Forensic chemistry

Aim: To classify unknown substances according to their structure type and to observe how the structure of materials affects their uses. Equipment: 1. Bunsen Burner 2. Heat proof mat 3. Test tube x6 4. Beaker x 2 5. Peg 6. Wire 7. Watch glass 8. Conductivity set (including power pack) 9. Leads x2 10. Hydrochloric acid 11. Spatula 12. Stirring rod 13. Distilled water Two unknown substances Safety Concerns: Safety glasses: Wear safety glasses to protect eyes from substances, acids and flames that

As seen in figure 1, the amount of oxygen increased from 20.75% to 22% rapidly between 20 and 30 seconds. There was also an aggressive increase between 170 and 180 seconds from 27.1% to 28%. Otherwise, the increase was relatively stable, with slight increases and decreases throughout. On the other hand, when an acid and base (hydrochloric acid and sodium hydroxide, respectively) were added to the reactive solution, the increase was relatively stable for the acid, while inconsistent for the base,

Chemistry has sparked my interest since the first time I enrolled in a chemistry class my sophomore year in high school. The simple mixing of different chemicals could transform a solution from completely clear to a brightly colored solution once I witnessed this I was hooked. Due to this interest, I enrolled in chemistry for the next three years in high school completing first honors general chemistry, followed by advanced placement (AP) chemistry, and finally organic chemistry at a local community

Some of his inventions are hard to believe that they actually existed but it is said that he invented a giant reflecting mirror to set ships sails on fire. It is also said that he invented a giant crane to move an enemy ship completely out of the water in order to keep it from attacking their land (Bruno 24). A well known story about Archimedes is that he discovered that every item has a different density. It is said that he was in the bath tub and realized that the water would rise up when different

The recrystallized cinnamic acid was obtained from the previous lab. It was a white and flaky powder and had a very slight sweet/spicy smell. When weighed, the recrystallized cinnamic acid was only .340 g. The starting amount was .500 g, so the percent recovery was 68.0%. ((.34g/.50g) x 100%)). The low percent recovery may have been due to the addition of too much solvent(book). Last lab, 90.0 mL of solvent was used to dissolve the cinnamic acid, which was the maximum amount directed by the instructor

Prior to this experiment, the onion bulb was needed to be rooted underwater. Getting to the lab, the entire root of an onion was removed through tearing. With the use of a razor blade, the tip of the root was cut approximately last 2 mm of the root. Then the tip of an onion root was placed on a clean glass slide with 1-2 drops of 1N HCl and heated through the alcohol lamp within a 2-second interval of 30 seconds. After that, the root tip was cooled for at least 10 minutes in the warm HCl solution

Temperature affects lava flow by increasing or decreasing the viscosity, therefore affecting the speed at which the lava flows. In the graph presented, the visual data clearly shows that as the temperature of the syrup rises, the velocity increases. The overall average velocity for all the groups who used cold syrup was 1.34 cm/s. The overall average velocity for the groups who used room temperature syrup was 4.43 cm/s, and the overall average velocity for the hot syrup groups was 6.82 cm/s. This

To determine each solution's freezing point certain methods and materials were used. First, two weighing boats were labeled NaCl and CaCl2. Each weigh boat was placed on the scale to calculate the initial weight of the boats. 2.0g of sodium chloride was added to the boat labeled NaCl and reweighed. The same was done for CaCl2, then the freezing point apparatus was assembled. Using a 600mL beaker filled with ¾ full of ice, the remainder of NaCl was poured into the beaker and mixed. The thermometer

In this experiment after we did the setup we began by positioning the lens at the 50cm position and moved the viewing screen until a focused image of the crossed arrow appeared and we then recorded in our table the distance from the lens to the viewing screen as our image distance. We also used a Vernier Caliper for measuring the image height on the viewing screen and recorded those values for image height on our table and we repeated these steps for each object distance listed. For the second part

Physics 20 Chapter 7 Masses and Springs explorations employing pHet simulations Selena Xu Phet simulations: https://phet.colorado.edu/sims/mass-spring-lab/mass-spring-lab_en.html Masses and springs simulation Part 1: Exploration Describe (sentences) the effect that manipulating each of the following variables has on the SIMPLE HARMONIC MOTION of the spring system. (Note, period, amplitude, speed max in description. 1. mass on the spring By manipulate the mass of the bob, the SIMPLE HARMONIC