Ancient metalworkers in east africa knew the secrets of strengthening their iron. they knew that if they melted their iron in a furnace fired with coal, then when it cooled and solidified it would be harder than the original iron. what really happened inside the hot furnace? coal is a form of carbon, so when its heat melted the iron, tiny particles of carbon dissolved into the liquid iron. this formed a solution. when the mixture of carbon and iron cooled and solidified, it was much harder than the original iron. since it was harder, it was much more useful for building things like tools and weapons. this solution of carbon dissolved in iron is called steel. every time you use a tool made out of steel, you are benefiting from the discoveries of those ancient metalworkers from long ago. read the description of how ancient metalworkers improved their iron. then identify the solute and solvent by filling in the blanks. in steel, the solvent is and the solute is .

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

Nanotechnology, the field of trying to build ultrasmall structures one atom at a time, has progressed in recent years. one potential application of nanotechnology is the construction of artificial cells. the simplest cells would probably mimic red blood cells, the body's oxygen transporters. for example, nanocontainers, perhaps constructed of carbon, could be pumped full of oxygen and injected into a person's bloodstream. if the person needed additional oxygen-due to a heart attack perhaps, or for the purpose of space travel-these containers could slowly release oxygen into the blood, allowing tissues that would otherwise die to remain alive. suppose that the nanocontainers were cubic and had an edge length of 24 nanometers. part a part complete what is the volume of one nanocontainer? (ignore the thickness of the nanocontainer's wall.) express your answer using two significant figures. v v = 1.4ă—10â’20 l previous answers correct significant figures feedback: your answer 1.3824â‹…10â’20 = 1.382ă—10â’20 l was either rounded differently or used a different number of significant figures than required for this part. if you need this result for any later calculation in this item, keep all the digits and round as the final step before submitting your answer. part b suppose that each nanocontainer could contain pure oxygen pressurized to a density of 81 g/l . how many grams of oxygen could be contained by each nanocontainer?

Label a-f based on the table using c for concentrated and d for dilute