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3 years ago

Multiple Choice Atoms of isotopes can be distinguished from atoms of different

Chemistry

2 answers:

Pani-rosa [81]3 years ago

8 0

The correct answer is option A.

Atoms of isotopes can be distinguished from atoms of different elements because isotopes always have the same number of protons as all other atoms of that same element.

Isotopes of different atoms of the same element have the same number of protons and electrons, but different numbers of neutrons.

Different isotopes of the same element have the same atomic number (as the number of protons are same) but different atomic masses (as the number of neutrons are different and atomic mass is the summation of the number of protons and the number of neutrons).

irinina [24]3 years ago

7 0

Protons as all other atoms of the same element

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Calculate the standard cell potential of the following cell at 25°C. Sn(s) | Sn2+(aq) || Cu2+(aq) | Cu(s).

Semmy [17]

Answer:

0.48 V

Explanation:

Usually in the cell notation, the left side shows oxidation. So,

Oxidation half reaction:

$Sn_{(s)}\rightarrow Sn^{2+}_{(aq)}+2e^-$ $E^o_{ox}=-E^o_{red}=-(-0.14\ V)=0.14\ V$

Reduction half reaction:

$Cu^{2+}_{(aq)}+2e^-\rightarrow Cu_{(s)}$ $E^o_{red}=0.34\ V$

$E^o_{cell}=E^o_{ox}+E^o_{red}= (0.14+0.34)\ V=0.48\ V$

4 0

3 years ago

Draw the major organic product for the reaction of 1-phenylpropan-1-one with the provided phosphonium ylide.

prohojiy [21]

Answer:

2-methylene propylbenzene

Explanation:

The Wittig Reaction is a reaction that converts aldehydes and ketones into alkenes through reaction with a phosphorus ylide.

The ketone in this case is 1-phenylpropan-1-one. The provided phosphonium ylide is shown in the image attached. The reaction involves;

i) alkylation

ii) addition

The product of the major organic product of the reaction is 2-methylene propylbenzene.

4 0

3 years ago

How does a allergy develop?<br><br><br> PLEASE HELP!

Nikolay [14]

Allergies arise when a foreign material such as pollen, bee venom or pet dander responds to your immune system or a food that in most people does not cause a reaction. Substances known as antibodies are formed by your immune system.

4 0

3 years ago

Read 2 more answers

Which of the following is chemically inert ( unreactive)?

IrinaK [193]

Explanation:

The atom that is chemically inert is Neon with an atomic number of 10.

An atom is chemically inert if it does not willingly take part in chemical reaction.

Atoms takes part in chemical reactions in order to attain a stable configuration as seen in the noble gases.

In the noble gases every enable level is completely filled with the appropriate number of electrons.

The noble gases are He, Ne, Ar, Kr, Xe
These elements do not react with others.
From the given option, Neon is a noble gas and therefore inert.

learn more:

Noble gas brainly.com/question/1781595

#learnwithBrainly

4 0

4 years ago

What is 30-9x2*2-21-4+4

IgorC [24]

Answer:
9 (1-2x²)

Explanation:
The given expression is:
30 - 9x²*2 - 21 - 4 + 4
The first step is to compute the multiplication. This will give:
30 - 18x² - 21 - 4 + 4
Then, we will add like terms as follows:
(30-21-4+4) - 18x²
= 9 - 18x²
Finally, we can take the 9 as a common factor from both terms, this will give:
9 (1-2x²)

Hope this helps :)

5 0

4 years ago