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salantis [7]
3 years ago
14

Why do vinyl raincoats become brittle as they get old, even if they are not exposed to air or to any pollutants

Chemistry
1 answer:
Leto [7]3 years ago
6 0

Answer:

The substances made from polyvinyls are generally brittle and hard. This property prevails because the polymer strands present in the polyvinyls form a very regular and well-organized packing composition in the solid-state. The Van der Waals associations between the strands make the substance brittle. To make the substance soft and suitable to use as a raincoat, the incorporation of small molecules is done within the molten polymer before the hardening of the plastic.

These polymer strands act as plasticizers and prevent the strands of polymer from forming a hard and brittle conformation.

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Which statement is true regarding a catalyst?
Alla [95]

Answer:

d). A catalyst lowers the activation energy for a chemical reaction.

Explanation:

From the given choices, it is true that a catalyst lowers the activation energy for a chemical reaction.

The activation energy is the energy barrier that must be overcome before a chemical reaction can occur.

Some reactions have very high activation energy and would not occur without the introduction of a catalyst.

The catalyst brings the reactants into contact by removing the energy deficiency in the system.

4 0
3 years ago
In which media would light have the shortest wavelength ? ice ? glass ? water ? diamond
s2008m [1.1K]

Answer:

Diamond

Explanation:

As light moves from a less dense medium to a denser medium it slows down.

This is because the wave length of the light reduces. The denser the medium the less the wavelength. Diamond is the most dense solid among the provided choices thus light travelling through it has the least wavelength.

6 0
3 years ago
Read 2 more answers
What is Keq for the reaction N2 + 3H2 2NH3 if the equilibrium concentrations are [NH3] = 3 M, [N2] = 1 M, and [H2] = 2 M?
Licemer1 [7]

Answer : The correct option is, (D) k_{eq}=1.125

Explanation : Given,

Concentration of NH_3 = 3 M

Concentration of N_2 = 1 M

Concentration of H_2 = 2 M

The given balanced equilibrium reaction is,

N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)

The expression for equilibrium constant for this reaction will be,

K_{eq}=\frac{[NH_3]^2}{[N_2][H_2]^3}

Now put all the given values in this expression, we get the value of K_{eq}

K_{eq}=\frac{(3)^2}{(1)\times (2)^3}

K_{eq}=1.125

Therefore, the value of K_{eq} for the given reaction is, 1.125

5 0
3 years ago
Read 2 more answers
The teacher in item 10 also needs to order plastic tubing. If each of the 60 students need 750 mm of tubing, what length of tubi
Alex777 [14]

45 m. If each student needs 750 mm of tubing, the teacher should order 45 m of tubing.

a) Find the <em>length in millimetres</em>

Length = 60 students x (750 mm tubing/1 student) = 45 000 mm tubing

b) Convert <em>millimetres to metres </em>

Length = 45 000 mm tubing x (1 m tubing/1000 mm tubing) = 45 m tubing

6 0
3 years ago
Who was the first person to suggest the existence
katrin2010 [14]

Answer:

democritus is the first person

3 0
2 years ago
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