25,963 Answered Questions for the topic chemistry

Chemistry

04/01/23

How many moles of C₄H₁₀ (isobutane) must be reacted according to the following balanced chemical reaction to transfer -187.5 kJ of heat? 2 C₄H₁₀(g) + 13 O₂(g) → 8 CO₂(g) + 10 H₂O(g) ∆H = -2868.8 kJ
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04/01/23

How can I increase the packing factor and at the same time create more void space in a crystalline structure of a refractory material?
How can I optimize the packing factor and at the same time create more void space in a crystalline structure of a refractory material?
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Chemistry

04/01/23

What concentration (in M) of the strong base NaOH is required to obtain an aqueous solution with the pH value of 13.2?
What concentration (in M) of the strong base NaOH is required to obtain an aqueous solution with the pH value of 13.2?
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04/01/23

Photosynthesis: Photosystem ll
What is the general question that you want to ask about Photosystem II that will be experimental for a lab? What specific, testable hypothesis can you generate from that? The hypothesis must be... more
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04/01/23

Photosynthesis: Photosystem ll
What is the effect of temperature on Photosystem II's electron transfer rate and efficiency the presence of inhibitors, such as herbicides specifically glyphosate?
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04/01/23

Photosynthesis: Photosystem ll
How does changing the wavelength of light affect Photosystem II's ability to generate ATP and NADPH with the idea of the hypothesis being that changing the wavelength of light will affect the rate... more
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Chemistry

03/31/23

Write the buffer solution equation then write two chemical equations showing how a buffer reacts with a). NaOH and b). HCl. Please explain which component of the buffer reacts with each.
Write the buffer solution equation then write two chemical equations showing how a buffer reacts with a). NaOH and b). HCl. Please explain which component of the buffer reacts with each.Context: 15... more
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Chemistry

03/31/23

A volume of 500.0 mL of 0.130 M NaOH is added to 605 mL of 0.200 M weak acid (𝐾a=3.87×10−5). What is the pH of the resulting buffer?
HA(aq)+OH−(aq)⟶H2O(l)+A−(aq)pH=?
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Chemistry

03/31/23

Calculate the pH at the equivalence point for the titration of 0.200 M methylamine (CH3NH2) with 0.200 M HCl. The 𝐾b of methylamine is 5.0×10−4.
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Chemistry

03/31/23

25.00 mL of a H2SO4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 41.85 mL of a 0.1299 M NaOH solution.
What is the concentration of the H2SO4 solution?[H2SO4]=?
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Chemistry

03/31/23

May I please get help on this?
Calculate the pH of the resulting solution if 28.0 mL of 0.280 M HCl(aq) is added to 38.0 mL of 0.280 M NaOH(aq).andCalculate the pH of the resulting solution if 28.0 mL of 0.280 M... more
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Chemistry

03/31/23

Strong acid-strong base titration relies on the reaction of a stong acid with a strong base.
Complete each titration reaction by writing the products in molecular form and balancing the equation. States of matter are optional.HCL+KOH->H2SO4+NaOH->
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Chemistry

03/31/23

May I get help on this?
A 1.42 L buffer solution consists of 0.168 M butanoic acid and 0.302 M sodium butanoate. Calculate the pH of the solution following the addition of 0.061 moles of NaOH. Assume that any contribution... more
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Chemistry

03/31/23

Can I get help on this?
A 1.42 L buffer solution consists of 0.310 M propanoic acid and 0.199 M sodium propanoate. Calculate the pH of the solution following the addition of 0.076 mol HCl. Assume that any contribution of... more
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Chemistry

03/31/23

Colligative properties

Solvent water freezing point 0 degrees Celsius, Kf 1.86 boiling point 100 degrees Celsius, Kb 0.512, vapor pressure 2.33kpa1) 5.7 grams of calcium bromide are dissolved in 50.0 mL of water.... more
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Chemistry

03/31/23

Chemistry question

Compare unsaturated, supersaturated, and saturated solutions.
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Chemistry

03/30/23

Chemistry question

Why is it important to be able to calculate solubility of a solution? What are the potential benefits?
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Chemistry

03/30/23

Chemistry question

Give an example of a solution and identify the solute and solvent.
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Chemistry

03/30/23

Which of the following chemical equations shows how NaC2H3O2 produces a basic (alkaline) solution?
A 0.10 M NaC2H3O2 (sodium acetate) solution in water has a pH of 8.4. Sodium acetate dissolved in water produces sodium ions and acetate ions. The acetate ion, C2H3O2-, is the conjugate base of... more
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Chemistry

03/30/23

Calculate the pKa of HA
A buffer is prepared by adding 25 mL of 0.10 M HA ( a weak acid) to 15 mL of 0.10 M NaA (the salt of its conjugate base). The measured pH of the buffer is 3.48. Calculate the pKa of HA. (Hint: Use... more
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Chemistry

03/30/23

calculating enthalpy
Given the thermochemical equationsX2+3Y2⟶2XY3Δ𝐻1=−370 kJX2+3Y2⟶2XY3Δ�1=−370 kJX2+2Z2⟶2XZ2Δ𝐻2=−130 kJX2+2Z2⟶2XZ2Δ�2=−130 kJ2Y2+Z2⟶2Y2ZΔ𝐻3=−220 kJ2Y2+Z2⟶2Y2ZΔ�3=−220 kJCalculate the change in... more
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Chemistry

03/30/23

Solid Precipitate/ Excess Reactant Chem Question
If a solution containing 27.24 g of mercury(II) acetate is allowed to react completely with a solution containing 8.564 g of sodium dichromate, how many grams of solid precipitate will form?
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Chemistry

03/30/23

The partial pressure of CH4(g) is 0.175 atm and that of O2(g) is 0.250 atm in a mixture of the two gases. What is the mole fraction of each gas in the mixture?
The partial pressure of CH4(g) is 0.175 atm and that of O2(g) is 0.250 atm in a mixture of the two gases. What is the mole fraction of each gas in the mixture?
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Chemistry

03/30/23

If 4.000 grams of hydrogen peroxide is placed within a sealed 250.0 mL container at 500.0 K. What is the pressure of the oxygen gas produced in atmosphere?
If 4.000 grams of hydrogen peroxide is placed within a sealed 250.0 mL container at 500.0 K. What is the pressure of the oxygen gas produced in atmosphere?
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Chemistry

03/30/23

A 50.0 L sealed cylinder contains 100.0 moles of helium gas. Its pressure at 273.0 K is 44.8 atm. What is the pressure when the gas is heated to 500.0 K.

A 50.0 L sealed cylinder contains 100.0 moles of helium gas. Its pressure at 273.0 K is 44.8 atm. What is the pressure when the gas is heated to 500.0 K.
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