What is in between the nucleus and electrons of an atom?

Chemistry

1 answer:

Valentin [98]3 years ago

3 0

Answer:

The empty space between the atomic cloud of an atom and its nucleus is just that: empty space, or vacuum. ... Electrons are thus 'spread out' quite a bit in their orbits about the nucleus. In fact, the wave-functions for electrons in s-orbitals about a nucleus actually extend all the way down into the nucleus itself.

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**A piece of marble (assume it is pure CaCO3) reacts with 2.00L of 2.52 M HCl. After dissolution of the marble, a 10.00 mL sampl

Mariulka [41]

Answer:

3.7 g

Explanation:

In this problem, marble reacted completely with an excess of HCl, which then reacted with NaOH

The reaction between marble and HCl is:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

Then the excess HCl reacted with NaOH:

HCl + NaOH → NaCl + H₂O

So first let's calculate the amount of excess HCl that reacted with NaOH:

0.9987 M NaOH * 0.02487 L * $\frac{1molHCl}{1molNaOH}$ = 0.02483 mol HCl

Then we calculate the number of unreacted HCl moles in the original 2 L:

0.02483 mol HCl * 2 L / 0.01 L = 4.966 mol HCl

We substract that number from the initial HCl moles in order to find out how many of them reacted with the piece of marble

Initial HCl moles = 2.00 L * 2.52 M = 5.04 mol HCl

HCl moles that reacted with marble = 5.04 - 4.966 = 0.074 mol HCl

With that we can calculate the moles of marble, and finally the mass, using its molecular weight:

0.074 mol HCl * $\frac{1molCaCO_{3}}{2molHCl}$ * $\frac{100g}{1molCaCO_{3}}$ = 3.7 g marble

5 0

4 years ago

Which is the best reason for choosing the beaker for heating the solution? The beaker is the only container that can withstand h

lyudmila [28]

Answer: The beaker will not tip over when placed on the hot plate

Justification:

Since beakers have flat surface bottoms (usually and this is the condition to use them for this particular application) they can be placed safely on the hot plate without the risk that the they tip over.

Beakers are wide mouth cylindrical vessels used in laboratories to store, mix and heat liquids. Most are made of glass, in which case the glass is resistant to the flame and does not break when exposed to high temperatures or when is heated by direct contact on a hot plate.

So, their safe shape (flat bottom) that makes them stable, along with their ability to withstand high temperatures, make them suitable to heat solutions in laboratories.

6 0

4 years ago

Read 2 more answers

Name and write the structures of all isomers of the propyl and butyl alkyl groups.

sergeinik [125]

Answer:

Explanation:

Propyl and butyl groups are the alkyl groups formed by replacing the one hydrogen atom from their corresponding alkanes.

Propyl is formed from propane and has n-propyl and isopropyl alkyl isomers.

Butyl is from butane and has n-butyl, isobutyl , sec-butyl and tertiary butyl alkyl isomers.