Philosophers and scientists came up with the early ideas of particles. Democritus believed that matter is made up of tiny particles which are indivisible He called this particle, atomos. Two centuries ago, John Dalton presented an evidence that all matter is made up of very small particles called atoms which are indivisible and indestructible What is common in the idea of Democritus and Dalton about the particles of matter? Do you think this idea is final? Why or why not?

Q: 3. Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/m...

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Q: Which type of particles do we generally prefer for purposes of precipitation gravimetry?   Crystall...

A: particles which generally prefer for  precipitation gravimetric analysis is given below

Q: Answer 5 onl

A: The unit cell for tin has tetragonal symmetry, with a and b lattice parameters of 0.583 and 0.318 nm...

Q: A 43.9 mL solution of 0.827 mol L-1 HCl is titrated using 0.165 mol L-1 NaOH. What volume of NaOH (...

A: Given: Molarity of NaOH=0.165 M The volume of NaOH=V mL Millimoles of NaOH=Molarity x volume (mL)=0....

Q: Estimate the charge of the following oligopeptides at pH 7 based on the pKa values of the constituen...

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Q: A reaction occurs according to the following balanced chemical equation: AgB (aq) + 6 CD (aq) → CB (...

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Q: Which one of the following statements regarding Henry's law is not correct? * The partial pressure o...

A: Different gases have different Henry constant values at the same temperature. This means that it is ...

Q: Indicate the oxidation state of the underlined element in the following species. Show all pertinent ...

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Q: Which of the following expressions is the correct equilibrium-constant expression for the following ...

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Q: Give the structures of two different alkyl bromides both of which yield the indicated alkene as the ...

A: Given : structure of products. 

Q: Select the correct reagents to carry out the following multi-step synthesis. CH3 CH2-Br CH,-OH CHO s...

A: 1. Fridel craft alkylation is electrophilic aromatic substitution reaction in which benzene acts as ...

Q: he burning of 50.2 g of SiH 4 (MW= 32.8)at constant pressure gives off 3790 kJ of heat. Calculate A ...

A: Please see the attachment. 

Q: Describe the relationship between each of the pairs of isomers shown by recording Constitutional, Co...

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Q: References) What number of molecules (or formula units) are present in 5.12 g of each of the followi...

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Q: One solution contains 44% alcohol, and another solution contains 81% alcohol. How many liters of 81%...

A: Given  One solution contains 44% alcohol, and another solution contains 81% alcohol. We need to find...

Q: H2N- CH-C- NH- CH2-C-NH-CH2- NH-CH-C-NH-CH-C-OH CH2 CH2 CH2 CH Compound A (Leu-enkephalin) H3C CH3 O...

A: Since you have asked multiple questions we will answer the first one for you. To get the remaining q...

Q: Theoretical yield of chemical reactions Aqueous hydrobromic acid (HBr) reacts with solid sodium hydr...

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Q: Which of the following reactions is a non-markonikov's? a. CH3CH=CH2 to CH3CH2CH3 b. CH3CH=CH2 to ...

A: A. CH3CH=CH2  +H2 ------> CH3CH2CH3 This is  hydrogenation reaction this is non markonikovs addit...

Q: The gas phase reaction A+B - C has a rate law which is 2nd doubled, the reaction rate would be incre...

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Q: 10.0 M NH3 pH: [H30+]: [OH-]: pOH:

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Q: I have problems understanding the results of this experiment, could you help me by explaining the re...

A: Lambda Max is a wavelength at which absorbance of solution is maximum comparing with absorbance at o...

Q: If you added 5.0 mL of 2.0 M NAOH to 45.0 mL of pure water what would the resulting ApH of the solut...

A:     5.0 mL of 2.0 M of NaOH is added to 45.0 mL of pure water. We have to calculate the resulting ∆p...

Q: Given the following data for the NH4* + NO2 → N2 + 2H20 reaction Trial [NH4*] 0.015 M Rate [NO2] 0.0...

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Q: Reaction with Ammonium Molybdate and dilute Nitric Acid

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Q: You will need to prepare 700mL of Phosphate buffer pH 5.8 by combining the 0.2M Phosphate Monobasic ...

A: Given: pH = 5.8 Volume of solution = 5.8 concentration of NaH2PO4 = 0.2 M Ka2 of H3PO4 = 6.2*10-8  

Q: A compound decomposes by a first-order process. If 13% of the compound decomposes in 60 minutes, the...

A: Given values- Time = 60 minutes Decomposition = 13%

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 0.38 kg sample ...

A: Answer: Heat capacity can be calculated by below shown formula: Q=nC∆TQn∆T=CC=Qn∆There:Q=heat addedn...

Q: Consider the structure of pent-2-ene, if it undergoes ozonolysis, which of the following final produ...

A: Given,  Pent-2-ene undergoes ozonalysis formed final products are:

Q: Which of the following is true? a. A slow reaction has small Ae to reach the Ts and start forming p...

A: a. A slow reaction has small Ae to reach the Ts and start forming products.

Q: What is the percent yield of CO 2 if the reaction of 10.0 grams of CO with excess O 2 produces 14.0 ...

A: Using stoichiometric ratio we can determine how many moles of CO2 produce and from that we can calcu...

Q: An buffer is prepared by combining 1.61 moles of HX solution with 0.28 moles NaX and diluting to a t...

A: Given :- number of moles of HX = 1.61 mol  Number of moles of NaX = 0.28 mol  Total volume = 1 L  Ka...

Q: Calculate the pH of a solution with a hydrogen ion concentration of 4.5×10 M. a. Is this solution an...

A: pH = -log[H+]  [H+] = 10-pH  

Q: Please help by identifying each functional group. There is at least 2 steps for each

A: We have to carry out the given transformation atleast in 2 steps.

Q: A 0.5239 g sample of unknown solid was analyzed for sulfate. 0.3466 g of BaSO4 was obtained after gr...

A: Gravimetric analysis is a technique to find the mass of analyte in the sample by converting it into ...

Q: Give the IUPAC name of the following structure: HO.

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Q: Determine the pH of a 0.581 M aqueous solution of KF. For hydrofluoric acid, Ka = 7.0 × 10−4.

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Q: 36) Apure substance be oparated into two difs.

A: Given : a pure substance. 

Q: Which of the following reaction may have a different reaction mechanism compared to the others?  a....

A: Addition reaction - combination of two or more reactant to form a product  Elimination Reaction - re...

Q: 3. Describe the crystal structure of iron, which crystallizes with two equivalent metal atoms in a c...

A: Copper crystallizes in a face centered cubic structure. What is the mass of one unit.

Q: masses

A: This 'missing' mass (about 0.1 percent of the original mass) has been converted into energy accordin...

Q: Describe the relationship between each of the pairs of isomers shown by recording Constitutional, Co...

A: If the configuration of all the chiral centres get reversed then they are enantiomers and if all rem...

Q: (A) 1,2- and 1,4-additions of conjugated systems

A: Given : structure of reagent

Q: The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.085...

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Q: Which of the molecules below is the expected major product of the following reduction? Na. NH)

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Q: Indicate the oxidation state of the underlined element in the following species. Show all pertinent ...

A: The oxidation state of an element can be explained as the charge acquired by that element in the giv...

Q: 2. Which of the following structural formulas represent identical compounds and which represent cons...

A: for the given structures, we need to identify the structures that are identical and the structures t...

Q: Check Your Understanding on Crystal Structure 1. Differentiate crystal structure, crystal system, an...

A: Miller indices are used to specify direction and plane. Miller indices are group of three numbers wh...

Q: It is the study of the heat or energy involved in physical and chemical changes. Thermodynamics The...

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Q: Consider a buffer solution comprised of HF and F-. The Ka of HF is 6.3 x 10-4. If the pH of the buff...

A: Weak acid are those acid which does not dissociate completely in aqueous solution. Here HF is weak a...

Q: Liquid octane (CH3(CH,) CH, reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide (C...

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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.