Of the following, a molecule is best described as. But opting out of some of these cookies may have an effect on your browsing experience. Its value depends on internal structure of molecules that make the substance. When an additional gram of air is pumped into the container and there is no change in temperature, the new pressure is, The pressure on 100 liters of helium is increased from 100 kPa to 400 kPa. Necessary cookies are absolutely essential for the website to function properly. Specific Heat The speed of the ax head when it strikes the tree is, A 1-kg object is moving at 10 m/s. The balls speed is 8 m/s when it has gone 4 m. The magnitude of the force is, The 2.5-kg head of an ax exerts a force of 80 kN as it penetrates 18 mm into the truck of a tree. Still have questions? This value of the heat required to raise the temperature of a single gram of any substance is either measured at constant volume or constant pressure. One of the many parameters which come into play when using metals and compounds in manufacturing and chemical research, is the specific heat capacity. If the samples all have the same volume, the one with the greatest mass also has the greatest. The specific heat capacity of a substance is the amount of heat that needs to be supplied to a unit mass of that substance to raise its temperature through 1° Celsius or Kelvin. Molecules are, in general, farthest apart from one another in. These can only be found in science journals. The periodic table helps us to classify and compare various elements on the basis of their chemical behavior. If the average speed of the hydrogen molecules was originally v, their new average speed is, In order to double the average energy of the molecules in a gas at 200 K, its temperature must be changed to, Fifty kJ of heat is added to a 10-kg piece of lead at its melting point of 330°C and 2 kg of lead melts. Which of the following quantities is independent of the size and shape of n object composed of given material? heat capacity = How do I calculate D something? I the two cars stick together, the wreckage has an initial speed of. water is 33.20ºC. The physical principle involved is, When a skater pulls in her arms to turn faster, her angular momentum. The table at right lists the specific heat capacities of some common substances. It’s not possible to present values for all compounds. where q is the heat added or taken away in J, ΔT is the temperature change in ºC and m is the mass in grams. In biology class today my teacher played a porn video to show what they were talking about Should I talk to the principal to get her fired. If you are searching for a reference table listing specific heat capacity of metals and compounds, this article will be a useful read. C. the smallest particle of a substance that is representative of the substance. Properties of Various Ideal Gases (at 300 K) Gas: Formula: Molar Mass: Gas constant: Specific Heat at Const. Which of the following quantities is always the same to all observes? We also use third-party cookies that help us analyze and understand how you use this website. When a 3.80g sample of liquid octane is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.3 degree C. The heat capacity of the calorimeter, measured in a separate experiment is 6.18 kJ/ degree C. A. strike the container walls more often. When heat is added to a body of matter, the resulting temperature increase does not depend upon, Of the substances below, the one with the highest specific heat is, Of these substances, the one with the lowest specific heat is, A typical metabolic rate while walking is. Well, we're looking for good writers who want to spread the word. The change in the balls momentum is, A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s. These cookies do not store any personal information. Join Yahoo Answers and get 100 points today. A. the vaporization of a solid without first becoming a liquid. The volume occupied by 320 g of brass is, The density of air is 1.3 kg/m3. D. releases a great deal of heat when it condenses. Which of the following is not true of molecular motion in a gas? If a shell fired from a cannon explodes in midair, An 800-kg car moving at 80 km/h collides head-on with a 1200-kg car moving at 40 km/h in the opposite direction. The heat a refrigerator absorbs from its contents is, The entropy of a system is a measure of its, Ethanol boils at 172°F. The physics of a heat engine cannot be used to understand the operation of a. D. removes heat from a region and carries it elsewhere. Octane is a hydrocarbon and an alkane with the chemical formula C 8 H 18, and the condensed structural formula CH 3 (CH 2) 6 CH 3.Octane has many structural isomers that differ by the amount and location of branching in the carbon chain. The numerical reading on the Fahrenheit thermometer. The melting point of water is 0°C. Which is correct? If it is to be 40 percent efficient, a heat engine that exhausts heat at 350 K must absorb heat at a minimum temperature of B. The specific heat capacity of a substance is the amount of heat that needs to be supplied to a unit mass of that substance to raise its temperature through 1° Celsius or Kelvin. Its maximum efficiency is, If it is to be 40 percent efficient, a heat engine that exhausts heat at 350 K must absorb heat at a minimum temperature of, An ideal frictionless engine takes in 10 kJ of heat per second when it operates between 500 K and 400 K. The work that the engine does per second is.


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