Consider a block of wood having a volume of 125 cm³. If the clock of wood burns at a rate of 15 g/min and you take the density of the wood as 757 kg/m³, how long will it take for the block to burn completely?

A company pays the electric company at a rate of $0.18 per kilowatt-hour for their power. The factory uses three ventilator fans to keep the workers safe from dust. Each fan has a 1 horsepower motor. The company runs the fans continuously 24/7. How much is the company’s energy cost per month (30 days) to operate the ventilation system?

A sample of copper absorbs 43.6 kJ of heat, resulting in a temperature rise of 75.0°C, determine the mass (in kg) of the copper sample if the specific heat capacity of copper is 0.385 J/g°C.

During an experiment a student mixed two chemicals together and noted that the beaker felt warm to the touch after the reaction was complete. In the experiment, the chemicals would be classified as the From this observation, the student concluded that the reaction was A. Which of the following energy pathway diagrams represents the chemical reaction from the student's experiment? Ep (kJ) Select one: OA OB 150 125 100 + and the beaker would be classified as the Reaction Coordinate and that the resulting change in enthalpy (AH) would have a B. 125 E 100 Reaction Coordinate Ep (kJ) 150 ◆ value.

A 8.0-kg rock is dropped from a height of 3.0 m. At what height is the rock's kinetic energy twice its potential energy?

A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0 °C to 35.5 °C. If the specific heat of aluminum is 0.900 A J/g°C, what is the mass of the sample (in grams)?

MISSED THIS? Watch KCV: Heat Capacity, IWE: Thermal Energy Transfer; Read Section 7.4. You can click on the Review link to access the section in your e Text. A 32.1 g iron rod, initially at 21.5 °C, is submerged into an unknown mass of water at 63.5 °C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 58.5 °C. Part A What is the mass of the water? Express your answer to two significant figures and include the appropriate units. m = Submit 0 °H | |µÅ Value Units Previous Answers Request Answer ?

A chemist burned a sample of coal in a bomb calorimeter. Her results are below. Calorimeter's Heat Capacity 7.264 kJ/°C Mass of Coal Initial Temperature Final Temperature 0.100 g 22.07°C 25.37°C The sample of coal that the chemist placed in the bomb was dry but when she finished the test there was a small amount of water in the bomb. Where did this water come from and how does it affect her result? The water came from the water surrounding the bomb so her measured heat of combustion is for a closed system. The water was a product of combustion so her measured heat of combustion is for an open system. The water came from the water surrounding the bomb so her measured heat of combustion is for an open system. The water was a product of combustion so her measured heat of combustion is for a closed system.

A 4.81 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee cup calorimeter. Before placing the sample in the water, the temperature of the salt and water is 23.72°C. After the salt has completely dissolved, the temperature of the solution is 28.54°C.   If 3.12 × 10³ J of heat was gained by the solution, what is the total heat for the dissolution reaction of the 4.81 g of salt?   How many moles of the unknown salt were used in the reaction ?     _______ J?

The kilowatt-hour (kWh) is a common unit in measurements of the consumption of electricity. What is the conversion factor between the kilowatt-hour and the joule? Express 15.3 kWh in joules.