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Daniel [21]
3 years ago
11

Which element is a noble gas? (1) krypton (3) antimony (2) chlorine (4) manganese

Chemistry
2 answers:
Leno4ka [110]3 years ago
8 0

Answer:

Krypton

Explanation:

Maksim231197 [3]3 years ago
5 0
The element from those four that is a noble gas is krypton. 
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Newtons second law in your own words.
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behavior of objects for which all existing forces are not balanced.

Explanation:

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Answer:

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2.Which of the alcohols listed below would you expect to react most rapidly with PBr3?A)CH3CH2CH2CH2CH2CH2OHB)(CH3CH2)2CH(OH)CH2
Gnoma [55]

Answer:

A) CH3CH2CH2CH2CH2CH2OH

Explanation:

For this question, we have the following answer options:

A) CH3CH2CH2CH2CH2CH2OH

B) (CH3CH2)2CH(OH)CH2CH3

C) (CH3CH2)2CHOHCH3

D) (CH3CH2)3COH

E) (CH3CH2)2C(CH3)OH

We have to remember the<u> reaction mechanism</u> of the substitution reaction with PBr_3. <em>The idea is to generate a better leaving group in order to add a "Br" atom.</em>

The PBr_3 attacks the "OH" generation new a bond to P (O-P bonds are very strong), due to this new bond we will have a better leaving group that can remove the oxygen an allow the attack of the Br atom to generating a new C-Br bond. This is made by an <u>Sn2 reaction</u>. Therefore we will have a faster reaction with <u>primary substrates</u>. In this case, the only primary substrate is molecule A. So, <em>"CH3CH2CH2CH2CH2CH2OH"</em> will react faster.

See figure 1

I hope it helps!

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3 years ago
Calculate a pendulums frequency (in Hz) if the pendulum completes 19 cyclesin 0.5 s.
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1Hz = 1 cycle per second

19 cycles / .5 seconds = 38Hz
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How many unshared electron pairs are present in KrF2
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