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3 years ago

How has earth changed during our masses era?

Chemistry

1 answer:

ivanzaharov [21]3 years ago

3 0

Answer:

Earth and its atmosphere are continuously altered. Plate tectonics shift the continents, raise mountains and move the ocean floor while processes not fully understood alter the climate

Explanation:

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40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been ad

kirill115 [55]

Answer:

0.5 M

Explanation:

We have to start with the reaction between NaOH and CH3COOH:

$CH_3COOH~+~NaOH->CH_3COONa~+~H_2O$

We will have a 1:1 ratio between the acid and the base. The next step then would be the calculation of the moles of NaOH and his convertion to moles of CH3COOH.

$20~mL~\frac{1~L}{1000~mL} ~=~0.02~L$

$mol~=~0.1~M*0.02~L=0.02~mol~NaOH$

$0.02~mol~NaOH~\frac{1~mol~CH_3COOH}{1~mol~NaOH}=~0.02~mol~CH_3COOH$

The final step is the calculation of the concentration of the acid.

$M=\frac{0.02~mol~CH_3COOH}{0.04~L}=~0.5~M$

Due to the Ka value we can use the acetic acid as a strong acid.

6 0

3 years ago

A neutralization reaction is a _________ replacement reaction that starts with an ________ and a __________ and ends with ______

Alexeev081 [22]

Answer:

Double, acid, base, water, salt.

Explanation:

The general reaction of a neutralization is:

X(OH) + YH → H₂O + XY

If you see, the reaction is a double replacement reaction because the cation and the anion of the two reactants switch places, forming two new compounds or products.

Always, the reaction starts with an acid and a base and will produce water and a salt.

I hope it helps!

5 0

3 years ago

Is a Mercury Thermometer a pure substance or a mixture?

alisha [4.7K]

The mercury inside the thermometer is a pure substance hope this helps :)

5 0

3 years ago

All of the following statements about solutions are correct Except?

Tasya [4]

Answer:

A solution is a heterogeneous mixture

Explanation:

This statement that a solution is a heterogeneous mixture is completely and totally wrong.

A solution is a homogeneous mixture.

Homogeneous mixtures have their constituents existing in just one phase.

It is a homogeneous mixture of solutes and solvents.
In a solution, the solutes particles are distributed uniformly in the solvent.
The solute is the substance that is dissolved to make the solution.
Solutes are usually present in a small amount than the solvent.
The solvent acts as the dispersing medium which allows the solute to go into the solution.
The solute can be solid, liquid or gas.

4 0

3 years ago

What is the ph of an aqueous solution with the hydronium ion concentration : [h3o+] = 3 x 10-5 m ?

BaLLatris [955]

The concentration of hydrogen can be shown as:

[H+ ] = 3 * 10-5 M

pH can be determined as:

pH = - log [H+ ]

= - log (3 * 10-5)

= 4.53

Thus the pH of solution is 4.53

8 0

3 years ago