This was done by taking small amounts of the unknown acid. It was then placed into capillary tubes and inserted into the Bibby Sterilin Device. Starting with a high plateau to find a quick melting point and then proceeding to find an actual melting point. The next experiment that aided in finding more characterizations of unknown #2651145-PLF13 was equivalent weight. In order to find the equivalent weight a titration of the unknown acid had to be conducted.
It binds with starch so the more starch, the darker the solution was. We also used a blank solution with no starch to set the spectrometer to zero. The spectrometer was used to compare the absorbency of the starch in the control solutions and the non-control solutions over time. Amylase was the last solution added to start the initial breakdown of the starch. Adding it at one minute intervals allowed the students to see how much starch the amylase was actually breaking down over time.
Then you place another 200 gram mass on the 210 degree mark. Then we have to replace the mass at the 30 degree mark with two masses, one at the 0 degree mark and one at the 80 degree mark. Essentially we are trying to calculate the x and y component vectors of a 200g mass at 30 degrees. So what we did was we just guess and checked the variables of weight at the 0 degree mark and at the 90 degree mark’s pullys until the ring was centered. You can us+e the weight on each pully to calculate the magnitude and the direction of the component vectors at 90 and 0 degrees.
The middle layer is a group of laser beams. And the inner layer is nanotubes that protect structures from laser beams. Later he argues the lasers will destroy objects, which the lasers will go that get through the force field. To fix that problem Kaku thinks that the force field needs to have photochromatics. Then Kaku states that force fields can do more than deflecting laser beams because it can levitate objects by the use of magnetic force fields.
The length of time it took for each sample to freeze was recorded as shown below. Amount of salt added in grams (g) | Time it took for the water to freeze in minutes (min) | 0 | 48 | 1.25 | 69 | 2.50 | 76 | 3.70 | 90 | 5.0 | (Did not freeze during the time of the experiment) | Identify the independent and dependent variables in Carmen’s experiment. Do the experiment and results support the hypothesis as it was written? Explain your answer. Identify some specific changes that you would suggest for Carmen’s experiment in order to specifically test her hypothesis.
Choose which variable you want to eliminate; the coefficients of the variables must be exact opposites. You will only use two equations at one time. Second add the two equations together to cancel out your variables. IF nothing cancels than you have to multiply one or both of your equations by a number that will create an equal. Then for the unused equation and any of the other two equations repeat steps above.
Make the new dilution series. Remember to start with salt concentration where the egg first floated. (If you don't have enough solution from the original serial dilution, make some more by starting from the stock solution.) 8. As before, test the egg in each cup, starting with the lowest salt concentration.
These conditions are more suitable for ionic bonds. That is why the sucrose and salicylic acid did not have good results, because they have covalent bonds. There were a few sources of error that could be improved in the experiment. For example, when the substance was poured into the test tubes, some of the compound remained stuck to the weighing paper. If we used a stick resistant material for this step, the whole 1g would be accounted for.
When we added the 1mL of Cu(NO3)2 a reaction took place and the solution turned from a blood red to a muddy brown. With the other test we did with test tubes 3 and 4 , we added 1mL of KI and it reacted with the solution, turning to a dark green showing an excess of Cu(NO3)2. Then, when we added 1mL of Cu(NO3)2, no reaction took place.
Also this lab teaches about measurement uncertainty can be calculated using the percent error equation. These are the purposes of the lab. My hypothesis of this experiment is that the velocity of an object, the ball rolling down a ramp or falling down, changes at a constant rate, thus uniform acceleration occurs. Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity over time. An object accelerates if its velocity is constantly changing, also known as speeding up or slowing down.