>Thermoplastics</u>

<em>Thermoplastics such as polyethylene and polystyrene are capable of being molded and remolded repeatedly.</em>

Thermoplastics can be recycled. They are further of two types:

1. Amorphous (polystyrene, polycarbonate etc.)

2. Semi-Crystalline (PET, nylon etc.)

<u>Thermosets</u>

<em>Thermoset is a material that strengthens when heated, but cannot be remolded or heated after the initial forming.</em>

Thermosets can't be recycled.

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Calculate the molarity of an HCl solution if 23.88 mL of it reacts with 6.5287 grams of sodium carbonate (106 g/mol) according t
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Answer:

5.158 mol/L

Explanation:

To find the molarity, you need to use the formula:

Molarity (M) = moles / volume (L)

You have been grams sodium carbonate. You need to (1) convert grams Na₂CO₃ to moles (via molar mass), then (2) convert moles Na₂CO₃ to moles HCl (via mole-to-mole ratio from equation), then (3) convert mL to L (by dividing by 1,000), and then (4) use the molarity equation.

<u>Steps 1 - 2:</u>

2 HCl + 1 Na₂CO₃ ----> 2 NaCl + H₂O + CO₂

6.5287 g Na₂CO₃         1 mole            2 moles HCl
--------------------------  x  -------------  x  -------------------------  =  0.12318 mole HCl
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<u>Step 3:</u>

23.88 mL / 1,000 = 0.02388 L

<u>Step 4:</u>

Molarity = moles / volume

Molarity = 0.12318 mole / 0.02388 L

Molarity = 5.158 mole/L

**mole/L is equal to M**

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