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Escribe aquí algo que consideres que requiere un balance para que se lleve a cabo correctamente:

Galina-37 [17]

Answer:

Direct weighing means that an object is placed directly on a balance and the mass read. Weighing directly requires that the balance be carefully zeroed (reads zero with nothing on the balance pan) in order to obtain accurate results.

Explanation:

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3 0

3 years ago

Neutral atoms of argon, atomic number 18, have the same number of electrons as each of the following items except: Cl- S -2 K+ C

irinina [24]

Answer:

Ne.

Explanation:

Neutral argon, atomic number 18, has 18 electrons.

Cl⁻:

Neutral atom of Cl, atomic number 17, has 17 electrons.

When it gains electron and be Cl⁻, then it has 18 electrons a neutral Ar.

S²⁻:

Neutral atom of S, atomic number 16, has 16 electrons.

When it gains 2 electrons and be S²⁻, then it has 18 electrons a neutral Ar.

K⁺:

Neutral atom of K, atomic number 19, has 19 electrons.

When it losses electron and be K⁺, then it has 18 electrons a neutral Ar.

Neutral atom of Ca, atomic number 20, has 20 electrons.

When it losses 2 electrons and be Ca²⁺, then it has 18 electrons a neutral Ar.

Ne:

It is a noble gas that has 10 electrons.

<em>So, the right choice is: Ne.</em>

3 0

3 years ago

If a solution has a [H+] of 9.3x10-11, what is the pH?

Rina8888 [55]

Answer:

Explanation:

The pH of a solution can be found by using the formula

$pH = - log [ {H}^{+} ]$

From the question we have

$ph = - log(9.3 \times {10}^{ - 11} ) \\ = 10.0315...$

We have the final answer as

Hope this helps you

4 0

3 years ago

What is the measurement 1042 L rounded off to two signicant digits ?

SOVA2 [1]

This is a really hard question. Because if you change it to 1,000 then that's only one. If you add the decimal so it's 1,000. , then that's 4 if you change it to 1,040, that's 3. So you can not change that to 2 significant digits.

5 0

3 years ago

Many carboxylic acids are much better known by their common names than by their systematic names. 2-Hydroxypropanoic acid (bette

sdas [7]

Answer:

CH₃ - CH - COOH

|

OH

The developed structural formula is also attached.

Explanation:

The IUPAC name, <em>2-hydroxypropanoic acid</em>, lets you predict the structural formula for <em>lactic acid</em>.

<em>2-hydroxy</em> means that there is a OH functional group attached to the second carbon atom of the chain.

<em>Propan</em> prefix means that the molecule has 3 carbon atoms.

<em>oic</em> suffix means that it is a carboxylic acid, this is it contains the COOH functional group.

Hence, in conclusion the structural form of lactic acid is:

C³H₃ - C²H - C¹OOH

|

OH

I used the superscripts just to show the number of the carbon atom in the chain.

The formal structural formula does not contain such superscripts it is just:

CH₃ - CH - COOH

|

OH

A more developed structural formula will show the distribution of the atoms in the space. I have also attached a picture with the developes structural formula.

3 0

3 years ago

Pls Help!!!!! ASAP!!!!​

Pls Help!!!!! ASAP!!!!