If you drop a 25-gram piece of metal that has a temperature of 100° celsius into 1000 grams of water at 20° celsius, what best describes what would occur? 1. the temperature lost by the metal will equal the temperature gained by the water 2. the heat lost by the metal will equal the heat gained by the water 3. the final temperature will be 60 degrees celsius 4. the final temperature will be more than 60 degrees celsius

Answer is: 2. the heat lost by the metal will equal the heat gained by the water.

1) the temperature lost by the metal will equal the temperature gained by the water is not correct, because temperature is the intensity of heat present in a substance and a thermometer is a device that measures temperature or a temperature gradient.

3) the final temperature will be 60 degrees celsius  is not correct, because amount of water is greater than amount of metal, so the the final temperature will be less than 60 degrees celsius.

4) same as 3).

the answer is a

photosynthesis

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.