StudentShare solutions

# Thermodynamics Physics - Essay Example

## Extract of sample Thermodynamics Physics

Absolute zero results in a temperature of 0 Kelvins or -273.15° Celsius. 2) What is entropy? Explain why liquids are more disordered than solids and why gases are more disordered than liquids? (2 Marks) Ans: Entropy is the measure of the disorder or randomness of energy and matter in a system. The disorderliness of liquids and gases are caused by their particles which are more separated from each other compared to the molecules or particles of gases. 3) Predict whether entropy increases or decrease for the following reaction and explain why. (Do not calculate entropy): a. CaCO3(s) > CaO(s) + CO2(g) Ans: Increase b. N2(g) + 3H2(g) -2NH3(g) Ans: Decrease c. NH4NO3(s) > NH4+(aq) + NO3?(aq) Ans: Increase d. H2O(g) - H2O(l) Ans: Decrease (4 Marks) 4) Calculate ?S for the following reaction, using the thermodynamic data provided. Ans: ?S = S(products) – S(reactants) a. NaCl(s) > Na+(aq) + Cl?(aq) ?S = (51.2 + 223.5 ) – (72.1) = 202.6 kJ/mol b. 2NO(g)+O2(g) > N2O4(g), ?S = (219.9) – [2(211.2) + 205.1] = -407.6 kJ/mol c. CH4(g) + 2O2(g) > CO2(g) + 2H2O(l). ?S = [213.7 + 2(69.9)] – [186.3 + 2(205.1)] = -243 kJ/mol d. ...
The temperature of a system rises by 45°C during a heating process. Express this rise in temperature in Kelvins. Ans: °Kelvin = °Celsius + 273 = 45°C + 273 = 318°C d. The temperature of a system rises by 180°F during a heating process. Express this rise in temperature in R, K and °C. Ans: 180°F = 82.22°C = 355.22°K = 639°R 6) The mass flow rate is 4kg/s, the heat of combustion for C3H8 is 46 450kJ/kg. Determine the heat release rate. (1 Mark) Ans: Heat release rate = heat of combustion * mass flow rate = 46 450 * 4 = 185800 kJ/s 7) What is Fourier’s Law? Mathematically express Fouriers Law defining all the terms used within it. What is thermal conductivity? Compare the values of thermal conductivity of metals, insulating materials and gases. Why does Fourier's law have a minus sign? (8 Marks) Ans: Heat flow, dQ/dt, through a homogeneous solid is directly proportional to the area, A, of the section at right angles to the direction of heat flow, and to the temperature difference along the path of heat flow. Mathematically, where dQ/dt = heat flow rate; A = area of the section; dT/dx = rate of change of temperature along the path of the heat flow; ? = proportionality constant 8) Explain the Stefen-Boltzman Law. What is emissivity? What are the range of values for the emissivity of a surface? Define the terms “black surface” and “grey surface”. What role does the view factor play in determining the rate of heat transfer? What is a blackbody? (8 Marks) Ans: The Stefen-Boltzman Law states that “[in a black body], the emissive radiations or radiating heat flux is proportional to the 4th power of temperature on the absolute scale (Kelvin).” This means that for every Kelvin degree increase in temperature of a black body, ...Show more

## Summary

University of Central Lancashire School of forensic and Investigative Sciences FV1201: Energy Transfer and Thermodynamics Assignment 1 2011 – 2012 1) Define the four laws of thermodynamics using words, diagrams and equations where appropriate. (6 Marks) Ans: Zeroth Law: Two systems in thermal equilibrium with a third are in thermal equilibrium with each other…
Author : ghudson
Save Your Time for More Important Things
Let us write or edit the essay on your topic
"Thermodynamics Physics Essay"
with a personal 20% discount.
Grab the best paper

### Check these samples - they also fit your topic

Physics
1. Estimate the amount of heat wasted on each mile from a typical car (30 MPG) Heat from any automobile is produced by burning of oxygen. The gas that is produced is carbon dioxide that is usually a product of combustion. Although there are other by-products of combustion, the main by-product is carbon dioxide (CO2).
5 pages (1250 words) Essay
Physics
2. When jumping from a tree to the ground, the person moves at constant acceleration hence constant force. On hitting the ground, the person experiences an opposing force from the ground causing the body to lose momentum within a short time interval, hence need for more force leading to pain.
3 pages (750 words) Essay
Physics
These questions have been responded to in a certain chronological order as follow. Frequencies encoding gradients, as well as phase encoding gradients areboth essential part of the spatially encoded data. It is, thus, true that using the induced differences in the frequency and the phase of precession, makes the data amenable for analysis by the Fourier transform.
4 pages (1000 words) Essay
Thermodynamics and Information Theory
Shannon, In the beginning Shannon was not initially aware of this similarity, and later commented on it upon publicizing information theory in A Mathematical Theory of Communication. In my paper I will explores what links there are between the two different concepts, and how far they can be regarded as connected in practical and theory.
2 pages (500 words) Essay
Physics
But it gained an independent identity in 19th century. New discoveries constantly open new outlook for learning about nature. It is a way of looking at nature from the ground up, and has inspired the philosophies of the twentieth century. Today, the scope of physics is expanding through inter-relationship between various concepts like mechanics, heat, sound, light, electricity and magnetism leading to new fields including microbiology, nano- technologies and financial markets
5 pages (1250 words) Essay
Physics Essay
the potential at a point on the surface due to the charge is Q/R. since potential inside a conductor is the same everywhere, this expression itself gives the potential of any point in the interior of the sphere. But the potential of a conductor is Q/C where C is the capacitance.
7 pages (1750 words) Essay
Essay questions in Biology
(2) Arguments For How The Theory of Natural Selection (a) Violates the Thermodynamics Laws and (b) Does Not Violate the Thermodynamic Laws . (3) Explaining How Life Works at the Chemical Level. 9 Question 7- (1) Similarities in the ideas of Lamarck and
5 pages (1250 words) Essay
Thermodynamics Paper
In addition to this paper illustrating the phase diagrams, it will go deeper into evaluating all the possible phase changes that this pure substance can make at atmospheric pressure. Lastly, the paper will discuss the Common applications of these phase changes. Phase
2 pages (500 words) Essay
Thermodynamics
Quality may have values between 0 (saturated liquid) and 1 (saturated vapour). It has no meaning in the compressed liquid or superheated vapour regions. In the saturated mixture region, the average value of
8 pages (2000 words) Essay
Physics
Walter Brattain, Gerald Pearson who was a physicist, Robert Gibney who was a chemist and Hilbert Moore who was an expert in electronics among others were also members of the group. Their aim was to find a state solid alternative to amplifiers that were made of fragile
2 pages (500 words) Essay
Hire a pro to write