25,963 Answered Questions for the topic chemistry

Chemistry Organic Chemistry

08/31/23

Chemistry help!
I think its the program but I know the answer is 87.5. I was wondering If anyone could help me set it up by chance.Question: What volume of 0.100 M HCl solution is needed to neutralize 25.0 mL of... more
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Chemistry

08/30/23

Determine the mass in grams of 0.248 gal of hexane. The density of hexane is 0.659 g/mL.
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Chemistry

08/29/23

50 mL of 0.2 M KOH is added to 150 mL of 0.1 M acetic acid. What is the pH change of the acetic acid solution caused by the addition of KOH? (Ka of acetic acid is 1.8x10-5)
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Chemistry

08/26/23

Match the terms fact, law, hypothesis, and theory with their definitions. (Hypothesis, fact, theory)
A generalization that concisely summarizes information about natural phenomena A tentative model or picture that offers an explanation for the behavior of a reactionA tentative model that has been... more
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Chemistry

08/25/23

A hypothetical element has two isotopes: 79.18% have a mass of 139.9 amu, while the rest are 164.8 amu. What is the atomic mass of this element?
A hypothetical element has two isotopes: 79.18% have a mass of 139.9 amu, while the rest are 164.8 amu. What is the atomic mass of this element?
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Chemistry

08/24/23

what is the equilibrium constant for the following reaction
At a certain temperature, the equilibrium constant K for the following reaction is ×5.0810−9H2(g)+Cl2(g)  2HCl(g)Use this information to answer the following question. what is the equilibrium... more
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Chemistry

08/24/23

Use this information to answer the following question. 
At a certain temperature, the equilibrium constant K for the following reaction is ×2.51x1012N2(g) + O2(g)  2NO(g)Use this information to answer the following question. Suppose a 44. L reaction... more
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Chemistry

08/24/23

Write the pressure equilibrium constant expression for this reaction. 
Chlorine and water react to form hydrogen chloride and oxygen, like this:2Cl2(g)+2H2O(g)→4HCl(g)+O2(g)Write the pressure equilibrium constant expression for this reaction. 
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Chemistry

08/24/23

Write the equilibrium constant expression for this reaction:
Write the equilibrium constant expression for this reaction:H2SO4(aq) → 2H+(aq)+SO2-4(aq)
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Chemistry

08/24/23

Calculate the mass of ZnCl2 that was dissolved.
A certain liquid X has a normal freezing point of −6.30°C and a freezing point depression constant Kf = 1.95·°C·kgmol-1. A solution is prepared by dissolving some zinc chloride (ZnCl2) in 500.... more
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Chemistry

08/24/23

Calculate the van't Hoff factor for potassium bromide in X.
When 263. g of alanine C3H7NO2 are dissolved in 800. g of a certain mystery liquid X, the freezing point of the solution is 8.0°C lower than the freezing point of pure X. On the other hand,... more
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Chemistry

08/24/23

Calculate the mass of NaCl that was dissolved
A certain liquid X has a normal freezing point of 1.30°C and a freezing point depression constant Kf = 5 .16·°C·kgmol-1. A solution is prepared by dissolving some sodium chloride (NaCl)... more
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Chemistry

08/24/23

Magnesium is the limiting reactant in this experiment. Calculate the theoretical yield of MgO for each trial using stoichiometry.

Mass of empty crucible with lid 26.689 g 26.687 g Length of ribbon cut 4 inches  2 inches  Mass of Mg metal, crucible, and lid 27.105 g 26.990 g Mass of MgO, crucible, and lid  27.367... more
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Chemistry

08/24/23

Calculate the boiling point of the solution
A certain liquid X has a normal boiling point of 129.00°C and a boiling point elevation constant Kb = 0.54·°C·kgmol-1.Calculate the boiling point of a solution made of 0.20 kg of iron(III) nitrate... more
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Chemistry

08/24/23

Calculate the molar mass of the protein
488 mg of an unknown protein are dissolved in enough solvent to make 5.00mL of solution. The osmotic pressure of this solution is measured to be 0.107atmat 25.0°C.Calculate the molar mass of the... more
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Chemistry

08/23/23

An experiment is performed on an unknown material and produces the given heat curve. The temperature of the material is shown as a function of heat added.
In the table, 𝑇1=48.2 °C, 𝐸1=173 J, 𝐸2=819 J, 𝐸3=1430 J, and 𝐸4=2870 J.Other experiments determine that the material has a temperature of fusion of 𝑇fusion=235 °C and a temperature of vaporization... more
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Chemistry

08/21/23

How do the measures firefighters take relate to the chemistry involved?
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08/20/23

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08/20/23

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Chemistry English Reading

08/20/23

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Chemistry English Physics Reading

08/20/23

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Chemistry Math English Reading

08/20/23

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Chemistry English Reading Spanish

08/20/23

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Chemistry English Reading

08/20/23

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08/20/23

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