Phenolphthalein is added to a certain mixture. When the mixture was heated, the color turned pink. Which of the following is most likely the certain mixture? Ca2+ + 2 OH- ⇄ Ca(OH)2                    ΔHrxn = +2.5 kJ/mol H+ + OH- ⇄ H2O                                  ΔHrxn = -55.85 kJ/mol Both/None of these

Q: A 0.3005g sample containing Na2CO3 and NaOH requires 11.5 mL of 0.1055 M HCl to reach the…

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Q: 47. Of the elements shown in the Periodic Table, which is the most reactive? * III IV V VI VI| Ne I…

A: 47. We need to determine most reactive element.  48. We need to tell the non metal in group 1.  49.…

Q: The following are spectrometric methods of analysis, except   A. MS   B. NMR   C. Polarimetric…

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Q: A sample of neon gas oCcupies a volume of 752 ml at 25°C. What volume will the gas occupy at 50ºC if…

A: Given : Initial Volume = 752 mL ×  1L / 1000mL                                       = 0.752 L  = V1…

Q: What pressure is exerted by 0.75 moles of a gas at 25°C in a container with a volume of 1.5 L?

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Q: Question 14 of 16 Submit Which of the following is the correct expression for the pressure based…

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Q: A chemist dissolves 692. mg of pure hydroiodic acid in enough water to make up 60. mL of solution.…

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Q: QUESTION 9: Metals react with oxygen gas to form metal oxide. For example, magnesium reacts as…

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Q: How would you convert the following compounds to aromatic compounds? (a) (b) (c) CI (d) (e) (f) HO-…

A: According to Huckel , Aromatic species can be explained using π electrons calculation along their…

Q: Given the following reactions: Anode: NO3- + 2H+ + e- --> NO2 + H2O Cathode: 2H+ + 2e- --> H2…

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Q: Given the following reactions: Anode: NO3- + 2H+ + e- --> NO2 + H2O Cathode: 2H+ + 2e- --> H2 Redox:…

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Q: The pH scale is a measure of:   a. Relative concentration of a solution.   b. Relative acidity of…

A: pH is defined as negative logarithm of hydrogen ions dissolved in water.

Q: What is the activity coefficient for each ion at the given ionic strength at 25 °C? Activity…

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Q: 2. What are the n, I, and possible m, values for the 2p and 5f sublevels?

A: 1) 2p sublevels n = 2

Q: One microliter of 0.20 μg/mL0.20 μg/mL benzene is injected into a gas chromatograph using splitless…

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Q: property of acids?   a. tastes bitter   b. turns blue litmus red   c. forms hydrogen gas with…

A: Acids are substances which gives H+ ion in aqueous solution.  Acids taste sour ,not bitter.

Q: 2.) An analyte solution was prepared using 1.1278 g of a diprotic acid and 25.0 mL of distilled…

A: Here we are required to find the Molarity of undiluted analyte and molecular weight of diprotic acid…

Q: At standard conditions, is the electrochemical reaction spontaneous? Anode: NO3- + 2H+ + e- --> NO2…

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Q: How many mL of a 0.630M NaOH solution are needed to neutralize 20.0mL of a 0.255M HaSO4 solution?

A: Molarity of NaOH(M1) = 0.630 M Volume of H2SO4(V2) = 20.0 ml Molarity of H2SO4(M2) = 0.255 M

Q: NAME D. Steos SHOW THE EXPANDED CONDENSED FORMULA:

A: Write condensed formula of the given structure---

Q: 3. For a basic zwitterion, the isoelectronic point is (circle all that are correct): a. below pH 6…

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Q: Ammonia is a weak base (Kb = 1.8 x 10-5). What is the pH of 1.2 M ammonia? 2.33 4.74 9.26 10.14…

A: Given, Concentration of the ammonia (C) = 1.2 M Kb  for Ammonia (NH3) = 1.8 × 10-5 Note: Ammonia…

Q: much KClO3reactant

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Q: NH,+ Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone…

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Q: How many grams of Ab O3 will be created from reacting 36.0 g of Al with a sufficient amount of O2?…

A: Given::  Mass of Al = 36.0 g molar mass of Al = 27 g mol-1 Molar mass of Al2O3= 101.96 g mol-1  Mass…

Q: 3) Consider the Lewis structure of adenine (a component of DNA) shown below. Refer to this structure…

A: C electronic configuration 1s2 2S2 2p2 N- 1s22s22p2

Q: 217 What is the daughter nucleus (nuclide) produced when At undergoes alpha decay? Replace the…

A: Alpha decay means loss of helium nucleous.

Q: 1. Using the table of standard free energies, calculate the equilibrium constant, Kp, for the…

A: Recall the reaction, 2HCl(g) <==> H2(g)+ Cl2(g)  Kp @25℃ = ?

Q: Complete the following table, which lists information about the measured acid dissociation constants…

A: Acidic strength of acid is directly proportional to ka and inversely proportional to the pka value

Q: Calculate the solubility of BaCrO, in water at 25 °C. You'll find K., data in the ALEKS Data tab. sp…

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Q: Find the pH of a 0.22 M AlCl3 (aq) solution if Ka of Al3+ is 1.2 × 10–5

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Q: Given the following reactions: Anode: NO3- + 2H+ + e- --> NO2 + H2O Cathode: 2H+ + 2e- - --> H2…

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Q: A base that does not gain H + easily is called:   a. weak base   b. concentrated base   c. strong…

A: Define, Brønsted-Lowry theory,

Q: Which of the following SN reactions will take place? 1. NH2 + NH2 2. HO- + F OH + 3. CN + CN

A: We have to tell which types of substitution reaction takes place here. There are two types of…

Q: A 0.3005g sample containing Na2CO3 and NaOH requires 11.5 mL of 0.1055 M HCl to reach the…

A: Here 0.3005 g of sample of Na2CO3 and NaOH required 11.5 ml of 0.1055 M HCl using phenolphthalein…

Q: Question 2 H-C-OH 3. Н, Ра/ВasO, 1. NaCN H', H20 H-C-OH 2. H,O 4. H20 -NH2H Н—с—он Н.С — он Which…

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Q: When an electron moves from an outer shell to a lower shell, the electron's potential energy is…

A: Given statement is : When an electron moves from an outer shell to a lower shell, the electrons…

Q: A sample of gastric juice has a pH of 2.5. what is the hydrogen ion concentration in this secretion?…

A: Given-> pH = 2.5

Q: 6) What meaning of solubility and? 7) What is the principle of conductivity meter?

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Q: It takes 839. kJ/mol to break a carbon-carbon triple bond. Calculate the maximum wavelength of light…

A: Given-> Energy = 839 kJ/mole = 839 × 1000 J/mole  (1 KJ = 1000 J)

Q: how important is chemical bonding in the production of polyvinylchloride?

A: PVC is produced mainly from the polymerising the Chloroethene It is sometimes also called as…

Q: Consider the following acids:   benzoic acid formic acid hypobromous acid propanoic acid…

A: Given acids are :  HC7H5O2 HCO2H HBrO HC3H5O2 6.4×10-5 1.8×10-4 2.8×10-9…

Q: I need to write about the mechanism and how it happens in this lab please help me explain what…

A: In the above reaction hydroboration takes place where CHO group reduced to -CH2OH.

Q: Which of the following ions are always present in an acidic solution?   a. hydronium ions   b.…

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Q: "Cyclohexene is a linear molecule with 6 carbon atoms and 12 hydrogen Describe the molecule…

A: We have to tell why the response is wrong and also have to give the real response.

Q: 21. Which of the following involves a change of state in matter? * a. Adding food color to water b.…

A: 21.)  Change is state involves conversion of state from Solid - liquid - gas .  22.) Naphthalene…

Q: 13. Which of the following ranks the states of matter based on the compactness of the molecules? *…

A: Intermolecular space is the space between two molecules or atoms. In solid it is very little, in…

Q: The freezing-point of depression of a 0.010 b acetic acid solution is 0.00193 K. Calculate the…

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Q: What is the pH of a 0.020M ammonia (NH3) solution if its Kb value is 1.8x10-5? a.12.3 b.10.8 c.3.2…

A: Given : [NH3] = 0.020 M Kb = 1.8×10-5 pH = ?

Q: Draw the ICE table and calculate the value of K. for the equilibrium system: H2(8) 12(3) 2 HIg) at…

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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".