Can you help me on number nine please

Which of the following is the correct definition of nuclear energy?

Marianna [84]

Answer:

The answer should be A:) The energy produced from the splitting of atoms.

Explanation:

3 0

4 years ago

A solid weak acid is weighed, dissolved in water and diluted to exactly 50.00 ml. 25.00 ml of the solution is taken out and is t

Artist 52 [7]

Answer:

pKa = 3.51

Explanation:

The titration of acid solution with NaOH can be illustrated as:

$AH + NaOH \to NaA + H_2O$

Given that:

Volume of acid solution $(V_1) = 25 \ mL$

Volume of NaOH $(V_2) = 18.8 \ mL$

Molarity of acid solution $(M_1) = ???$

Molarity of NaOH $(M_2) = 0.10 \ M$

For Neutralization reaction:

$M_1V_1 = M_2V_2$

Making $M_1$ the subject of the formula; we have:

$M_1 = \frac{M_2V_2}{V_1}$

$M_1 = \frac{0.10*18.8}{25}$

$M_1 =0.0752 \ M$

However; since the number of moles of NaA formed is equal to the number of moles of NaOH used : Then :

$M_2V_2 = 0.10 *18.8 = 1.88 \ mm$

Total Volume after titration = ( 25 + 18.8 ) m

= 43.8 mL

Molarity of salt (NaA ) solution = $\frac{number \ of \ moles}{Volume \ (mL)}$

= $\frac{1.88}{43.8}$

= 0.0429 M

After mixing the two solution ; the volume of half neutralize solution is = 25 mL + 43.8 mL

= 68.8 mL

Molarity of NaA before mixing $M_1 = 0.0429 \ M$

Volume $(V_1) = 43.8 \ mL$

Molarity of NaA after mixing $M_2 = ???$

Volume $(V_2 ) = 68.8 \ mL$

∴

$M_2 = \frac{M_1*V_1}{V_2} \\ \\ M_2 = \frac{0.0429*43.1}{68.8} \\ \\ M_2 = 0.0273 \ M$

Molarity of acid before mixing = 0.0725 M

Volume = 25 mL

Molarity of acid after mixing = $\frac{0.0752*25}{68.8}$

= 0.0273 M

Since this is a buffer solution ; then using Henderson Hasselbalch Equation

$pH = pKa + log \frac{[salt]}{[acid]}$

$3.51= pKa + log \frac{[0.0273]}{[0.0273]} \\ \\ 3.51= pKa + log \ 1 \\ \\ 3.51= pKa + 0 \\ \\ pKa = 3.51$

4 0

4 years ago

Who discovered electron ???

Zanzabum

It was a Cambridge UK scientist in the early part of the 20 th century who discovered the electron. His name was J J Thompson.

5 0

4 years ago

Which of the following atoms have the same number of neutrons as an atom of Aluminum-27?

o-na [289]

_Award brainliest if helped!
B. Sulfur - 30 (14Neutrons)

7 0

3 years ago

Read 2 more answers

Atmospheric pressure decreases with increasing elevation, or distance above sea level. The elevation of Old Faithful is 2,240 me

Romashka-Z-Leto [24]

hey there!:

As El Tation is located at higher altitude than Old Faithful, the atmospheric pressure would be less at Ei Tatio.

Due to low pressure, the boiling point of water will be reduced at El Tatio. Hence, at lower temperature than Old Faithful, geysers will erupt at El Tatio due to depression of boiling point at reduced atmospheric pressure.

Hope this helps!

8 0

3 years ago