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3 years ago

Which of the following is a noble gas? carbon dioxide, boron, oxygen, and helium

2 answers:

6 0

Helium is a nobel gas carbon dioxide is a compound boron I think is a metal oxgen is not a nobel gas I know the periodic table of elements like its the back of my hand I'm only14

sweet [91]3 years ago

4 0

Carbon dioxide is a noble gas.

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If a solution conducts electricity, it is positive evidence that solute dissolved in solvent is electrolyte.

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3 years ago

Solid NaBr is slowly added to a solution that is 0.073 M in Cu+ and 0.073 M in Ag+.Which compound will begin to precipitate firs

saul85 [17]

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AgBr should precipitate first.

The concentration of $Ag^+$ when CuBr just begins to precipitate is, $1.34\times 10^{-6}M$

Percent of $Ag^+$ remains is, 0.0018 %

Explanation :

$K_{sp}$ for CuBr is $4.2\times 10^{-8}$

$K_{sp}$ for AgBr is $7.7\times 10^{-13}$

As we know that these two salts would both dissociate in the same way. So, we can say that as the Ksp value of AgBr has a smaller than CuBr then AgBr should precipitate first.

Now we have to calculate the concentration of bromide ion.

The solubility equilibrium reaction will be:

$CuBr\rightleftharpoons Cu^++Br^-$