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densk [106]
3 years ago
15

Knowledge of atomic structure has evolved over time. Thomson discovered that atoms contain electrons, Rutherford discovered that

most of the mass of an atom is concentrated in its center, and Bohr discovered that electrons orbit the nucleus.
Taken together, what do these discoveries demonstrate?
A. the cumulative nature of science
B. the quantitative nature of science
C.the importance of thorough review of scientific papers
D. the importance of not publishing science until it is final
Chemistry
2 answers:
Leona [35]3 years ago
6 0

Answer:

A

Explanation:

on edge 2020

sergejj [24]3 years ago
4 0
I believe the correct response would be A. The cumulative nature of science. How experimental evidence and ideas made by many scientists have accumulated and or built up to have a more understandable and or clear view of a particular scientific topic, and or principle.
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Why is a terminal alkyne favored when sodium amide (NaNH2) is used in an elimination reaction with 2,3-dichlorohexane
mihalych1998 [28]

The question is incomplete, the complete question is;

Why is a terminal alkyne favored when sodium amide (NaNH2) is used in an elimination reaction with 2,3-dichlorohexane? product. A) The terminal alkyne is more stable than the internal alkyne and is naturally the favored B) The terminal alkyne is not favored in this reaction. C) The resonance favors the formation of the terminal rather than internal alkyne. D) The strong base deprotonates the terminal alkyne and removes it from the equilibrium.

E) The positions of the Cl atoms induce the net formation of the terminal alkyne.

Answer:

E) The positions of the Cl atoms induce the net formation of the terminal alkyne.

Explanation:

In this reaction, sterric hindrance plays a very important role. We know that sodamide is a strong base, it tends to attack at the most accessible position.

The first deprotonation yields an alkene. The strong base attacks at the terminal position again and yields the terminal alkyne. Thus the structure of the dihalide makes the terminal hydrogen atoms most accessible to the base. Hence the answer.

7 0
3 years ago
​If 250.0 mL of a 0.96 M solution of acetic acid (C 2H 4O 2) are diluted to 800.0 mL, what will be the approximate molarity of t
adoni [48]

Answer:

0.30M HOAc

Explanation:

Given 250.0ml (0.96M HOAc) => 800ml(??M HOAc)

Use the dilution equation...

(Molarity x Volume)concentrated soln = (Molarity x Volume)dilute soln

(0.96M)(250.0ml) = (Molarity diluted soln)(800ml)

Molarity diluted soln = (0.96M)(250.0ml)/(800ml) = 0.30M HOAc

7 0
3 years ago
A hydrocarbon, containing only C and H, can react with excess oxygen gas to produce carbon dioxide and water. The result of the
Tcecarenko [31]
I believe the answer you are looking for would be HC

5 0
3 years ago
Read 2 more answers
You have a sample that has a h3o+ concentration of 1.25 x 10-5 m. what would be the [oh-]?
deff fn [24]

Answer:

[OH⁻] = 8x10⁻¹⁰

Explanation:

Kw = 1x10⁻¹⁴

Kw = [H₃O⁺] . [OH⁻]

1x10⁻¹⁴ = 1.25x10⁻⁵ . [OH⁻]

1x10⁻¹⁴ / 1.25x10⁻⁵ = [OH⁻]

[OH⁻] = 8x10⁻¹⁰

7 0
3 years ago
Pls answer and btw I use BJU
Andrew [12]

Answer:

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

Isotopic notation:       Protons            Neutrons          Electrons

        ¹⁹⁷₇₉Au                  79                      118                    79

Solution:

p+n = atomic mass = 79+118 = 197

e = 79  (atomic number)               so the element with atomic number Au.

Isotopic notation:       Protons            Neutrons          Electrons

        ⁷⁹₃₅Br                    35                        44                    35

Solution:

Number of neutrons = atomic mass - number of protons=  79-35 = 44

Number of protons and electrons are equal so number of electrons are 35.

Isotopic notation:       Protons            Neutrons          Electrons

        ¹²⁷₅₃I                          53                    74                      53

Solution:

The atomic number of iodine is 53.

Number of neutrons = atomic mass - number of protons= 127-53 = 74

Number of protons and electrons are equal so number of electrons are 53.

Isotopic notation:       Protons            Neutrons          Electrons

        ⁵⁶₂₆Fe                        26                       30                    26

Solution:

The atomic number of iron is 26.

atomic mass = n+p= 26+30= 56

Number of protons and electrons are equal so number of electrons are 26.

8 0
3 years ago
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