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Which of the following technologies was NOT created during World War 2? A) Computer B) Antibiotics C) Microwave D) Atomic Bombs

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Which of the following technologies was NOT created during World War 2? A) Computer B) Antibiotics C) Microwave D) Atomic Bombs

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What atomic or hybrid orbitals make up the sigma bond between br and f in bromine trifluoride, brf3?

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Answered by answersmine AT 22/10/2019 – 05:32 AM

Draw the Lewis structure. Bromine has 3 bonds and two lone pairs for a trigonal bipyramidal electron geometry and an sp^3d hybridization. Fluorine is peripheral it does not require hybridization, but we often consider it to be hybridized too – it has 1 bond and 3 lone pairs for sp^3 hybridization. So the sigma bonds come from an overlap of an sp^3d orbital on Br with an sp^3 orbital on F. If you don’t consider the F to be hybridized the overlap would have to be to a p orbital on the F

Post your answer

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If Uranium-234 decays via alpha emission, what is the likely product of radioactive decay? (U, atomic no. = 92)

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Answer: The correct answer is alpha radiation.

Explanation:

For the given options:

Option 1: Alpha

Alpha decay is defined as the process in which alpha particle is emitted. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a charge of +2 units. The released alpha particle is also known as helium nucleus.

_Z^Atextrm{X}rightarrow _{Z-2}^{A-4}textrm{Y}+_2^4alpha

Option 2: Beta

Beta decay is defined as the process in which beta particle is emitted. In this process, a neutron gets converted to a proton and an electron.  The released beta particle is also known as electron.

_Z^Atextrm{X}rightarrow _{Z+1}^Atextrm{Y}+_{-1}^0beta

Option 3: Gamma

Gamma decay is defined as the process in which an unstable nuclei gives off excess energy by a spontaneous electromagnetic process and thus releases gamma -radiations. These radiations does not carry any charge and are electrically neutral.

_Z^Atextrm{X}^*rightarrow _Z^Atextrm{X}+_0^0gamma

Option 4: Isotope

Isotope is defined as the chemical specie which belong to the same element but differ in their molecular mass.

Hence, the correct answer is alpha radiation.

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An atom of the element iron has an atomic number of 26 and an atomic mass number of 56. if it is neutral, how many protons, neutrons, and electrons does it have?

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The unknown of this problem is the experimental percent of water in the compound in order to remove the water of hydrogen, given the following:

Mass of crucible, cover and contents before heating                               23.54 g
Mass of empty crucible and cover                                                            18.82 g
Mass of crucible, cover, and contents after heating to constant mass     20.94 g

In order to get the answer, determine the following:

Mass of hydrated salt used                          = 23.54 g – 18.82 g = 4.72 g
Mass of dehydrated salt after heating          = 20.94 g – 18.82 g = 2.12 g
Mass of water liberated from salt                 = 4.72 g – 2.12 g = 2.60 g

Then solve the percent of water in the hydrated salt by:

% water = (mass of water / mass of hydrated salt) x 100
% water = 2.60 g / 4.72 g x 100
% water = 55.08 % in the compound 

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The second shell in the ground state of atomic argon contains ________ electrons.

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The second shell in the ground state of atomic argon contains ________ electrons.

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Use the drop-down menus to show the development of the atomic theory from the oldest theory (1) to the most recent theory (5). Bohr: Dalton: Rutherford: Schrödinger and others: Thomson:

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Karl Marx developed the economic theory of communism.

Further Explanation:

One of Karl Marx’s most famous contributions came in his book the Communist Manifesto. This book explained Mark’s views on government, the economy, and ultimately lead to the creation of communism as an idea.

A communism system is one that is economic and political in nature. In this system, the government would control the means of production, the distribution of goods and resources, and would overall have significant control over society. This system of communism is the opposite of the capitalist/democratic system used in America today. These two ideologies would clash during the mid 20th century in what is now known as the Cold War.

Marx’s ideas were based on his observations of the world around him. He felt that the mistreatment of labor by industry and private corporations would ultimately lead to an uprising by angry laborers all over the world.

Learn More:

Explanation of Cold War- brainly.com/question/1596857

Key Details:

Topic: World History, Communism

Grade Level: 7-12

Keywords: Karl Marx, Communism, Communist Manifesto

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After scientists discovered electrons and protons, what led them to believe there was a third subatomic particle? A. Elements have molar masses that are numerically equal to their atomic mass. B. The mass of an atom’s nucleus is greater than the combined masses of an atom’s protons. C. The mass of an atom is greater than the combined masses of an atom’s protons and electrons. D. Elements have isotopes that have the same atomic number but different atomic mass numbers.

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The unknown of this problem is the experimental percent of water in the compound in order to remove the water of hydrogen, given the following:

Mass of crucible, cover and contents before heating                               23.54 g
Mass of empty crucible and cover                                                            18.82 g
Mass of crucible, cover, and contents after heating to constant mass     20.94 g

In order to get the answer, determine the following:

Mass of hydrated salt used                          = 23.54 g – 18.82 g = 4.72 g
Mass of dehydrated salt after heating          = 20.94 g – 18.82 g = 2.12 g
Mass of water liberated from salt                 = 4.72 g – 2.12 g = 2.60 g

Then solve the percent of water in the hydrated salt by:

% water = (mass of water / mass of hydrated salt) x 100
% water = 2.60 g / 4.72 g x 100
% water = 55.08 % in the compound 

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What argument did people who opposed using the atomic bomb on Japan make to support their point of view

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The Songhai leader who left a
legacy through the reforms in his empire was Muhammad I Askia or Muhammad Ture.
Under his governance, he began organizing his land by setting up regions which
were under the leadership of governors together with their armies under the
ruling of a general and an admiral.  He
also began setting departments and offices for finance, justice, interior, agriculture,
etc. He indeed strengthened the administrative system of what his predecessor
had left unorganized.  After a lot of
quests and changes in his governance, he was able to expand and strengthened
his empire. In 1528, he was defeated and overthrown by his son, Askia Musa. 

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Find the nuclear binding energy of potassium-40 (atomic mass = 39.9632591 amu) in units of joules per nucleon. [data: neutron mass = 1.674928 × 10–24 g; proton mass = 1.672623 × 10–24g; electron mass = 9.109387 × 10–28 g; na = 6.0221367 × 1023 /mol; c = 2.99792458 × 108 m/s]

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The gravitational force Fg between two objects is given by the equation:

Fg=(G*m₁*m₂)/r₂, where G=6.67*10^-11 m³ kg⁻¹ s⁻² is the gravitational constant, m₁ and m₂ are the masses of the two bodies and r is the distance between those bodies. 

Due to the gravitational attraction the pencil and the eraser will attract if we there is no friction on the surface. 

m₁=10 g=0.01 kg is the mass of the pencil
m₂=20 g=0.02 kg is the mass of the eraser
r=2.5 cm = 0.025 m

First we calculate the Fg:

Fg={(6.67*10^-11)*0.01*0.02}/(0.025²)=2.1344*10^-11 N

To get the velocity v of the pencil:

v²=2as, where a is the acceleration of the pencil and s is the path. In our case s=r so we can write:

v²=2ar

a=Fg/m₁= 2.133*10^-9 m/s²

v²=2*(2.133*10^-9)*0.025=1.0665*10^-10

v=√(1.0665*10^-10)=1.0327*10^-5 m/s

We have the velocity and the acceleration, so we can calculate the time t with the equation:

t=v/a=(1.0327*10^-5)/(2.133*10^-9)=4841.6 s

1 hour has 3600 s so when we divide time t in seconds by 3600 we get time T in hours:

T=t/3600=4841.6/3600=1.3449 h. 

So the time for the pencil and eraser to touch is T=1.3449 hours. 

Also time T can be expressed like T= 1h and 20 mins and 41.64 s

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Rank the following elements by atomic radius , Na S Al Ar Si

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Rank the following elements by atomic radius , Na S Al Ar Si

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He atomic mass of an element is equal to ________. its mass number its atomic number one-twelfth of the mass of a carbon-12 atom the mass of an “average atom” the mass of the heaviest isotope

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The unknown of this problem is the experimental percent of water in the compound in order to remove the water of hydrogen, given the following:

Mass of crucible, cover and contents before heating                               23.54 g
Mass of empty crucible and cover                                                            18.82 g
Mass of crucible, cover, and contents after heating to constant mass     20.94 g

In order to get the answer, determine the following:

Mass of hydrated salt used                          = 23.54 g – 18.82 g = 4.72 g
Mass of dehydrated salt after heating          = 20.94 g – 18.82 g = 2.12 g
Mass of water liberated from salt                 = 4.72 g – 2.12 g = 2.60 g

Then solve the percent of water in the hydrated salt by:

% water = (mass of water / mass of hydrated salt) x 100
% water = 2.60 g / 4.72 g x 100
% water = 55.08 % in the compound 

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How Does The Modern Periodic Table Arrange Elements? By Atomic Mass By Atomic Number By Number Isotopes By Electron Mass

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The unknown of this problem is the experimental percent of water in the compound in order to remove the water of hydrogen, given the following:

Mass of crucible, cover and contents before heating                               23.54 g
Mass of empty crucible and cover                                                            18.82 g
Mass of crucible, cover, and contents after heating to constant mass     20.94 g

In order to get the answer, determine the following:

Mass of hydrated salt used                          = 23.54 g – 18.82 g = 4.72 g
Mass of dehydrated salt after heating          = 20.94 g – 18.82 g = 2.12 g
Mass of water liberated from salt                 = 4.72 g – 2.12 g = 2.60 g

Then solve the percent of water in the hydrated salt by:

% water = (mass of water / mass of hydrated salt) x 100
% water = 2.60 g / 4.72 g x 100
% water = 55.08 % in the compound 

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Consider the reaction. mc028-1.jpg Which statement is true at STP? (The atomic mass of Zn is 65.39 u.) 2 mol of HCl produce 1 L of H2 gas. 1 L of Zn produces 1L of H2 gas. 65.39 g of Zn produce 22.4 L of H2 gas. 1 L of HCl produces 1 mol of H2 gas.

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Consider the reaction. mc028-1.jpg Which statement is true at STP? (The atomic mass of Zn is 65.39 u.) 2 mol of HCl produce 1 L of H2 gas. 1 L of Zn produces 1L of H2 gas. 65.39 g of Zn produce 22.4 L of H2 gas. 1 L of HCl produces 1 mol of H2 gas.

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Which of the following statements is true about the D-Day invasion? It originated in Paris. It occurred during the beginning of the war. It led to the liberation of France and Belgium. It involved the use of atomic bombs.

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The correct answers are A, B, and E.

A. Many revolutions took years to accomplish.

Most of Latin American independence revolutions started around 1810, taking advantage of the Spanish political turmoil that started when the Spanish King, Fernando VII, was imprisoned by Napoleon, and they finished within the following decade or more.

B. European countries lost valuable lands.

Before the independence revolutions, Spain and Portugal owned most of the lands that form Latin America, and they lost these lands reach in natural resources in the hands of the new Latin American states.

E. Revolutionaries became heroes in their countries.

The leaders of the Latin American revolutions became heroes and the founding fathers of the new Latin American nations, like Simon Bolivar in Venezuela, Colombia, Ecuador, and Bolivia; Jose de San Martin in Argentina, Chile, and Peru; and the priests Miguel Hidalgo and Jose Maria Morelos in Mexico, to name just a few.

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An uncharged atom of gold has an atomic number of 79 and an atomic mass of 197. this atom has ________ protons, ________ neutrons, and ________ electrons.

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An uncharged atom of gold has an atomic number of 79 and an atomic mass of 197. this atom has ________ protons, ________ neutrons, and ________ electrons.

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What is the atomic number for an abundant element with mass number 12?

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In order to find the number of moles in a sample we are tasked with first finding the number of moles in that sample.  This is because the moles in a substance indicates the amount of the substance that contains the same number of particles as 12 g of the Carbon-12 isotope [or equivalent to 6.02 × 10²³ (which is used as a standard in the world of moles).

Now,
If moles = mass ÷ molar mass

then mol of aluminum = 100 g ÷ 27g/mol
                                   
                                     = 3.704 mol

Now that you have calculated the moles then you can do a simple ratio and multiplication at arrive at the number of atoms that would be present in the 100 g of aluminum.

                  if 1 mol of aluminum contains 6.02 × 10²³ atoms
                 then let 3.704 mol of aluminum contain x

                  ∴  x = 3.704 mol  × (6.02 × 10²³)
                         
                         = 2.23 × 10²⁴

∴ 100 g of Al would contain  ~ 2.23 × 10²⁴ atoms

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The mass of 1 mol of chromium (atomic mass 51.996 amu) is

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To be able to answer this item, we assume that the given hydrogen gas is ideal such that we are able to use the Ideal Gas equation,
                               PV = nRT
At STP, the values of volume, pressure, and temperature are 22.4 L, 1 atm, and 273.15 K. Solving for n,
                              n = (1 atm x 22.4 L) / (0.0821 L.atm/mol K x 273.15 K)
                                                  n = 0.9988 mols
Each mol of hydrogen gas is 2 g.
                                                 m = (0.9988 mols) x (2 g/1 mol)
                                                   m = 1.9977 g
Density is the quotient of mass and volume,
                           density = 1.9977 g/ 22400 mL
                            density = 8.92 x 10^-5 g/mL

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Why did president harry truman decide to drop the atomic bomb on japan?

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Answer:

The Atlantic Charter, signed on June 22, 1941 by President Roosevelt and British Prime Minister Winston Churchill, reflected growing American support for a policy of  international involvement
.

Explanation:

The Atlantic Charter was a joint declaration signed on August 14, 1941, aboard the USS Augusta, “while sailing somewhere in the Atlantic”, by President Franklin Delano Roosevelt on behalf of the United States and Winston Churchill on behalf of Great Britain.  

The Atlantic Charter was reminiscent of the idealism of Wilson’s Fourteen Points. It was later incorporated into the Declaration of the United Nations approved on January 1, 1942.

This document was not a treaty between the two powers. Nor was it a definitive and official definition of the ends of peace. As the same document expressed, it was an affirmation of “certain common principles in the national politics of our respective countries, in which the hopes for a better future for humanity lie.”

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Choose the atom that has the smallest atomic radius. Rb Na K Li

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1 mol is (always) the same number of units: 6.02 * 10^23 units.

So 0.5 moles  of any gas has the same number of molecules.

Also, we know by the ideal gas laws that a give number of molecules of any gas will occupy the same volume.

Given that the three gases have the same number of atoms in the molecular fomula (2), 0.5 moles will also have the same number of atoms.

g.f.w. stands for grams formula weight and that is different for all of them, because gfw is calcualted from the atomics masses of each atom in the molecule.

Then at STP (standard temperature and pressure) conditions 0.50 moles of any of the gas:

– will contain the same number of molecules,

– will contain the same number of atoms

– will occupy the same volume.

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The atomic number of an element is equal to the number of _____ contained in one atom of that element. protons neutrons electrons protons and neutrons

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1) Reaction

NH4Cl(s) —> NH3(g) + HCl(g)

2) equilibrium equation, Kc

Kc = [NH3] * [HCl]

3) Table of equilibrium formation

step               concentrations
                      
                            NH4Cl(s)                     NH3(g)             HCl(g)

start                      1.000 mole                     0                    0

react                        – x

produce                                                       +x                  + x
                         ——————                ———-              ———–

end                         1 – x                             +x                    +x
            

1 – x = 0.3 => x = 1 – 0.3 = 0.7

[NH3] = [HCl] = 0.7/0.5 liter = 1.4                (I used 0.500 dm^3 = 0.5 liter)

4) Equilibrium equation:

Kc = [NH3] [HCl] = (1.4)^2  = 1.96

Which is the number that you were looking for.

Answer: Kc = 1.96

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Which event pushed the Western Allies to seek a military alliance? a. the successful detonation of the Soviet Union’s first atomic bomb b. the refusal of Soviet Union to accept financial aid under the Marshall Plan c. the communist takeover of the Czech government with Soviet support d. the complete demilitarization of East Germany by the Soviet Union

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Answer:  NATO’s original purpose was to serve as an alliance for defense against the Soviet-led communist block of countries.  

Details:

After World War II, as the Cold War began, the the Soviet Union had shown that it wanted to expand its area of control in Eastern Europe.  In response, the United States, along with Canada, joined with ten European countries in signing the North Atlantic Treaty in 1949.  This created the North Atlantic Treaty Organization (NATO), which was a defensive military alliance of democratic states over against the expanding threat of communism felt in the Cold War environment.  The ten original Western European members of NATO were the United Kingdom, France, Belgium, the Netherlands, Denmark, Norway, Portugal, Italy, Iceland, and Luxembourg.

The formation of the Warsaw Pact was in direct response to the formation of the North Atlantic Treaty Organization (NATO). The Warsaw Pact was given that name because the agreement was signed in Warsaw, Poland.  Established in 1955, the Warsaw Pact included the Soviet Union, Albania, Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, and Romania.  The nations signing the treaty called on each other to defend of any member of the Pact that was threatened by enemy forces.  

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Can you please answer these questions from my study guide? Please answer as many as possible, you don’t need to answer all: Topic 8– Industrial Revolution, Imperialism, and Nationalism 72. In order for a corporation to raise money, what does it sell? 73. Private ownership, profit motive and competition best describe which economy? 74. In what way did the Agricultural Revolution pave the way for the Industrial Revolution? 75. How did the Industrial Revolution affect cities? 76. What was a major benefit of being a stockholder in a corporation? 77. What is Karl Marx most closely associated? 78. When a country extends its rule onto another country it is called: 79. What problem is brewing in Europe in the late 1800’s and early 1900’s? 80. Nationalism is… Topic 9 – World Wars and the Russian Revolution 82. Who was shot that triggered the start of the Great War? 83. World War I was a “total war” in the sense that… 84. What is the policy of glorifying power and keeping an army prepared for war? 85. What region was referred to as the “powder keg” of Europe? 86. What were the Fourteen Points? 87. How did the Treaty of Versailles affect postwar Germany? 88. What did the policy of unrestricted submarine warfare refer to? 89. The purpose of propaganda during World War I was to 90. What impact did Russia’s involvement in World War I have on the Russian government? 91. What is a totalitarian state? 92. What was trench warfare? 93. What is the primary reason the United States became involved in World War II? 94. Why did President Harry Truman decide to use atomic bombs against Japan? 95. What was the main significance of D-Day? 96. What was the Nazi’s “Final Solution”? 97. What was the name of the type of fighting used by Germany in WWII? 98. What economic problem did the U.S. face before WWII? 99. Where was the first atomic bomb dropped?

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OK ill trying my best but here is some don’t take my word for them.

72. they agree to Sell their stock. Corporations raise money and resources to expand by selling their stocks. Stock is a part of that corporation’s ownership. By selling their stock , the corporations could easily get a huge amount of funding through various shareholders.

73.The Five Characteristics of Free Enterprise Capitalism1) Economic freedom2) Voluntary exchange3) Private property rights4) Profit motive5) CompetitionSo im guessing its Free Enterprise Capitalism

74. it led to population growth by increasing the food supply.?(not to sure)

75. it made the population grow faster than the housing supply.(again not to sure)

76. Stockholders are not personally responsible for a corporation’s debts, but share in its profits.

77. Karl Marx is most closely associated with communism.

78. Colonialism? i think

79. ~~~ i dont know 

80. Nationalism is the belief that your own country is better than all others.(https://www.vocabulary.com/dictionary/nationalism)

82. Many events started World War 1, but what specifically triggered it was the Assassination of Arch Franz Ferdinand of Austria. This event was probably the major cause, however, there were other causes such as nationalism (too much pride in one’s country) and socialism as well as militarism. 
Answer: Assassination of Arch Franz Ferdinand 

Please know i don’t own these answers i searched around and got what i could.

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As the atomic number of the metals of Group 1 increases, the ionic radius A. Increases B. Decreases C. Remains the same D. Cannot be determined

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Answer:

6 electrons

Explanation:

With the quantum model of the atom, initiated by Bohr, the orbital (space where is more probably to find the electron) was divided into quantum numbers.

The principal number (n), is the number of the shell, it goes from 1 to 7 and is represented by the letter K, L, M, N, O, P, Q. The maximum number of electrons in the shells are, K = 2, L = 8, M = 18, N = 32, O = 32, P = 18, Q =8.

The secondary number (l) is the subshells, and it goes from 0 to 4 and is represented, in order, for the letter, s, p, d, f. The maximum number of electrons permitted in each subshell is s = 2, p = 6, d = 10, f = 14.

The magnetic number (ml), is represented by orbitals, and it goes from -l to +l, passing by 0. The maximum number of electrons is 2 for each one.

The spin number (ms) refers to the rotation of the electron, and it can be +1/2 or -1/2.

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In bohr’s atomic theory when electron moves from one energy level to another energy level more distant from the nucleus energy is emitted right?

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I’m so glad you asked !

1).  If the bathtub is big enough to accommodate the length, width, and draft
of the ship, and the tub is full of water, then the ship floats in the tub.
(Strange as it may seem, the same can be said of the planet Saturn.)

2).  Momentum is conserved.  ===> The total momentum of (car + bug)
is the same before and after the collision.  ===> The impulse imparted
to the car is equal to the impulse imparted to the bug.  ===> F₁·t = F₂·t .
===> For every action, there is an equal and opposite reaction.
===> The force exerted on the bug is equal to the force exerted on the car.
===> The bug sustains more damage than the car does.

3).  This simple-sounding question is actually a very complicated question.
… You said “an electron”.  Do you mean the same electron ?  Or do you mean
the electric current ?
… The ‘drift velocity’ of the same electron is only millimeters per hour.
… If you’re plugged into a common AC wall socket, then a single electron is
pulled this way, then that way, 60 times a second, and never gets anywhere.
… Electric current flows by means of one electron bumping the next one,
which bumps the next one, which bumps the next one, which bumps the
next one, and so on all along the wire.  So the EFFECT shows up at the
other end of the wire much faster than any single electron gets there.
… That speed depends on the thickness and composition of the wire,
the thickness and composition of the insulation around the wire, the
distance between the two wires in the power cord, and some other things.
It can range anywhere from 45% to 99% of the speed of light.

— If your power cord is 5 feet long and the propagation velocity is 0.99c,
then the answer to your question is  0.000 000 005 13 second.

— If your power cord is 10 feet long and the propagation velocity is 0.45c,
then the answer to your question is   0.000 000 022 6 second.

The actual situation is somewhere in that range.

4).  When you toss a ball or a stone straight up, it goes up for a while
as it slows down, then turns around, then falls for a while as it speeds up. 
It’s fairly easy to prove that it returns to your hand with the same speed
as you tossed it.
So if you toss two stones, with the same speed, from the same height,
one up and one down, then the one that went up and came back has the
same speed as it passes your hand going down. 
They both hit the ground with the same speed.
But there IS one difference:  The one you tossed UP hits the ground LATER !

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President truman’s main reason for using the atomic bomb against japan was to

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Answer:  The Philippines

Further detail:  The United States had taken possession of the Philippines, as well as Guam and Puerto Rico, in 1898, after winning the Spanish-American War.   So US interest in Asia was heightened.  At the same time, other nations had begun competing for “spheres of influence” in trade access with China.

The Open Door policy was issued by the United States in 1899-1900 as a series of dispatches from the US Secretary of State to other nations that had trading interests in China —  Great Britain, Germany, France, Italy, Japan, and Russia.  The policy reasserted earlier agreements that all countries should have equal access to ports in China, without undue preference to “spheres of influence” for one nation or another.  The United States was seeking to maintain an equal footing with other nations in the access to trade in China.

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