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Travka [436]
2 years ago
12

Which option is an example of a physical change? Question 3 options: baking bread burning paper cooking eggs cutting paper

Chemistry
1 answer:
Aleks04 [339]2 years ago
4 0

Answer:cutting paper

Explanation:

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3 years ago
Which of the following would have the largest pKa?
garri49 [273]

Answer:

CH3CH2NH3+/CH3CH2NH2 would have the largest pKa

Explanation:

To answer this question we must know Kb of CH3CH2NH2 is 5.6x10⁻⁴, and for C6H5NH2 is 4.0x10⁻¹⁰. And the CH3CH2NH3+ and C6H5NH3+ are related with these substances because are their conjugate base. That means:

pKa of  CH3CH2NH3+ =  CH3CH2NH2;  C6H5NH3+ =  C6H5NH2

Also, Kw / Kb = Ka

Thus:

pKa of CH3CH2NH3+/CH3CH2NH2 is:

Kw / kb = Ka = 1.79x10⁻¹¹

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That means CH3CH2NH3+/CH3CH2NH2 would have the largest pKa

5 0
3 years ago
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