Answer:
66.57%
Explanation:
The decomposition reaction of calcium carbonate is shown below as:
Calculation of moles of 
:
Amount = 3.32 g
Molar mass of = 100 g/mol
The formula for the calculation of moles is shown below:
Thus, moles are:
According to reaction,
0.0332 moles of decomposes to yield 0.0332 moles of 
Theoretical yield = 0.0332 moles
Calculation of moles of formed as:
Amount = 1.24 g
Molar mass of = 56 g/mol
The formula for the calculation of moles is shown below:
Thus, moles are:
Experimental yield = 0.0221 moles
Thus,
<u>Percent yield = 66.57%</u>
It would be more likely because it is considered unstable more reactive.
The law of conservation of mass is saying that matter can't me created or destroyed.
Answer : The electrons are gained and the oxidation number of chromium decreases.
Explanation :
As we know that a redox reaction is a reaction in which the oxidation and reduction takes place simultaneously.
Oxidation reaction : The reaction where a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.
Reduction reaction : The reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.
The balanced half reaction will be :
In this reaction, the oxidation number of 'Cr' changes from (+3) to (+2) that means 'Cr' gains 1 electron and it shows reduction or the oxidation number decreases.
Hence, the electrons are gained and the oxidation number of chromium decreases.
Answer:
B. Fluorine
Explanation:
Nonmetallic character increases from <em>bottom to top</em> in a Group and from <em>left to right</em> in a period (see image).
Thus, the most nonmetallic elements are at the <em>upper right corner</em> of the Periodic Table.
We ignore the noble gases, because they are quite unreactive.
So, the element that most “wants” an electron is fluorine.
