Solid

discovery of mycobacterium tuberculosis, which proved the idea that tuberculosis was not an ‘inherited disease’ (as it was thought at the time) but a bacterium, and was infectious (a scientist named Villemin demonstrated its was contagious but had no solid evidence to back him up). To prove that his theory was correct, Koch used a test which he had devised in his study of anthrax (now) called ‘Koch’s postulates.’ He used guinea pigs to evaluate these postulates on, as they required a host…

their melting points) and it would have lowered the percent recovery in the organic solution. Additionally another error that could have attributed to a lower percent recovery was if the experimenter lost some of the solid while transferring it to the scales. If some of the solid was lost, it would have caused there to be a decrease in the amount…

Forces examination recognizes the outer elements that present the effect of firms on each other. The solid power of focused competition against Unilever depends on the accompanying outer elements and their powers • High number of firms • High aggressiveness of firms • Low switching costs There are numerous organizations working in the customer merchandise industry. This outer factor forces a solid power on Unilever. Also, these organizations are by and large forceful, additionally adding to…

reasoning for your argument. Is the topic important enough to warrant a full paragraph? No, I do not think the topic is important enough to warrant a full paragraph because it does not have a solid argument. Adding more reasoning to why you are arguing this would improve this paragraph. Does the paragraph utilize solid, strong evidence? The second body paragraph provides evidence. You may want to add some stronger evidence with details to support it. What does the paragraph do well? What…

HCl. Keep the solution in ice water bath. Part II: Preparation of the diazonium ion Take 5.5 g of p-toluidine into a 100 mL conical flask and add 8 mL water and 6 mL Conc. HCl to it. Stir the solution and heat it until the solid dissolves. Now add 6.5 mL of HCl to this solution. Cool thoroughly in an ice-water bath. In a separate beaker, make up a solution of 3.7 g of sodium nitrite in 10 mL of water. Take a small beaker and weigh out about 5 g of ice and pour it into…

if a Chemical Change is occurring you need to determine whether a new substance has formed because of the change. If a new substance has been produced, then a chemical change has occurred. The new substance formed in a chemical change could be a solid, liquid or gas. it talks about how chemical changes make new substances and it also describes how you can see or observe if a new substance is made .You can detect the presence of a new substance by: seeing a change in colour, smelling a gas…

2.1.1. CAPILLARY ACTION Liquids are able to flow opposite to the direction expected from gravity; this is caused by the capillary action. Capillary action arises from a combination of surface tension and adhesive forces between the liquid and the solid. The difference in intermolecular attraction in the liquid and adhesion…

To carry out the experiment we need to get caffeine into a solution. We used a solid-liquid extraction by adding 14 tea bags into a 1L beaker with 6g of sodium carbonate, 250 mL of tap water and bringing this to a boil for five minutes on a hot plate. Sodium carbonate is a weak bronsted base, that neutralizes tannic acids extracted from tea, that interfere with the later sublimation operation.(1) We turned the heat off after five minutes, added ice cubes to cool the mixture to room temperature…

Co-crystal is a new solid form consists of a single crystalline phase of several components in a certain stoichiometric ratio, where different types of molecules that interact with hydrogen bonds or other non-covalent bonds [12]. The pyridine ring in their chemical structure…

soluble [1]. When then checked the pH of the solution by using pH strip. The solution had a pH>7. Then we did an anion test and discovered the compound reacted with chloride by producing a white precipitate. The precipitate that formed was an insoluble solid because Cl of NaCl reacted with Ag of AgNO3, creating a Cl- ion above the aqueous solution [3], results on Table 2. Finally we used a cation flame test, results on Table 4. When we burned the unknown substance the flame was a bright…