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Yanka [14]
3 years ago
15

The calorimeter pictured below shows the final temperature after calcium chloride was added to water. (The initial temperature w

as 25°C.) Which of the following best describes what occurred within the calorimeter?
A. Only Bond forming occurred

B. The bonds that formed were the most part stronger than the bonds that were broken

C. More energy was absorbed in breaking bonds than was released when new bonds form

D. As the powder dissolved, the breaking of bonds released energy
Chemistry
2 answers:
creativ13 [48]3 years ago
7 0

Answer:

The answer is acctualy B

Explanation:

I did the gizmo

max2010maxim [7]3 years ago
3 0
It’s probably D or c
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A solution of hydrochloric acid of unknown concentration was titrated with 0.10 M NaOH. If a 100.-mL sample of the HCl solution
madam [21]

<u>Answer:</u> The initial pH of the HCl solution is 3

<u>Explanation:</u>

To calculate the concentration of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is HCl

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is NaOH.

We are given:

n_1=1\\M_1=?M\\V_1=100mL\\n_2=1\\M_2=0.10M\\V_2=1mL

Putting values in above equation, we get:

1\times M_1\times 100=1\times 0.10\times 1\\\\M_1=\frac{1\times 0.10\times 1}{1\times 100}=10M

1 mole of HCl produces 1 mole of H^+ ions and 1 mole of Cl^- ions

To calculate the pH of the solution, we use the equation:

pH=-\log[H^+]

We are given:

[H^+]=0.001M

Putting values in above equation, we get:

pH=-\log (0.001)\\\\pH=3

Hence, the initial pH of the HCl solution is 3

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