Discuss common sample preservation methods or storage conditions that would ensure sample stability during transportation and in the laboratory

Q: Gas chromatography would NOT be appropriate to use for a sample that is decomposed by heat a mixture…

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Q: Will the molecular weight of the sample be more or less than the correct molecular weight if the…

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Q: Consider the following chromatogram.     The early eluting peaks and later eluting peaks exhibit…

A: Students will most likely not think of solutions on their own. Remind them of variables that…

Q: A 25 g organic substance was purified using recrystallization. Amount recovered after…

A: Sublimation is the conversion of a substance from the solid to the gaseous state without its…

Q: About Gravity, tick only the incorrect alternative(s), choose one or more: a) In gravimetric…

A: Gravimetric analysis is a technique used in inorganic labs to determine the amount of analyte…

Q: 64. This process of separation is called O recrystallization process O sublimation process O…

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Q: A student is asked to prepare 45.0 mg of a sample to be used in a mixed melting point test. The…

A: Given, Mass of the sample needed to be prepared = 45.0 mg % of A in the sample = 65.0 % % of B in…

Q: Describe how to weigh hygroscopic solids

A: Answer - Hygroscopicity - Hygroscopicity is the tendency of a solid substance to absorb moisture…

Q: mass

A: Mass spectrometry serves as an exceptionally useful method in the field of forensic drug analysis,…

Q: 1a. Throughout the experiment, what are some possible sources of error that could have led to…

A: A question based on tools in analytical chemistry that is to be accomplished.

Q: Area or Field Medicine ommunication Consumer Product Some Chemical Components (Chemical Formula) Use…

A: Consumer Product  Consumer products are those that are purchased by the typical customer for…

Q: Which practice is NOT used to gauge accuracy? raw data and results from calibration checks B.…

A: Accuracy is used to determine whether given results is close to true value and it is free from…

Q: Which statement is true?   Statement 1: Melting point and boiling point can be used to identify…

A: Melting point The temperature at which Solid is converted to Liquid is called as melting point .…

Q: Will the sample be contaminated with any of the impurities? Calculate the percent purity of the…

A: Solubility is defined as the mass of solute present per mL of solvent at a specific temperature. Its…

Q: After heating 2.000 g of MgSO4.7H2O to constant mass, the remaining residue in the crucible weighs…

A: Mass of salt before heating = a = 2 gm Mass of salt after heating = b = 0.978 gm Mass of water =…

Q: Low of constant composition

A: In this question, we will see the defination of Law of constant composition and it's example.  You…

Q: What are the proper steps to use a mass balance?

A: Paper, Sheet or any sample container is used for the measuring the chemical sample.

Q: Explain the reason why a laboratory analyst should not return excess or unused chemicals back in…

A: Excess reagents should not be returned to its original Reagent bottles because it might be…

Q: A gas chromatograph can be used to (more than one answer may be correct) O purify large quantities…

A: Gas chromatography is a technique based on the differential partitioning and migration of components…

Q: What type of balance are you going to use if you are weighing a sample for sample analysis? Explain…

A: A question based on analytical process that is to be accomplished.

Q: Crude Substance Sublimate Wt. container + sample, g Wt. container, g Wt. sample, g 23.5 22.2 18.4…

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Q: what are refractory materials?

A: Materials that are inorganic non-metallic materials are called refractories.  They can withstand…

Q: Explain the reason why a laboratory analyst should not return excess or unused chemicals back in…

A: Chemicals have their chemical property change upon contact of oxygen. The glassware used for…

Q: Importance

A: Water sampling is very important for the correct outcome of water analysis. Using the correct…

Q: Several steps can be done in preparing samples for analysis with high moisture content except…

A: Here, we have to find the step that can not be done in preparing samples for analysis with high…

Q: What section in the SDS is used as the source of information for proper chemical labeling? Select…

A: A question based on environmental pollution that is to be accomplished.

Q: Discuss some applications of simple distillation and steam distillation. Explain why you can use…

A: In distillation process liquid is converted into vapour and then condense to liquid form .

Q: Which practice is NOT used to gauge accuracy? raw data and results from calibration checks B.…

A: Correct option is (e) sample rejection .

Q: Determine each statement if it describes dissolution or disintegration.   It is mainly affected by…

A: Dissolution means the disove of substances in different solvents. It is applicable for solids,…

Q: This type of analysis implies that the constituent determined was present in very, very low…

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Q: Information about a Water Sampler

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Q: The following are requirements for primary standards, EXCEPT O composition vary with drying stable…

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Q: amount of heat lost with respect to time the composition with respect to time amount of heat lost…

A: Relationship generated in a cooling curve:

Q: A substance with a molar mass of about 120 and containing only carbon and hydrogen; δ= 1,2 one in…

A: Introduction: Spectroscopic methods are useful for the structure determination of a compound.IR…

Q: How does analytical chemistry help in forensic science?

A: The way how analytical chemistry help in forensic science has to be given,

Q: what are the possible errors that could be encountered during the analysis?

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Q: Identify two (2) possible errors during weighing a sample.

A: Weighing balance is the key instrument used in any chemistry laboratory. Slightly handling issue of…

Q: bioassay tests.

A: The question uploaded by you is multiple questions. According to the guidelines, if there are…

Q: I need help finding the %Composition for %cychohexane and %toluene. The formula (area of peak/total…

A: To determine: % composition for Cyclohexane and toluene

Q: When we need sample preparation for analysis? use your own words to explain

A: Given :  To explain a need of sample preparation for analysis.

Q: What is polarity and how is polarity related to how chromatography works?

A: In chemistry, polarity of a molecule is defined as the electric charge distribution over the atoms…

Q: 6. Explain the reason why a laboratory analyst should not return excess or unused chemicals back in…

A: 6) Answer - According to the question - The reason why a laboratory analyst should not return excess…

Q: Explain if it is possible to combine different types of mass analyzer.

A: Mass Analyzer: It is the center of the mass spectrometer, which takes ionized loads and disparate…

Q: David decides that it is better to create a blend containing 50% NaCI, 33% KCI and 17% CaCl2, than…

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Q: Mixtures and Pure Substances Lab Data Sheet Discussion Questions: In the space provided for each…

A: Given : mixture and pure substances Lab report.  To find : Complete sentence of response. Note :…

Q: True or False? Why? In ion chromatography a single column containing ion exchange resin allows…

A: Now a days ion exchange chromatograpy is one of the best tool used in various field of science for…

Q: What is silazation ?

A: Silanization is the covering of a surface with organofunctional alkoxysilane molecules.

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".