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Juli2301 [7.4K]
3 years ago
10

"what is the probability of finding an electron within one bohr radius of the nucleus"

Chemistry
1 answer:
Katena32 [7]3 years ago
6 0
Your answer is going to be b
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carbon

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PLEASE HELP ASAP! What part of the atom determines physical properties? A. Neutron B. Proton C. Nucleus D. Electron
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Question 15 Measurements show that the energy of a mixture of gaseous reactants decreases by during a certain chemical reaction,
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How can you distinguish between a solution, colloid, and suspension?
RSB [31]

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solution is clear solution while colloidal is between the solution and suspension. And in suspension particles are suspended.

Explanation:

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3 0
3 years ago
A 100.0 ml sample of 0.10 m ca(oh)2 is titrated with 0.10 m hbr. determine the ph of the solution after the addition of 400.0 ml
WINSTONCH [101]
The balanced equation for the reaction is as follows;
Ca(OH)₂ + 2HBr --> CaBr₂ + 2H₂O
stoichiometry of Ca(OH)₂ to HBr is 1:2
number of Ca(OH)₂ moles reacted - 0.10 mol/L x 0.1000 L = 0.010 mol
Number of HBr moles added - 0.10 mol/L x 0.4000 = 0.040 mol 
1 mol of Ca(OH)₂ needs 2 mol of HBr for neutralisation
therefore 0.010 mol of Ca(OH)₂  needs - 0.010 x 2 = 0.020 mol of HBr to be neutralised
but 0.040 mol of HBr has been added therefore number of moles of HBr in excess - 0.040 - 0.020 = 0.020 mol 
then pH of the medium can be calculated using the excess H⁺ ions
HBr is a strong acid therefore complete ionization
[HBr] = [H⁺]
[H⁺] = 0.020 mol / (100.0 + 400.0 mL)
      = 0.020 mol / 0.5 L 
      = 0.040 mol/L
pH = -log[H⁺] 
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pH = 1.40
pH of the medium is 1.40
8 0
3 years ago
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