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3 years ago

Please help. me with my chemistry

Chemistry

1 answer:

Dominik [7]3 years ago

8 0

You won’t help with the whole worksheet? Would that be considered plagiarism if I did it. Not exactly beucase I did it and you copy the answers. You just copy my work

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A solution of HCOOH has 0.16M HCOOH at equilibrium. The Ka for HCOOH is 1.8×10−4. What is the pH of this solution at equilibrium

kotykmax [81]

Answer:

$pH=2.28$

Explanation:

Hello,

In this case, for the acid dissociation of formic acid (HCOOH) we have:

$HCOOH(aq)\rightarrow H^+(aq)+HCOO^-(aq)$

Whose equilibrium expression is:

$Ka=\frac{[H^+][HCOO^-]}{[HCOOH]}$

That in terms of the reaction extent is:

$1.8x10^{-4}=\frac{x*x}{0.16-x}$

Thus, solving for $x$ which is also equal to the concentration of hydrogen ions we obtain:

$x=0.00528M$

$[H^+]=0.00528M$

Then, as the pH is computed as:

$pH=-log([H^+])$

The pH turns out:

$pH=-log(0.00528M)\\\\pH=2.28$

Regards.

7 0

4 years ago

Sarah is writing a paper explaining protein formation. Choose the correct way to complete each sentence.

Amanda [17]

Answer :

Amino acids join by forming (1) peptide bonds. Water is released.

The chains of amino acids vary according to their (2) side chains, which each have differing makeup.

These chains determine the protein’s structure and they fold to create a unique (3) third-dimensional shape.

Explanation :

Amino acid : The amino acids are the building blocks of protein. Amino acids are the compound which consist both amine $(-NH_2)$ and carboxylic $(-COOH)$ groups along with the side chains. In the protein, many amino acids are linked by the peptide bonds.

Th peptide bonds are formed by the combining of amino group of one amino acid to the carboxylic group of another amino acid by releasing of water.

Some examples of amino acids are glycine, lysine, alanine, etc.

Peptide bond formation image is shown below.

In the image 'R' can be contained by different groups like hydrogen, methyl, phenyl, etc

8 0

3 years ago

Which of the following are physical properties of a penny? Choose all that are correct.

malfutka [58]

Slightly red in color is the only physical property

6 0

3 years ago

What is the difference between a forklift and a hi-lo?

tatiyna

<span>The forklift is a truck used to lift and move materials HI-LO is a type of forklift.
The difference between a forklift and a Hi-Lo is that they use different steering wheel. HI-LO uses joy stick like steering wheel and forklift uses regular steering wheel.</span>

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3 years ago

Which environmental concern does not apply to wind power?

wolverine [178]

<h2>Answer:</h2>

The correct answer is option C which is chemical waste.

<h3>Explanation:</h3>

Wind is the renewable source of the energy. The air has energy in it which is used to run the generator to produce electrical energy from the mechanical energy of wind.
Wind energy is perfect in sense of pollution. It does not create any chemical waste because there is no conversion or production of chemical energy involve in this energy production.
While bats and birds death is caused by the fans used to run generators and a huge noise is also created by the wind energy production.

3 0

3 years ago