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Delvig [45]
3 years ago
15

In the first law of thermodynamics, angle E = Q - W, what does Angle E stand for?

Chemistry
2 answers:
Rudik [331]3 years ago
8 0
I guess my answer got deleted for some reason so here it is again, Angle E stands for the change in the internal energy(E standing for energy) of the system so D.
In whole this equation can be written down as, the change in the internal energy of the closed system, equal too the heat added to the system, minus the work done by the system.
soldier1979 [14.2K]3 years ago
8 0

Answer:

D

Explanation:

trust me ;)

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The following boiling points correspond to the substances listed. Match the boiling points to the substances by considering the
Julli [10]

Answer:

CH₄                                - 162 ⁸C

CH₃CH₃                          -88.5 ⁸C

(CH₃)₂ CHCH₂CH₃         28 ⁸C

CH₃3(CH2)₃CH₃             36 ⁸C

CH₃OH                           64.5 ⁸C

CH₃CH₂OH                     78.3 ⁸C

CH₃CHOHCH₃                82.5 ⁸C

C₅H₉OH                         140 ⁸C

C₆H₅CH₂OH                   205 ⁸C

HOCH₂CHOHCH₂OH    290 ⁸C

Explanation:

To answer this question we need first to understand that for organic compounds:

a. Non polar compounds have lower boiling points than polar ones of similar structure and molecular weight.

b. Boiling points increase with molecular weight.  In alkane compounds if we compare  isomers, the  straight chain isomer will have a higher boiling point than the branched one (s) because of London dispersion intermolecular forces.

a. The introduction of hydroxyl groups increase the intermolecular forces and hence the boiling points because the electronegative oxygen, and, more importantly the presence  of hydrogen bonds.

Considering the observations above, we can match the boiling points as follows:

CH₄                                - 162 ⁸C

CH₃CH₃                          -88.5 ⁸C

(CH₃)₂ CHCH₂CH₃         28 ⁸C

CH₃3(CH2)₃CH₃             36 ⁸C

CH₃OH                           64.5 ⁸C

CH₃CH₂OH                     78.3 ⁸C

CH₃CHOHCH₃                82.5 ⁸C

C₅H₉OH                         140 ⁸C

C₆H₅CH₂OH                   205 ⁸C

HOCH₂CHOHCH₂OH    290 ⁸C

Note: There was a mistake in the symbols used for the  162 and 88.5 values which are negative and correspond to the common gases methane and ethane

7 0
3 years ago
2ch4(g) c2h2(g) 3h2(g) describe what is happening within the system when it is at equilibrium in terms of concentrations, reacti
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2) At equilibrium, both the forward and reverse reactions are still occurring.

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Answer:

independent- test variable

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A person of 82 kg is in an elevator. If the elevator is moving at a speed of 5m/s, what’s the person’s kinetic energy.
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Answer:

The person’s kinetic energy is 1,025 J

Explanation:

Kinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and in a position of rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.

Kinetic energy is represented by the following formula:

Ec=\frac{1}{2}*m*v^{2}

where Ec is kinetic energy, which is measured in Joules (J), m is mass measured in kilograms (kg), and v is velocity measured in meters over seconds (m/s).

In this case:

  • Ec= ?
  • m= 82 kg
  • v= 5 \frac{m}{s}

Replacing:

Ec=\frac{1}{2}*82 kg*(5\frac{m}{s} )^{2}

Solving:

Ec= 1,025 J

<u><em>The person’s kinetic energy is 1,025 J</em></u>

3 0
3 years ago
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