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Vesna [10]
3 years ago
5

What it is the total length of two pieces of rubber tubing which are 7.69 cm and 4.028 cm in length? Express this answer to the

correct number of significant figures
Chemistry
1 answer:
Brilliant_brown [7]3 years ago
6 0
The corrects answer it 9. 45
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Boris is interested in conducting his first "real" scientific research. However, he is a bit overwhelmed with all of the possibl
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Which of the following statements about the kinetic molecular theory are not correct?
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Answer:

The false statement is: (C) The average kinetic energy of the molecules is not related to the absolute temperature

Explanation:

According to the Kinetic Theory of Gases, gases are composed of <u>small fast moving particles that are in constant random motion</u>. These gaseous particles are known as molecules.

It is assumed that the mass of all the gaseous molecules is the same and the <u><em>intermolecular interactions (attractive or repulsive) are negligible</em></u>.

Also, the <em><u>total volume of all the gaseous molecules is considered to be negligible as compared to the volume of the container.</u></em>

According to this theory, <em><u>average kinetic energy (K) of the gaseous particles is directly proportional to the absolute temperature (T) of the gas, </u></em>by the equation:

K = \frac{3}{2}k_{b}T

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What is the ph of a solution containing 0.12mol/l of nh4cl and 0.03 mol/l of naoh (pka is 9.25)?
Alborosie
Given the following:

Concentration of residual (NH4)+  = 0.12 - 0.03 = 0.09 mol / L 
Concentration of created NH3       = 0.03 mol / L 

The (NH4) + reacts with all (OH)- to form NH3 and H2O ( Water ) 

The resultant solution is NH4+ / NH3 buffer system in which (NH4)+ is acid  and the NH3 is base or as called the salt.

For a buffer system : 

pH    = pKa + Log (acid) / (salt)         
          = 9.25 + Log [ (NH4)+ ] / [ NH3 ]         
          = 9.25 + Log [ 0.09 ] / [ 0.03 ]         
          = 9.25 + Log 3         
          = 9.25 + 0.4771         
pH    = 9.7271 or 9.73 which is rounded up to 2 decimal places
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