1. Define the following terms: a. Decantation: b. Centrifugation: c. Supernatant: d. Precipitate: 2. What reagent(s) can be used to confirm Ag+, Pb2+, and Hg22+ ions? 3. List all the solid precipitates that you encounter and their colors. 4. What is the precipitating reagent for the silver ion in step 1? Would a solution of NaCl work as well? 5. What was your assigned unknown color? Could you make an educated guess on what ions may be present based on its initial color? 6. 6M HCl is added to a solution of silver, copper, and iron cations. A white precipitate forms. Predict which ions are present. Explain.

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?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?