05/01/20

Hess’s Law: One Reaction
The standard enthalpy change for the following reaction is 3.35×103 kJ at 298 K.2 Al2O3(s) 4 Al(s) + 3 O2(g) ΔH° = 3.35×103 kJWhat is the standard enthalpy change for this reaction at 298... more
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05/01/20

Coffee Cup Calorimetry: Heat of Solution
1) When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter.In the laboratory a general chemistry... more
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05/01/20

Specific Heat Capacity: Find Temperature
1) A sample of solid titanium is heated with an electrical coil. If 103 Joules of energy are added to a 10.6 gram sample initially at 21.1°C, what is the final temperature of the titanium?2) A... more
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05/01/20

what type of reaction is it? and balance the reactions
___ NaS + ___ ZnNO3 --> ___ NaNO3 + ____ ZnS___ Li + ___ N2 --> ___Li3N
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05/01/20

Calculate the value of the equilibrium constant ( K) for the following balanced redox reaction at 25°C. Pb 2+(aq) + Cu(s) → Pb(s) + Cu 2+(aq) E° = -0.47 V

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05/01/20

When you mix two solutions and a precipitate forms what does that mean happened?
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05/01/20

If I add 3g of KNO3 to a solution of KNO3 and all of it settles at the bottom as a precipitate what was the original solution? Group of answer choices supersaturated saturated unsaturated unknown
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05/01/20

If you add 5 g of salt to salt water and all of it dissolves what was the original solution?
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05/01/20

what particle decay is this? 226 Ra→ 88 222 Rn + ___
what particle decay is this? 226 Ra--> 88 222 Rn + ___
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05/01/20

Chemistry answer
How many moles of H2 S04 is need to neutralize 19.23 mole of Ba(0h)2
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05/01/20

Determine the value of K for the reaction, 2 NOCl(g) <=> O2(g) + N2(g) + Cl2(g)
by combining the equations below to give the needed equation and using their K values to calculate the K value of that equation.1/2 N2(g) + 1/2 O2(g) <=> NO(g)         K = 0.0112NO(g) + 1/2... more
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05/01/20

The following mechanism has been proposed for the reaction, A2 + 2 B → 2 P. Use these elementary steps in the mechanism shown below to derive the rate law.
From the rate law that you derive, determine the overall order of the reaction.A2 <=> 2 A  FastA + B → P   Slow
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04/30/20

b. How many liters of CO2 would be produced from the reaction of 3.50 L of C4H10O and 2.00 L of O2 at 1.00 atm and 25 °C?

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04/30/20

If you start with 5.5 grams of lithium chloride and add that to calcium hydroxide, how many grams of calcium chloride will be produced?
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04/30/20

Finding the difference in solubility
Consider the solubility of Ca(OH)2 in each of the following solutions. For each solution, indicate whether the Ca(OH)2 solubility will increase, decrease, or not change as compared to the... more
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04/30/20

Finding the Ksp value of Ca(OH)2
A student determined the solubility of Ca(OH)2 in 0.200 M CaCl2 as 0.0026 mol/L. Calculate the Ksp value for Ca(OH)2 using these data. I found this to be =7.03E-8, but it says that I have entered... more
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04/30/20

35.0 mL of 0.15 M H2SO4 are titrated with 24.85 mL of KOH. a. Write a balanced equation for this titration. b. Determine molarity of KOH.

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04/30/20

Chem help please.1?

What is the emf of this cell when [Fe^ 2+ ]=1.1M [Fe^ 3+ ] =2.0*10^ -2 M,P O 2 = 0.45 atm and the pH of the solution in the cathode compartment is 3.2.A voltaic cell utilizes the following... more
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04/30/20

Describe making a buffer and choosing the materials
Describe how to make a buffer which will have the maximum ability to resist changes in pH when either reasonable amounts of strong acid or strong base are added. How would you choose the materials... more
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04/30/20

Reasons why ideal gas law is like colligative property?
A friend tells you that the ideal gas law in his mind is somewhat like a colligative property. After thinking about it you find that there are reasons to agree. What are they?
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04/30/20

Find the rate law for the reaction and describe the mathematical relationship between the overall rate constant, k, and the rate constants for the elementary steps.
The two-step mechanism below has been proposed for the reaction 2 NO(g) + O2(g) → 2 NO2(g)which is believed to be responsible for the conversion of NO in automobile exhaust to NO2. 2... more
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04/30/20

Determine Ksp given molar solubility
Determine Ksp for the sparingly soluble MgF2, given its molar solubility is 1.2 X 10-3 mol/L
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04/30/20

For the following reaction, find Kc at 25°C
For the following reaction, find Kc at 25°C.NH4HS(s)    H2S(g) + NH3(g)       ΔG° = 17.5 kJ at 25°C
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04/30/20

What is the standard cell potential for the reaction below?
What is the standard cell potential for the reaction below?Mg(s) + Br2(l) → Mg2+(aq) + 2 Br-(aq)          The standard reduction potential is -2.37 V for the Mg2+/Mg half-cell and +1.09 V for the... more
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04/30/20

volume of Hydrogen gas?
The volume of hydrogen gas at 38.0ᵒC and 763 torr that can be produced by the reaction of 4.33 grams of zinc with excess sulfuric acid is
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