Sodium chloride

In this unit of my 9th grade Physical Science, we are learning and experiencing with labs. In this week's experiment, my class did the paper towel lab. Here, we tested the quality of three different paper towel brands, Viva, Up&Up, and Bounty. Each lab group was testing for a certain quality of each brand, such as strength and absorbency. Through different experiments, each lab group came to the conclusion that one paper towel brand had more strength or better absorbency than the other two. My…

1. 4 agar plates were poured several days ahead in preparation for this experiment. They were stored in a Ziploc bag in the refrigerator until ready to use. 2. To perform this experiment are the: cultures of E. coli, S. cerevisiae, and S. epidermidis, three plastic inoculation loops, candle and lighter, three poured nutrient agar plates, a disposable cup, alcohol, paper towels, bleach, a permanent marker, gloves, mask, apron, and goggles. 3. Be sure to wash hands carefully with disinfectant…

A clean flame test wire was inserted into 0.2 M NaCl and also placed on the flame reputedly. A bright yellow persistent flame was a positive test of sodium being presented, then repeat the same instructions for the unknown ion. After the flame test wire was clean 0.2M KCl was dipped into the flame resulted a lavender color after several trials as well as the unknown solution. 10 drops of 0.1M Ca(NO3)2 in a test tube and 2-3 drops of 1M Na2C2O4, a white precipitate of calcium was present. The…

vitamin c, phenolphthalein, methyl orange, deionized water and the following chemicals: sodium hydroxide, potassium hydrogen phthalate, hydrochloric acid and sodium bicarbonate. When it comes to these chemicals, make sure to wear the general protective personal equipment and handle with caution because these chemicals can burn. (MSDS Solution Center) For week one, the students first had to prepare the sodium hydroxide and the hydrochloric acid. Both of these were done by taking a graduated…

Sodium diethyldithiocarbamate, limiting equivalent conductance (Λ0), ion association, activation energy and thermodynamic functions. Introduction: The measurement of electrical conductivities of dilute solutions of salts or complexes is considered to be one of the important methods for studying the ion-pair or multiple- ion association not only in aqueous solutions but also in non-aqueous or mixed ones 1-4. Also, conductivity measurements were used to evaluate the hydration free energy of some…

Question: How does functional groups on ethane impact the exothermic energy released during the combustion of the compound? Hypothesis: Equipment: Thermometer Ethane Ethanol Ethanoic Acid Fire and a skewer Weighing scale Ceramic Container 400ml beaker Aluminum foil Lab coat apron Safety goggles Retort stand and ring clamp Procedure: Wear your lab coat / apron and your safety goggles. Prepare 100ml of water into a beaker then cover it with an aluminum sheet. Poke a hole through the…

group, discuss and prepare their experiment. On the second lesson, students will have opportunities to carry out the investigation, then record, process, and evaluate their data. Preparing materials In the original experiment, hydrochloric acid and sodium hydroxide solutions have been used as acidic and basic solution, respectively. However, year 9 students might know that hydrochloric acid solution is an acid and…

CH 204- Introduction to Chemical Practices Experiment 1- Qualitative Analysis of Cations Sharon Alexander Kathrynn Labat TA: Yu-Chun Lin September 25, 2017 Results & Discussion This experiment was composed of three parts. In the first part, qualitative methods were used to identify the unknown cation in an aqueous solution. The cation was to be either lead or silver. If silver was present, extra steps were needed to be taken in order to confirm its presence in the…

CaBr2 is an ionic compound, because the second element is a non-metal so it will form an ionic compound. The next step in naming an ionic compound, is to name each component as if they were ions. The first component is a cation so you leave the name alone. The second component is an anion, so you change the ending of bromine to "-ide" and it’s becomes bromide. The last step is to combine the names so, CaBr2 becomes Calcium bromide. The first element of the formula NBr₃ is nitrogen a nonmetal,…

of this investigation is to investigate how changing the temperature of sodium thiosulphate affects the rate of reaction in a chemical reaction. In order to complete this practical the temperature will be changed three times and the rate of reaction will be measured each time. Variables: Independent: -the temperature of the sodium thiosulphate. Dependent: -the rate of reaction. Controlled: - concentration of the sodium thiosulphate. - concentration of the hydrochloric acid.…