How many valence electrons does carbon have
2 answers:
Answer:
Carbon has 4 valence electrons
Explanation:
The valence electrons are those found in the last energy level of the atom.
They are responsible for the interaction between atoms,
they can form bonds.
Let's see the <em>electronic configuration</em> of carbon.
The atomic number of C is 6 (Z=6)
To know the number of valence electrons that we have we count in the last energy level of the atom.
The last energy level of carbon is 2 and we 4 electrons is this level.
So carbon has 4 valence electrons.
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Answer:
pH of the solution will slightly increase as it becomes less acidic for which it turns out to be more diluted.
Explanation:
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In this case, according to the given information, it turns out possible for us to calculate the pH change of the solution by firstly calculating the HCl concentration, as equal to that of the hydrogen ions whose pH is 2 as this is a strong acid:
Now, since water is added to the solution, but we do not have the initial volume of this solution, we can ensure that its pH will increase, become less acidic, because the concentration of the acid, and consequently that of the hydrogen ions, is diminished as the volume is increased.
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Answer: is considered as the limiting reagent for this reaction.
Explanation:
Limiting reagent is the reagent which limits the formation of the product.
Excess reagent is the reagent which is present in excess in a chemical reaction.
For the combustion of acetylene, the reaction follows:
By Stoichiometry,
5 moles of oxygen gas reacts with 2 moles of acetylene.
So, 81 moles of oxygen gas will react with = = 32.4 moles of acetylene.
As, the required amount of acetylene is less than the given amount. So, it is considered as an excess reagent and oxygen gas is the limiting reagent.