05/12/21

A solution has OH- concentration as 1.0 x 10^-3. pH of this solution is:
A) 11B) 10C) -11D) 9
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05/12/21

Heat calculation
Calculate the specific heat of a metal if a 38 g sample of the metal was heated to 50° C and placed in 50.0g of water at 25°C. The final temperature of mixture was 28° C.
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05/12/21

Calculating Enthalpy, Entropy, and Molar Enthalpy in a calorimeter experiment? PLEASE HELP!
When 3g of Ammonium Chloride is added to 10ml of water in a calorimeter, the temperature over a five-minute period drops from 27.1 degrees celsius to 19.8 degrees celsius. The table of the results... more
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05/12/21

Is Ammonium Chloride (NH4CL) an endothermic reaction when in water?
I was wondering if Ammonium Chloride is an endothermic reaction when mixed with water in a calorimeter and what the effect of increasing the amount of water in the calorimeter would have on the... more
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05/12/21

Determine the expected freezing point of a calcium chloride solution prepared at room temp. from 2.55kg of calcium chloride and 33.8L of water.
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05/12/21

Solutions of lithium carbonate and magnesium chloride are combined.
a) Identify any precipitate(s) that will form.b) Write the balanced molecular equation, including the state of each substance.c) Write the ionic equation, including the state of each substance.d)... more
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05/12/21

Explain why the vapor pressure of salt water is lower than the vapor pressure of water.

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05/11/21

How much heat must be added to 50.0 g of aluminum at 25oC to raise its temperature to 125oC? The specific heat of aluminum is 0.90 J/goC.
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05/11/21

Suppose a piece of iron with a mass of 21.5 g at a temp of 100.0 °C is dropped into an insulated container of water.

The mass of the water is 132.0 g and its temperature before adding the iron is 20.0°C. What will be the final temp of the system? Specific heat of iron is 0.46 J/goC.
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05/11/21

How to make this the same as the equation given from my teacher？
MnO4^- + Fe^+2 →reductionH2O2 → decomposesMnO4^- +H2O2 → reduction The equation given from my teacher8H^+ +MnO4^- +5Fe^+2 → 5Fe^+2 +Mn^+2 +4H2OMnO4^- + Fe^+2 → Fe^+3 +Mn^+2
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05/11/21

Which of the following is the approximate ΔS° for the reaction?
2AgNO3(aq)+CaBr2(aq)→2AgBr(s)+Ca(NO3)2(aq)Substance:AgNO3(aq) Approximate S°  (J/mol K): 220 Substance:CaBr2(aq) Approximate S°  (J/mol K):72 Substance:AgBr(s) Approximate... more
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05/11/21

In a acid dry cell battery....
In a acid dry cell battery for which the reaction is Zn + 2 NH4Cl + 2 MnO2 → ZnCl2 + 2 NH3 + Mn2O3 + H2O, what atom is reduced?a. O b. Cl c. Mn d. Zn e. N
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05/11/21

In a acid dry cell battery...
In a acid dry cell battery for which the reaction is Zn + 2 NH4Cl + 2 MnO2 → ZnCl2 + 2 NH3 + Mn2O3 + H2O, what acts as the oxidizing agent?a. MnO2 b. NH4Cl c. Zn d. ZnCl2 e. Mn2O3
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05/11/21

What is the standard cell potential for the following reaction?
Cr3+(aq) + 3e- Cr(s); Eo = -0.74V Pb2+(aq) + 2e- Pb(s); Eo = -0.13V What is the standard cell potential for the following reaction? 2Cr(s) + 3Pb2+ 3Pb(s) + 2Cr3+(aq)a. –0.61V b. –0.87V c. 1.83 Vd.... more
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05/11/21

Which of the following cations is capable of oxidizing...
Given:Pb2+(aq) + 2e– --> Pb(s); E° = –0.13 VZn2+(aq) + 2e– --> Zn(s); E° = –0.76 VAl3+(aq) + 3e– --> Al(s); E° = –1.66 VMg2+(aq) + 2e– -->  Mg(s); E° = –2.38 VV2+(aq) + 2e– -->... more
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05/11/21

Consider the following cell reaction....
Consider the following cell reaction:2Hg2+(aq) + H2(g) → 2H+(aq) + Hg22+(aq); E°cell = 0.92 VUnder standard-state conditions, what is E° for the following half-reaction?Hg2+(aq) + 2e– → Hg22+(aq)
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05/11/21

Consider the following reduction potentials...
Consider the following reduction potentials:Cd2+(aq) + 2e– --> Cd(s); E° = –0.40 VPb2+(aq) + 2e– --> Pb(s); E° = –0.13 VCu2+(aq) + 2e– --> Cu(s); E° = 0.34 VBr2(l) + 2e– -->... more
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05/11/21

A gas is held under conditions of standard temperature and pressure. It is found that 44.0 grams of the gas occupies a volume of 22.4 L under these conditions. What is the gas?
CO2F2O2Cl2N2
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05/11/21

I NEED HELP ASAP
what is the ksp when there is a molar solubility of 8.3e-2 M?
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05/11/21

I NEED HELP ASAP
which of the following Ksp is more likely to favor products?1) aluminum hydroxide ; Ksp 3x10^-34or 2) barium bromate Ba(BrO3)2 , Ksp 2.43x10^-4
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05/11/21

I NEED HELP ASAP
calculate the ph of a 0.5 m solution of acetic acid. acetic acid has a dissociation constant of 1.8x10^-5
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05/11/21

i need help asap
You have 1.5 M stock solution of HCI, Your experiment calls for a concentration of 3.36e-3M, which of the following is the correct procedure for achieving this concentration ?1)Adding 100 mL of 1.5... more
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05/11/21

i need help asap
Which of the following correctly describes how to make 2.9 M solutiion of aqueous HF ? 1) Obtain 2.90g of HF crystals , add to volumetric flask and then dilute to the 1.0 L line. 2) Obtain 5.8 g of... more
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05/11/21

Would the difference be like 2nd and 3rd degree burns?
The specific heat of ethanol is 2.46. If you spill boiling alcohol on yourself, would there be any difference in the severity of that burn compared to the burn caused by boiling water? Explain your... more
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05/10/21

On a hot day, you may have noticed a bag of potato chips seems to “inflate.” If I have a 250. mL bag at a temperature of 292 K,
On a hot day, you may have noticed a bag of potato chips seems to “inflate.” If I have a 250. mL bag at a temperature of 292 K, and I leave it in my car that reaches a temperature of 333 K, what... more
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