CHEMISTRY HIGH SCHOOL

If a system has 2.00 × 10 2 kcal 2.00×102 kcal of work done to it, and releases 5.00 × 10 2 kJ 5.00×102 kJ of heat into its surroundings, what is the change in internal energy of the system?

Answers

Answer 1
Answer:

Answer:

336.8 kilo Joules is the change in internal energy of the system.

Explanation:

The equation for first law of thermodynamics follows:

where,

Q = heat added to the system

ΔU = Change in internal energy

W = work done

We have :

Amount of heat given out by the system will be negatuive as heat relased by the system = Q

Q=

Work done on the system will positive as work is done on the system:

w =

336.8 kilo Joules is the change in internal energy of the system.


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The equilibrium constant for the reaction pcl3(g) + cl2(g) ⇀↽ pcl5(g) is 35000 at 760 ◦c. at equilibrium, the partial pressure of pcl5 was 190 bar and that of pcl3 was 9.76 bar. calculate the equilibrium partial pressure of cl2. answer in units of bar

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MIDDLE SCHOOL

Example when materials are prepared as fluids so they can be moved more easily

Answers

A simple, albeit slightly less useful example perhaps, is when a foundry, or individual metalworker, liquefies metal such as iron, aluminum, or steel so that it can be mixed in with specific forging agents or transferred around a workplace. 

In general solids are easier to transport than liquids, but the above metal example is a valid one and the only other one that comes to mind is that of concrete. It is mixed as a liquid and transported as such, but then sprayed or laid down to dry and form a solid surface or filler.  
A simple, albeit slightly less useful example perhaps, is when a foundry, or individual metalworker, liquefies metal such as iron, aluminium, or steel so that it can be mixed in with specific forging agents or transferred around a workplace. 
In general, solids are easier to transport than liquids, but the above metal example is a valid one and the only other one that comes to mind is that of concrete. It is mixed as a liquid and transported as such, but then sprayed or laid down to dry and form a solid surface or filler.  
Explanation:

Both gases and liquids are fluids, therefore technically, the gas to liquid stuff does not work. 

In addition to the LN2 and LO2 the opposite guys mention, organic compound gases also are oftentimes created into liquids. LPG is of a composition that it liquefies at low pressures. LNG is gas that's terribly cold in order that it becomes a liquid in order that tons are shipped during a tanker. 

Industrial users additionally build solids into liquids for transport in pipelines. as an example, coal slurries area unit typically used. Coal is ground up into the mud, and mixed with water, and may then be pumped up through pipelines. There are different sorts of slurries, like wood chips/water in paper mills, sand/water mixture in dredging machines.
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A railroad diesel engine weighs four times as much as a freight car. The diesel engine coasts at 5 km/h into a freight car that is initially at rest. Use the conservation of momentum to show that after they couple together, the engine + car coast at 4 km/h. Please show work!!!! step by step

Answers

Explanation:

Conservation of momentum :

Where :

= masses of object collided

= initial velocity before collision

= final velocity after collision

We have :

Mass of an engine =

Mass of an car=

Initial velocity of railroad engine

Initial velocity of car (rest)

Final velocity of  railroad engine (same direction )

Final velocity of car (same direction)

v = 4 km/h

The speed of the engine and car after they coupled together is 4 km/h.

HIGH SCHOOL

a family consumes 2.5 gallons of milk per week. how many liters of milk do they need to buy for 1 week?

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HIGH SCHOOL

How many 100 mg tetracycline capsules can be made from 1 kg of tetracycline? (A) 10
(B) 100
(C) 1,000
(D) 10,000
(E) 100,000

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1mg=10-3g
100mg=0.1g

1kg=1000g
=1000/0.1
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COLLEGE

Which compounds are lewis bases? select all that apply. h―c≡c―h h− nh3 ch3ch2ch3?

Answers

are Lewis bases.

What are Lewis bases?

In this, the electron should be donated with respect to an acceptor. These electrons could be pair of electrons. It could be in the form of lone pair, a negative charge or electrons in a -bond.

In  , the presence of -bond makes and refers Lewis base.

In , the presence of a negative charge makes and refers  Lewis base.

In , the presence of lone pair on nitrogen makes and refers Lewis base.

Learn more about lewis bases here: brainly.com/question/15220646?referrer=searchResults

The Lewis bases are those which can donate electron pair to an acceptor. These electrons can be a pair of electron that is a lone pair, a negative charge or electrons in a -bond.

  • In , the presence of -bond make it a Lewis base.
  • In , the presence of negative charge makes it a Lewis base.
  • In , the presence of lone pair on nitrogen makes it a Lewis base.
  • In , there is no lone pair, no -bond, no negative charge so it is not a Lewis base.

Hence, , , and are Lewis bases.

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During nuclear reactions some mass might be converted into energy and some energy might be converted into mass

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Which of the following pieces of laboratory equipment is not directly used to make measurements? a. test tube
b. graduated cylinder
c. ruler
d. thermometer

Answers

The correct answer is A. Test tube
Because all the others are directly used to make measurements
a. test tube is the answer

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Is it possible to distinguish kc from kp by comparing the units used to express the equilibrium constnat?

Answers

Yes, it is possible to distinguish Kc from Kp.
Kc is defined by molar concentrations, whereas Kp is defined by the partial pressures of the gasses inside a closed system, so units is different.
For Kc will be (mol/dm³)ˣ or (mol/L)ˣ and for Kp will be Paˣ, atmˣ or torrˣ.
Kc = Kp·R·T.
R - gas constant.
T - temperature.
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