To determine:
The number of Calories that is burned by the person, if he runs for
Introduction:
Energy is the capacity to do work. It can be of various forms like kinetic energy, potential energy, chemical energy, and light energy. Energy is measured in term of joule, calorie, and erg.
Calorie is the unit of energy. It is smaller than joule and is denoted by calorie.
Nutritional calorie is the unit of energy. One nutritional calorie is equal to
Hour is the unit of time. One hour is equal to
To determine:
The number of joules that is burned by the person if he runs for
Introduction:
Energy is the capacity to do work. It can be various forms like kinetic energy, potential energy, chemical energy, light energy. Energy is measured in term of joule, calorie and erg.
Calorie is the unit of energy. It is smaller than joule. It is denoted by calorie.
Nutritional calorie is the unit of energy. One nutritional calorie is equal to
Joule is the unit of energy.
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General, Organic, and Biological Chemistry (3rd Edition)
- A book is held 6 feet above the floor and then dropped. Which statement is true? a.The potential energy of the book is converted to kinetic energy. b.The potential energy of the book is destroyed. c.Kinetic energy is created. d.The total energy of the system will not be conserved.arrow_forwardDuring a recent winter month in Sheboygan, Wisconsin, it was necessary to obtain 3500 kWh of heat provided by a natural gas furnace with 89% efficiency to keep a small house warm (the efficiency of a gas furnace is the percent of the heat produced by combustion that is transferred into the house). (a) Assume that natural gas is pure methane and determine the volume of natural gas in cubic feet that was required to heat the house. The average temperature of the natural gas was 56 F; at this temperature and a pressure of 1 atm, natural gas has a density of 0.68 1 g/L. (b) How many gallons of LPG (liquefied petroleum gas) would be required to replace the natural gas used? Assume the LPG is liquid propane [ C3H8 : density, 0.5318 g/mL; enthalpy of combustion, 2219 Id/mo for the formation of CO2(g) and H2O(l) ] and the furnace used to burn the LPG has the same efficiency as the gas furnace. (c) What mass of carbon dioxide is produced by combustion of the methane used to heat the house? (d) What mass of water is produced by combustion of the methane used to heat the house? (e) What volume of air is required to provide the oxygen for the combustion of the methane used to heat the house? Air contains 23% oxygen by mass. The average density of air during the month was 1.22 g/L. (f) How many kilowatt—hours ( 1kWh=3.6106 J) of electricity would be required to provide the heat necessary to heat the house? Note electricity is 100% efficient in producing heat inside a house. (g) Although electricity is 100% efficient in producing heat inside a house, production and distribution of electricity is not 100% efficient. The efficiency of production and distribution of electricity produced in a coal-fired power plant is about 40%. A certain type of coal provides 2.26 kWh per pound upon combustion. What mass of this coal in kilograms will be required to produce the electrical energy necessary to heat the house if the efficiency of generation and distribution is 40%?arrow_forwardSuppose that you are closing a cabin in the north woods for the winter and you do not want the water in the toilet tank to freeze. You know that the temperature might get as low as 30. C, and you want to protect about 4.0 L water in the toilet tank from freezing. Calculate the volume of ethylene glycol (density = 1.113 g/mL; molar mass = 62.1 g/mol) you should add to the 4.0 L water.arrow_forward
- A particulate-level illustration of the reaction AB+CDAD+CB is shown below. a Identify the reactants and products in this reaction. b Is the change shown chemical or physical? c Is the mass of the product particles less than, equal to, or greater than the mass of the reactant particles? d If the reaction takes place in a container that allows no energy to enter or leave, how does the total energy in the container after the reaction compare with the total energy in the container before the reaction?arrow_forwardClassify each of the following as aphysical or chemicalchange or property. A fireplace poker glows red when you heat it in the fire. A marshmallow turns black when toasted Loo long in a campfire. Hydrogen peroxide dental strips will make your teeth whiter. If you wash your jeans with chlorine bleach, they will fade. If you spill some nail polish remover on your skin, it will evaporate quickly. When making ice cream at home, salt is added Lo lower the temperature of the ice being used to freeze the mixture. A hair clog in your bathroom sink drain can be cleared with drain cleaner. The perfume your boyfriend gave you for your birthday smells like flowers. Mothballs pass directly into the gaseous state in your closet without first melting. A log of wood is chopped up with an axe into smaller pieces of wood. A log of wood is burned in a fireplace.arrow_forward1-86 The specific heats of some elements at 25oC are as follows: aluminum = 0.215 cal/g · oC; carbon (graphite) = 0.170 caI/g oC; iron = 0.107 cal/g mercury = 0.033 1 caI/g oC. (a) Which element would require the smallest amount of heat to raise the temperature of 100 g of the element by 10oC? (b) If the same amount of heat needed to raise the temperature of 1 g of aluminum by 25oC were applied to 1 g of mercury, by how many degrees would its temperature be raised? (c) If a certain amount of heat is used to raise the temperature of 1.6 g of iron by 10oC, the temperature of 1 g of which element would also be raised by 10oC, using the same amount of heat?arrow_forward
- friend of yours reads that the process of water freezing is exothermic. This friend tells you that this can’t be true because exothermic implies “hot,” and ice is cold. Is the process of water freezing exothermic? If so, explain this process so your friend can understand it. If not, explain why not.arrow_forward1.) In the laboratory a student finds that it takes 4.75 calories to increase the temperature of 10.4 grams of solid lead from 23.9 to 36.6 degrees Celsius. Based on these data, what is the specific heat of lead? 2.) In the laboratory a student finds that it takes 14.5 calories to increase the temperature of 12.3 grams of solid zinc from 21.9 to 35.7 degrees Celsius. Based on these data, what is the specific heat of zinc?arrow_forwardPerform the conversions between energy units. 441 kJ = = 2715 kcal = 6.45 × 106 J = J kJ kcalarrow_forward
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