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pshichka [43]
4 years ago
9

Which statements about exothermic and endothermic reactions are correct? (its a multiple choice question)

Chemistry
1 answer:
geniusboy [140]4 years ago
5 0

Answer:

C)1 and 3 only☺️

Explanation:

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The ka of hypochlorous acid (hclo) is 3.0 ⋅ 10−8 at 25.0 °c. calculate the ph of a 0.0375m hypochlorous acid solution.
Scrat [10]
We can set up an ICE table for the reaction:                      
                      HClO          H+     ClO-
Initial              0.0375       0        0
Change         -x               +x      +x
Equilibrium    0.0375-x     x        x

We calculate [H+] from Ka:     
     Ka = 3.0x10^-8 = [H+][ClO-]/[HClO] = (x)(x)/(0.0375-x)

Approximating that x is negligible compared to 0.0375 simplifies the equation to         
     3.0x10^-8 = (x)(x)/0.0375     
     3.0x10^-8 = x2/0.0375     
     x2 = (3.0x10^-8)(0.0375) = 1.125x10^-9     
     x = sqrt(1.125x10^-9) = 0.0000335 = 3.35x10^-5 = [H+]
in which 0.0000335 is indeed negligible compared to 0.0375.

We can now calculate pH:     
     pH = -log [H+] = - log (3.35 x 10^-5) = 4.47
6 0
4 years ago
2. Which of the following is true about a carbonated soft drink?. . The carbon dioxide is the solvent, and water is the solute..
const2013 [10]
A carbonated soft drink hs a large amount of water dissolved with ample amount of carbon dioxide. In this case, the solvent is water and carbon dioxide is the solute. In 2, for the reaction <span>CH3COOH = CH3COO + H+, CH3COOH is a Bronsted-Lowry acid because it releases a proton which is H+. </span>
3 0
3 years ago
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Cells that carry info throughout your nervous system
Rama09 [41]

Neurons are cells that carry info in the nervous system

8 0
3 years ago
How many moles of water molecules are in 57.43 g of iron (iii) chloride dihydrate
Kobotan [32]

Explanation:

im not sure all I know is 1.81 x 1024

6 0
3 years ago
Consider the reaction below.
Alborosie

Answer: HI and I^-

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

For the given chemical equation:

HI+H_2O\rightarrow H_3O^++I^-

Here, HI is loosing a proton, thus it is considered as an acid and after losing a proton, it forms I^- which is a conjugate base.

And, H_2O is gaining a proton, thus it is considered as a base and after gaining a proton, it forms H_3O^+ which is a conjugate acid.

Hence, the correct answer is D.

7 0
3 years ago
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