A student used two balances to measure the mass of a standard weight with a mass of exactly 100.00 g and recorded the following measurements: Scale A 100.05 g Scale B 101.23 g Select the correct statement from the following: The Scale A measurement is more precise. The Scale A measurement is more accurate. The Scale A measurement is less precise but more accurate. The Scale A measurement is more precise but less accurate.

Q: (Q20) In the hydrosulfuric acid solution described in Q19, what is the equilibrium concentration of…

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Q: What pH range is a HCN – NaCN buffer effective?

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Q: net ionic equation.

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Q: 4. What is the pH of a 2.15 x 10-3 M oxalic acid (H2C2O4). The Ka of oxalic acid is 6.4 x 10-5.

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Q: The selectivity coefficient, Kg-r. for a K* ion-selective electrode is 0.00649. When the electrode…

A: With β=1, the response of an ion-selective electrode is given as: E=constant+0.05916ZA log ([Primary…

Q: One milliliter of sodium hydroxide reacts with 40.84mg KHP (KHC8H4O4). What is the molar…

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Q: For the reaction 2SO2(g) + O2(g)2SO3(g) H° = -197.8 kJ and S° = -187.9 J/K The equilibrium…

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Q: Does a reaction occur when aqueous solutions of sodium hydroxide and potassium nitrate are combined?…

A: reaction occurs between sodium hydroxide and potassium nitrate . Yes

Q: A student recorded the following end-point volumes in an acid-base titration: Trial Number Volume…

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Q: Does a reaction occur when aqueous solutions of manganese(II) nitrate and iron(III) chloride are…

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Q: Write the chemical name for N2H4. Type of Bonding: Show Lewis Structure or Bonding in the solution…

A: The details about N2H4 is given below

Q: Calculate the Rf value of a spot if it travelled 1.5 cm while the solvent travelled 2.5 cm. Express…

A: Given :  1. Spot distance = 1.5 cm  2. Solvent distance = 2.5 cm

Q: the pH of a buffer solutiont

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Q: The equilibrium constant, Ko, for the following reaction is 2.44×10-2 at 596 K. NHẠCI(s) ? NH3(g) +…

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Q: As a glass is cooled-down it experiences the following structural changes. Select one: The free…

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Q: [CLO-2] Which of the following changes can influence all structres (primary, secondary etc) O pH…

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Q: Directions: Calculate the standard entropy change for the following reaction using the table of…

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Q: Can the law of conservation of mass be applied when cooking? In one to two sentences, explain why or…

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Q: True or false? The NMR signal of an alcohol or amine proton often presents as a broad signal due in…

A: The NMR signal of an alcohol or amine proton often present as a broad signal because hydrogen…

Q: According to the following unbalanced reaction, if the rate of appearance of oxygen gas is 4.00 x…

A: Given: Rate of appearance of oxygen gas = 4.00 x 10-2 M/s

Q: What features are expected with rising distance for a radial distribution plot [g(r)] of a system in…

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Q: - Mention some common types of oxygen compounds?

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Q: In a solution of Ba(OH)2, if the concentration of the hydroxide ion is 0.45 M, what is the…

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Q: Write the chemical reaction for the incongruent dissolution of spodumene.

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Q: When 2.0 g NaOH were dissolved in 53.0 g water in a calorimeter at 24.0 °C, the temperature of the…

A: 2.0 g of NaOH were dissolved in 53.0 g of water at 24.0◦ C . The temperature of the solution went up…

Q: 1. Chorine is widely used to purify municipal supplies water and to treat swimming pool waters.…

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Q: 2. Propose a synthesis for the following molecules – should not take more than 5-6 steps. Hint: they…

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Q: A buffer solution contains 0.320 M C6H5NH3Br and 0.383 M C6H5NH2 (aniline). Determine the pH change…

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Q: The Fe2+ (55.845 g/mol) content of a 2.475 g steel sample dissolved in 50.00 mL of an acidic…

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Q: 0.4044 g solid organic sample containing covalently bound bromide and no other halogens was placed…

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Q: new coin having a mass of 2.5133 g is dissolved in nitric acid and only the resulting copper ions…

A: Nitric acid is a strong oxidizing agent. It can oxidize metals to their respective cations.

Q: For BaF2 (Ksp = 1.7 × 10–6), will a precipitate of BaF2 form when 0.10 L of 6.0 × 10–2 M Ba(NO3)2 is…

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Q: a) b) NH2 с) Но d) 1. NaH OTf 2. CH212, Cu-Zn, diethyl ether

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Q: 1. What is the pH of a buffer that contains 1.100 M NH3 and 1.300 M NH4+? Ka= 5.70x10-10 What would…

A: As per our guidelines, we are supposed to answer only one question. Kindly repost other question as…

Q: Balance the reactions below using the change in oxidation number method. 1. PBO2 + HBr → PbBr, + 0,…

A: Gaining of electrons is called as Reduction Losing of electrons is called as Oxidation.

Q: Calculate the molar solubility of SrC204 in a solution that has a fixed H3Ot concentration of (Kp…

A: Given Ksp of SrC2O4(s) = 5.0*10-8  For H2C2O4, Ka1 = 5.60*10-2 , and Ka2 = 5.42*10-5 .

Q: Vhere possible, classify these systems as reactant-favored or product-favored at 298 K. If the…

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Q: 3. Discuss the concept of chemical equilibrium, including its requirements. Please select all…

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Q: 9. Which one of the following sets of reactants is most likely to have the slowest rate of reaction?…

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Q: Suppose you burn a 2.4 g sample of potato chips. You use the heat given off from that process to…

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Q: A sample of gas with volume 21.4 mL at STP is expanded to a pressure of 0.98 mmHg at a temperature…

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Q: why dimethylaminobenzaladehyde is more nonpolar than 4-methoxybenzaldehyde?

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Q: Total acidity of commercial white wine was determined by titration with 0.1512 M NaOH. A. Write the…

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Q: Does a reaction occur when aqueous solutions of cobalt(II) nitrate and copper(II) sulfate are…

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Q: Polarity and IMFA A. Given the Lewis structure and molecular geometry, predict if each substance is…

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Q: What is the molarity of 0.654L of solution with 0.444mol CoCl2 in it?

A: Given, moles of CoCl2 = 0.444 mol Volume of the solution = 0.654 L Molarity of CoCl2 solution = ?

Q: quantum numbers and orbital notation. Explain why these are impossible. a. n=4, =2, m²-3, m,=-½ b.…

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.