11/11/20

Why is the equivalence point so steep?
Hi!As the title suggests, I would like to know why the equivalence point in a titration curve is so steep? I know that the titration curve is logarithmic, because pH is logarithmic, but why will it... more
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11/11/20

alculate the molarity of a solution of Nitric Acid (HNO3) if it is 71% pure HNO3 and has a specific gravity of 1.43? (Atomic weight of H=1, N=14, O=16).
answer fast lol , I have an exam rnI hope I don't fail thanksssss
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11/11/20

Express the pressure numerically in torr.
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals... more
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11/11/20

oxidation number

What is the oxidation number of S in the compound Na₂S₂O₅?
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11/11/20

Chemistry 4HCl(aq)+MnO2(s)⟶MnCl2(aq)+2H2O(l)+Cl2(g)
7. 4HCl(aq)+MnO2(s)⟶MnCl2(aq)+2H2O(l)+Cl2(g)A sample of 40.3 g MnO2 is added to a solution containing 50.5 g HCl.(a) If the yield of the reaction is 87.1% what is the actual yield of chlorine?(b)... more
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11/10/20

Enthalpy of formation
Using standard heats of formation, calculate the standard enthalpy change for the following reaction.2H2O(l)2H2(g) + O2(g)
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11/10/20

What volume in mL of 1.62 M NaOH is required to react with 26.9 of 1.25 M citric acid according to the following reaction? H3 C6H5O7 (aq)+3NaOH(aq) 3H 2 O(l)+Na 3 C 6 H 5 O 7 (aq)
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11/10/20

Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level 𝑛=4 to the level 𝑛=1.
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11/10/20

Using the provided table, determine the enthalpy for the reaction 2 K(s) + 2 H₂O(l) → 2 KOH (aq) + H₂(g)
Using the provided table, determine the enthalpy for the reaction 2 K(s) + 2 H₂O(l) → 2 KOH (aq) + H₂(g)Tablesubstance ΔHf°(kJ/mol)K(s) 0H2O (I) -285.8KOH (aq) ... more
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11/10/20

How many moles of H₂ are required to produce -2501 kJ of heat in the following reaction? N₂ (g) + 3 H₂ (g) → 2 NH₃ (g) ∆H° = -91.8 kJ/mol
How many moles of H₂ are required to produce -2501 kJ of heat in the following reaction? N₂ (g) + 3 H₂ (g) → 2 NH₃ (g) ∆H° = -91.8 kJ/mol
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11/10/20

Consider the reaction: N2 (g) + 3 H2 (g) 2 NH3 (g) Kc = 152 at 225°C
Calculate the concentration of H2 at equilibrium, if [NH3] = 0.117 M and [N2] = 0.0935 M.
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11/10/20

2 CH4 (g) ----- > C2H2 (g) + 3 H2 (g)
A mixture of CH4, C2H2 and H2 reached equilibrium at 1,700°C. The concentrations were measured as: [CH4] = 0.0203 M, [C2H2] = 0.0451 M, and [H2] = 0.112 M. Calculate the equilibrium constant of... more
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11/10/20

A certain chemical reaction has an equilibrium constant of 1.8 x 10^-5
A certain chemical reaction has an equilibrium constant of 1.8 x 10^-5. Which is correct?1 At equilibrium the products will be favored2 At equilibrium the reactants will be favored 3 Not enough... more
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11/10/20

Were the values for your calculated and experimental If the values were not equaldoes this mean your experimental values are wrong? Why or why not?
And based on your answer , comment on the percent error from your moles of water procedure ( what could be done to improve the % error)
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11/09/20

Given four chemical bonds, Determine if each of the statement is True or False.
C―Si    C=C     C≡N   C=N1) There are three bonding pairs between C and N in a C≡N bond. ["True", "False"]       2) The C=O bond is stronger than the C=N bond because O is larger than N. ["False",... more
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11/09/20

Choose the compound that should have the highest melting point according to the ionic bonding model.
Group of answer choices(a) KI(b) CaO(c) SrCl2(d) CaS
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11/09/20

Place the following compounds in order of increasing magnitude of lattice energy
Ga2O3   RbI  MgS   K2S   
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11/09/20

pH in a titration curve
Hi!In my titration curve for HCl being titrated with NaOH, the initial pH-value was plotted as 2.1 according to a pH-meter. When I found the equivalence point and calculated the concentration of... more
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11/09/20

The A Hrxn for the reaction A+B C 16 kJ What is AHrxn for the reaction 3C* 3A+3B in kJ?
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11/09/20

Calorimetry and Heat Capacity
At constant volume, the heat of combustion of a particular compound is -3360.3 kJ/mol. When 1.541 g of this compound (molar mass is 128.08 g/mol) was burned in a bomb calorimeter, the temperature... more
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11/09/20

calculating partial pressure in gas mixture
A 5.00L tank at 4.43°C is filled with 5.42g of boron trifluoride gas and 8.12g of sulfur hexafluoride gas. You can assume both gases behave as ideal gases under these conditions.Calculate the mole... more
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11/09/20

According to the balanced reaction below, calculate the moles of NO2 that form when .00520 mole of N2O5 completely reacts: N₂O₅(g) → NO₂(g) + O₂(g)?
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11/09/20

A chemistry problem
Consider the following organic molecules.(a) Which of the substances pictured above would be insoluble in water? Explain in terms of the molecular structure for both the substance and for... more
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11/09/20

boyle's law Aleks question
A gas storage cylinder in an ordinary chemical laboratory measures 5.6 cm wide and 22. cm high. This is the label on it. Contents: N2 gas Pressure: 25.2 atm If the cylinder is opened and... more
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11/08/20

enthalpy and entropy
The combustion of acetylene gas produces carbon dioxide and water according to the following equation:2C2H2(g) + 5O2(g)→4CO2(g) + 2H2O(g)Use the following data to answer questions about the... more
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