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Colligative Properties – Level 2 Which of the following solu…
Colligative Properties – Level 2 Which of the following solutions would have the lowest melting point?Assume full dissociation for all species and each solution is aqueous.
Hess’s Law – System vs. Surroundings – Level 1 When a stude…
Hess’s Law – System vs. Surroundings – Level 1 When a student dissolves a salt in water inside a coffee-cup calorimeter, the temperature of the solution drops noticeably because a dissolution reaction occurs. Which statement best describes what is happening in terms of the system and surroundings?
Terminology – Spectroscopy – Level 1 Examine the following f…
Terminology – Spectroscopy – Level 1 Examine the following figure and determine the correct terminology that describes the spectroscopic shift for “II” (the one on the right).
Level 1 – Solubility Equations and Recrystallization A stude…
Level 1 – Solubility Equations and Recrystallization A student determined the following data experimentally:1 mg of compound A dissolves in 100 mL of solvent at 0oC.10 mg of compound A dissolves in 1 mL of a solvent at 100oC. Using this data, the student intends to perform a recrystallization on a larger scale. Calculate the minimum volume of solvent required for dissolving 50 g of compound A.
Absorbance vs Transmittance – Level 1 Convert Abs of 0.24 to…
Absorbance vs Transmittance – Level 1 Convert Abs of 0.24 to % Transmittance.
Hess’s Law – Level 2 You are performing a reaction in a coff…
Hess’s Law – Level 2 You are performing a reaction in a coffee cup calorimeter. You add a 1.00 g piece of magnesium metal (Mg) to 100.0 mL of 1.00 M hydrochloric acid (HCl). The reaction that occurs is:Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)During the reaction, the temperature of the solution increases from 25.0°C to 32.5°C. Assume the specific heat capacity of the solution is the same as water, 4.18 J/g°C, and the density of the solution is 1.00 g/mL.Calculate the enthalpy change of the reaction (ΔH) using Hess’s Law.
Dye Absorbance and Transition Energy – Level 2 Four differen…
Dye Absorbance and Transition Energy – Level 2 Four different dyes each absorb light at a different maximum wavelength (λmax): Dye λₘₐₓ (nm) A 350 nm B 425 nm C 510 nm D 615 nm Which of these dyes absorbs photons with the the highest energy?
VESPR – Level 2 – Isomers How many isomers are possible for…
VESPR – Level 2 – Isomers How many isomers are possible for the following molecular formula given the following constraint: Molecular Formula: C3H8O You may only use single bonds. Only use constitutional isomers, do not consider chirality. No atoms may have a charge.
Hess’s Law – Line Addition – Level 3 Use the following therm…
Hess’s Law – Line Addition – Level 3 Use the following thermochemical equations to determine the enthalpy change (ΔH) for the target reaction: C(graphite)+2H2 (g)→CH4 (g) Given reactions: C(graphite) + O2 (g)→CO2 (g) ΔH1=-393.5 kJ2H2 (g) + O2 (g)→2H2 O(l) ΔH2=-571.6 kJCH4 (g) + 2O2 (g)→CO2 (g) + 2H2O(l) ΔH3=-890.3 kJ Question: Using Hess’s Law, what is ΔH° for C(graphite)+2H2 (g)→CH4 (g)?