automotive batteries are an example of a galvanic cell. this cell is created using lead (iv) oxide and lead, contained in a 4.2-5 m sulfuric acid solution. in the cells, lead (iv) oxide is converted to lead (ii) sulfate, and lead is converted to lead (ii) sulfate. this redox reaction produces a voltage that is then used to start the combustion engine in a motor vehicle. while the engine is running, an alternator is used to re-charge the cell using the energy generated by fuel combustion. the standard reduction potentials for the half-reactions used in this cell are:

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent

Why do oxygen have a strong attractive force for electrons