Which of the ff is not true about recrystallization? a. acetanalide recrystallized only at cold temp b. congo red stain is removed by using animal charcoal c. acetanalide can be dissolved in hot h20
Q: Select among the following series of univalent cations an ion with the highest coagulative power…
A: The coagulation power of cation increase with increasing valency of cation this is called Hardy…
Q: A – Assertion and reason both are correct statements and reason is the correct explanation for…
A: Aldehydes can be defined as the organic compounds that contain CHO group attached to carbon atom in…
Q: IR Spectrum (quid film) 4000 100 8282& 80 60 40 20 % of base peak 3000 43 40 13C NMR Spectrum (500…
A:
Q: INSTRUCTION: There is no underlined word. Pick the word to be changed to make the statement true.…
A: Given statement is : Nucleophilic aromatic substitution on the benzene ring is possible because of…
Q: QUESTION 14 Consider the reaction scheme below. Compound E PBr3 KMnO4/ H* + HCN Compound A Compound…
A:
Q: When an aqueous, neutral NiCl₂ solution is electrolyzed with 20 dc voltage, Cl₂ gas is the primary…
A:
Q: 0.369 mol of a weak base (pKb = 5.52) is added to 0.298 mol of the salt containing its conjugate…
A: Buffer solution has tendency to maintain constant pH upon addition of small amount of acid or base.…
Q: Ethylene glycol freezes at -5 deg C in water. What is the boiling point of the solution?
A: Given→ Freezing point of ethylene glycol in water = -5 deg C. We have been asked to find…
Q: Chemistry For 2g of 150ml of CaBr2 Find and show work for: 1. %mass/volume concentration 2. Molarity…
A: Let us have another combination molecule = CaBr2 , Mass = 1 g , Volume of solution = 150 mL The…
Q: At what position, and on what ring, would you expect the following substances to undergo…
A:
Q: Solution :- Reactant-1 Potassium carbonate - Concentration (c) = 0·200 M = 0.200 mol/L Volume (V) =…
A:
Q: What is an evaporative-light scattering detector in chromatography?
A: An evaporative light scattering detector (ELSD) is a detector used in conjunction with…
Q: In the following reaction represented by the net ionic equation, the rate of reaction of CN– is…
A:
Q: H₂C CH₂ Show how the compound can be synthesized from benzene and alkyl chlorides.
A: Here we have to synthesize the following given compound from the starting material benzene and alkyl…
Q: Sample A: Sample B: Sample C: Sample D: Sample E: Sample F: 22mm 18mm 35mm 30mm 28mm 28mm 21mm 17mm…
A: Since the units are in mm, this means we are taking about some distance, length or height.
Q: 4. Why do you suppose a mixture of ethanol and water instead of simply water itself is used for…
A: Saponification reaction involves the reaction of hydrolysis of triglyceride Eester of fatty acids…
Q: Several chemical tests were carried out on an unknown compound to determine its identity. The…
A: 1. Iodoform is used to find the presence of carbonyl compounds with the structure R-CO-CH3 or…
Q: 11. It is impossible to convert heat completely into work in a cyclic process. 12. Work can be equal…
A: Since you have asked a question with multiple sub-parts, as per our company guidelines we are…
Q: Give the 9) (b) of the name Compounds given below LOH 애
A: Write IUPAC name of the given structure---
Q: Q. HOW IS THE ATTACK OF MILD ACIDIC ENVIRONMENT ON ACID,BASIC, AND NEUTRAL REFRACTOTRIES.
A: A question based on materials that is to be accomplished.
Q: A 1cm thick transparent material have a fraction of non-reflected light transmitted of 0.87. What is…
A:
Q: 3. An electrolytic cell is used to plate silver from a silver nitrate solution unto an electrode.…
A:
Q: ASSER Alkyl aldehydes are less reactive than aromatic aldehydes, such as benzaldehyde. REASON: The…
A: The answer is as follows:
Q: H₂C CH₂ Show how the compound can be synthesized from benzene and alkyl chlorides.
A:
Q: What is the effect of mobile phase on each (known) sample when doing Gas Chromatography?
A: The detailed solution of the given question is as under. The concept used here is from…
Q: A radioactive substance decays at a rate proportional to the amount present. If 45 percent of a…
A: Given : Time (t) = 20 years Percentage of substance decays = 45 %
Q: Write down three differences between GC and HPLC (GC = gas chromatography) (HPLC =…
A: 1. High Performance Liquid Chromatography uses a liquid mobile phase and gas chromatography uses a…
Q: Use the following chemical equation to answer the questions below. Fe (s) + 2H¹ (aq) = H₂(g) + Fe²+…
A: This problem can be explained by Le Chatelir's principle . Le Chatelier's principle can be stated as…
Q: Why does water often cause changes to various experiments?
A:
Q: The Ksp of CaCO3 at a certain temperature is given to be 7.3 × 10-9. What is the molar solubility…
A:
Q: how many more grams of KNO3 will still dissolve in a solution of 20 grams of KNO3 at 20°C?
A:
Q: A solution of 0.25 M potassium hydroxide, KOH is added from a burette to a flask containing 25.0 mL…
A: For given pH curve , incorrect statement is to be determined,
Q: Please explain step by step. ** Electrolysis 4. Sketch a cell for the electrolysis of aqueous HCl…
A: The process of electrolysis is the opposite of an electrochemical cell reaction, in which a…
Q: Please help Please find the limiting reagent using the information in the photo Please show your…
A: Given,20 mL of 0.200 M CaCl2 . 2 H2O20 mL of 0.220 M K2CO3Required, The limiting…
Q: In the reactions given below when HCI and HBr were added, what rule is best describe them.…
A:
Q: One component of sour milk is lactic acid (HC₃H₅O₃). What is the pOH of 0.30M lactic acid? (Ka =…
A:
Q: NH₂ Pentan-2-amide Pentan-2-amine Butan-2-amide O 1,3-dimethyl propanamine Choose the correct IUPAC…
A: In order to write iupac name we have to follow some rule 1.select longest carbon chain including…
Q: 2. What charge, in coulombs, is required to deposit 1.5 g Cu(s) from a solution of Cu(aq)? (F-96480…
A: Known Cu2+ (aq) + 2e- →Cu (s) Weight of Cu deposits = 1.5 g Atomic mass of Cu = 63.55 a.m.u. F…
Q: What is the pH of a 0.712 M weak acid solution that has a Ka = 4.5 x 10-9?
A: Weak acids dissociate partially. So we have to calculate degree of dissociation first and then pH.
Q: A 2.89 g sample of limestone (CaCO3) was dissolved in 0.12M (HCI) solution according to the…
A: " Since you have posted a question with multiple sub-parts , we will solve first three sub-parts for…
Q: What is the half-life of a radioactive substance if after 5 years 95 percent of an initial amount…
A: Half life of a given radioactive substance is that time duration in which it's amount reduced half…
Q: (j). An acetate buffer contains 50.0 millimolar (mM) acetic acid and 35.0 mM sodium acetate. (i)…
A: Here we are required to find the pH change when acid and Base are added to the buffer solution
Q: Specific (J/g °C) Metal Heat Calcium 0.647 Iron 0.449 Silver 0.235 Gold 0.129 After absorbing 0.500…
A:
Q: e. The heat q for an irreversible change of state from state 1 to 2 might differ from the heat for…
A: To show that , given statements are true or False
Q: Q1. Draw phase diagram of soil and what is formula of water content?
A: Phase diagram of soil.
Q: At what position, and on what ring, would you expect the following substance to undergo…
A: Aromatic electrophilic substitution reaction: Aromatic electrophilic substitution reactions are the…
Q: 4. The americium isotope Am is unstable and emits a 5.538 MeV alpha particle. The atomic mass of Am…
A: #4: An alpha particle, He24 has 2 protons (Z = 2) and 4 unit mass. Hence when an alpha particle,…
Q: If [Cu] concentration in a river is 43 ppb, what is the molar concentration? (Cu=63.546 g/mol) O…
A: Considering this, for the conversion from ppb (m/v) to M, first we need to say that ppb means 1 part…
Q: What is the IUPAC name for the molecule below? CH, CH₂NCH, T CH,
A: The IUPAC name of above amine derivative compund is N,N-Dimethylethanamine
Q: What is the molar solubility of Ca(OH)2? Ksp = 8.0 x 10-6
A:
Which of the ff is not true about recrystallization?
a. acetanalide recrystallized only at cold temp
b. congo red stain is removed by using animal charcoal
c. acetanalide can be dissolved in hot h20
Step by step
Solved in 2 steps with 1 images
- Thiamine is assayed by? I. Spectrophotometry II. Fluorometry III. Turbidimetry A. I, II and III B. I and II only C. II only D. I onlyTEST/REAGENT EXPERIMENTAL OBSERVATION A. Orcinol a. Brick red precipitate B. Benedict's test b. Magenta solution C. Ammoniacal silver nitrate c. Colored complex D. FeCl3 d. Red to blue litmus E. C6H5SO₂Cl, excess NaOH e. Blue green compound F. NaOH, H₂O, heat f. Decolorization G. t-butyl chloride/ AICI3 g. Liquid residue (lower layer) Silver mirror H. Br₂ in water, dark h. I. NH₂OH-HCI, KOH, FeCl3 i. Orange to red crystals J. Resorcinol Red condensation product Orange precipitate K. 2,4-DNPH k. L. lodoform test I. Yellow solution m. Yellow precipitate Given the following reagents and tests above, what could best differentiate the two compounds below? Provide also the letter of the expected experimental observation and state which of the two would give positive result. i تر j. "NH₂Propan-1-ol has a higher retention time than propan-2-ol on a reverse-phase GC column because Select one: a. The b.p. of propan-1-ol is greater than that of propan-2-ol. b. Propan-1-ol has greater hydrophilic interactions with the mobile phase than propan-2-ol. c. Propan-1-ol has a greater affinity for the mobile phase than propan-2-ol. d. Propan-2-ol has greater hydrophobic interactions with the mobile phase than propan-1-ol. e. Propan-1-ol has a greater affinity for the stationary phase than propan-2-ol.
- Based on the following samples, which have positive result with iodoform test? Explain. a. Acetaldehyde b. Benzaldehyde c. Acetone d. Acetophenone e. Isopropyl alcoholWhich fraction or extract is/ are positive for Guignard test? A. Aqueous fraction B. Hexane C. Ethyl acetate D. DCM1. Which of the following can most likely increase the yield of recrystallized benzoic acid? a. A fluted filter paper was used during cold filtration. b. The receiving flask from hot filtration does not contain a small amount of solvent. c. Activated charcoal was not added to the solution. d. The solution was filtered immediately after hot filtration.
- Kiko, a Chem 31.1 student, accidentally shuffled two test tubes with different compounds on his way to the laboratory. To confirm the possible identities of the compounds, Kiko added neutral KMnO4 and Lucas reagents to both test tubes labeled A and B. Test tube A gave a brown precipitate in neutral KMnO4 while test tube B produced a purple solution in the same test. Upon subjecting to Lucas Test, both test tubes produced layers. Which of the following are the possible identities of the compounds A and B? a. Sec-butanol and 3-methyl-3-pentanol b. n-propanol and tert-butanol c. isopropyl alcohol and 4-nitrophenol d. hexanol and cyclopentanolAmong the three solvents used in the separation of pigments in spinach, which produced the most effective separation? Explain your choice. a. hexaneb. 70:30 hexane:acetonec. 50:50 hexane:acetoneWhich of the following mixtures can be efficiently separated by simple distillation? a.) H2ONACI B.) CH3OH / H20 C.) CH3CH2CH2CH2CH2CH3 and CH3CH2CH2CH2CH3 D.) CH3COCH3 (acetone) and CH3CH20CH2CH3 (diethyl ether)
- Why does Naphthalene elute last in 95 percent Polydimethylsilicone and 5% phenyl-methyl silicone gas chromotagraphy system as compared to phenol and toleune(where toluene elutes first than phenol)1.What is the significance when KD is either a small or large value? 2. Methyl alcohol and ethyl alcohol are poor extraction solvents. Why?3. What is the major disadvantage of using ether as an extracting solvent?Which of the following observations is INCORRECT? a. 4-aminophenol: wine red solution in FeCl3 b. Phenol: white precipitate in Br2 in water c. 3,5-dimethyl-1-hexanol: No layer formation in Lucas reagent d. 3,6-dihydroxycycloheptanone: decolorization of solution in KMnO4 test