04/07/22

Phase Changes : How much heat must be lost to freeze 75.3 g of water at 11°C?

How much heat must be lost to freeze 75.3 g of water at 11°C? 
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04/07/22

Ksp Chemistry Questions
2 scie‎ntists were tas‎ked to deter‎mine the iden‎tity of the hyd‎roxide solid, X(OH)2. In the exper‎iment they pr‎epared 500mL HCl titrant and was standard‎ized using 3 sets of Na2CO3 solid... more
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04/07/22

Gravimetric Analysis
In gra‎vimetric det‎ermination of Phospohrus, 0.2161 g Mg2P2O4 was obtai‎ned after preciptation of 0.3516 g det‎ergent sample. Cal‎culate the perce‎ntage of the phosphorus.
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04/07/22

How many liters of antimony (III) chloride can be produced from 35 L of chlorine at STP reacting with an excess of antimony? 2Sb + 3Cl2 → 2SbCl3
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04/07/22

Iron and HCl react to form iron(II) chloride and hydrogen gas. What mass of iron (II) chloride could be produced from 35.0 g of Fe and excess HCl?
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04/06/22

Predict whether or not a reaction occurs. Balance the reaction and answer the questions.

__ HCl ( ) + __ NaHCO3 ( ) -> __ Mg ( ) + __ O2 ( ) -> __ Ca(OH)2 ( ) + __ H2SO4 ( ) -> Identify the type of reaction (precipitation, acid-base, gas evolution, oxidation-reduction,... more
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04/06/22

Write the correct formula of the predicted products and add the state to each formula.

KClO4 (aq) + BaCl2 (aq) Pb(NO3)2 (aq) + LiBr (aq) KNO3 (aq) + AgC2H3O2 (aq) Na2CO3 (aq) + KCl (aq) Li3PO4 (aq) + BaS (aq) (NH4)2SO4 (aq) + CaCl2 (aq) Fe(C2H3O2)3 (aq) + KOH (aq) Does a... more
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04/06/22

A solution of Fe(NO3)3 (aq) and a solution of KIO3 (aq) are mixed and a white precipitate forms. (IO3 is a polyatomic ion much like ClO3)
What is the formula of the precipitate? Explain your reasoning.
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04/06/22

What volume of carbon dioxide gas will be produced when 5.45 L of methane and 7.35 L of oxygen gas are allowed to react at 30.0 Celsius and 1.02 bar?

Balanced chemical equation:CH4 (g) + 2 O2 (g) --> CO2 (g) + 2 H2O (g)
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04/06/22

Enter the solubility expression for Mg3(PO4)2(s) . 𝐾sp=

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04/05/22

Made and broken bonds (Please Help for homework)
Types of broken bonds in the equation:4C7H5N3O6 + 21O2 --> 28CO2 + 10H2O + 6N2
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04/05/22

Write the molecular, complete ionic, and net ionic equations for each of the possible reactions.

Possible reactions: Ba(NO3)2 (aq) + KI (aq) Ba(NO3)2 (aq) + NiSO4 (aq) Ba(NO3)2 (aq) + K2CrO4 (aq) AgNO3 (aq) + KI (aq) AgNO3 (aq) + NiSO4 (aq) AgNO3 (aq) + K2CrO4 (aq) Do any of the net ionic... more
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04/05/22

A reaction has a standard free‑energy change of −17.00 kJ mol−1(−4.063 kcal mol−1). Calculate the equilibrium constant for the reaction at 25 °C.
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04/05/22

A galvanic (voltaic) cell consists of an inert platinum electrode in a solution containing 1.0 M tin(IV) ion and 1.0 M tin(II) ion,

and another inert platinum electrode in a solution containing 1.0 M cobalt(III) ion and 1.0 M cobalt(II) ion, connected by a salt bridge. Calculate the standard potential for this cell at ... more
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04/05/22

Calculate the concentration of this sulfuric acid solution.

A fine titration is performed on a different sulfuric acid sample. When a 12.00 mL sample of the sulfuric acid is titrated with 0.241 M sodium hydroxide to the endpoint, the initial and final buret... more
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04/05/22

A course titration is performed on a 3.00 mL sample of sulfuric acid with a 0.241 M sodium hydroxide solution.
A course titration is performed on a 3.00 mL sample of sulfuric acid with a 0.241 M sodium hydroxide solution. The initial and final buret readings for the titration to the endpoint were 0.35 mL... more
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04/05/22

S + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2O In the above equation, how many grams of water can be made when 9.8 moles of HNO3 are consumed?

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04/05/22

How many liters of oxygen gas are required to react with 2.25 L of methane at 21.0 C and 0.997 atm?
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04/05/22

Solutions: Calculating Concentrations including Dilution
Calculate the concentration (mole fraction) of KCl in a solution prepared by dissolving 12.00 kg of KCl in 250.0 mL of water at 20 degrees celsius.
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04/05/22

Chem question please help
A 9.65 L container holds a mixture of two gases at 33 °C. The partial pressures of gas A and gas B, respectively, are 0.429 atm and 0.605 atm. If 0.150 mol of a third gas is added with no change in... more
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04/04/22

stock concentration
If your stock solution has a concentration of 0.75 M and you want to make 250 mL of a solution that has a concentration of 4.8×10-2 M, how much stock solution will you need in ml?
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04/04/22

Rank the molecules from highest boiling point to lowest boiling point.

Arrange the molecules in order of decreasing boiling point.H2 HBr C2H50H
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04/04/22

Draw resonance structures for each of the following molecules or ions.
OCN- (negative N-) Draw all the molecules by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms and all lone pairs of electrons. Show the charge of the ion over... more
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04/04/22

Using the heat of fusion of water, 334 J/g , calculate the grams of ice that will melt at 0 ∘C if 1510 J is absorbed.
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04/04/22

At the boiling point of nitrogen, N2 , how many joules are needed to vaporize 14.6 g of N2 ? Liquid nitrogen has a heat of vaporization of 198 J/g at its boiling point
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