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NeTakaya
3 years ago
7

I have tried the answer 3.9149 and 3.914, it is incorrect

Chemistry
1 answer:
Alja [10]3 years ago
3 0

Answer:

Yea pretty much it's 3.49

Explanation:

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What happens to the rate of a reaction as the reaction progresses?
ZanzabumX [31]

Answer:

D. The rate decreases as reactants are used up.

Explanation:

Initially, the rate increases until the reaction is at equilibrium. At equilibrium, the rate is constant.

As the reaction progresses, the rate decreases to zero when reactants are used up ( for irriversible reactions only )

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3 years ago
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Which of the following is a chemical change on alcohol?
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Boiling I think! hope you get it right
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Physical Meaning of pKa Which of the following aqueous solutions has the lowest pH: 0.1 M HCl; 0.1 M acetic acid (pKa = 4.86); 0
ser-zykov [4K]

Answer:

<em>The solution with the lowest pH is 0.1 M HCl.</em>

Explanation:

Since the three solutions have the same concentration (0,1M) it is only necessary to look at the pKa of each solution.

Also, knowing that a higher pKa means a lower Ka, because pKa = -Log (Ka). Thus, a lower Ka means a lower concentration of protons with a higher pH ( pH = -Log [H+].

The HCl doesn't have a pKa because is a strong acid that dissociates completely. Therefore, this solution produces a lower pH. Looking at the pKa of acetic acid and formic acid solutions, the second with the lowest pH is the formic acid solutions and the higher pH is for the acetic acid solution.

3 0
3 years ago
Which of the following is an example of an experimental scientific investigation
sleet_krkn [62]

Scientific investigation is the process in which scientist solve the problems by using different systematic approach. It can be initiated in different ways.

Experimental Scientific investigation: The investigation in which scientist answer the question on the basis of experimental results. Experimental investigation contains both dependent and independent variables, and only one variable is tested at a time is possible. This process makes uses of collecting observation and identifying the process in physical word.

Noting the colour of a solution when heated is the experimental scientific investigation

Therefore, other given options are part of scientific observation whereas Noting the colour of a solution when heated explains the experimental scientific investigation.



7 0
3 years ago
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What is the ph of 0.09m solution of HBr​
fomenos

Answer: 1.05

Explanation:

On ionization, hydrobromic acid completely dissociates into hydrogen ion and bromine ion. The equation is stated below

HBr <--> H+ + Br-

Recall that pH = - log(H+)

Concentration of hydrogen ion (H+) = 0.09M

So, pH = - log (0.09)

pH = - (-1.05)

pH = 1.05

The pH of 0.09M solution of HBr is 1.05. Thus, it is highly acidic.

6 0
3 years ago
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