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3 years ago

What are valence electrons?

1 answer:

5 0

In chemistry and physics, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

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Given the following data in the Determination of Molar Mass of CO2 lab : Mass (before rxn): test tube HCl(aq) stir bar capsule 2

RSB [31]

Answer:

.259 g

Explanation:

PV = nRT

n = PV / RT

= .986 x 0.144 / .082 x 293.6

= .005897 moles

= .005897 x 44 g

= .259 g

3 0

2 years ago

Moseley discovered that elements with similar properties occurred at regular intervals when the elements were arranged in order

ziro4ka [17]

Moseley discovered that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing

" Atomic number "

4 0

2 years ago

A sample of sulfuryl fluoride, SO2F2, has a mass of 19.2 g. What amount, in moles, does this mass represent?

snow_tiger [21]

Answer:

0.188 moles

Explanation:

moles=mass/molar mass

moles= 19.2/ (32+32+38)

moles= 0.188

5 0

3 years ago

Read 2 more answers

Plz help and plz tell me if u need any thing else

andrew-mc [135]

Pick "A" as the answer.

4 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

The developed structural formula is also attached.

Explanation:

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

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

Propan prefix means that the molecule has 3 carbon atoms.

oic 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

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

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