Capacity Definition and 664 Threads

just trying to get my head around heat capacity here for an experiment; if conducting a reaction in an adiabatic vessel, of which its material has a finite heat capacity, does this mean that if sufficient heat is produced within the vessel (through a chemical reaction), that the adiabatic...

I know that buffer capacity is defined as the ability of a buffer to resist pH change. I'm trying to calculate the buffer capacity of my buffer. I added NaOH to it until a significant change in pH, usually about 2 units. So when I calculate, should I do exp. buffer capacity = (moles NaOH /...

Dear all, I have no science back ground , I have purchased a 30KVA gas generator, for my farm house, I would like to know if I run it well below its capacity will it be harm full for the generator or it will get hot. It’s a American generator with cooling tower design, which I have converted...

hey for this question If a 2kg sample of aluminium absorbs 64.4 kJ of heat from its surrounds by how much does its temperature increase the answer is 65.1 how? i got 32.5 q=mcT T=q/mc=(64.6x10^3)/(2000x.9930) also same for this question If 0.5g of an organic compound is completely...

Homework Statement The molar heat capacity at a constant volume of a solid at low temperatures T << Td, where Td is the Debye temperature is given by: C_v = 464(\frac{T}{T_d})^3 Consider Td = 281 K for the NaCl. (a) Calculate the average molar heat capacity \bar{C_v} of the NaCl between...

Homework Statement 0.1kg of ice was added to a lemonade of mass 330g at an initial temperature of 28 degree celcius and it completely melted. Considering only the lemonade and ice cubes, calculate the final temperature of the lemonade. Given: specific latent heat of fusion of ice= 336000...

Just like the title, does battery capacity depend on internal resistance? I know it does depend on the temperature and the chemical structure of the battery, but does it also depend on internal resistance? If so, how dependent are batteries on internal resistance? Also, what is the...

For a system of distinguishable particles I am reading that at the limit of high temperatures, and at the limit of low temperatures the heat capacity with respect to constant volume, goes to zero. I've read that the reason for this is that at high temperatures, and low temperatures, the spacing...

a 210 heater is places in 2 kg of water. What temperature rise is produced if the heater is switched on for 200 seconds? I need your help please.

I am a IGCSE student! Ok so in the physics w08 qp ( http://www.xtremepapers.net/CIE/Cambridge%20IGCSE/0625%20-%20Physics/0625_w08_qp_03.pdf ) Qestion 5 c Using a 40 W heater, 16.3 g of ice is melted in 2.0 minutes. The heater is then switched off. In a further 2.0 minutes, 2.1 g of ice...

Homework Statement Find the quantity of thermal energy absorbed but the water in the calorimeter. Mass of metal sample:69.64g Water sample: Volume 190mL Temp: 24'C boiling water: 275mL temp of boiling water:90'C Sample in Calorimeter Initial Heat: 25'C 30 seconds: 26'C 60 seconds 26'C 90...

Homework Statement 6550 J of electrical heat is added to a constant pressure calorimeter containing 125 grams of water at 22.6 ◦C. If the final temperature of the calorimeter is 33.7 ◦C, the heat capacity of the calorimeter (including the water) is: Homework Equations I think it is...

Hello I do not remember the layout for posting and it is not posted because I'm on my mobile phone but I need help finding volume of hot water given the volume and temp of cold water and the temp of hot water. I need help finding specific heat given mass and temp and I...

A monatomic ideal gas undergoes a process in which the ratio of P to V at any instant is constant and equals to 1. What is the molar heat capacity of the gas? (A) 4R/2 (B) 3R/2 (C) 5R/2 (D) 0

Homework Statement Blood can carry excess energy from the interior to the surface of the body, where the energy is dispersed in a number of ways. While a person is exercising, 0.8 kg of blood flows to the surface of the body and releases 1300 J of energy. The blood arriving at the surface...

Homework Statement I heated 50mL of water in a Dewar and measured the temp. change with time. however, this only gives me the heat capacity of the system. I again measured but with 100mL of water, in an attempt to correct for the unknown heat capacity of everything but the water. However...

Homework Statement In order to find the specific heat capacity of an unknown material, a 50g piece is heated to 80 degrees Celsius and fully immersed in a well insulatyed calorimeter filled with 100g of water at 10 degrees Celsius raising the temperature of the water by 5 degrees, the heat...

Q. Thermal energy is supplied to a melting solid at a constant rate of 2000 W. Calculate the mass of the solid changed to liquid in 2.0 minutes. Assume that the specific latent heat of fusion of the solid is 95 000 J kg-1 and that heat exchange with the surroundings may be neglected. I was...

Homework Statement This is more of a conceptual question. I understand that the heat capacity ratio is basically the ratio between the heat capacity at constant pressure to the heat capacity at constant volume. I was asked to calculate the ratio of heat capacities for Nitrogen at two speeds...

Homework Statement The following data is obtained: Weight of ice cube added 20 g Weight of copper calorimeter 80.5 g Weight of water in calorimeter 105 g Initial temp of ice cube -18 deg C Initial temp of water 23 deg C Final temp of water 6 deg C Specific Heat Capacity copper 385 J...

A table gives the values of heat capacity at constant volume of pure germanium estimate its vibrational zero point energy. The vibrational zero point energy is just the missing 'area' in the plot of Cv vs T. I have plotted heat capacity versus T and calculated the zero point energy. What...

can you please state some liquid which is a good heat conductor (which have low specific heat capacity)

Homework Statement To summarize, I am given 6 objects and their corresponding specific heat capacity and thermal conductivity values. All objects have the same mass. The question is asking me to rank the objects based on temperature if they are put in a hot oven until they reach thermal...

Homework Statement Finding the specific heat capacity of an unknown metal. A cylinder was placed into boiling water, originally at 24.2 C. The heat transferred from the metal, and the water then was 29.5 C. Original Temperature-24.2 C Temperature after the metal has been placed into the...

A bath contains 110 litres of water where 1 litre has a mass of 1kg. a) Given that the specific heat capacity of water is 4200JKg-1K-1, calculate the energy required to raise the temperature of the water from 10'C to 40'C. b) As the water flows through the copper pipes, it is heated from...

"What is the specific heat capacity of a 50-gram piece of 100 degree C metal that will change 400 grams of 20 degrees C water to 22 degrees C? Could someone please explain to me how to do this problem? I have to figure it out on my own because my teacher is no help at all. Thanks in advance.

Calculate the heat capacity ratio for a diatomic ideal gas. ---- Using the equipartition theorem, I calculate: Cp / Cv = (Cv + R) / Cv = (7/2 R + R) / (7/2 R) = (9/2 R) / (7/2 R) = 9/7 ~ 1.286 According to the equipartition theorem, I assign each vibrational degree of freedom 1 R and...

Hi, I'm having difficulty with an assignment. Briefly, the question relates to a simply supported I beam containing a UDL and a point load. I've calculated the maximum bending moment resulting from these loads (neglecting beam mass) to be 5625kNm. I must select a universal beam from grade...

I am looking for a resistor that can dissipate a constant amount of heat at all temperatures immediately. I have been using some metal film/oxide resistors, but it takes a very long time before the resistor starts radiating heat. I think the material making up the resistor has such a high...

Homework Statement Quistions: 1-adding the same amount of heat to two samples does not produce the same increase in temperature. What physical parameters of hte bodies might be different? 2-We have a sample of metal with mass m. We supply an amount of heat Q and the temperature rises...

Homework Statement The specific heat of a certain metal can be determined by measuring the temperature change that occurs when a piece of the metal is heated and then placed in an insulated container that is made of the same material and contains water. Suppose the piece of metal has a mass of...

Hello, everyone. Homework Statement Now, I recently did an experiment in school to determine the Specific Heat Capacity of rubber using a calorimeter. We're using the mixing method to figure it out. The mass of the calorimeter, rubber and water was measured. And the S.H.C is already known...

Homework Statement Below about 80 K the heat capacity at constant volume for hydrogen gas (H2) is 3/2k per molecule, but at higher temperatures the heat capacity increases to 5/2k per molecule due to contributions from rotational energy states. Use these observations to estimate the distance...

Is it possible to find specific heat capacity given mass, initial and final temperature, and time? The liquid in question has not been given

1. The tangential frictional force exerted by a band brakes on a rotating metal drum of circumference 0.25m is found to be 20N. If the mass of the drum is 0.4kg and its specific heat capacity is 0.35 kJ/kg K, calculate the number of complete revolutions of the drum are required to increase its...

Hello everyone. I have a need concerning a project I'm building. I need to know, or need to know how to calculate the maximum uniform load on a single cantilever of A36 steel tube. It is solidly attached at one end and extends out 42". The material will be one of the following: 1) 2"x2"x 1/4"...

Homework Statement Calculate the standard enthalpy change (##\Delta H##) at 25 degrees Celsius and 927 degrees Cesius for the reaction, WCl4(g) + CH4(g) = WC(s) + 4HCl(g) Data: WCl4(g): ##\Delta H298## = -336 kJ/mole; Cp (heat capacity at constant pressure) = 105.6 J/mol*K HCl(g): ##\Delta...

Hi, I was woindering if anyone can help me on a problem I have been stuck on for a while now. I have an equation to combine the heat capcity of oil and water, but I can't find an equation anywhere that combines the heat capacities for water oil and gas. All i have is CpL =...

Hi, Can someone please give me some suggestions on how to use a microwave oven to determine the specific heat capacity of tap water? This is not a homework question, but an assignment and I have absolutely no idea how I can do this.This experiment will be done at home, so please no immersion...

Homework Statement Is it possible to convert ml to grams for a Heat Capacity and Specific Heat type of problem? The problems that I have done so far did not use ml at all. I am stuck with the following problem: A piece of stainless steel (specific heat = 0.50 J g-1 oC-1 ) is taken from an...

For a gas that obeys the equation of State P(v-b) = RT, where b is a constant, show that Cp is independent of Pressure, i.e., (\deltaCp/\deltap) at constant T is equal to zero Homework Equations Maxwell Relations H = U+PV dh = TdS + PdV dh/dT at constant P is defined as Cp The...

Homework Statement Why would vibrational and rotational degrees of freedom affect the heat capacity ratio more for N2 and CO2 than He or Ar? Would this occur at room temperatures? Homework Equations d.o.f.: 3N vibrational d.o.f., linear molecule: 3N - 5 nonlinear: 3N - 6 The...

Hi, I have some question about the full well capacity and dynamic range of the CCD camera. The following link lists some full well capacity and dynamic ragnes of some CCD cameras: http://www.andor.com/learning/digital_cameras/?docid=321 My question is how they obtain the electron numbers...

Homework Statement Derive the following expression for calculating the isothermal change in Constant Volume Heat Capacity: (dCv/dV)T = T(d2P/dT2)V Homework Equations The Attempt at a Solution I have no idea, please help

Homework Statement Lifts usually have signs indicating their maximum capacity. Consider a sign in a lift that reads “maximum capacity 1120kg or 16 persons”. Suppose that the weights of lift-users are normally distributed with a mean of 68kg and a standard deviation of 8kg. (a) What is the...

Homework Statement Make that specific heat capacity xD Well anyways, I did 5 trials trying to calculate the specific heat capacity of copper. I measured the temperature of metal, initial temperature of water, final temperature of water, calorimeter mass, mass of water etc. When I'm...

Homework Statement Plot the heat capacity as a function of temperature for aluminium, using the Einstein model. Homework Equations The Einstein model for heat capacity: The Attempt at a Solution The model assumes that the frequencies of all the harmonic oscillators in the material are...

Homework Statement A quantity of 100g of ice at 0°C and 50g steam at 100°C are added to a container that has 150g water at 30°C. What is the final temp of the container? Ignore the container itself in the calc. Homework Equations Q=mc (change in T) Q=mLThe Attempt at a Solution I know how to...

i found the average specific heat of a metal through an experiment it is 200. my only problem now is identifying it. i have tried many website but can't find anything useful please make some suggestions

Hi, I going to interface a microcontroller with SD flash memory card for data log. How to caculate the needed memory capacity? Thanks