1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
MrRissso [65]
3 years ago
10

A cylinder and piston assembly (defined as the system) is warmed by an external flame. The contents of the cylinder expand, doin

g work on the surroundings by pushing the piston outward against the external pressure. If the system absorbs 551 J of heat and does 478 J of work during the expansion, what is the value of ΔE?
Chemistry
1 answer:
melomori [17]3 years ago
3 0

Answer:

ΔE = 73 J

Explanation:

By the first law of thermodynamics, the energy in the system must conserved:

ΔE = Q - W

Where ΔE is the internal energy, Q is the heat flow (positive if it's absorbed by the system, and negative if the system loses heat), and W is the work (positive if the system is expanding, and negative if the system is compressing).

So, Q = + 551 J, and W = + 478 J

ΔE = 551 - 478

ΔE = 73 J

You might be interested in
How cold does it have to be for boiling water to freeze instantly
scZoUnD [109]

Answer:

Below 0° degrees Celcius

Explanation:

For deposition (gas to solid) to happen, the temperature has to be below 0° Celsius. If so, deposition occurs, and ice crystals form.

3 0
2 years ago
As a distant star moves away from earth, the light given off by the star has a
Troyanec [42]

Answer:

The wavelength of these photons will become longer. The energy of each of these photons will become lower.

Explanation:

<h3>Wavelength</h3>

Light can be considered as electromagnetic waves. The wavelength of a wave is equal to the minimum distance between two troughs (lowest points) in this wave. On the other hand, the frequency of a wave is equal to the number of wavelengths that this wave travels in unit time.

Assume that the speed of light stays the same. The distance that this beam of light travels in unit time will be the same. However, with a lower frequency, there would be fewer wavelengths in that same distance. Therefore, the size of each wavelength will become longer.

If c represent the speed of light and f represents the frequency, then the wavelength would be:

\displaystyle \lambda = \frac{c}{f}.

<h3>Energy</h3>

The energy E of each proton of a beam of light is proportional to the frequency f of the light. Let h denote Planck's Constant. The numerical relation between E\! and f\! would be:

E = h\, f.

Therefore, if the frequency f of this light becomes smaller, the energy E of each of its proton will also become proportionally lower.

5 0
4 years ago
Why is atomic mass measured in atomic mass units (amu)?
xenn [34]

Answer:

A

Explanation:

Protons and neutrons make up nearly all the mass of an atom, and each is worth 1 amu. Each atom of an element has a mass measured in amu; thus, its weighted average, or atomic mass, is measured in amu.

Electrons are way way way....lighter so protons and neutrons are taken into account when doing atomic mass.

8 0
3 years ago
Read 2 more answers
Which of the following is not a postulate of the kinetic-molecular theory? A. Gas particles have a high force of attraction to o
PolarNik [594]
<span>Following are important postulates of Kinetic theory of gases

1) Gases are made up of number of particles. 
this particles  behaves like hard and spherical objects, which are in constant state of motion.
2)  The particles always travel in a straight line until they collide with another particle or the walls of the container.
3) Particles are of smaller size as compared to the distance between particles.
4) There exist minimal/no force of attraction between the gas particles neither there exist attractive interaction between the particles and the walls of the container.
5) Collisions between gas particles or with the walls of the container are  elastic in nature. 

Thus, statement a i.e. </span><span>Gas particles have a high force of attraction to one another or to the walls of the container contradicts the postulates of kinetic theory of gases</span>
3 0
3 years ago
Read 2 more answers
What happens to crayons when heated?
Olin [163]

they become liquified

3 0
3 years ago
Other questions:
  • Calculate the number of joules released when 72.5 grams of water at 95 degrees Celsius to a final temperature of 28 degrees Cels
    14·1 answer
  • The process by which water falls to earth as rain,snow,hail,or sleet is called what
    5·1 answer
  • You need to write the formula. however, do not worry about trying to make the numbers smaller or as subscripts. h2o would be how
    15·1 answer
  • Copper occurs in nature in the form of two isotopes, Cu-63 and Cu-65. Its correctly recorded atomic mass (weighted average) is 6
    11·1 answer
  • Which part of the experiment is not touched by the independent variable or is the normal/comparison
    14·1 answer
  • Fire ants in the southeastern United States were accidentally introduced over seventy years ago. Stings from fire ants can be de
    14·1 answer
  • Q2.
    6·1 answer
  • If 150 G of wood started Burning, and 30 G of wood ash was left behind, how many grams of CO2 to gas was released
    15·1 answer
  • Element X has a charge of +2 and Element Y has a charge of -1.
    11·1 answer
  • Which of the following is the smallest atom? Why? Al Si P
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!