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How can we analyze the molecular structure and behavior of liquid crystals to enhance the performance and efficiency of display technology?

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

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What is the heat released during the combustion of 5 grams of propane (C3H8) at constant volume, given that the enthalpy change of combustion of propane is -2220 kJ/mol?

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

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What is the corrosion current density of iron in a 0.1 M hydrochloric acid solution at 25 °C, if the corrosion potential of the metal is -0.44 V vs. the standard hydrogen electrode and the Tafel slope is 120 mV/decade of current density?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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How can we reduce greenhouse gas emissions from transportation sources, such as cars and airplanes, through the use of alternative fuels and technologies in order to mitigate the impact of global warming?

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

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What is the percent yield of silver chloride when 24.5 g of silver nitrate solution reacts with excess sodium chloride to form 23.1 g of silver chloride? The balanced chemical equation is: AgNO3 + NaCl → AgCl + NaNO3.

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

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What is the heat of neutralization for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) when 50 mL of 2 M HCl is mixed with 50 mL of 2 M NaOH in a calorimeter and the temperature increases from 25°C to 31°C?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the corrosion current density of a copper metal in a galvanic couple with a silver metal in a 0.1 M solution of NaCl at 25°C, given that the open circuit potential is 0.34 V and the Tafel slope is 120 mV/decade for the copper electrode?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What are the factors that affect the degree of color change in a photochromic material, and how can these factors be controlled and optimized for practical applications such as eyeglasses or windows?

asked Mar 1 in PhotoChemistry by TheScientist (138k points)

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What is the formal charge of the oxygen atom in the sulfate ion (SO4^(2-))? Show your calculation and explain the meaning of the formal charge in this context.

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

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How can we increase the exposure to chemistry in everyday life for individuals who are not enrolled in chemistry courses?

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

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What is the enthalpy change for the hydrolysis of one mole of sucrose (C12H22O11) to glucose (C6H12O6) and fructose (C6H12O6), given the standard enthalpies of formation for sucrose, glucose, and fructose?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the amount of heat absorbed by a 50 g sample of water when it is heated from 20°C to 100°C? (Specific heat of water= 4.18 J/g·K)

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

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What is the effect of adding a buffer to a solution containing acetic acid and sodium acetate on the equilibrium position of the acid-base reaction between acetic acid and acetate ions? Provide numerical calculations to support your answer.

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

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What is the formal charge of the nitrogen atom in the molecule HCN?

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

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What is the monolayer capacity of a sample of activated alumina with a surface area of 200 m2/g, using the BET theory of multilayer adsorption and assuming a specific surface area of 16.2 × 10-20 m2 for nitrogen at 77 K?

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

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What is the energy of the vibrational mode that gives rise to an absorption band at 1712 cm$^{-1}$ in the IR spectrum of a molecule of acetic anhydride (C$_4$H$_6$O$_3$)?

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

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What is the heat of hydration for the reaction between 50 grams of anhydrous copper(II) sulfate and excess water, given that the final solution mass is 250 grams and the temperature change observed during the reaction is -30 °C?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the change in entropy for the reaction 2H2(g) + O2(g) → 2H2O(g) at a temperature of 298 K?Given the standard entropy values of H2(g), O2(g), and H2O(g) are 130.6 J/K/mol, 205.0 J/K/mol, and 188.7 J/K/mol respectively.

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

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What is the theoretical yield of aspirin that can be obtained from the synthesis of 5 grams of salicylic acid and excess acetic anhydride?

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

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What experimental techniques can be utilized to identify the type of inorganic solid present in a given sample (ionic, covalent, or metallic)? Provide a detailed explanation of each technique and its corresponding results.

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

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