The properties of several different materials are being compared. Its density is, A 400-kg concrete block is 1 m long, 0.6 m wide, and 0.3 m high. Be it a chemistry experiment or the use of metals in a foundry, one needs to have accurate information about the specific heat capacities of certain metals and compounds. Calculate the heat of combustion of octane in kJ/mol. Vol. Since heat capacities of compounds are not constants, you will need to refer a table of measured specific heat capacities of a substance at different temperatures, if necessary. The physical principle involved is, When a skater pulls in her arms to turn faster, her angular momentum. How long will it take for a 2-kW heating element to raise the temperature of 30 kg of water from 20°C to 80°C? 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. The highest pressure is, A container holds 1 g of air at atmospheric pressure. This category only includes cookies that ensures basic functionalities and security features of the website. We also use third-party cookies that help us analyze and understand how you use this website. Since this is a combustion reaction, heat flows from the system to the surroundings- thus, it … 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. If the samples all have the same volume, the one with the greatest mass also has the greatest. The average pressure of the atmosphere at sea level corresponds to which one or more of the following? what happens when radium-226 is converted to radon-222. The specific heat capacity has units of J/gºC. These cookies do not store any personal information. The specific heat of copper is. But opting out of some of these cookies may have an effect on your browsing experience. Different substances have different heat capacities. These cookies will be stored in your browser only with your consent. The air in a room 5 m long, 4 m wide, and 2.5 m high has a mass of, A 400-kg concrete block is 1 m long, 0.6 m wide, and 0.3 m high. 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. Necessary cookies are absolutely essential for the website to function properly. The table presented below, provides the specific heat capacity of some metals at constant pressure (cp). 6789 Quail Hill Pkwy, Suite 211 Irvine CA 92603. This website uses cookies to improve your experience while you navigate through the website. D. may be smaller or larger than that on the Celsius thermometer. We hope you are enjoying ScienceStruck! The unit used for its measurement is joules per gram degree Kelvin (J/g K). Which is correct? In order for an object to sink when placed in water, the object's average density must be. The point to be noted here, is that the values presented here are those for metals, at 25° Celsius. Metalloids are elements from the periodic table with properties that lie between metals and non-metals. Relative to their original average energy, the new average energy of the molecules is, When a gas is forced into a smaller volume without a change in temperature, its pressure increases because its molecules. It can exert three different pressures on a horizontal surface, depending on which face it rests on. Rolling a ball up an inclined plank requires an amount of work proportional to the, An object that has linear momentum must also have, A gold ball and a ping-pong ball are dropped in a vacuum chamber. Which of the following quantities is independent of the size and shape of n object composed of given material? Copyright © Science Struck &, Inc. If they stick together, the wreckage now has an initial speed of, When a ton of coal burns, it loses 3.3 10^-7 kg of mass. A. its density is less than that of water. The pressure at the bottom of a barrel filled with liquid does not depend on the, The pressure on the bottom of an object inside a liquid is, A cake of soap is placed in a bathtub sink. The specific heat of water is 4.184 J/g ºC. heat capacity = How do I calculate D something? Which of the following formulas relating temperatures on the Celsius and Fahrenheit scales is correct?

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