True or false. A primary standard solid must be weighed accurately and diluted to an accurately known volume.

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: .is a method that can be ........ regarded as a top-down approach for nanomaterial production. * O…

A:

Q: 1. Benzoic acid sample weight, g 0.1702 2. Water volume used, mL 10.0 3. Methylene chloride volume…

A: Answer in 2nd step

Q: When checking the melting point of your impure sample, what temperature should you set as the…

A: In the event that the inexact temperature at which your sample should melt is known, the sample can…

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

A: ANSWER IS DISCUSSED BELOW :

Q: What are the physical states of dispersed phase and dispersion medium in foam rubber.

A: A phase is the state of a system. Phase can be solid, liquid and gas. When the solution forms…

Q: Give an example for the a β-diester

A: Given compound,           β-diester

Q: I have the first part but is the 2nd page going in the right  direction?

A: 6.The mass and moles of CoSO4 in 100g of hydrate is

Q: How is recrystallization of an impure solid accomplished?

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

Q: why do you calibrate thermometers and pipets?

A: Calibrate means correlate the result with standard instruments reading.

Q: What are the advantages and disadvantages of liquid-liquid extraction method?

A: Principal of liquid-liquid extraction method :

Q: liquid

A: ✓Eluent is the portion of the mobile phase, which carries the sample components with it. In liquid…

Q: This is the laboratory apparatus used for liquid-liquid extraction. Florence flask Volumetric flask…

A: For liquid liquid extraction is extraction of a particular compund from a solution with the help of…

Q: Data Sheet with Sample Results Note: results that require calculations are purposely left blank and…

A: Solution Mass of NaCl dissolved = (mass of beaker+stirring bar+NaCl)-(mass of beaker+stirring bar) =…

Q: What are pipeline slurry systems? How do they function?

A: Slurry is a mixture of solid in a molten state. It is denser than liquid and is mobile. The…

Q: Describe a method for determining the number of plates in a column?

A:

Q: The primary standard substance must be less equivalent weight (or molecular Wt. ) False True

A: Primary standard substance are used to standardized the secondary materials or solutions which is…

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: Carbon tetrachloride is highly combustible * true false O Option 3

A:

Q: Dilute

A:

Q: Determine the moisture content of the crystalline solid that weighs 4.8756g after staying in the…

A: The weight reduced on heating will give the amount of moisture content in the solid.

Q: Write the dispersed phase and dispersion medium of paints.

A: Colloidal solution contains two phase: dispersed phase and dispersion medium.

Q: Assessment 1 Direction. Write True if the statement tells correct information and write False if the…

A: #1: Alloys can be prepared in different methods. the most common method is given below:

Q: Red-Eared Sliders are illegal in California true or false?

A: true

Q: Weight of Crucible Weight of sample Weight of ash after incineration 15.254g 3.12g 0.18

A:

Q: 7) Describe how to prepare a dried sample fit for melting point analysis.

A:

Q: 24 The volume tric Karl Fischer method is suitable for samples with a high water content. 7…

A: THE ANSWERS ARE :-        (36) TRUE.          (37) FALSE.           (38) TRUE .             (39)…

Q: Closed-end and open-end manometers are shown. The change in height value corresponds to the…

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

Q: What is the role of collectors in Froth Floatation process?

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

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 is the tolerance na 100-ml volumetric flask? a. 10.16 ml O b. +0.40 mL OC. 10.05 mL O d. 10.60…

A: Volumetric flask is used in the measurement of volume of liquid for various purposes in…

Q: MGCO; fillers to PVC. True O False O

A:

Q: . What is the difference between temporary and permanent hardness?

A: Difference between temporary and permanent hardness :

Q: n is used in chemistry laboratory ass rod with bulb. 100

A: False . It is called as pipette  used in Chemistry laboratory.

Q: What parameters should be considered when choosing between distillation methods? Are there any…

A: Distillation is refining method of refining  by alternating evaporation and condensation to remove…

Q: 1. Moisture content dry basis (MC db) is the amount of solid per unit mass of dry solids present in…

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Among the requirements for a substance to be a primary standard is low hygroscopicity. A) True False

A: True.  Primary Standard should not absorb moisture from air. A substance that absorb or adsorb water…

Q: crucible and precipitate are dry?

A: For precipitate are dry:                        Pour the methanol into the crucible ,swirl gently ,…

Q: There are no different between volumetric and graduated pipettes

A: false  there is a difference between between graduated pipette and volumetric pipette graduated…

Q: Give the wet ) that work for ALDE HY DES only. chemical tests (#1-6

A: Chemical tests for aldehydes:

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: Mode of separation that uses a polar stationary phase: IEX HILIC SEC NPLC

A:

Q: what are the important hazards to know in gravimetric analysis? (please include pictures)

A:

Q: Why is the pipette more precise than a burette when measuring?

A: Burettes are larger than a pipette, it has a stopcock at the bottom to control the release of…

Q: What might happen to your melting points if you do not cool the MelTemp between runs? The melting…

A: The temperature at which the solid becomes liquid is called melting point.  Melting point is a…

Q: hv Solid 20-50 hr O. HHO TH 2HIO

A: Similar irradiation of naphthoic acid-derived cinnamic acid (A) in solid state on irradiation for…

Q: How do you weigh hydgroscopic samples?

A: Hydgroscopic samples contain moisture. Therefore it is measured in digital analytical balance.