How is an equation described if the number of atoms of each element in the products equals the number of atoms of each element in the reactants? a. not spontaneous b. balanced c. an acid-base reaction d. spontaneous​

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c