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A sample problem for a chemistry student to solve from the subtopic Calculating the effect of changing the temperature on the equilibrium constant could be: What would be the new equilibrium constant (Kc) for the reaction 2NOCl (g) ↔ 2NO (g) + Cl2 (g) at 400 K, if the initial equilibrium constant at 300 K is 2.50 x 10^-3? Given that the enthalpy change of the reaction (∆H) is -91.84 kJ/mol and the entropy change of the reaction (∆S) is -188.8 J/mol K.

asked Jan 22 in Chemical equilibrium by WalterC19362 (2.4k points)

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A student is designing an electrochemical cell using zinc and copper electrodes. The student wants to know the current density (in A/cm²) when the cell operates at a voltage of 1.5 V and a temperature of 25°C. The area of the zinc electrode is 10 cm², and the area of the copper electrode is 5 cm². Assuming a 2:1 ratio for the transfer of electrons between the two electrodes, calculate the current density in the cell.

asked Jan 22 in ElectroChemistry by ZKLBarbra368 (2.3k points)

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A sample of nitrogen dioxide is placed in a container at 250°C and 1 atm, where it decomposes according to the following equation: 2NO2(g) ↔ 2NO(g) + O2(g)The initial concentration of NO2 is 0.10 M, and the equilibrium constant (Kc) at this temperature is 4.0 x 10^-3. If the volume of the container is suddenly decreased to one-half of its original volume, causing the pressure to double, what will happen to the amount of NO and O2 present at equilibrium? Calculate the new equilibrium concentrations of NO and O2.

asked Jan 22 in Chemical equilibrium by MarcellaMack (1.7k points)

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Why is the trait theory important to psychology?

asked Jan 20 in Psychology by LucieGriego4 (2.1k points)

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A student attempted to produce 25 grams of product by performing a chemical reaction, but only obtained 18 grams. What was the percent yield for this reaction?

asked Jan 22 in Chemical reactions by JannetteBarr (2.2k points)

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What is the structure of an unknown organic compound that exhibits a strong absorption at 1720 cm-1 in its IR spectrum? Use IR spectroscopy to analyze the sample and propose a possible structural formula.

asked Jan 21 in Organic Chemistry by MariRosetta0 (2.2k points)

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1 answer 124 views

What is the dual-coding theory?

asked Jan 20 in Psychology by OtisMacGilli (2.0k points)

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A student synthesized a new compound by reacting magnesium with oxygen. The mass of magnesium used in the reaction was 0.25 grams and the mass of the resulting compound was 0.73 grams. Determine the empirical formula of the compound.

asked Jan 22 in Inorganic Chemistry by PrincessDial (2.0k points)

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A steel pipeline is being used to transport a chemical mixture containing sulfuric acid. Given the concentration of sulfuric acid in the mixture and the surface area of the pipeline, calculate the corrosion rate of the steel pipeline in millimeters per year. Show your calculation and explain the significance of the result.

asked Jan 22 in ElectroChemistry by HenryBorella (2.2k points)

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Where does the ecological approach place emphasis when evaluating visual illusions?

asked Jan 20 in Psychology by KaraGass5143 (2.3k points)

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How many different isomers can be obtained from hexane (C6H14)? Provide the structural formula of each isomer.

asked Jan 21 in Organic Chemistry by MarcellaR325 (2.2k points)

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An electrochemical cell has a standard emf of 1.10 V and a current of 0.500 A when operating at standard conditions. What is the power output of the cell?

asked Jan 22 in ElectroChemistry by FinleySalern (1.6k points)

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1 answer 82 views

Balancing a chemical equation for the reaction between sodium hydroxide and hydrochloric acid to produce sodium chloride and water.

asked Jan 21 in Inorganic Chemistry by CheryleKirso (2.1k points)

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1 answer 124 views

What were the ethical concerns regarding Zimbardo's prison experiment?

asked Jan 20 in Psychology by AmeliaCuella (1.8k points)

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1 answer 82 views

Balance the following chemical equation for the synthesis of ammonia (NH3) from nitrogen (N2) and hydrogen (H2) gas: N2 + H2 → NH3

asked Jan 21 in Inorganic Chemistry by RoyalShu7550 (1.9k points)

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1 answer 117 views

According to social cognitive theory, how can vicarious reinforcement affect behaviour?

asked Jan 20 in Psychology by MaxwellDuff3 (1.9k points)

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1 answer 131 views

According to the olfactory coding theory, how are smells represented in the brain?

asked Jan 20 in Psychology by CandyDemaio (2.3k points)

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1 answer 118 views

What is the social constructivist theory of cognitive development?

asked Jan 20 in Psychology by RichelleVerr (2.1k points)

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What is the name of the theory that suggests that our behaviour is influenced by our thoughts and emotions?

asked Jan 20 in Psychology by NFDRoman4328 (1.8k points)

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1 answer 119 views

How does the theory of attention relate to driving?

asked Jan 20 in Psychology by Indira29O642 (1.7k points)

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