As the drops are being added, a distinct yellow color can be observed where the drops were landing in the solution. The solution then turned blue-green and very cloudy when about 50 drops of NH3 were added. A distinct dark blue color was evident where the drops were landing in the solution. Also, there was an emission of gas while the NH3 was being added. Another change of color and clarity is evident when 15.0mL of H2SO4 was added to the
| Graded Assignment Lab Report Answer the questions. When you are finished, submit this assignment to your teacher by the due date for full credit. (5 points) |Score | | | 1. Describe generally what happened to each spot of each type of ink. Which had the most pigments?
It looks as if the oil has placed a thick line of film on the water 3 After pouring the vinegar in the water the only change I noticed was that the water seemed to be a shade darker when added it. The water looks like it is clouded some. Other than the smell a person would not be able to tell there has
25.0 cm3 of this solution was titrated against 0.1 moldm-3 HCl and 24.5 cm3 of the acid were required. Calculate the value of x given the equation: Na2CO3 + 2HCl → 2NaCl + CO2 + H2O 6. 25 cm3 of a sample of vinegar (CH3COOH) was pipetted into a volumetric flask and the volume was made up to 250 cm3. This solution was placed in a burette and 13.9 cm3 were required to neutralise 25 cm3 of 0.1 moldm-3 NaOH. Calculate the molarity of the original vinegar solution and its concentration in gdm-3, given that it reacts with NaOH in a 1:1 ratio.
The test tube that showed signs of change was the test tube that contained I2 & H, which turned dark red and had some strong odor and did dissolved. I think it would be a chemical change because it showed that it dissolved and had an odor to it. 5. Was the reaction in Test 2 a physical or chemical change? Why?
Armadillidum vulgare: Light vs. Dark Environments By:Mya Davidson Abstract It is hypothesized that an isopod would prefer a dark environment rather than a light environment based on its natural habitat of soil. For the light vs. dark experiment, a container had 5 isopods on the light side and 5 isopods on the dark side. A study was taken for 5 minutes where every thirty seconds the number of isopods in each dish was counted. The results showed that isopods, like its natural habitats, preferred dark places.
They are methyl red, Simmons citate and H2S producing positive. Salmonella suspect colonies grow as red colonies with a black center in Xylose Lysine Deoxycholate (XLD) agar. Red slant (alkaline) and yellow butt (acid) with H2S production is another characteristic of Salmonella in Triple Sugar Iron (TSI) agar (Quinn et. al., 1994). On the other hand, serology or serotyping is based on the characterization of the somatic (O), flagellar (H), and envelope (V)
For part 2, do the same thing as part 1 except use an unknown hydrate and calculate the percent mass of water in an unknown hydrate. Observations Part 1 At first the hydrate was a crystal red color. When it was placed on the hot plate and its state changed it began to change color. As it heated it started to become liquidly and bluish in color. Once it cooled down it became a purplish black color.
Stop & Think Questions: What is the relationship between fluid flow and viscosity? You correctly answered: b. They are inversely proportional to each other. What effect do you think aplastic anemia (reduced red blood cells) would have on blood flow? You correctly answered: a. increased blood flow due to decreased viscosity Experiment Data: Flow (ml/min) 490.6 245.3 163.5 122.7 98.1 81.8 70.1 61.3 Radius (mm) 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 Viscosity 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Length (mm) 50 50 50 50 50 50 50 50 Pressure (mm Hg) 100 100 100 100 100 100 100 100 02/09/15 page 2 Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly.
NH4+ Heat 5mL of the test solution in a beaker. Test the gas evolved with damp red litmus paper. The damp red litmus turns blue Ammonia gas. - 4. Ag+ Add HCl(aq) to original solution.