02/01/24

Would a cleaner with a higher/lower boiling point be more ideal for cleaning a polar substance?
This is the question that my teacher posted, word by word. I am confused because I believe that it could go both ways. For example, lower boiling point would mean quicker evaporation, reducing... more
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11/01/23

Calculate the pH of a solution containing 0.0360M glutaric acid and 0.020M potassium hydrogen glutrate.

The Ka values for glutaric acid are 4.52*10^-5 and 3.78*10^-6
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04/16/23

Consider the following reaction at 298 K. 4Al(s)+3O2(g)⟶2Al2O3(s)Δ𝐻∘=−3351.4 kJ
Δ𝑆sys=Δ𝑆surr=Δ𝑆univ=
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03/28/23

Calorimetry.....
Calculate the internal energy (in Joules) of an endothermic system that absorbs 356.3 J and expands from 1.00 to 6.830 L against a pressure of 5.48 atm.
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03/27/23

How much heat energy is needed to heat 200.0 g of water from 10.0 degrees C to 50.0 degrees C, with 4.184 J/g degreesC
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03/27/23

finding the concentration
A 10.0 mL sample of HCl is titrated with 0.105 M NaOH. The initial buret volume is 0.10 mL and the final buret volume is 20.38 mL. What is the concentration (mol/L) of the HCl sample? Answer to 3... more
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03/17/23

Calculate either [H3O+] or [OH−] for each of the solutions at 25 °C.
Solution A: [OH^−] =2.97×10^−7 M; [H3O^+] = MSolution B: [H3O^+] =8.37×10^−9 M; [OH−] = MSolution C: [H3O^+] =7.51×10^−4 M; [OH−] = M
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02/19/23

Explain the significance of the black bands that are found in the emission spectra
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02/19/23

Can you tell which out of hydrogen, white light or fluorescent light has the greatest number of electron transitions (ie: quantum leaps) based on their emission spectra? Explain why or why not!

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02/08/23

Calculate the change in the freezing point (Tr) of 22.56 mol of sodium fluoride (NaF) dissolved in 5.12 kg of water. The molal freezing point depression constant of water is 1.86°C/m.
When solid sodium fluoride is dissolved in water, it completely dissociates into sodium ions and fluoride ions. Calculate the change in the freezing point (Tr) of 22.56 mol of sodium fluoride (NaF)... more
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02/07/23

Chemistry redox reaction
Calculate the E^o cell  for the redox reaction shown below in volts:2Li(s)+Mg+2(aq)→2Li+1(aq)+Mg(s)2Eocell=Eocathode+Eoanode
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02/07/23

For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O, how many grams of magnesium nitrate are produced from 3 grams of nitric acid, HNO3 ?
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O, how many grams of magnesium nitrate are produced from 3 grams of nitric acid, HNO3 ?Round your answer to the nearest tenth. Do not round your... more
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01/25/23

What will separate first at the cathode and what at the anode during molten electrolysis a mixture of NaCl and CaBr2.
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01/19/23

Calculate the pH of a 1.7 M solution of KCl.
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12/15/22

Chemistry Homework
Complete or write the following nuclear equations10n + 23392U ⟶       + 42He + 310nDecay of 2411NaAlpha decay of Nihonium-286Positron emission of potassium-40
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12/07/22

2KClO3⟶2KCl+3O2 If this reaction produced 27.3 g KCl, how many grams of O2 were produced?
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12/01/22

An equilibrium mixture contains 0.350 mol of each of the products (carbon dioxide and hydrogen gas) and 0.200 mol of each of the reactants (carbon monoxide and water vapor) in a 1.00 L container.
CO(g)+H2O(g)↽−−⇀CO2(g)+H2(g)How many moles of carbon dioxide would have to be added at constant temperature and volume to increase the amount of carbon monoxide to 0.300 mol once equilibrium has... more
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11/27/22

The balances in a well-equipped chemistry lab usually measure out to + or - 0.1 mg. How many kJ of energy could you make if you converted 0.1 mg of matter entirely to energy?
The balances in a well-equipped chemistry lab usually measure out to + or - 0.1 mg. How many kJ of energy could you make if you converted 0.1 mg of matter entirely to energy?
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11/14/22

Step 1: How many moles of NaOH are present in 27.5 mL of 0.180 M NaOH? moles of NaOH:
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04/04/15

Is the following question clearly and completely worded?
50.0 mL of 0.100 M HCl was added to a buffer consisting of 0.025 moles of sodium acetate and 0.030 moles of acetic acid. What is the pH of the buffer after the addition of the acid? Ka of acetic... more
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11/12/14

You carry out the titration of 35.00 mL of 0.1750 M pyridine using a 0.275 M HCl solution. Pyridine has a pKb = 8.77
You carry out the titration of 35.00 mL of 0.1750 M pyridine using a 0.275 M HCl solution. Pyridine has a pKb = 8.77 pH For: 0 mL 5.0 mL 1/2 Equivalence point 17.0 mL 21.0 mL Equivalence Point 26.0... more
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03/31/14

ap chem acid and base
Using data from this table of dissociation constants for acids, calculate [OH- ] and pH for each of the following solutions. (Kw = 1.0 10-14.)   A mixture that is 0.050 M in CH3COONa and 0.044 M... more
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02/07/14

Help with a metal sulfide molar solubility question! :)
Calculate the molar solubility of a hypothetical metal sulfide, MS, in a solution saturated with H2S at 25C. The pH of the solution is 3.44. Kspa for MS is 1.7 x 10-3.   I know that I need to use... more
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