A memo in Silent Hill 3 gives a brief description of Aglaophotis.
Measuring density will be almost the same as you did in the previous lab. Safety Many organic liquids are toxic and flammable, so you should exercise care whenever handling them.
Do not breathe the vapors. Do not allow unknown liquids to come in contact with your skin. If this happens flush the area with copious amounts of water. These tips are not only good for working in a chemistry lab, but also for handling solvents and cleaning solutions around the home.
Your skin is pretty good at repelling water-based liquids because of the natural oils sebum in the skin, but non-polar organic carbon-based liquids will wash away these oils and so organic compounds will pass through the skin and enter the blood stream.
Some first aid for organic liquid skin exposure not only includes flushing with water but also applying anti-bacterial creams because skin without these oils is more susceptible to bacteria. The unknowns are flammable. Keep them away from all flames. On the right is a photo of a lab fire at Texas Tech University.
A 4 liter bottle of flammable liquid broke. It was in the hood with some hot plates, which provide the source of ignition. Fortunately, those did not catch fire. To read more about the incident visit: Also, you need a rubber stopper with a thermometer inserted into one hole and a right-angle bent glass tube inserted in the other hole.
Rubber tubing is attached to the end of the glass tubing. Safety Do not push or pull the thermometer or bent glass to change their position. They will easily break if you try to move them. Density determination of an unknown liquid Procedure The density of a substance is a measure of its mass per unit volume.
The density of a liquid will vary with the temperature but this change is usually negligible if the temperature change is small. So you may see: Pickup your unknown liquid.
Each one has a unique number. Write the number on the Data Sheet on page The small jar has boiling chips in it.
You will need one or two for the boiling point determination. Weigh a clean, dry, small stoppered Erlenmeyer flask as accurately as possible. Use the technique from the density lab which says to handle the flask with a paper towel because fingerprints will alter the mass of the flask. Also, follow the other techniques used in the density lab as far as using the analytical balance.
To review the techniques for using the pipette, the below link will open up a tutorial for using a pipette in a new window.
Just close that window when finished. So make sure your pipette is clean and dry before measuring out the Using a Pipette Tutorial Replace the stopper avoiding any contact between the stopper and the liquid. Some liquids dissolve rubber stoppers. The green neoprene stoppers used here are more resistant to solvents, but getting an unknown liquid on the stopper should be avoided from that standpoint and the fact that you could loose some of the mass of the liquid from evaporation off the sides of the stopper.
Weigh the Erlenmeyer flask, stopper and added liquid on the same balance used for the initial measurement.
If a balance is weighing a little high or low, weighing the flask on the same balance will cancel that error when subtracting the flask weight from the weight of the flask and liquid. Calculate the mass of the Calculate the density of the unknown to four significant figures. This is necessary since many of the unknown liquids in Table 3.
Once the density has been calculated, try to eliminate compounds that have densities far from this experimental value of course, you need to be sure that your density determination is accurate. Since the volume is measured with four significant figures and the calculated liquid mass will also have four significant figures, you are justified in having four significant figures in the calculated density.
Boiling point determination for an unknown liquid Add approximately 5 mL of an unknown liquid to a 25 x mm pyrex test tube.what is the density of the unknown liquid? Calculate the mass of the liquid only.
Mass of the container: grams Obviously the average density of the unknown compound is . Jul 15, · An empty container weighs g. When filled with water (density = g/mL), it weighs g. When filled with an unknown liquid to the same mark as it was filled with the water, it weighs metin2sell.com: Resolved.
Observations: The unknown is a clear, colorless liquid. There is a detectable odor, but it does not lend itself to identifying the unknown. Teenager, 19, is arrested on suspicion of grievous bodily harm after man had ‘unknown liquid’ thrown at him minutes after another victim was stabbed in ‘linked attacks’ in Essex.
A Buckeye woman was reportedly stabbed, forced to drink an unknown 'white liquid' and held hostage in a closet recently. I set up a liquid discovery experiment with three different types of “white substances” – cornstarch, soda and cream of tartar.
I also added several test tubes, water to make solutions, and a brown “unknown liquid” – iodine solution. This time I was hoping not only to show Smarty some.