Explain why the evaporation of water is a physical change and not a chemical change.

Calculate the amount of heat released when a 225g sample of gold cools from 86.0C to 32.5C. The specific heat of gold is 0.129 J/gC.

Determine the heat in kJ to heat 7.18 moles of ice from -29.286 degrees celcius to -2.357 degrees celcius. the specific heat of ice is 2.03 J/g degrees celcius.

Calculate the amount of heat needed to raise the temperature of 55.0 g of liquid water from 25°C to 99°C. The specific heat of liquid water is 1.00 cal/g °C

calculate the amount of heat released by 23.0g of water when its temperature is cooled from 68.0'C to 31.0'C. the specific heat of water is 4.18 j/g'c

Suppose a boil water notice is sent out advising all residents in the area to boil their water before drinking it or using it for cooking. You need to boil 18.0 L of water using your natural gas (primarily methane) stove. What volume of natural gas is needed to boil the water if only 10.1% of the heat generated goes towards heating the water. Assume the density of methane is 0.668 g/L, the density of water is 1.00 g/mL, and that the water has an initial temperature of 21.4 °C. Enthalpy of formation values can be found in this table. Assume that gaseous water is formed in the combustion of methane.