06/25/21
Chemistry (endothermic and exothermic)
A chemical reaction absorbs energy when occurring. Is this reaction Exothermic or Endothermic? If the enthalpy of the reactants was 300kJ and the enthalpy of the products was 450kJ, list one...
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06/25/21
What is the value of Kc?
The reaction below has a Kp value of 41.0. What is the value of Kc for this reaction at 225. K?N2(g) + 3 H2(g) ⇌ 2 NH3(g)
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06/25/21
When are Kp and Kc equal for this reaction?
Under which circumstances are Kp and Kc equal for the reaction aA(g)+bB(g)⇌cC(g) ?
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06/25/21
Imagine you have two gases, X and Y. Gas X has a molar mass of 208 g/mol and Gas Y is 82 g/mol. Which gas is predicted to be the faster of the two? By how much?
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06/25/21
What is Δn for the following equation in relating Kc to Kp?
What is Δn for the following equation in relating Kc to Kp?4 NH3(g) + 3 O2(g) ⇌ 2 N2(g) + 6 H2O(g)
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06/24/21
What is the concentration?
The reaction X products is second order in X and has a rate constant of 0.035 M-1s-1. If a reaction mixture is initially 0.50 M in X, what is the concentration of X after 140. seconds?
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06/23/21
What is the average rate of the reaction?
Consider the following reaction:2 N2O(g) → 2 N2(g)+O2(g)In the first 12.0 seconds of the reaction, 1.9×10−2 mol of O2 is produced in a reaction vessel with a volume of 0.320 L. What is the average...
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06/23/21
General Chemistry
To treat a burn on his hand, a person decides to place an ice cube on the burned skin. The mass of the ice cube is 15.1g and its initial temperature is -13.6 C. The water resulting from the...
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06/23/21
What is the half life?
The rate constant for a second-order reaction is 0.54 M-1s-1. What is the half-life of this reaction if the initial concentration is 0.51 M?
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06/23/21
What is the magnitude?
A particular first-order reaction has a rate constant of 1.35 × 102 s-1 at 25.0°C. What is the magnitude of k at 35.0°C if Ea = 55.5 kJ/mol?
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06/22/21
Chemistry 122 d
Balance the following chemical reactions, determine the type of reaction and whether each is a redox reaction: (NH4)2Cr2O7 = N2 + H2O + Cr2O3
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06/22/21
Which of the following is nonpolar covalent molecule?
Which of the following is nonpolar covalent molecule?Select one:a. HClb. H2Oc. CCl4d. NH3
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06/22/21
Which of the following has the highest boiling point?
Which of the following has the highest boiling point?Select one:a. CCl4b. NaClc. HBrd. CH3CH2CH3
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06/22/21
General Chemistry
If an ideal gas has a pressure of 9.03 atm a temperature of 485 K and a volume of 76.05 L how many moles of gas are in the sample?n= mol
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06/22/21
ThermoChemistry
Liquid hydrogen peroxide is an oxidizing agent in rocket fuel mixtures because it decomposes to form oxygen, which is then used in the combustion of the rocket fuel. The reaction is:2 H2O2 (l) → 2...
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06/21/21
Enthalpy Changes
The reaction of hydrogen bromide(g) with chlorine(g) to form hydrogen chloride(g) and bromine(g) proceeds as follows:
2HBr(g) + Cl2(g)2HCl(g) + Br2(g)
When 31.2 g HBr(g) reacts with...
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06/21/21
Use Lewis electron dot diagrams to illustrate the chemical bond in the following items. Identify if its ionic or covalent
Use Lewis electron dot diagrams to illustrate the chemical bond in the following items. Identify if its ionic or covalentGallium Sulfide (GaS)
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06/21/21
HELP ME, DUE NOW!
Use Lewis electron dot diagrams to illustrate the chemical bond in the following items. Identify if its ionic or covalentMagnesium Iodide (MgI)
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06/20/21
To make a 1.00 m solution, one could take 1.00 moles of solute and add...
To make a 1.00 m solution, one could take 1.00 moles of solute and add
2.00 L of solvent.
enough solvent to make 1.00 L of solution.
enough solvent to make 1.00 kg of solution.
1.00 kg of...
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06/20/21
Which is the most polar solvent?
Identify the most polar solvent.
methane
diethyl ether
acetone
toluene
pentane
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06/20/21
What is the mole fraction?
Calculate the mole fraction of MgI2 in an aqueous solution prepared by dissolving 0.400 moles of MgI2 in 850.0 g of water.
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06/20/21
What is the molarity?
A solution is 0.0500 m CsI. What is the molarity of the solution if the density is 1.10 g/mL?
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06/20/21
Which has the larger hydration energy in each set?
Which cation in each set is expected to have the larger (more negative) hydration energy?I Li+ or Cs+II K+ or Al3+
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06/19/21
A scientist wants to make a solution of tribasic sodium phosphate?
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4Na3PO4, for a laboratory experiment. How many grams of Na3PO4Na3PO4 will be needed to produce 525 mLmL of a solution that...
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