Rutherford's scattering experiment demonstrated Question 9 options: the existence of protons. the existence of electrons. the existence of neutrons. that most of the mass of an atom is in its nucleus. that the charge-to-mass ratio of an electron is constant.

Answers

Answer 1

He came to the conclusion that mass and positive charge are concentrated at the center of the atom from a small number of alpha particles deflected by huge angles with a 180.

Rutherford discovered that most positively charged alpha particles in his gold foil experiment passed straight through the foil without being deflected, leading him to believe that the majority of the atom's space is largely empty.

He came to the conclusion that mass and positive charge are concentrated at the center of the atom because there are few alpha particles that are deflected by huge angles with a 180. Rutherford Atomic Model - J. J. Thomson's "plum pudding" model was unable to account for some experimental findings related to the atomic structure of elements. British scientist Ernest Rutherford performed.

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Related Questions

PLEASE HELP
How many moles of silane gas (SiH4) are present in 8.68 mL
measured at 18 0C and 1.50 atm?

Answers

Answer: There are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.

Explanation:

Given: Volume = 8.68 mL (1 mL = 0.001 L) = [tex]8.68 \times 10^{-3} L[/tex],    

Temperature = [tex]18^{o}C = (18 + 273) K = 291 K[/tex],

Pressure = 1.50 atm

The ideal gas formula is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\1.50 atm \times 8.68 \times 10^{-3} L = n \times 0.0821 L atm/mol K \times 291 K\\n = \frac{1.50 atm \times 8.68 \times 10^{-3} L}{0.0821 L atm/mol K \times 291 K}\\= \frac{0.01302}{23.8911}\\= 0.00054 mol[/tex]

Thus, we can conclude that there are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.

Which of the following can result in deviations from Beer\'s law when the path length is constant? Solute concentrations less than 0.01 M Stray light reaching the detector The absorbing species undergoes dissociation or association The sample is homogeneous The use of polychromatic radiation

Answers

The option that can lead to deviations from Beer's law at constant path length is option A.

Using monochromatic radiation All radiation that was not absorbed by his sample when stray light reaches the detector is transmitted to the detector.

All of the above factors can lead to deviations from Beer's Law if the path length is constant. Optical pathlength refers to the distance that light travels through a sample and is usually kept constant in spectrophotometric experiments in order to accurately measure the sample's absorbance.

Therefore, unless monochromatic radiation is used, the absorbance of the sample may not accurately reflect the concentration of the solute, as different wavelengths of light may be absorbed differently.

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Fe(OH)3
⎯⎯→
Fe2O3
⎯⎯→
Fe
⎯⎯→
FeCl2
⎯⎯→
Fe(OH)2

Answers

Answer:

decomposition reaction

Students are challenged to design cold packs for treating injuries. To do this they must find a chemical reaction that absorbs heat energy. The ideal chemical reaction will reach a temperature in the range of 0C to 4C and maintain that temperature for a minimum of 20 minutes

Answers

Students as a chemical reaction that absorbs thermal energy for the design of cold packs for the treatment of injuries can combine manganese oxide (MnO2) with hydrogen peroxide (H2O2)

By controlling the amounts of the reactants they can control the temperature, keeping it between 0 °C and 4 °C for 20 minutes or more.

This type of chemical reaction is called endothermic, because energy is absorbed in the form of light or heat, causing the resulting products to have higher energy than the reactants.

Chemical reaction that absorbs thermal energy fpr cold compresses for the treatment of injuries

The most widely used endothermic chemical reaction in the treatment of injuries is the melting of ice, at least in warm environments, which occurs according to the following reaction:

H2O (s) + Energy ----- H2O (l)

Decomposition of manganese oxide absorbs thermal energy

The effect of an endothermic reaction is absorbs heat energy and in the case of manganese oxide the following decomposition occurs:

MnO2 (s) → MnO (s) + ½ O2 (g); ∆HR = 134kJ

Students can design cold packs for treating injuries with manganese dioxide bcause it breaks down into two products, manganese oxide and oxygen, making the enthalpy greater than zero (∆HR > 0).

MnO2 is a solid between gray and black in color and is present in minerals such as pyrolusite and nsutite, when combined with hydrogen peroxide it acts as a catalyst so that it accelerates chemical reaction

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The faster the object is moving the more portential energy it has?

Answers

Answer:

sure

Explanation:

Why do you think the author chose to organize the information this way

Answers

Can’t help without knowing the passage or book

A 46 g piece of metal at 250C is placed in a calorimeter with 500. mL of water at 20C. If the final temperature was 24C, the specific heat of the metal is what?

Answers

Explanation:
This is a thermo-equillibrium situation. We can use the equation
Loss of Heat of the Metal = Gain of Heat by the Water

Q
m
=
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Q
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Q
=
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Heat
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mass
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(
T
f

T
i
)

T
f
=
Final Temp
T
i
=
Initial Temp
C
P
=
Specific Heat
Metal
Water
m
=
17.5
g

T
f
=
30.0
o
C

T
i
=
125.0
o
C

C
P
=
x
Water
m
=
15.0
g

T
f
=
30.0
o
C

T
i
=
25.0
o
C

C
P
=
4.184
J
g
o
C
#

Q
m
=
+
Q
w


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m
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T
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T

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17.5
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4.184
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How many ATP are directly generated in the Krebs cycle when 2 molecules of glucose are oxidized?

Answers

4 ATP molecules are directly generated in the Krebs cycle when 2 molecules of glucose are oxidized

How Krebs cycle move to produce glucose molecule?

The Krebs cycle,  TCA cycle or the citric acid cycle, is a series of enzyme-catalyzed reactions occurring  in the mitochondrial matrix and involves the oxidation of acetyl-CoA.

The acetyl group of acetyl-CoA is oxidized to make two molecules of CO2 in a succession of eight steps, while also producing one ATP. Additionally, reduced high-energy molecules like NADH and FADH2 are created.

Each glucose molecule produces two acetyl-CoA molecules, the Krebs cycle must  move twice for one glucose molecule to produce the four CO2, six NADH, two FADH2, and two ATPs.

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Identify one advantage to each of the following models of electron configuration: Dot structures Arrow and line diagrams Written electron configurations Type in your answer below.

Answers

Simple Lewis dot structures make it easy to see how many valence electrons are present in an atom. Valence electrons are shown as dots surrounding the atom that are organized in pairs in Lewis dot formations.

Electron spin direction is displayed using arrow and line diagrams, along with each orbital. The electron configuration of atoms is shown using arrow and line diagrams or orbital diagrams, which use boxes and arrows to indicate the different orbitals and the pairing arrangement of electrons. This model has the benefit of displaying each orbital as well as the electrons' spin polarity.

Written electron configurations are concise and also depict how the electrons are distributed throughout the sublevels. The number of electrons in a specific sublevel is indicated by superscripts in written electron configuration notation. Written electronic configuration has the advantage of being more compact due to the removal of boxes and arrows. It also displays how electrons are distributed among sublevels.

The arrangement of electrons within an atom's orbitals, shells, and subshells is known as electron configuration.

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Answer:

Dot structures make it easy to count electrons and they show the number of electrons in each electron shell.

Arrow and line diagrams show the spin of electrons and show every orbital.

Written configurations require minimal space and show the distribution of electrons between subshells.

Explanation:

correct on edg 2023

How many moles in 28 grams of UO22- ?

Answers

The amount, in moles in 28 grams of [tex]UO_2[/tex] would be 0.1037 mol.

Moles determination

The mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. This can be mathematically expressed as:

Mole = mass/molar mass

Molar mass of [tex]UO_2[/tex] = 238 + (16x2) = 270 g/mol

Thus, the number of moles in 28 grams of [tex]UO_2[/tex] would be:

Mole = 28/270 = 0.1037 mol

In other words, the number of moles in 28 grams of [tex]UO_2[/tex] would be 0.1037 mol.

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How many moles in 28 grams of UO2?

Glass is typically produced by mixing sand (quartz or silica, SiO_2) with other compounds or minerals, which are then crushed, melted, and then cooled (vitrification). Given the compositions and properties of the different types of glass in the table above, consider the role each compound plays in the type of glass formed, and then complete the statements below. Match the compounds in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Adding to the mixture that undergoes vitrification produces a glass with brilliant optical properties. Adding to the mixture that undergoes vitrification produces a glass that can be used for baking purposes or storing chemical solutions. Adding to the mixture that undergoes vitrification produces a glass that is insoluble in water. Adding to the mixture that undergoes vitrification allows the glass to be produced at much lower temperatures.

Answers

Addition of soda (Na₂CO₃) to the vitrifying mixture produces glasses with excellent optical properties.

Give a brief account on silica?

Silica is the common name for the compound silicon dioxide, which consists of one silicon atom and two oxygen atoms. It is an important component of many rocks, sands, and clays, and is also found in many plants and animals. Silica is used in a wide variety of products, from beer and wine to pottery, glass, and paint. It is also used in building materials such as concrete and mortar, and as a food additive. Silica is also used to make silicon-based electronics such as computer chips.

Adding lime (CaCO₃) to the vitrifying mixture creates a jar that can be used to bake or store the liquid medicine.

Addition of alumina (Al₂O₃) to a mixture undergoing vitrification produces a glass that is insoluble in water.

Addition of borax (Na₂B₄O₇) to the mixture during vitrification allows glass to be produced at much lower temperatures.

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Complete this Lewis structure for S2O32− by adding lone pairs and formal charges.
Add lone-pair electrons and formal charges to this structure.

Answers

The complete lewis structure is shown in the below figure by adding lone pairs and formal charges.

Assign the valence electrons to each atom as dictated by the periodic table placing one electron at each compass direction and then pairing them only after the first four until you have place all of the atom’s valence electrons. (See the Roman numeral above the group/column it is in.)

Arrange the remaining atoms around the central atom and join them to the central atom by a single bond. The more electronegative atoms are typically farther away from the center and attaching hydrogen last is advised.

Lone electrons (not lone pairs) indicate an ability to form more covalent bonds, resulting in either double or triple bonds. Their presence or the lack of a full octet on any atom indicates there is a better Lewis structure.

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What is the concentration if I have 200 mL of water and dissolve 13g of salt in it? Show your work!

Answers

Answer:

The concentration is 0.065g/mL

Explanation:

Given

[tex]m = 13g[/tex] --- mass of salt

[tex]V =200mL[/tex] --- volume of water

Required

Determine the concentration (C)

This is calculated as:

[tex]C = \frac{m}{V}[/tex]

[tex]C = \frac{13g}{200mL}[/tex]

[tex]C = \frac{13}{200}g/mL[/tex]

[tex]C = 0.065g/mL[/tex]

The concentration is 0.065g/mL

Which of the following ions has the largest radius?
a. Na+
b. K+
c. CS+
d. Li+

Answers

The size of an ion is determined by its atomic radius, which is a measure of the size of the atom from which the ion is formed. The atomic radius of an atom is generally determined by the size of its electron cloud. The size of the electron cloud is influenced by the number of electrons and the energy levels they occupy.

Of the ions given, Li+ has the smallest atomic radius because it has the smallest number of electrons and the highest effective nuclear charge, which means that its electrons are held more closely to the nucleus. Na+, K+, and CS+ have larger atomic radii than Li+ because they have more electrons and lower effective nuclear charges, which means that their electrons are held more weakly by the nucleus.

Therefore, the answer is CS+ has the largest radius.

How can you tell by looking at the graph if a substance is solid, liquid, or gas at room temperature?

Answers

Louis Tomlinson I have to go to the park to park on the bus stop at Walgreens

how many sublevels are in Silicon

Answers

There is 5 orbitals!

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Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of cobalt-60 atoms will remain in a particular sample after 26.5 years

Answers

The fraction of cobalt-60 atoms remaining after 26.5 years is approximately 0.25 (1/4).

What is atom?

An atom is the smallest unit of matter that still retains its properties. It consists of a nucleus, which is made up of protons and neutrons, surrounded by electrons that orbit the nucleus. Atoms are the building blocks of all matter and can combine to form molecules. Atoms are also constantly in motion and can be found in everything from air to rocks. They are essential for life, as they make up all the molecules that form the cells and organs in the human body.

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If there are 6 atoms of hydrogen on the products side, how many molecules of H2 are on the reactants side?

Answers

If there are 6 atoms of hydrogen on the products side, then there would be 6 atoms of hydrogen also on the reactants side. That would be 3 molecules of [tex]H_2[/tex].

Law of conservation of atoms

According to the law of conservation of atoms or matter, atoms can neither be destroyed nor created during the course of chemical reactions. However, atoms can change forms during reactions.

Going by this law, it means the number of atoms of a particular element must remain constant before and after chemical reactions. Otherwise, we will say the chemical equation of such reactions are not balanced.

Thus, if there are 6 atoms of hydrogen on the products side of a reaction, 6 atoms of hydrogen must also be on the reactants side of the reaction. A molecule of hydrogen, [tex]H_2[/tex], has 2 atoms of hydrogen. This means 3 molecules of hydrogen must be on the reactants side in order to have a total of 6 hydrogen atoms.

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Which supports the idea that conservation of mass is a scientific law instead of a hypothesis?

A- It is an educated guess.

B- It has been tested and supported once or twice.

C- It has been examined, tested and supported over centuries.

D- It has been tested many times and sometimes is true and sometimes isn’t.

Answers

Answer:

C- It has been examined, tested and supported over centuries.

Explanation:

The conservation of mass is a scientific law that states that matter cannot be created or destroyed, only transformed from one form to another. This law has been extensively tested and supported over centuries of scientific investigation, and it is considered to be a fundamental principle of chemistry and physics.

A gas made up of atoms escapes through a pinhole 0.920 times as fast as Cl 2 gas. Write the chemical formula of the gas

Answers

Answer:

The gas with molar mass 83.9 g is Krypton, Kr

Explanation:

We know that as per Ghram's law of diffusion,

r'/ r= square root (M/M')

0r [tex]\frac{r'}{r } =\sqrt{\frac{M}{M'} }[/tex]

Where

r= rate of diffusion of Cl2

r'= rate of diffusion of unknown gas= 0.920r

Also, M= molar mass of Cl2= 71 g/ mol

And, M'= molar mass of unknown gas which we have to find

Let us substitute the values in above equation

[tex]\frac{0.920r}{r } =\sqrt{\frac{71}{M'} }[/tex]

solving we get M' = 83.9 g/mol

Therefore,  the gas with molar mass 83.9 g is Krypton,Kr

According to the data, the temperature of the
substance is 28°C. If we know that 0°C = 273 K,
what is the temperature of the substance in
Kelvin?

Answers

Answer: 351

Explanation: From °C to kelvin we do

K=273+°C

From Kelvin to °C we do

°C=K-273 or -273+ K

When 45. 8 g of alanine (C3H7NO2) are dissolved in 1200g of a certain mystery liquid X, the freezing point of the solution is 4. 10 ℃ less than the freezing point of pure X. Calculate the mass of sodium chloride that must be dissolved in the same mass of X to produce the same depression in freezing point. The van't Hoff factor i=1. 82 for sodium chloride in X. Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits

Answers

16.5 g is the mass of sodium chloride that must be dissolved in the same mass of X to produce the same depression at freezing point.

What are a molar mass and a mole?

Avogadro's number (6.022 x 1023) of molecules (or formula units) make up one mole of a substance (ionic compound). The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the number of grams per mole of a substance, to put it another way.

ΔT = Kc*W*i

Kc = cryoscopy constant of the solute X

W = molality of the solution

i = van't Hoff factor, For organic molecules, such as alanine, i = 1.

n = 45.8/89.09

n = 0.5141 mol

W = 0.5141/1.2 = 0.4284 mol/kg

So, Kc of X is:

4.10 = Kc*0.4284*1

Kc = 9.57 °C.kg/mol

So, if now sodium chloride is added to X, and the temperature change is the same, and i = 1.82:

4.10 = 9.57*W*1.82

W = 0.2354 mol/kg

The number of moles of the solute is then:

W = n/1.2

0.2354 = n/1.2

n = 0.2825 mol

The molar mass of sodium chloride is 58.44 g/mol, thus the mass is the molar mass multiplied by the number of moles:

m = 58.44*0.2825

m = 16.5 g

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I need to know the Lewis structure for

CCI4

H2O

O2

N2

PH3

Please and thank you.

Answers

Two solitary sigma bonds are visible in the Lewis structure between the hydrogen and oxygen atoms.

What is Lewis structure explain with example?

The octet rule is a theory that describes how atoms share electrons so that each atom has eight electrons in its outer shell. This idea is the foundation of a Lewis structure. An oxygen atom, as an illustration, has six electrons in its outer shell.

The entire molecule's electron density is concentrated only around the core C in the CCl4 Lewis structure. Two nitrogen atoms are connected by a triple bond in the N2 Lewis structure.

In the reaction described above, PH3 is acting as a Lewis base because of the single electron on the P atom.

A double bond exists between two oxygen atoms in the Lewis structure of O2. Oxygen atoms must form two bonds in order to comply with the octet rule. The oxygen (red) and hydrogen (white) atoms are held together by powerful connections known as covalent bonds.

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What is the main function of meter?

Answers

The main function of the meter rule is to measure the distance between the two points , it is use to measure the length.

The first unit of the length is the meter. the length is defined as the distance between the two points.  the meter is used to measure the length in the international system of the units. the instrument used to measure the meter is the meter rule or the meter stick. the mete rule is also called as the ruler. before the meter rule of discovery we use the primitive methods to measure the distance.

Thus, the function of the meter is the to measure the distance between the two points.

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What causes stress in rocks? and What happens when stress is released?

Answers

When plates are pushed or pulled, the rock is subjected to stress. Stress can cause a rock to change shape or to break

Awarding 50 points for this question!!

From the paragraph in the image, what are the independent, dependent, and control variables?

Answers

Answer:

there is no paragraph

Explanation:

There isn’t a paragraph

In the 1930s a telephone-company engineer named Karl Jansky was trying to track down

Answers

Answer:

In the 1930s a telephone-company engineer named Karl Jansky was trying to track down the cause of hissing static in phone lines when he discovered something strange. Radio energy from outer space was interfering with the phone signals. After learning about Janksy's discovery, a radio engineer named Grote Reber decided to investigate.

Explanation:

What is the mass in grams of 1.56 moles of aspartame?

Answers

459.1 g of aspartame has a 1.56 moles of aspartame.

Artificial sweetener aspartame is potent and low in calories. About 200 times sweeter than sugar, it is a white, odourless powder. It is legal to use in Europe as a tabletop sweetener, an energy-reducing food ingredient in beverages, desserts, and sweets, dairy products, chewing gum, and other foods.

Aspartame is a dipeptide that is created through the formal condensation of the amino group of methyl L-phenylalaninate with the alpha-carboxy group of L-aspartic acid.

Here, aspartame has 1.56 moles.

Molar mass of aspartame = 294.40 g/mol

So, Number of moles of aspartame = [tex]\frac{Given Mass}{Molar Mass}[/tex]

Mass of aspartame = Number of moles × Molar mass

or, mass = 1.56 × 294.3

or, mass = 459.1 g

Hence, Mass of aspartame of 1.56 moles of aspartame is 459.1 g.

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What observation is made when magnesium powder and lead(ii) are heated together​

Answers

Answer:

in the lead strip the will be no change and no reaction. this is job salvation that is made when magnesium powder and lead to our heater together

Calculate the number of molecules in 9.03 liters of carbon dioxide gas at standard temperature and pressure.

Answers

9.03 liters of carbon dioxide gas would contain 0.40 moles of carbon dioxide molecules. Since 1 mole of any gas contains 6.02 x 10^23 molecules, the number of molecules of carbon dioxide gas in 9.03 liters of carbon dioxide gas at STP would be 2.41 x 10^23 molecules.

What is molecules?

Molecules are the smallest units of matter that can exist by themselves. They are composed of two or more atoms that are held together by chemical bonds. Molecules can be found in the air we breathe, the water we drink, and the food we eat. They can also be found in living organisms, like plants and animals. Molecules can be made of a variety of different atoms, such as oxygen, carbon, nitrogen, and hydrogen.

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