Vinegar (acetic acid) in a solution will react with chalk (calcium carbonate) a solid. the rate of the reaction can be determined by how quickly carbon dioxide, one of the products, is produced. which solution of acetic acid will produce the highest reaction rate?
a. 1%
b. 2%
c. 4%
d. 8%

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

How do cracks affect the rate of weathering?