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Liula [17]
4 years ago
11

I need help with #129 please

Chemistry
1 answer:
Veronika [31]4 years ago
8 0
The yield is 73%. If there is anything that isn’t clear, just send me a message.

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What is the most important structural feature of the water molecule
artcher [175]

Answer:

Summary. Water molecules are polar, so they form hydrogen bonds. This gives water unique properties, such as a relatively high boiling point, high specific heat, cohesion, adhesion and density.

Explanation:

7 0
3 years ago
Read 2 more answers
Consider two acids: (ch3)3cco2h (pivalic acid, pka = 5.0) and hco2h (formic acid, pka = 3.8). Which acid is the stronger acid? S
Phoenix [80]
<h3>Answer:</h3>

            Formic acid is the stronger acid.

<h3>Explanation:</h3>

                   The strength of an acid is determined by the power of it to dissociate and produce H⁺ ions. Greater the dissociation of an acid, the stronger that acid is. Also, extent of dissociation for particular acid is given by its dissociation constant i.e. Ka.

The greater the Ka value, the stronger an acid is and vice versa.

Calculating Ka value of Pivalic acid:

As,

                                                 pKa  =  -log [Ka]

So,

                                                 Ka  =  10^-pKa

Putting value of pKa,

                                                 Ka  =  10⁻⁵

                                                Ka  =  1.0 × 10⁻⁵

Calculating Ka value of Formic acid:

As,

                                                 pKa  =  -log [Ka]

So,

                                                 Ka  =  10^-pKa

Putting value of pKa,

                                                 Ka  =  10⁻³'⁸

                                                 Ka  =  1.58 × 10⁻⁴

<h3>Conclusion:</h3>

                  As the Ka value of Formic acid is greater than Pivalic acid therefore, it is stronger acid than Pivalic acid.

<h2>TIP:</h2>

     When comparing strength of acids, the acid with the lowest pKa value is considered the strongest acid and <em>vice versa</em>.

8 0
3 years ago
What is the name of the product isotope formed when Thorium-234 decays by beta decay?
defon

Answer:

protactinium-234,

Explanation:

This is what happens when thorium-234 releases a W- boson, which then decays to an electron and an electron antineutrino.

7 0
3 years ago
Why are fingertips wet with saliva before counting money?​
poizon [28]

Answer:

It helps to get a better grip on the money.

Explanation:

8 0
3 years ago
Why does the standard model of the universe need to be change?
Lorico [155]

Explanation:

The standard model of particle physics is a relativistic theory of quantum fields developed between 1970 and 1973 [citation needed] based on the ideas of unification and symmetries [1] that describes the fundamental structure of matter and vacuum considering the elementary particles as irreducible entities whose kinematics is governed by the four known fundamental interactions (except for gravity, whose main theory, general relativity, does not fit the mathematical models of the quantum world). The word "model" in the name comes from the 1970s when there was not enough experimental evidence to confirm the model. [1] To date, almost all experimental tests of the three forces described by the standard model are in agreement. with their predictions. However, the standard model falls short of being a complete theory of fundamental interactions due to several unresolved issues.

8 0
3 years ago
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