Environmental chemistry

The purpose of this lab was to find the acceleration of a toy car and create graphs to display this acceleration. These graphs will then be compared to graphs of what is expected for perfect constant acceleration. In order to find the acceleration of the toy car, a strip of ticker tape was attached to one of those toy cars that you pull back and move once your hand releases the car. After attaching the ticker tape and feeding the tape through the spark timer, the timer was turned and the car…

Today in lab we worked/talked about DNA. DNA is molecules called nucleotides. What is the main purpose of DNA ? The main role of DNA in the cell is the long-term storage of information. Where is the DNA found in the body ? Most DNA is located in the cell nucleus. Okay so in lab, we did an experience. We used A Heavy duty ziploc bag, 1 strawberry [including the stem], 10 mL DNA extractions buffer [ soapy, salty water], Cheesecloth, Funnel, 50mL vial/ test tube, Glass rod, Inoculating loop, or…

A range of concentrations (1nM to 30μM) of acetylcholine (Ach) and 5-hydroxytryptamine (5-HT) was administered to organ bath containing rat ileum. Ach and 5-HT induced contractions from 3nM (Fig. 1) and 10nM (Fig. 2) onwards respectively, both generating a shallow slope at the beginning of the concentration-response curve. EC50 of Ach is 7.47 x 10-7M whereas EC50 of 5-HT is 7.97 x 10-7M. The contraction generated by Ach and 5-HT was expressed in % Emax. As shown in Fig. 1 and 2, % Emax…

In experiment 1.1, we studied the relationship molecule size has with diffusion rate. Our hypothesis claimed that smaller molecules will travel farther across the agar plate given the same duration of time. Based on the data collected, our hypothesis was proven true. Potassium permanganate has a molar mass of 158 g/mol, methylene blue 319.85 g/mol, and potassium dichromate with 294.185 g/mol. Potassium permanganate diffused the farthest, potassium dichromate second, and methylene blue secured…

As long as I can remember I have always had a passion for science. I have always been curious about the why and how of things, and have been fascinated with exploring all there is to know about the Earth. Science is such a complex subject, with many different areas and fields of study, there is always more to learn. When I was younger I remember being excited to join my first Science Olympiad team, and have the opportunity to aggrandize my knowledge about the different fields of science in a…

Michael Gugliotta 9/29/14 Chemistry Period 8 Title: Observations of a Candle Research Question: Observations are needed to explain the physical world. Introduction: Candles are very useful in science and society. They help provide…

Abstract:- The experiment illustrates the relationship between the limiting reagent and the amount of product produced as a result of a chemical reaction. The chemical reaction was carried out by mixing the solution of Na2CO3 and CaCl2 and the precipitates of CaCO3 were obtained as a product. The experiment was carried out in 4 trials in order to determine the limiting reagent and the actual yield of the product obtained. In the first three trials, Calcium Chloride was the limiting reagent and…

Observations In step one an ice bath was prepared. Then in step two, a pipette was used to measure 1 mL of concentrated nitric acid into a 10 mL graduated cylinder. The concentrated nitric acid was placed into a reaction tube and clamped in the water bath. In step four, 1 mL of concentrated sulfuric acid was added slowly to the traction tube with nitric acid. Then the mixture was left to sit in the ice water bath for at least five minutes. A small plastic bag was filled with ice and a towel was…

In this project the aim is to determine the equilibrium constant (Kc) of a weak base when it reacts with a weak acid. The chemicals I wish to determine the equilibrium constant for are, Ethanoic acid (CH3COOH) and Propanol (C3H7OH). To accomplish this, the first question we must ask is, “what is an equilibrium constant and how is it determined”? There are 2 different types of equilibrium. The first, and the type we shall be using is known as homogeneous equilibrium which has everything present…

The purpose of this two-part experiment was to convert an alkene to alkyne. This is difficult to accomplish in one step, thus a multi-step process was used to produce the alkyne. First, bromination of stilbene through the electrophilic addition of bromine to the double bond was performed through an SN2 reaction, as outlined in Figure 3. Pyridinium tribromide, the source of bromine, since elemental bromine is too corrosive and hazardous, was generated in situ (Figure 1). The bromine was added…