Which of these species is an aromatic compound?

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Which of these species is an aromatic compound?

A.C2H2
B.C5H10
C.C6H4Br2
D.C6H12

 
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When you consider lanthanides and actinides,

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When you consider lanthanides and actinides, they have these kinds of orbitals:

A.s only
B.f only
C.s, p and d
D.s, p, d, and f

 
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What is effective nuclear charge?

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What is effective nuclear charge? How does it affect the size of an element’s atomic radius? (YOUR ANSWER MUST BE COMPLETE AND THOROUGH TO RECEIVE FULL CREDIT)

 
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Part 1) Suppose I have 5.600 g of solid CO22

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Part 1) Suppose I have 5.600 g of solid CO22
in an empty sealed 4.00 L container at a temperature of 300 K. When all the solid CO becomes gas, what will be the pressure in the container?

Part 2) Temperature is not the only way to convert inorganic carbon to gaseous CO2. Suppose we have Na2CO3 and add sulfuric acid. Can you write a balanced equation that results in the production of gaseous CO2? What kind of reaction is this?

 
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