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What is the pH of a solution with a concentration of 0.005 M hydrochloric acid (HCl)?

asked Mar 1 in Chemical reactions by TheScientist (138k points)

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What is the yield of 2,4-dichlorobenzoic acid formed when 10 grams of benzoic acid and excess chlorine gas are used in the synthesis, if the actual yield obtained is only 6.5 grams?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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How does the zeta potential affect the stability of colloidal systems, and how can it be measured experimentally?

asked Feb 28 in Surface Chemistry by TheScientist (138k points)

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What is the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C, measured using a pH meter with a sensitivity of 0.01 pH units?

asked Mar 1 in Analytical Chemistry by TheScientist (138k points)

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How can we design a drug that selectively targets the COX-2 enzyme for treating inflammation, while avoiding harmful inhibition of the COX-1 enzyme in the body?

asked Mar 1 in Medicinal Chemistry by TheScientist (138k points)

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Using Monte Carlo simulations, analyze the phase transition of water from a liquid to a gas at different pressures and temperatures and determine the critical point at which the two phases become indistinguishable.

asked Mar 1 in Computational Chemistry by TheScientist (138k points)

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What is the standard enthalpy change of combustion for methane gas (CH4) at 298 K? Given that the standard enthalpy of formation of CO2(g) and H2O(l) are -393.5 kJ/mol and -285.8 kJ/mol, respectively.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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How can you design a system for the efficient and sustainable production of natural flavors using bio-based and renewable resources while ensuring the highest quality and purity standards?

asked Mar 1 in Chemical engineering by TheScientist (138k points)

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What is the bond strength of the nitrogen-hydrogen bond in ammonia (NH3) as compared to the nitrogen-hydrogen bond in hydrazine (N2H4)? Use electronegativity values and bond lengths to justify your answer.

asked Mar 1 in Chemical bonding by TheScientist (138k points)

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What is the standard enthalpy change for the reaction 2NO(g) + O2(g) ⟶ 2NO2(g) , given that the standard enthalpy of formation of NO(g), O2(g) and NO2(g) are 90.4 kJ/mol , 0 kJ/mol, and 33.2 kJ/mol, respectively?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the yield of 2,4-dinitrophenylhydrazine obtained from the reaction of hydrazine and 2,4-dinitrochlorobenzene if 5 grams of hydrazine and 7 grams of 2,4-dinitrochlorobenzene are used and the resulting product weighs 4.5 grams?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the standard molar entropy change (∆S°) for the reaction: 2HBr(g) + Cl2(g) -> 2HCl(g) + Br2(g) if the standard molar enthalpy change (∆H°) is -107.6 kJ/mol?

asked Mar 1 in Inorganic Chemistry by TheScientist (138k points)

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What is the pH of a 0.1 M solution of hydrochloric acid (HCl)?

asked Mar 1 in Inorganic Chemistry by TheScientist (138k points)

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What is the standard free energy change for the following redox reaction at 298K?Cr2O7(2-) + 14H(+) + 6e(-) → 2Cr(3+) + 7H2O(l)Given: E°(Cr2O7(2-)/Cr(3+)) = 1.33 V and E°(H2O/O2) = -0.82 V.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the standard enthalpy change of combustion (ΔH°c) for propane (C3H8) gas at 298 K, given the balanced chemical equation: C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(g)?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the formal charge of the sulfur atom in the compound SO₂?

asked Mar 1 in Chemical bonding by TheScientist (138k points)

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What is the specific surface area (in m²/g) of a sample of activated carbon that adsorbs 20 ml of nitrogen gas at STP, assuming monolayer formation and a nitrogen cross-sectional area of 0.162 nm²? The mass of the activated carbon sample is 0.5 g.

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the standard enthalpy change for the vaporization of 50 g of water at its boiling point of 100°C? The molar heat of vaporization for water is 40.7 kJ/mol.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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How can we design a system for the production of lubricants that meets the required specifications while minimizing environmental impact?

asked Mar 1 in Chemical engineering by TheScientist (138k points)

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What is the rate of the reaction if 2 moles of substance A react with 1 mole of substance B in 10 seconds, assuming it follows first-order kinetics with a rate constant of 0.5 s^-1?

asked Mar 1 in Chemical reactions by TheScientist (138k points)

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