A student believes she is observing a chemical reaction when pure sugar is burned and caramelizes. How can the student tell that a chemical change has really occurred? a. by comparing the solubility of each in water b. by comparing their volumes c. by comparing their masses d. by comparing whether each are in the solid, liquid, or gas phase

Q: It says the solution is incorrect

A: Given that, for carbon-11 The half-life is t1/2 = 20.3 min. The initial amount is N0 = 1×107 atoms.…

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Q: VO2+ (aq) + CrO2 (s) --> Cr2O72- (aq) + V3+ (aq) Balance the redox equation in acidic solution…

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Q: Compute the standard change in Gibbs free energy for the reaction 2 NO2(g) → N2O4(g) at 43 C.

A: Given : reaction and thermodynamic data  Tip :     ∆G° = ∆H° - T∆S°

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

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Q: 4) 5) 6) CH3-CH-COOH NH₂ HO Н HO- Н H Н -ОН -Н -OH -ОН CH2OH [H] [H] LiAIH4 -CH2-CH-СООН NH₂ Ca(OH)…

A: LiAlH4 is an strong reducing agent . Thus it will reduce completely as it is a very good source of…

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A: Both atoms has SP3 Hybridization

Q: Which reagents in this experiment are corrosive? Group of answer choices 1.KMnO4 2.the iron sample…

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Q: 17.52 Use three-letter and one-letter abbreviations to write the amino acid sequence for the peptide…

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Q: Aspirin (C9H8O4) is made by the balanced reaction below. If you start with 2.5 x 103 grams of…

A: The balanced reaction is below as :-  C7H6O3 + C4H6O3 -----> C9H8O4 + HC2H3O2

Q: How much potassium oxalate can be added to 156.0 mL of 0.5 M [Cu(NH3)4]Cl2 before a precipitate of…

A: According to the question, Volume of the [Cu(NH3)4]Cl2 = 156.0 ml The molar concentration of…

Q: Example: A sample of lead (s = 0.130 J/g-°C) is heated to 90.°C and then dropped into 80. g of water…

A: Q = m . s . ΔT Where, Q = heat absorbed or evolved; m = mass of substance; s =specific heat of…

Q: Calculate the molar hydrogen ion concentration of each of the following biological solutions given…

A: pH of a solution is defined as the negative logarithm of hydrogen ion concentration  pH = -log[H+]

Q: Draw a portion of cellulose.

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

Q: 91. An 8.5-g ice cube is placed into 255 g of water. Calculate the temperature change in the water…

A: mass of ice cube = 8.5 gm Mass of water = 255 gm Formula used  q = mC∆T and q= mHf From standard…

Q: (d) Provide an appropriate IUPAC name for the following structure. 3. Br (e) Draw a bond-line…

A: (d) IUPAC- 3-bromo-5-isopropyl octane  3. 95.18%.    4.75%

Q: Use the thermodynamic data given below to compute the formation constant, Kf for [Zn(NH3)4]2+ in…

A: Answer:- Firstly a balanced equilibrium equation is written then using given standard enthalpy vqand…

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Q: If a 238U atom decays by a series of radioactive decays that includes emission of 4 alpha particles…

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Q: Find the product(s) of the following addition reactions. Name the products using IUPAC guidelines.…

A: Addition reaction: The chemical reaction in which two or more molecules combine to form an adduct…

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Q: A galvanic cell can be prepared from copper and tin. Which pair of substances will be the electron…

A: Given : reduction half cell reaction

Q: SO has several resonance structures. Consider one of these structures in which all the atoms follow…

A: Correct answer is  The molecular geometry or shape of SO3 is trigonal Planar. It is exceptional case…

Q: for D, how did we get 0.693?

A: D. The equation of half-life for a first order reaction is -                               t12 =…

Q: A solution of 0.152 M NaOH is used to titrate 18.0 mL of a solution of H₂SO4: H₂SO4 (aq) + 2NaOH(aq)…

A: Given: The molarity of NaOH = 0.152 M The volume of H2SO4 taken = 18.0 mL The volume of NaOH…

Q: pH = 12.67; [H:0*] =? pH = 7.75; [OH-] =? [OH-] = 0.003 M, pH=?

A: Since you have posted a question with multiple subparts, we can solve only first three subparts for…

Q: NBS, peroxide hv ?

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Q: the two ammonia species are ammonia (NH3) and the ammonium ion (NH4+. The total ammonia…

A: NH4+= NH3+ H+  pka =6.34  pH = 8 Concentration of…

Q: A 547 mLmL NaClNaCl solution is diluted to a volume of 1.45 LL and a concentration of 3.00 MM . What…

A: Given : Initial volume = V1 = 547 mL = 0.547 L Final volume = V2 = 1.45 L Final concentration = M2 =…

Q: Macmillan Learning Question 9 of 18 > What is the daughter nucleus produced when 50 Mn undergoes…

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Q: The total number of valence electrons in the molecule BrF is 5 called 42, Square pyramidal 42,…

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Q: 8. Give the missing items in the synthesis. Draw stereochemistry where appropriate. H₂ Lindlar cat.…

A: Potassium tert butoxide act as base Lindlar catalyst convert alkyne into cis alkene

Q: 25. Experiment Trial 1 2 [x] (Molarity) 0.1 0.2 [Y] (Molarity) 0.3 0.6 Rate (M/min) 4.0 x 10-4 1.6 x…

A: Rate law = k [X]a[Y]b Order of reaction (n) = a + b

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Q: Give the proper name for the compound [Co(NH3)4]Cl2

A: Given compound :  [Co(NH3)4]Cl2

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Q: what is the temperature when 20 grams of salt is added to boiling water

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Q: 1. Kenneth wants to prepare a 2.40 mol/L solution of sodium nitrate KNO3. The desired volume Kenneth…

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Q: The specific heat of mercury is 0.140 J/g°C. Calculate the heat necessary to raise the temperature…

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Q: A solution is prepared by dissolving 43.7 g of potassium chloride (KCl) in a small amount of water…

A: Mass of KCl = 43.7 g  Volume of solution = 250 mL = 0.25 L