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Vikentia [17]
3 years ago
14

21. _____ Which of the following entities has the greatest mass?

Chemistry
1 answer:
IrinaK [193]3 years ago
8 0
I believe it’s D because phosphorus has the mass of 30.9.
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The density of ethanol is 0.789 g/cm^3 at 20 degrees C. What volume of ethanol has a mass of 15.5 grams?
lys-0071 [83]
<span>density = mass / volume
   
given the quotient , we have density and mass, volume can be easily calculated as:
   
volume = mass / p =15.5 g / 0.789 g/cm^3
   
=~ 20 cm^3 (dimension ally constant)</span>
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3 years ago
A standard 10.00 g mass is weighed on an analytical balance 100 times. The average and standard deviation obtained gives 10.12 ±
Mekhanik [1.2K]

Answer:

There was an improvement in accuracy. There was no change in precision.

Explanation:

<em>The average mass after recalibration is closer to the mass of the standard, </em>so the recalibration improved the accuracy<em> </em>(the measurement is closer to an accepted 'true' value).

The standard deviation did not change, so the precision (or how disperse the measurements are) was not affected.

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3 years ago
What is meant by the octet rule? What electrons are involved? How does this affect how elements bond?
FromTheMoon [43]

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The octet rule is a chemical rule of thumb that reflects the observation that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas

Explanation:

4 0
2 years ago
It takes a slug 20 minutes to travel from the grass to the trash can, a trip of 15 meters. How far could the slug travel in 60 m
ruslelena [56]

Answer:

45 meters

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If it takes the slug 20 minutes to travel 15 meters, you multiply the 15 by three to get the distance for 60 minutes.

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3 years ago
Formation of water: 2H2 + 1 O2 --&gt; 2H20
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n=15 moles H2O

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2 years ago
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