Why must alcohol be diluted with water to about 70 % percent before it could be used as an effective disinfectant. What is the chemistry behind it?

Q: can the same chemical be used for an antiseptic and a disinfectant?

A: Antiseptic - These can slow down the growth as well as can kill the microbes, but do not harm the…

Q: Of the two principal polymers used in column chromatography and electrophoresis, which one would be…

A: The column chromatography procedure is used to separate a single chemical compound from a mixture.…

Q: Why can’t nitric acid stains be removed by washing?

A: Nitric acid: it has the chemical formula HNO3. It is a conjugate acid of nitrate and a protic…

Q: How can we make soap?

A: Soaps are the salts of fatty acids. Soaps are generally used as surfactants for washing cloths,…

Q: what is the difference between sterilizer , disinfectant & surfactant ?

A: There are thousands of microorganism present in the environment. Most of them are harmful to the…

Q: Why Purified synthetic alcohol is preferred for level vial?

A: An alcohol is an organic compound that carries at least one hydroxyl functional group (-OH) bound to…

Q: A powdered complex medium can be stored for months in the lab. However, after rehydrating the medium…

A:

Q: What is the most efficient disinfectant of the following ( Alcohol, chlorine, soap ,hijyn), and…

A: Disinfectants are chemical agents that are built on inert surfaces to inactivate or kill…

Q: Why is it necessary to flame the top of the bottle before pouring the plate?

A: Aseptic techniques are used to prevent contamination from pathogens. These are used in clinics and…

Q: Why does a surgeon use sterile distilled water rather than sterile isotonicsaline to irrigate a…

A: Sterile distilled water comes under the category of hypotonic solutions. When our cells are kept in…

Q: What purpose does water serve in the “Effects of Antiseptics & Disinfectants”?

A: Answer:  ANTISEPTICS : These are the liquid or semi-solid cream having some special properties to…

Q: Many antibacterial hand soaps contain the chemical agent _____ , which belongs to the _____…

A: Sodium hypochlorite is commonly used chemical agent in mildew remover for prevention of infection…

Q: Why would hydrogen peroxide be an effective disinfectant?

A: We have to answer why hydrogen peroxide can be an effective disinfectant.

Q: Distinguish between a sterilant, a disinfectant, and anantiseptic. What is cold sterilization?

A: The human environment is filled with microorganisms. These tiny organisms are found everywhere on…

Q: reaction of litmus paper to vegetable oil (acid -bases)

A: Litmus paper is a special type of paper which is used to determine the pH of an aqueous solution.…

Q: Why are proteins and amino acids considered to be natural buffers?

A: Buffer is a solution that resists the pH change when an acid or base is added to it. pH is measured…

Q: how many minute does it take a sugar to dissolve in hot water?

A: Sugar dissolves more quickly in hot water than cold water because of kinetic energy of particles.…

Q: Why efficascent oil is green liquid?

A: Efficascent oil is a liniment for the treating pains associated with muscles and joints. It is…

Q: Why is 80% alcohol the recommended solvent For the preparation of plant extract?

A: Different plants have different properties due to the differences in their chemical composition,…

Q: What are high level disinfectants? What is an example of one? What is the method of action and the…

A: Disinfectants are chemicals that are used to kill the microorganisms present in the surroundings.…

Q: نقطة واحدة the solvent in recrystallization * should not be dissolve the compound to be crystallized…

A: We are authorized to answer one question at a time since you have not mentioned which question you…

Q: Why is it important that the agarose is exposed to ethidium bromide, which is either added to the…

A: Ethidium bromide is utilized during separation of fragments of DNA by agarose gel electrophoresis.…

Q: Given the following common laboratory materials, which of the three methods of heat sterilization do…

A: Sterilization is the used to kill the microorganisms or other pathogens from a substance or…

Q: What are the different types of disinfectants? How is each one different or similar from the others?…

A: Almost every environment on the planet contains bacteria and microorganisms. In fact, on one square…

Q: Why is it necessary to know the accurate proportion in mixing bleach and water in cleaning and…

A: Bleach is a strong disinfectant.  It has a active ingredient sodium hypochlorite; an effective…

Q: What is the difference between an antiseptic and a disinfectant? Can the same chemical be used for…

A: Antiseptic Disinfectant 1.       These can slow down the growth as well as can kill the…

Q: What is one advantage of a pour plate over a streak plate?

A: The pour plate method is a technique used to count the number of colony-forming bacteria found in a…

Q: what does it mean if a pigment (let' say 'yellow') traveled beyond the solvent front in paper…

A: Paper chromatography is the process of separation technique which involved in speraration of…

Q: Of what practical importance are air borne microorganisms to the laboratory workers?  What…

A: Questions related to the microbiology labs.  Note: each questions are answered under particular…

Q: Why are most antimicrobial chemical agents disinfectants rather than sterilants? What general…

A: Most chemical antimicrobial agents are disinfectants instead of sterilants. A disinfectant reduces…

Q: Explain the chemical nature of soap - is it hydrophilic or hydrophobic (or both)?

A: Soap is a mixture of sodium salts of various naturally occurring fatty acids. The soap is produced…

Q: Which of the following are solutions?(a) Italian salad dressing(b) Rubbing alcohol(c) Algae in pond…

A: The term mixture in chemistry is defined as a material. It is made up of two or more different…

Q: You are working in a hemodialysis clinic and have just received a shipment of dialysate solution.…

A: Answer:  DIALYSATE SOLUTION = This is the solution of pure water , electrolytes , and salts used in…

Q: Can we use maceration to extract volatile oils? why or why not?

A: Plants produce volatile oils, which are odorous natural compounds. They are in charge of the…

Q: How might a synthetic detergent be superior to a normal soap?

A: INTRODUCTION - Soaps are  sodium or potassium fatty acid salts made from hydrolysis of fats in…

Q: Why do we add powdered zinc to the nitrate reduction test?

A: Bacteria are prokaryotic simple unicellular organisms. Their mode of respiration may be aerobic or…

Q: What is the difference between an antiseptic and a disinfectant?

A: Antiseptic and disinfectants are used to kill germs, bacterias which attack from outer environment.…

Q: Why does Alka-Seltzer foam and bubble when dissolved in water? Which ingredient is the antacid?

A: Alka- Seltzar is a type of medicine which is used to cure indigestion, stomach pain or upset…

Q: What is the process and principle behind isoelectric precipitation?

A: Isoelectric precipitation is a type of isoelectric precipitation that occurs when: The pH of a…

Q: In keeping a bottle of vegetable oil with no preservative, it must be coveredtightly and…

A: Triacylglycerols are lipids present in oils that have a glycerol backbone with the three hydroxyl…

Q: What physical factors can influence the activity of a disinfectant

A: Introduction- Disinfection is the process by which we can eliminate the growth of microorganism…

Q: What are detergents?

A: Introduction:- Detergents are amphipathic compounds with charged hydrophilic or polar groups at the…

Q: Dilute silver nitrate is sometimes applied to the eyes of newborn infants. Explain why a dilute…

A: Eye is an organ which helps us to provide vision it has several photoreceptors which receives light…

Q: Agar is a solidifying agent used in media preparation. How and why does the agar concentration in…

A:

Q: What is the basic purpose of the paper chromatography?

A: Chromatography is an important analytical method used to separate a mixture of chemical substances…

Q: Please explain why is 70% ethanol used as an effective disinfecting solution in labs? Why not 95%…

A: Only 70% alcohol is effective as a disinfectant that is killing the microorganism on the surfaces.…

Q: Suppose you have an initial chlorine concentration of 5%. Then out of that, you are told to prepare…

A: The concentration of a solution: The concentration of a solution is defined as the amount of the…