TRUE OR FALSE __________ 11. The minimum number of centrifuge tubes in a centrifuge machine during its operation is one. __________ 12. Never place reagents directly onto the weighing pan of a balance, always use weighing paper, a beaker, or some other container. __________ 13. To transfer a solution, the stirring rod touches the delivery point of the reagent vessel and the wall of the receiving vessel. __________

Q: Br2, H20 c) DMSO (solvent)

A: .  IT IS  AN ADITION REACTION(HaloHydrin                    formation reaction)  .UNSATURATED…

Q: What are two characteristics of good recrystallization solvent for given compound

A: Recrystallization is the most important process to purify the non volatile solvent.

Q: A sample of galena is contaminated with zinc blend. Name one chemical which can be used to…

A: ANSWER IS DISCUSSED BELOW :

Q: Which apparatus is shown here: Select one: test tube rack Funnel Beaker O Pipette chemical reagent…

A: The above diagram indicates the chemical apparatus which is used to place test tube.

Q: Please draw out the apparatus illustration for normal distillation and key points in this process

A: Please find your solution below : The apparatus illustration of normal distillation process is as…

Q: Many reflux procedures involve a required length of time for the reflux to occur. When should you…

A: The time period should begin when the solution is not just boiling but actively refluxing in the…

Q: Give an example for the a β-diester

A: Given compound,           β-diester

Q: Mixing water and arterial fluid in the reservoir of the machine is called secondary dilution.  True…

A: mixture of arterial fluid  with water and /or supplemental fluids is called primary dilution.

Q: What is the best type of stirring device to use for stirring a reaction that takesplace in the…

A: Using basic concepts handling of instruments of laboratories.

Q: Add and subtract as indicated. Round off when necessary.a. (4.32 × 1 0 3 cm) - (1.6 × 1 0 6 mm)…

A: All number of digits in a number inclusive of the very last digit which has uncertain value is…

Q: What is the importance of loss on drying test?

A: Concepts of loss on drying test.

Q: Which solvent should be used to wash the solid material collected from a filtration? Select one: The…

A: The process which is used for the separation of solids from liquids or gases using a medium like…

Q: How is recrystallization of an impure solid accomplished?

A: Recrystallization is a technique used for the purification of a solid from impurities.

Q: Provide a table with molecular weights, boiling points, and density values for the starting material…

A:

Q: O Grinding would decrease the surface area and speed up dissolving O Grinding would increase the…

A: Grinding is the process of making bigger particles into smaller particles. That is, we will make…

Q: .Write any two safety measures he can follow while heating a solution in a test tube.

A: The safety measures can be follow while heating a solution in a test tube.

Q: An aerosol can should be stored in a cool place to prevent deformation of the can or an explosion.

A: Ideal gas law states that the product of volume and pressure is equal to the product of moles,…

Q: Do you use the bulb to help dispense the liquid from the pipette? Why or why not?

A: A pipette is used to accurately dispense the exact amount of a small amount of liquid like 10.00 mL,…

Q: ed Test This test has a time limit of 1 hour.This test will save and submit automatically when th…

A: Gibbs Free Energy -  Gibbs Free Energy can be most appropriately can be defined as the useful work…

Q: "Cold filtration" is used during recrystallization to: Select one: a. Remove insoluble impurities O…

A: Cold filtration is the rapid filtration where solution is cooling then filtrate. When the solution…

Q: The purpose of fluting filter paper.

A: fluting filter paper when performing a gravity filtration it means folding a filter paper to give a…

Q: wet gum and dry gum method, what apparatus is use to triturate the emulsifier, oil and water?   a…

A: An emulsion can be defined as a mixture of two or more than two liquids that are immiscible with…

Q: What is catalytic Incinerator?

A: An incinerator is an important equipment of burning wastes. They are generally used to dangerous…

Q: Filter paper can be added to the developing chamber to help saturate the chamber with solvent vapor.…

A: Answer: True Thin-layer chromatography is a technique for separating a sample into its component…

Q: Fill in the following blanks that describe using sodium sulfate for a drying agent: Sodium sulfate…

A: Sodium sulphate like drying agent are used to remove water. They can absorb water from organic…

Q: Many reflux procedures involve a required length of time for the reflux to occur. When should you…

A: Given: Many reflux procedures involve a required length of time for the reflux to occur.

Q: Why is it important to condition a pipet before use?

A: The important condition to use pipet for experiment is to rinse it thoroughly with a solution to get…

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A: To perform experiments in laboratory various instruments are used. Following is the table mentioning…

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A: Manometers are used for measure pressure of gas in closed container. There are two types of…

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A: Various processes are used for extraction of minerals. These minerals are very useful for…

Q: What is reflux and what is it used for?

A: In a chemical reaction when vapor produced under heating will get condense and return back to the…

Q: What type of elution uses different proportions of solvent during separation process?

A: Elution is a process of separating one from a mixture by using eluent or solvent. By solvent…

Q: What substances did not pass through the filter paper?

A: The process of separation of a solid substance from the liquid is known as filtration. It can be…

Q: Vacuum distillation is useful for thermally unstable compound. False True

A: vacum distillation is not useful for thermal unstable compounds.

Q: What is jig and fixture? If you are working in a production company, what are the…

A: Interpretation-  Tell about what is jigs and fixture. If you are working in a production company…

Q: Use the dropdown menus to indicate the proper sequence of steps required in the use of a volumetric…

A: The proper sequence required in the use of a volumetric pipet is given by, Step-1: Rinse the pipet…

Q: Sample process flow showing production of ethanol from molasses

A: production of ethanol from molasses. Sugarcane molasses is a by-product of sugarcane products that…

Q: LESSON C ONCEPT Another method of separating mixtures is sieving. It is a simple technique for…

A: Since you have posted a question with multiple sub-parts, we will solve the first three subparts for…

Q: What will happen when the condensate reaches the thermometer bulb? Why does that happen?

A:

Q: To avoid drawing air bubbles into your pipet, you should. Select one: Use a pipet bulb instead of a…

A: Pipet is an appratus that is used to take the desired volume of the liquid It is most common used in…

Q: What should we use d) To hold a very hot crucible: _________________ e) To hold test tubes so that…

A: (d) Crucible is an apparatus used to heat Chemical materials over burner or inside of over , where…

Q: Watchglass Bent glass hook Arrangement for the drying of samples. It shows the recommended way to…

A: false, as the reagent is not covered the lid of the bottle as well as the beaker beak is open…

Q: Melting point start 54 and stop 59. was your product pure?

A: Melting point is the physical property of the organic compounds. It is defined as the temperature at…

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A: Safety tips for pipette: Do not use the mouth for pipeeting out, otherwise you will be swallowing…

Q: Which one hardness type that remain after boiling process. O Temporary hardness. O Permanent…

A:

Q: round bottom flask A. Attached to the y-tube (distillation head) using a Keck clip, and is filled…

A: Given is , laboratory apparatus and their functions.  Let's match them .

Q: Using chemicals to restore obliterated identifiers on firearms, tools, vehicles, boats, etc. is…

A:

Q: Table 12.1 cont. These photos are a collection of four photos showing the results of flame tests…

A: Different salts give different colored flames when they are put in a flame. As every salt has a…

Q: A lower and/or broader melting point range for a compound after recrystallization most likely…

A: The temperature, at which the physical state of the substance changes from solid to liquid, when the…

Q: Materials: Wash Bottle Stirring Rod Desiccator Burette/Buret Pipette/pipet Volumetric Flask…

A: A chemistry lab contain a lot of materials other than the chemicals for carrying the reaction…