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kondaur [170]
3 years ago
12

What happens during all chemical changes?

Chemistry
2 answers:
3241004551 [841]3 years ago
7 0

Answer: Option (B) is the correct answer.

Explanation:

A change which brings change in composition of atoms of a substance to result in the formation of new substances is known as a chemical change.

Therefore, in a chemical change new substances are formed which have different properties as compared to their reactants.

For example, 2Na + Cl_{2} \rightarrow 2NaCl

Thus, we can conclude that during all chemical changes atoms rearrange to form new substances.

Marina86 [1]3 years ago
5 0

Answer:

Atoms rearrange to form new substances

Explanation:

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The pH of a 0.15 M butylamine, C&H3NH2 solution is 12.0 at 25°C. Calculate the dissociation
Dmitrij [34]

The dissociation  constant of the base : 7.4 x 10⁻⁴

<h3>Further explanation</h3>

Butylamine, C4H9NH2 Is A Weak Base

Kb is the dissociation  constant of the base.​

LOH (aq) ---> L⁺ (aq) + OH⁻ (aq)  

\rm Kb=\dfrac{[L][OH^-]}{[LOH]}

[OH⁻] for weak base can be formulated :

\tt [OH^-]=\sqrt{Kb.M}

pH of solution : 12

pH+pOH=14, so pOH :

14-12 = 2, then :

\tt [OH^-]=10^{-pOH}\\\\(OH^-]=10^{-2}

the the dissociation  constant (Kb) =

\tt 10^{-2}=\sqrt{Kb.0.15}\\\\10^{-4}=Kb\times 0.15\\\\Kb=\dfrac{10^{-4}}{0.15}=6.6\times 10^{-4}

Or you can use from ICE method :

C4H9NH2(aq) + H2O(l) ⇌ C4H9NH3+(aq) + OH-(aq)

0.15

x                                                x                        x

0.15-x                                        x                        x

\tt Kb=\dfrac{x^2}{0.15-x}\rightarrow x=[OH^-]\\\\Kb=\dfrac{10^{-4}}{0.15-10^{-2}}=7.14\times 10^{-4}

6 0
3 years ago
What would be the final volume (in mL) of the aqueous potassium fluoride which was prepared by dissolving 8.0 g of potassium flu
zhuklara [117]

Answer:

0.15 L

Explanation:

Step 1. Calculate the <em>moles of KF.</em>

Molar mass = 58.10 g/mol

Moles of KF = 8.0 × 1/58.10  

Moles of KF = 0.138 mol KF

===============

Step 2. Calculate the <em>volume of KF </em>

c = n/V                  Multiply both sides by V

V = 0.138 × 1/0.89  

V = 0.15 L



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Answer:sugar

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