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3 years ago

Which of the following statements about ethylene and polyethylene is true?

Chemistry

1 answer:

Aloiza [94]3 years ago

6 0

Answer:

D is the correct option.

Explanation:

The structure of ethene/ethyelene is : $H_{2}$ C==C $H_{2}$

The carbon atoms are bonded together by a double bond.

The structure of polyethylene/polythene is: (- $H_{2}$ C-C $H_{2}$ - $)_{n}$

The carbon atoms are bonded together by single bonds.

Lets analyse each option:

A) Its false. Lets look at the obvious: Ethylene is a gas and polyethylene is a solid. Monomers and polymers have very different properties.

B) Its false. Polyethylene doesnt have double bonds.

C) False as well. Polyethylene doesnt have double bonds.

D) True. It is evident from the structure of the the monomer and polymer that I've shown above. I'll also provide neat structures in the attachments.

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During the combustion of a peanut that weighed 0.341 g, the temperature of the 100 mL of water in the calorimeter rose from 23.4

blondinia [14]

Answer:

119 kCal per serving.

Explanation:

The heat energy necessary to elevates water's temperature from 23.4°C to 37.9°C can be calculated by the equation below:

Q = mcΔT

Q: heat energy

m: mass in g

c: specific heat capacity in cal/g°C

ΔT = temperature variation in °C

m is the mass of water, considering the density of water to be 1g/mL, 100 mL of water weights 100g. Therefore:

Q = 100 g x 1.00 cal/g°C x (37.9 - 23.4)°C

Q = 1450 cal

1450 cal ____ 0.341 g peanuts

x ____ 28 g peanuts

x = 119061.58 cal

This means that the cal from fat per serving of peanuts is at least 119 kCal.

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Andrej [43]

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Oduvanchick [21]

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Inessa [10]

Answer:

B. temperature decreases as altitude increases.

Explanation:

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