 Okay, so let's do one of these density problems. This one says, a piece of silver with a total mass of 12.31 grams was placed in a graduated cylinder filled with 10.00 mils of water. The density of silver is 10.50 grams per mil. What will be the final volume in the graduated cylinder? So you would expect this volume to increase, right, because you've got a graduated cylinder with 10 mils of water in it, right, and then you're sticking something in there. So the final volume better be more than 10 mils, if you're putting something like 1.37 for your final volume then you're getting that wrong, okay? So the mass of silver is that, okay? Let's figure out how many milliliters of silver we have. What's the volume of silver, okay? So how do we do that? The volume of silver, well, we have the mass there, 12.31 grams, and remember, we have a conversion factor here. So grams for every 10 grams, 10.5 grams, which makes one milliliter, okay? So what we can do with this is use that as a conversion factor. So density you can use as a conversion factor going from mass to volume. So on the bottom we're going to have to put our mass to cancel it out, so 10.50 grams is one mil. So that's going to cancel that, right, and that's going to give us the volume of the silver, right? So the volume of the silver is the volume of the object that you put in there, 12.31 divided by 10.50. So this volume, the force sheet, is 1.172 mils, okay? So that's how much volume is in the silver, okay? So the final volume, well, the volume final, that's going to be the initial volume of plus the volume of the silver, does that make sense? Okay, so the initial volume is 10.00 mils, volume of the silver is 1.172 mils, okay? So this is going to go to two digits after the decimal point, so it's going to be just in my head, 11.17 mils, that's going to be the final volume of the graduated silver, okay? So make sure you're getting the number that's above 11 on these ones. Any question on this one? I hope. Wonderful.