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3 years ago

What is the overall energy transformation in a coal-fired power plant?.

1 answer:

7 0

Answer: When coal is burned, chemical potential energy is transformed into thermal energy, light energy, and sound energy. Only the thermal energy is used for electricity production. Light and sound energy dissipate into the environment, immediately reducing efficiency.

Hope this helps.

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Why for thousand of years people believed that stars moved across earth sky

Rzqust [24]

Because they did not have the proper technology. Hope my answer was useful.

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3 years ago

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What pressure (in atm) will 0.44 moles of co2 exert in a 2.6 l container at 25Â°c?

Lilit [14]

We can use the ideal gas law equation to find the pressure
PV = nRTwhere
P - pressure
V - volume - 2.6 x 10⁻³ m³
n - number of moles - 0.44 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 25 °C + 273 = 298 K
substituting the values into the equation,
P x 2.6 x 10⁻³ m³ = 0.44 mol x 8.314 Jmol⁻¹K⁻¹ x 298 K
P = 419 281.41 Pa
101 325 Pa is equivalent to 1 atm
Therefore 419 281.41 Pa - 1/ 101 325 x 419 281.41 = 4.13 atm
Pressure is 4.13 atm

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3 years ago

In a chemical reaction, __________ are the substances present after the reaction.

chubhunter [2.5K]

Answer:

products

Explanation:

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3 years ago

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Classify each of the four compounds as a conjugated, isolated, or cumulated diene. Compound A: Two alkenes are joined by a sigma

Lina20 [59]

Explanation:

Conjugated diene is the one that contains alternate double bonds in its structure. That means both the double bonds are separated by a single bond.

Cumulated diene is the one that contains two double bonds on a single atom. This means it has two double bonds continuously.

Isolated double-bonded compound has a single bond isolated by two to three single bonds.

Compound A: Two alkenes are joined by a sigma bond.

For example:

$-CH_2=CH-CH=CH2-$

It is a conjugated diene.

Compound B: Two alkenes are joined by a C H 2 group.

It is a cumulative diene.

Compound C: Two alkenes are joined by C H 2 C H 2.

Then it is an isolated alkene.

Compound D: A cyclohexene has a double bond between carbons 1 and 2. Carbon 3 is an sp 2 carbon that is bonded to another s p 2 carbon with an alkyl substituent.

Hence, compound D is a conjugated diene.

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3 years ago

What type of heat transfer is an ice cube inside of a hot soup

ch4aika [34]

Answer: Conduction

Explanation:

Because the ice cube is touching the surrounding soup, the energy is going from the hot soup into the ice cube. You can rule out radiation and convection because radiation includes rays (which aren't a part of this question) and convection is usually seen in objects/fluids that are not touching (and the ice cube and the soup ARE touching).

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3 years ago

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