A scientist is taking measurements on an unknown isotope to determine its half life. If the scientist starts off with a 100.0 g sample and after 1.00 year only has 23.6g left, what is the half life of the sample?

Q: Write the equilibrium reaction involved in the HCN-NaCN buffer system.

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Q: Enumerate the classes of organic derivatives of water that are soluble in concentrated H2SO4…

A: Solutions-  The classes of organic derivatives of water is all alcohols.

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Q: 2. Ate Shawol and Concertina performed electrolysis to determine the identity of an unknown metal X.…

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Q: what is the heat formation of electron?

A: Heat formation of electron  is also called as "electron gain enthalpy" .

Q: Draw the structure of simple amino acids and identify the functional groups of this molecule.

A: Detail description is given below

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A: Here we are required to find the mass of benzaldehyde needed for the reaction.

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Q: Find the pH of solution when 75.0 mL of 0.20-M acetic acid, HC₂H3O2, is titrated with 20.0 mL of…

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Q: A learner was assigning oxidation numbers for different elements in the compounds OF 2 and NaF. The…

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Q: Name 10 dissolved substances in water that negatively affect the environment.

A: 10 dissolved substances that create harmful affects in environment are

Q: 1. A 0.0250 M Ca(X)2 has a pH of 8.049. Ca(X)2 is composed of a Ca²+ cation and an unknown anion X,…

A: Given,  Molarity of Ca(X)2 = 0.0250 M.  pH of the salt solution = 8.049. The Kb of X- is :

Q: Graph the heating curve of ethanol using the information given. Check off each box as you add…

A: Heating curve depicts the effect of heating on a substance. It includes phase changes and heating up…

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Q: Use percent composition and molar mass to determine molecular formula. Analysis of a compound of…

A: Number of moles is calculated by dividing given mass with molecular mass.

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Q: A healthy human blood sample is measured in the lab to have [H3O+] = 2.50 x 10-8 M. What is the pH…

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Q: Consider this modified equation of state: nRT P: V-nb as a. Evaluate the term (85) for the equation.…

A: We have a modified equation of state which is given by P=nRTV-nb If we expand this equation, we will…

Q: I. Assign oxidation state to the underlined element. 1) Cl₂ 2) SO₂ 3) K₂02

A: Oxidation number: • Oxidation number of atoms in pure element or Atoms in free or uncombined…

Q: 6. Commercially available concentrated hydrochloric acid is 37.0% w/w HCI. Its density is 1.18 g/mL.…

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Q: Thermoplastics is an exampe of O Metal matrix composites O Polymer matrix composites O Carbon and…

A: Thermoplastics is an example of  = Polymer matrix composites

Q: 12. 13. • . 17 protons |||| ● I || H ● Li .Be. B. Na Mg. AI Si : Ar .. K .Ca. • Ga Ge . As Se : Kr…

A: For question 12, we have to find the elements that will form a bond. For question 13, we have to…

Q: Use percent composition to determine an empirical formula. A compound is found to contain S, O, and…

A: Empirical formula: Empirical formula: it can be defined as the simplest whole number ratio of…

Q: 4. Calculate the equilibrium concentrations of hydrogen & and iodine that result when 0.050mol HI is…

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Q: is This is an oxidation/reduction equation: ___CH3COOH(aq)     +     ___ H2O(l)            ___…

A: Given,  Consider the reaction,  CH3COOH(aq)  +    H2O(l)     < == >  CH3COO− (aq) +  H3O+ (aq)…

Q: Overall question: What is the molality of a 3.25 M aqueous solution of ethanol, C2H5OH? From…

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Q: Initially, 0.075 mol CH3OH(g) and 0.025 mol NOCI(g) was mixed at 25°C. At equilibrium, it was found…

A: Here we have to determine Kp and ∆G° of the following given reaction.

Q: 2. Give the IUPAC name for the following compound. H H3C, CH3 H H A) 2-methyl-4-isopropylheptane B)…

A: IUPAC NAME Is the method for naming organic compound and it's full form is International Union of…

Q: 1. 3. 4. 5. 1. 3. 4. 5. 1. 2. 3. 4. 5. 1. 2. 3. 4. 5. CARBOHYDRATES LIPIDS PROTEIN NUCLEIC ACID

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Q: When octane, C8H18, is burned in the presence of excess O2, the usual products of carbon dioxide,…

A: The no of moles of the substance is the ratio of the given mass of that substance to that of molar…

Q: Graph the heating curve of ethanol using the information given. Check off each box as you add…

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Q: Assume a 1.2 kg sample of a compound contains 0.9 kg of carbon. to one decimal place there are how…

A: Given 1.2 Kg of a compound contains 0.9 Kg of carbon, C.

Q: How many unique 13C NMR and 1H NMR signals exist in the spectrum for the compound:…

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Q: Additional Activities (PORTFOLIO OUTPUT #56) Directions: Cite 5 examples for each state of matter.…

A: Question asks five examples of three states of matter.

Q: 7 Compound 5 can be made from compound 1 in the following reaction sequence. Br OH step 2 step 1 +…

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Q: What is the cell potential for this electrochemical cell? V What is the sign for AGº for this…

A: Two Reduction potential says , lower potential electrode will act as anode and higher potential…

Q: E. Balance the following chemical equations. 1. 4. Ba3N₂ + HF → BaF2 + NH3 2. FeS + O₂ → Fe₂O3+ SO₂…

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Q: Can this be solved again? I do not think the answer is correct

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Q: Toluene (C6H5CH3) is a liquid compound similar to benzene (C6H6). Calculate the mole fraction of…

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Q: 14. Give the products of the combustion reaction of cyclohexane and balance the equation. + 0₂

A: Combustion reaction of hydrocarbons is the reaction of hydrocarbons in sufficient amount of oxygen…

Q: Which of the following is a conjugate acid/base pair? A) H₂O, NH₃ B) NH₄⁺, H₃O⁺ C) H₃O⁺, NH₃ D)…

A: Given,  Consider,  A) H₂O, NH₃ B) NH₄⁺, H₃O⁺ C) H₃O⁺, NH₃ D) H₃O⁺, H₂O The conjugate…

Q: The detection limits reported for Aluminum with ICP-AES and GFAAS are 2 ppb and 5 pg, respectively.…

A: Because of its longer seeing path, axial view has larger detection limits. It's also less linear and…

Q: 2. Write the product and the mechanism for reaction. Write the names of starting material and…

A: Here we are required to find the product of the reaction