19. How best describes isotopes?     20. Who discovered lectrons?

Q: How many grams of NaCl, molecular mass = 58.5 g/mol, are necessary to make 1 liter of 5% saline?

A: Answer: In this question (w/v)% of Saline water solution along with its volume is given to us and we…

Q: 6. Nitrogen dioxide dimerizes according to the following reaction: 2NO₂(g) = N2O4(g) Kp = 6.9 at 298…

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Q: The preparations of two aqueous solutions are described in the table below. For each solution, write…

A: Given - 1.Moles of NaOH = 0.9 mol   Volume of HCH3CO2 =1.0 L   Molarity of HCH3CO2 = 0.9M 2. Moles…

Q: Dalton's Law of Partial Pressures Suppose 0.40 mol  He(g) and 0.80 mol Kr(g) are in a sealed 10.0 L…

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Q: How many grams of Cl2 can be prepared from the reaction of 15.6 g of MnO2 and 30.8 g of HCl?

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Q: How is TLC used to determine the purity of a sample?

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Q: OH Compound 1 CI ||||| Compound 3 CI Br Compound 2 Compound 4

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Q: Question 4 of 20 > Reven O Macmillan Learning SECOND EDITION Identify the inner electrons, outer…

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Q: What is the IUPAC name for the following compound? No capitalization, spaces, italization. НО

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Q: We've spent quite a bit of time thinking about the interactions between atoms or molecules, one of…

A: Given the bond energy of 1 mol C-C bond = 348 kJ/mol  We have to find the minimum frequency of…

Q: Suppose a 0.042 M aqueous solution of sulfuric acid (H2SO4) is prepared. Calculate the equilibirum…

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Q: Chemistry Can someone explain to me where the base peak for an ester on mass spectrometry is? I…

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Q: 24.5mL aliquot of 0.0934M H2SO4 (aq) is to be titrated with 0.0295M NaOH (aq).  What volume (mL) of…

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Q: Which is better fractionating distillation or simple distillation?

A: We have asked question about distillation. We have asked that which distillation is better steam…

Q: Richards and Willard determined the molar mass of lithium and collected the following data.…

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Q: A(n) OH OH OH T | | CH₂-C-CH₂ T H Glycerol ATP and a kinase. OH OPO || CH₂-C-CH₂ 1 H OH Glycerol…

A: The explanation is given below-

Q: Check all the boxes that are true. (Select all that apply.) O Valence electrons are the electrons in…

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Q: In a laboratory experiment, students synthesized a new compound and found that when 14.95 grams of…

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Q: Use the References to access important values if needed for this question. What is the concentration…

A: Henry law: This law states that the concentration of a gas dissolved in a liquid depends on the…

Q: There are 1.2 x 1024 atoms of carbon in a sample of aluminum acetate, Al(C₂H3O2)3. How many moles of…

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Q: H₂N- A(n) HO HO H₂N-C-C-0 CH3 Alanine -C-C-O + H₂N- H Glycine reaction converts glycylalanine to…

A: 1)  Glycylalanine is a protein formed by the combination of glycine and alanine. Thus, glycylalnine…

Q: Consider a solution of 0.877 molal (m) ethanol in water. Considering the normal boiling point for…

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Q: 15.33 Classify each of the following species as a weak or strong acid: (a) HNO3, (b) HF, (c) H₂SO4,…

A: 15.33) Any acid which dissociates completely into ions is called a strong acid. Any acid which…

Q: A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this…

A: The percent composition of the compound is: C = 40.0 % H = 6.70 % O = 53.3 % by mass Total mass of…

Q: Why does in a distillation, it is needed to heat up the mixture above the boiling point of one…

A: In simple distillation process, we separate a mixture of two different liquids whose boiling point…

Q: In the lowest energy conformation of cyclohexane, is the methyl group at C2 in the axial or…

A: in the most stable conformation maximum number of methyl groups are equatorial

Q: Material X has an atomic radius R = 0.125 nm, an atomic weight of A = 51 g/mol, and a body centered…

A: Answer: Density of BCC crystal structure can be calculated using following formula: d=Z×MNA×a3 Here:…

Q: QUESTION 1 (a) (b) (d) (e) Define sensor Explain four characteristics of sensor List four…

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Q: Macmillan Learning At a certain temperature, 0.300 mol CH, and 0.961 mol H₂S are placed in a 4.00 L.…

A: Given reaction: CH4(g) + 2H2S(g) ⇌ CS2(g) + 4H2(g) The initial moles of CH4 and H2S are 0.300 mol…

Q: Draw the most stable and least stable Newman Projections of 2,3-dimethylbutane by viewing along the…

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Q: For each of the following ions, indicate the noble gas that has the same Lewis structure as the ion.…

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Q: How many valence electrons do atoms of each of the elements have? Li: Br: B: N: valence electrons…

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Q: 15.91 Classify each of the following species as a Lewis acid or a Lewis base: (a) CO₂, (b) H₂O, (c)…

A: Based on the formula of chemical species we can classify as Lewis acid or Lewis base.

Q: molecular formula of a compound of 66.6 % Carbon, 11.2 % Hydrogen, and 22.2% Oxygen with a molar…

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Q: What is an example of the success of eusocial insects? O Only 2% of insects are eusocial but they…

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Q: Use the periodic table to classify each element as a main-group metal, a transition metal, an…

A: Main group element  Elements of S and P block together called main group elements.

Q: suppose a 0.017M aqueous solution of oxalic aicd (H2C2O4) is prepared. Calculate the equilibirum…

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Q: 15.83 Classify the following oxides as acidic, basic, ampho- teric, or neutral: (a) CO₂, (b) K₂O,…

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Q: Choose the best option for the precursor to 3-chlorobenzaldehyde. от 'H OH В CI 'Н 'OH j= H 'OH

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Q: (a) Dihydrogen cation H2+ is commonly found in interstellar space. It can be generated by ionization…

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Q: @ the number of moles of O2 in 29.02 of O₂ gas. (6) The voterme, in litres occupied by 2.30 moles of…

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Q: 15.83 Classify the following oxides as acidic, basic, ampho- teric, or neutral: (a) CO₂, (b) K₂O,…

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Q: Match the following aqueous solutions with the appropriate letter from the column on the right.…

A: When non-volatile solute is dissolved in solvent then freezing point of solution decreases it is…

Q: 4. A student obtains the following data. mass of clean, dry and empty crucible mass of crucible with…

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Q: 15.3 Classify each of the following species as a Brønsted acid or base, or both: (a) H₂O, (b) OH",…

A: Bronsted Acid: Bronsted Acid are those species which can donate proton (H+). Bronsted Base :…

Q: What amount (moles) is represented by each of these samples? 140.8 g  Fe2O3    =…

A: 1. mole of molecule  =Avogardous number of molecules  2. 1 mol of molecule  containes molecule equal…

Q: Using first- and second-order integrated rate laws Consider this reaction: H_CO,(@g) — H_O{q}…

A: From the given rate expression, we can determine the order of the reaction. And from that expression…

Q: chloral hydrate (C2H2Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound…

A: We are to calculate the molar mass of chloral hydrate, C2H3Cl3O2 . Chloral hydrate is a drug used as…

Q: Multiply or divide the following measurements. Be sure each answer you renter contains the correct…

A: Rule of significant digit- 1) In non decimal number, 0 comes after non-zero not count in significant…

Q: μmol L A chemist must prepare 125. mL of 31.0 µM aqueous mercury(II) iodide (HgI₂) working solution.…

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.