12/12/21

Question in Chemistry
W‎hat will happe‎n if a s‎aturated soluti‎on of Ca(‎OH)2 init‎ially at roo‎m tem‎perature is heate‎d to 75°‎C?Ca‎(OH)2(s) ⇌ C‎a2+(a‎q) + 2 O‎H-(a‎q)     Δ°Hrx‎n = -16.7 k‎J mol-‎1 A. The reve‎rse... more
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12/11/21

What happens if a large volume of hypotonic solution is administered intravenously? What about if it is a hypertonic solution?
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12/11/21

Problem 4: How is the effect of a catalyst on a reaction explained by collision theory? Use a potential energy diagram sketch with a description to answer this question. *
Problem 4: How is the effect of a catalyst on a reaction explained by collision theory? Use a potential energy diagram sketch with a description to answer this question. *
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12/11/21

Using the data in the table, find the value and units of the rate constant, k, and then write the complete rate law equation for this reaction.
Using the data in the table, find the value and units of the rate constant, k, and then write the complete rate law equation for this reaction.
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12/11/21

problem solving
Problem 1: For the reaction: H₂O₂ + 3I⁻ + 2H⁺ ⟶ I₃⁻ + H₂O four experiments studying initial concentrations and initial rates are performed. The data are summarized in the table found below.Answer... more
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12/11/21

Chemistry Problem

Write the following compounds' structural formula, electron dot formula, molecular shape, bond polarity (P or NP) and Molecular polarity (P or NP)Compounds: CO(NH2)2 , N2H4, C2H4, C6H12
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12/10/21

Chemistry Bonding Covalent Structures
Write the following compounds' structural formula, electron dot formula, molecular shape, bond polarity (P or NP) and Molecular polarity (P or NP)Compounds: H2O2, HCOOH, CO(NH2)2 , N2H4, C2H4,... more
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12/10/21

What is the density and molar mass of the gas?
A 1.55g sample of an unknown gas at 69°C and 1.10 atm is stored in a 1.55 L flask.What is the density of the gas? (g/LWhat is the molar mass of the gas? (g/mol)
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12/10/21

Determining the percentage composition of Vinegar.
In this lab, we were titrating CH₃COOH with NaOH. we used an average of 33.433 mL of 0.7 molarity NaOH to neutralize 25mL of CH₃COOH. The questions are:calculate the moles of NaOH from the average... more
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12/10/21

Chemistry Bonding Covalent Structures

Write the following elements structural formula, electron dot formula, molecular shape, bond polarity (P or NP) and Molecular polarity (P or NP)Elements: H2O2, HCOOH, HCN, CO(NH2)2 , N2H4, C2H4,... more
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12/10/21

Chemistry Covalent Structures Bonding

Write the following elements structural formula, electron dot formula, molecular shape, bond polarity (P or NP) and Molecular polarity (P or NP) Elements: NH3, CH4, CCl4, CCl2F2, C2H2, CH2O, CH3CH2OH
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12/10/21

what is the molarity of unknown HCL from the known NaOH concentration.
we did this titration lab and I got the following info. We used 6.8333 mL average of 0.7 molarity NaOH to neutralize 25.00 mL of HCL. what are the moles, molarity, ph the of the HCL in this lab?... more
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12/10/21

How much heat is released when 44.1 g of propane is burned?
The reaction for the combustion of propane isHow much heat is released when  of propane is burned?C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(l)Δ𝐻=−526.3kcalmol
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12/09/21

Equilibrium Question
0.450 mol of hydrogen bromide gas decomposes in a 0.75 L container according to the reaction below:2 HBr(g)  ↔ H2(g) +  Br2(l)At equilibrium the concentration of H2(g) was found to be 0.132 mol/L.... more
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12/09/21

Chem 30 - The Constant Equilibrium
Once you have balanced the following chemical equation, choose the correct corresponding equilibrium law expression:Ag2CO3(s)  ↔ Ag(s)  + CO2(g)  + O2(g) Kc=?
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12/09/21

How much solid solute (in grams) would need to be measured out if you wanted to create a 1.25M CuSO4 solution with a volume of 100.0mL?
How much solid solute (in grams) would need to be measured out if you wanted to create a 1.25M CuSO4 solution with a volume of 100.0mL?
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12/09/21

MOLECULAR GEOMETRY OF AMMONIA
Tell me if I indicated the right statements that would describe the molecular geometry of NH3 (Ammonia) if not, please kindly correct me.a. General Formula : AX3Eb. Total Number of Electron Domains... more
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12/09/21

Ap Chem solubility and precipitation
Consider each of the following aqueous solutions being mixed. Based on solubility rules, determine whether a reaction will occur or not. If a reaction will occur:a. Write a complete balanced... more
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12/09/21

AP Chem solubility and precipitation
Write a balanced equation, with state symbols, to show the dissociation of each of the following ionic solids when they are dissolved in water.a. __K2S (s) -->b. __Ni(NO3)2 (s) --> c.... more
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12/09/21

AP chem titrations
5.00 grams of a mixture of sodium carbonate and potassium bromide were dissolved to make 250. mL solution in a volumetric flask. A 25.0 mL portion of this solution was neutralized by 25.7 mL of... more
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12/09/21

AP Chem Titrations
Limestone can be considered to essentially be calcium carbonate. Acid rain, for the purposes of the question, will be considered sulfuric acid. When limestone buildings are eroded by acid rain the... more
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12/09/21

By titration, it is found that 95.9 mL of 0.191 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.
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12/09/21

What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=1.3×10−9 M?

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12/09/21

CHEMISTRY QUESTION
For the thermochemical reaction: C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) ΔH = -1367.1 kJ. Draw the potential energy diagram that illustrates the enthalpy change in this reaction and state whether... more
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12/09/21

CHEMISTRY QUESTION
A calorimeter that contains 3.6 L of water is used to measure the enthalpy of solution for 45 g of KOH. Calculate the molar enthalpy of solution that is associated with the reaction if the... more
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