POST LAB QUESTIONS Develop hypotheses on the ability of oil, vinegar, and laundry detergent to contaminate groundwater. Oil hypothesis = Oil will not contaminate or change the amount of water filter. Vinegar hypothesis = Vinegar will contaminate through the soil allowing the water to filer through. Laundry detergent hypothesis = Laundry detergent will contaminate the soil by allowing the water to pass through. Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1?
2.2 Cleaning agents should be used to prevent infection and to follow any organisational policies and COSHH regulations. Cleaning agents include soap-based detergents and can be used for floors, walls, fixtures and fittings and persons. 2.3 Disinfecting agents generally include chemical detergents that are antibacterial or antiseptic and are used for the disinfections
What is a peroxide killer? After bleaching the cellulosic fiber with hydrogen peroxide, the fiber is subjected a thorough hot wash cold wash and neutralization processes. These operations would remove all superficially available chemicals that were used in bleaching process. However in practice it is found that the core alkali i.e. the alkali due to the use of caustic soda or soda ash and hydrogen peroxide, wetting agents and other auxiliaries would remain in the core of the fiber processed even after 2 or 3 washes.
It dehydrates sucrose (table sugar), C12H22O11, leaving a spongy black mass of carbon and diluted sulfuric acid. Concentrated sulfuric acid reacts similarly with skin, paper, and other animal and plant matter. When it is mixed with water, a highly exothermic reaction occurs, and the energy released can be enough to heat the mixture to boiling. Therefore, concentrated sulfuric acid has to be diluted by adding the acid slowly to cold water while the mixture is stirred to dissipate the heat. The first successful method for making sulfuric
Dip the slide into Eosin solution for 7 times and remove the excessive solution with a paper towel. 3. Dip the slide into new methylene blue for 9 times and remove the excessive solution with a paper towel. 4. Use the incinerator to allow it to dry completely.
Most differential stains have a challenge step that follows staining with a primary dye. In the Gram stain the challenge step is a rinse with either ethanol or acetone (either may be used). This step dehydrates and tightens the cell wall of Gram positives (mainly peptidoglycan) such that the rinse does not enter the cell. Gram negatives have mainly a lipid cell wall (even though they do contain peptidoglycan) that allows the challenge rinse to penetrate the cell and rinse out the crystal violet-iodine complex rendering the Gram negative cell colourless. Thus, the Gram negative cells must be stained to be seen, and this is done with the counter stain.
Tissue Papers Absorb Less Liquid in Volume When Concentration of Salt Increases This study was done in an effort to find out the minimum number of papers needed to wipe up a spill so that anyone could prevent wasting paper. In this investigation, sheets of tissue papers were dipped into salt water with different concentrations and soaked until the water traveled to the top, then the amount of water a paper absorbed in terms of both the mass and the volume was recorded. The result showed a strong, positive linear relationship between mass absorbed and salt concentrations, while it showed a slight decrease in volume absorbed with increasing salt concentrations. Further researches could be done to change the substances or even mix different solvents
| A colorless solution was formed after the addition of concentrated HNO3. | Concentrated HNO3 | - | 4 Mn2+ | Centrifuge the solution. | Deep purple solution was formed. | A slight excess of solid NaBiO3 | 2Mn2+ + 5BiO3- + 14H+→ 2MnO4- + 5Bi3+ + 7H2O | 5 Fe3+(2+) | Centrifuge the solution. | A light red precipitate was formed.
The lighter you go on the hair the more damage it inflicts on it. The chemicals you use to achieve a lighter look could make your hair dry, damaged, frizzy, and prone to breakage when trying to lighten hair. After lighting the hair if not kept up your hair can become dull and lack luster, brittle textured, unmanageable and tangled, may even fade or hyper-absorption. Those are some of the disadvantages of bleaching your hair. Ways of keeping a healthy look are shampooing hair less often, if possible.
Employees should be informed of the contents of the standard and its appendixes should always be available for inspection. The location and availability of the companies chemical hygiene plan should be visibly located or known to all employees. The permissible exposure limits given by OSHA for regulated substances showing their exposure limits should