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3 years ago

As a consequence of the discovery of the nucleus by rutherford, which model of the atom is thought to be true?

Chemistry

2 answers:

ivanzaharov [21]3 years ago

8 0

The correct answer is A.

8090 [49]3 years ago

7 0

Answer:

The correct answer is a. electrons are distributed around the nucleus and occupy almost all the volume of the atom.

Explanation:

Rutherford's experiment was to bombard a very thin sheet of gold (Au atoms) with alpha particles (positive charges). He thought that if the atom is composed by both negative and positive charges together (as Thompson had proposed) it would be electrically neutral and the positive charges would pass without deviation. He observed that most of the particles passed throught the sheet without deviation (as he expected) but several particles suffered a considerable deviation and others had bounced towards the emission source. So, he proposed a new atomic model in which the positive charge is concentred in the nucleus (alpha particles which passed nearly the nucleus were repelled with a considerable deviation) and surrounding the nucleus are the electrons (negative charge) which occupy a larger volume.

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Radon (Rn) is the heaviest, and only radioactive, member of Group 8A(18) (noble gases). It is a product of the disintegration of

Serggg [28]

Given data Atomic mass of Ra= 226g/mol

no. of moles =1.0/226g/mol =0.04424moles

no. of atoms in 0.044moles

no. of atoms =no. of moles x avogadro's number

= 0.044x 6.022 x10^23 = 0.264968 x 10^22

If 10^15 atoms of Ra produce 1,373*10^4 atoms of Rn per second then 2,66 *10^21 forms 3,658*10^10 atoms of Rn per second.

Day has 246060=86400 s

That means that 2,66x10^21 atoms of Ra produces 3,16 x10^15 atoms of Rn in a day.

N(Rn)=3.16* 10 ^15 n(Rn)=N/NA

n(Rn)=5,25*10−9 pV=nR*T

T=273.15K R=8,314

p=101325Pa V=n∗R∗T/p

V=5.25∗10^−9 ∗ 8.314 ∗ 273.15 / 101325

V=1.1810^−10 m^3 = 118 x10^-7 liters of Rn, measured at STP, are produced per day by 1.0 g of Ra

To know more about Ra here

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2 years ago

In a molecule of water, how many electrons are shared between each hydrogen atom and an oxygen atom? A. One B. Two C. Four

lesya692 [45]

The answer is Two (B).

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3 years ago

Read 2 more answers

Meanings of Ka and pKa (a) Does a strong acid have a greater or lesser tendency to lose its proton than a weak acid? (b) Does th

Sunny_sXe [5.5K]

Answer:

(a) A strong acid has a greater tendency to lose its protons.

(b) A strong acid has a higher Ka than a weak acid.

Explanation:

A strong acid has the ability to completely transfer their protons to the water, making a complete dissociation. Instead, a weak acid only dissociates partially, how much it dissociates depends on the acid dissociation constant (Ka).

The weak acids always are in equilibrium, and the equilibrium depends on the acid dissociation constant.

$HA + H_{2}O$ ⇄ $A^{-} + H_{3}O^{+}$

Thus, a stronger acid with a bigger Ka produces more dissociation and a higher concentration of protons.

The equation that defines pKa is:

$pKa = -Log (Ka)$

Therefore, a higher pKa means a lower Ka and also a weaker acid.

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3 years ago

How does the scientific method help scientists?

Gwar [14]

When conducting research, scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis (often in the form of an if/then statement), the results aiming to support or contradict a theory.

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3 years ago

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The ________ law of thermodynamics states the energy is conserved in chemical processes.

Elden [556K]

First Law

The law of conservation of energy states that the total energy of an isolated system is constant

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3 years ago