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ivolga24 [154]
3 years ago
9

Which of the following observations indicates that an atom has neutrons?

Chemistry
2 answers:
olganol [36]3 years ago
8 0

Answer:

The correct answer is C: A radiation consisting of uncharged particles is emitted when alpha particles strike beryllium atoms.

Explanation:

Chadwick discovered neutron while experimenting with a gold foil. A stream of alpha particles produced from a polonium source was directed at beryllium target. It was noticed that some penetrating radiations were produced. These uncharged particles were called neutrons because on the charge detector these particles showed no deflection.

Their nuclear reaction is as follow.

                             ₂He + ₄Be ----------> ₀n + ₆C

Chadwick noticed that neutrons cannot ionize gases and are highly penetrating particles.

-Dominant- [34]3 years ago
4 0

Answer: C. A radiation consisting of uncharged particles is emitted when alpha particles strike beryllium atoms.

A. Some uncharged particles are scattered by a beryllium atom when it hits a gold foil.

B. Some uncharged particles bounce back from a gold foil when it is bombarded with alpha particles.

C. A radiation consisting of uncharged particles is emitted when alpha particles strike beryllium atoms.

D. A radiation which attracts electrons is produced when a beryllium atom is bombarded with alpha particles.

Explanation:

I just took the test and the answer is C. A radiation consisting of uncharged particles is emitted when alpha particles strike beryllium atoms.

Good Luck!!

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Answer:

1,45 mL

Explanation:

The Grignard reaction is a very important organometallic chemical reaction where the Grignard reagent ( alkyl, vinyl, or aryl-magnesium halides) acts as nucleophile in order to the formation of Carbon-Carbon bonds.

In the problem, the phenylmagnesium chloride is the grignard reagent. The volume of 2.0 M phenylmagnesium chloride solution you need to add 2.9 mmol is:

2,9 mmol × \frac{1mL}{2,0mM} = <em>1,45 mL</em>

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I hope it helps!

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3 years ago
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Answer:

See attached picture.

Explanation:

Hello!

In this case, since C2H3Cl is an organic compound we need a central C-C parent chain to which the three hydrogen atoms and one chlorine atom provides the electrons to get all the octets except for H as given on the statement.

In such a way, on the attached picture you can find the required Lewis dot structure without formal charges and with all the unshared electron pairs, considering there is a double bond binding the central carbon atoms in order to compete their octets.

Best regards!

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