Automobiles are powered by an internal combustion engine. The engine converts the chemical energy in gasoline and oxygen into heat, that is then transformed into the propulsive energy that moves the automobile. Which statement most accurately describes the energy used to move the automobile ?
B
A Kinetic energy is stored by chemical and thermal energy
The chemical energy stored in gasoline and oxygen is converted into thermal energy and is then transformed into mechanical energy.
Thermal energy is transformed into chemical energy and is then converted into mechanical energy
The chemical energy in gasoline and oxygen is converted into heat.
C
D

What is the mass of sodium in 3 moles of sodium chloride

Why did southern business leaders want to increase the number of slaves

Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?