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Stells [14]
3 years ago
14

Please Need help asap

Chemistry
1 answer:
ruslelena [56]3 years ago
4 0

Answer:

A

Explanation:

The number of protons and neutrons of an element is the same. the electrons are the only thing that can differ.  The atomic number equal the protons and neutrons.

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Potassium hydroxide is used to precipitate each of the cations from their respective solution. determine the minimum concentrati
MAXImum [283]
This is the three cases that help to determine the minimum concentration of KOH required for precipitation 
Part a) 1.5×10^−2 M K CaCl2 
Part b) 2.3×10^−3 M Fe (NO3)2 
Part c) 2.0×10^−3 M MgBr2

a) CaCl2 + 2KOH --> Ca (OH) 2 + 2KCl Ca (OH) 2 <=> Ca^2+ + 2OH^- 
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b) Fe (NO3)2 +2 KOH--> Fe (OH)2 + 2KNO3 
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4.87*10^-17 = 2.3*10^-3 + x^2 
x= 1.46*10^-7 

c) MgBr2 + KOH --> Mg (OH) 2 + 2KBr 
Mg (OH) 2 <=> Mg^2+ + 2OH^- 
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4 years ago
Hydrogen has 2 naturally occurring isotopes hydrogen -1 and hydrogen-2. what is the symbol for each of these isotopes?
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