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ivolga24 [154]
3 years ago
12

How would you prepare stable polymers from formaldehyde?

Chemistry
1 answer:
aliya0001 [1]3 years ago
8 0

Answer:

The mechanical properties of urea formaldehyde resins may be improved by incorporating therein polyvinyl alcohol. The polyvinyl alcohol may be incorporated during pre-mixing, mid mixing, and/or post mixing of the resin components. Resins prepared using polyvinyl alcohol are particularly desirable in articles requiring improved mechanical strength and water resistance, as compared to similar resins prepared without the polyvinyl alcohol such as shingles.

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A thermometer reads a pressure of 120 kPa at 0 ˚C. What is the temperature when the thermometer reads a pressure of 80 kPa? (Cel
Mariulka [41]

Answer:

T₂ = 182 K

Explanation:

Given that,

Initial pressure, P₁ = 120 kPa  

Initial temperature, T₁ = 0˚C = 273 K

We need to find the final temperature when the pressure is 80 kPa.

We know that, Gay Lussac's Formula is :

\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\\\\T_2=\dfrac{P_2T_1}{P_1}\\\\T_2=\dfrac{80\ kPa\times 273}{120\ kPa}\\\\T_2=182\ K

So, the new temperature is equal to 182 K.

4 0
3 years ago
Why is Sodium chloride a compound but not a molecule? I thought all the compounds are molecule but not all molecules are compoun
Firdavs [7]
Molecule is the general term used to describe any atoms that are connected by chemical bonds. Every combination of atoms is a molecule. A compound is a molecule made of atoms from different elements.
Well, if a molecule is considered to be a discrete small unit made up of atoms joined together, then NaCl, and any other ionic solid is not really a molecule. In NaCl we have a repetitive crystal structure in which each Na+ ion is surrounded by Cl- ions, and vice-versa, for as far as the crystal extends. There really isn't such a thing as an NaCl molecule.

8 0
3 years ago
Considering the combustion reaction of propane again, what mass of propane (C3Hg) is necessary to react with 4.53 g of oxygen? C
zimovet [89]

Answer:

1.25 g C3H8

Explanation:

edge lol

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2 years ago
Why do they call Cleveland "the mistake by the lake"?
algol13
Mostly because the lake smell really bad and the waters really dirty

3 0
4 years ago
When liquid water changes into solid ice, it increases in ?
kramer

when liquid water changes into solid ice, it increases in mass

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3 years ago
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