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An atom of ordinary carbon has six protons and eight neutrons.A．RightB．WrongC．Not mentione

An atom of ordinary carbon has six protons and eight neutrons.

A．Right

B．Wrong

C．Not mentioned

提问人：网友wl36978 发布时间：2022-01-06

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更多“An atom of ordinary carbon has…”相关的问题

第1题

18 An atom of ordinary carbon has six protons and eight neutronsA RightB WrongC Not mentio

18 An atom of ordinary carbon has six protons and eight neutrons

A Right

B Wrong

C Not mentioned

点击查看答案

第2题

听力原文： What is an atom？ The modern view of an atom has come from many fields of chem

istry and physics. The idea of an atom came from ancient Greek science and philosophy and from the results of 18th and 19th century chemistry. It includes three aspects, concept of the atom, measurements of atomic mass and repeating or periodic relationship between the elements. From the ancient Greeks through today, we have pondered what ordinary matter is made of. To understand the problem, here is a simple demonstration from this book, The Extraordinary Chemistry of Ordinary Things by Carl H. Snyder. At first, take a pile of paper clips which are all of the same size and color; second, divide the pile into two equal piles; third, divide each of the smaller piles into two equal piles; then repeat step 3 until you are down to a pile containing only one paper clip. Now one paper clip still does the job of a paper clip such as hold loose papers together. Now, take a pair of scissors and cut that one paper clip in half. Can half of the paper clip do the same job as the single paper clip？ Certainly not. If you do the same thing with any element, you will reach an indivisible part that has the same properties of the element, like the single paper clip. This indivisible part is called an atom. The idea of the atom was first devised by Democritus in 530 BC. In 1808, an English school teacher and scientist named John Dalton proposed the modern atomic theory. Modern atomic theory simply states the following. Every element is made of atoms—piles of paper clips. All atoms of any element are the same—all the paper clips in the pile are the same size and color. Atoms of different elements are different in size and properties—like different sizes and colors of paper clips. Atoms of different elements can combine to form. compounds—you can link different sizes and colors of paper clips together to make new structures. In chemical reactions, atoms are not made, destroyed, or changed—no new paper clips appear, no paper clips get lost and no paper clips change from one size/color to another. In any compound, the numbers and kinds of atoms remain the same—the total number and types of paper clips that you start with are the same as when you finish. Daltons atomic theory formed the groundwork of chemistry at that time. Dalton envisioned atoms as tiny spheres with hooks on them. With these hooks, one atom could combine with another in definite proportions. But some elements could combine to make different compounds for example; hydrogen + oxygen could make water or hydrogen peroxide. So, he could not say anything about the numbers of each atom in the molecules of specific substances. Did water have one oxygen with one hydrogen or one oxygen with two hydrogens？ This point was resolved when chemists figured out how to weigh atoms. The ability to weigh atoms came about by an observation from an Italian chemist named Amadeo Avogadro. Avogadro was working with gases such as oxygen, hydrogen and noticed that when temperature and pressure was the same, these gases combined in definite volume ratios. Avogadro said that at the same temperature and pressure, equal volumes of the gases had the same number of molecules. So, by weighing the volumes of gases, he could determine the ratios of atomic masses. For example, a liter of oxygen weighed 16 times more than a liter of hydrogen, so an atom of oxygen must be 16 times the mass of an atom of hydrogen. Work of this type resulted in a relative mass scale for elements in which all of the elements related to carbon. Once the relative mass scale was made, later experiments were able to relate the mass in grams of a substance to the number of atoms and an atomic mass unit—amu was found; 1 amu or Dalton is equal to 1.66×10-24 grams. At this time, chemists knew the atomic masses of elements and their chemical properties, and an astonishing phenomenon jumped out at them! Later we will have a look at the following part. The Properties of Elements Showed a Repeating Pattern.Narrator Listen to part of a lecture in the chemistry class. Now get ready to answer the questions. You may use your notes to help you answer.

What is the talk mainly about？

A．The function of an atom.

B．The development of atom theory.

C．The structure of an atom.

D．Methods to find an atom.

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第3题

听力原文：Narrator Listen to part of a lecture in the chemistry class. Professor What is

an atom？ The modern view of an atom has come from many fields of chemistry and physics. The idea of an atom came from ancient Greek science and philosophy and from the results of 18th and 19th century chemistry. It includes three aspects: concept of the atom, measurements of atomic mass and repeating or periodic relationship between the elements. From the ancient Greeks through today, we have pondered what ordinary matter is made of. To understand the problem, here is a simple demonstration from this book, The Extraordinary Chemistry of Ordinary Things by Carl H. Snyder. At first, take a pile of paper clips which are all of the same size and color; second, divide the pile into two equal piles; third, divide each of the smaller piles into two equal piles; then repeat step 3 until you are down to a pile containing only one paper clip. Now one paper clip still does the job of a paper clip such as hold loose papers together. Now, take a pair of scissors and cut that one paper clip in half. Can half of the paper clip do the same job as the single paper clip？ Certainly not. If you do the same thing with any element, you will reach an indivisible part that has the same properties of the element, like the single paper clip. This indivisible part is called an atom. The idea of the atom was first devised by Democritus in 530 BC In 1808, an English school teacher and scientist named John Dalton proposed the modern atomic theory. Modern atomic theory simply states the following: Every element is made of atoms- piles of paper clips. All atoms of any element are the same—all the paper clips in the pile are the same size and color. Atoms of different elements are different in size and properties like different sizes and colors of paper clips. Atoms of different elements can combine to form. compounds—you can link different sizes and colors of paper clips together to make new structures. In chemical reactions, atoms are not made, destroyed, or changed no new paper clips appear, no paper clips get lost and no paper clips change from one size/color to another. In any compound, the numbers and kinds of atoms remain the same the total number and types of paper clips that you start with are the same as when you finish. Daltons atomic theory formed the groundwork of chemistry at that time. Dalton envisioned atoms as tiny spheres with hooks on them. With these hooks, one atom could combine with another in definite proportions. But some elements could combine to make different compounds for examples hydrogen + oxygen could make water or hydrogen peroxide. So, he could not say anything about the numbers of each atom in the molecules of specific substances. Did water have one oxygen with one hydrogen or one oxygen with two hydrogens？ This point was resolved when chemists figured out how to weigh atoms. The ability to weigh atoms came about by an observation from an Italian chemist named Amadeo Avogadro. Avogadro was working with gases such as oxygen, hydrogen and noticed that when temperature and pressure was the same, these gases combined in definite volume ratios. Avogadro said that at the same temperature and pressure, equal volumes of the gases had the same number of molecules. So, by weighing the volumes of gases, he could determine the ratios of atomic masses. For example, a liter of oxygen weighed 16 times more than a liter of hydrogen, so an atom of oxygen must be 16 times the mass of an atom of hydrogen. Work of this type resulted in a relative mass scale for elements in which all of the elements related to carbon. Once the relative mass scale was made, later experiments were able to relate the mass in grams of a substance to the number of atoms and an atomic mass unit—amu was found; 1 amu or Dalton is equal to 1. 66 x 10~24 grams. At this time, chemists knew the atomic masses of elements and their chemical properties, and an astonishing phenomenon jumped out at them! Later we will have a look at the following part: The Properties of Elements Showed a Repeating Pattern. Now get ready to answer the questions. You may use your notes to help you answer. 1. What is the talk mainly about？ 2. In the lecture, the professor describes the modern atom theory. Tick on the correct box for each statement. 3. Why does the professor mention paper clips？ 4. According to the speech, who found the way to weigh atoms？ 5. What does the professor mean when he says this？ Professor If you do the same thing with any element, you will reach an indivisible part that has the same properties of the element, like the single paper clip. Listen again to part of the lecture. Then answer the question. Professor Did water have one oxygen with one hydrogen or one oxygen with two hydrogens？ This point was resolved when chemists figured out how to weigh atoms. 6. What does the professor mean by saying this ？ Professor This point was resolved when chemists figured out how to weigh atoms.Narrator Listen to part of a lecture in the chemistry class. Now get ready to answer the questions. You may use your notes to help you answer.

What is the talk mainly about？

A．The function of an atom.

B．The development of atom theory.

C．The structure of an atom.

D．Methods to find an atom.

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第4题

Walt Whitman is often called the poet of American democracy（民主). He lived during the Ame

Walt Whitman is often called the poet of American democracy(民主). He lived during the American Civil War, and he admired president Abraham Lincoln very much.

Whitman was the first American poet who wrote about true equality among all other people. In a poem called Song of Myself he compared himself to all other people, and he found no difference. He wrote,

"...every atom belonging to me...belongs to you".

In the same poem Whitman spoke up for women. He wrote,

"The Female equally with the Male I sing".

He also wrote,

"In the faces of men and women I see God".

And "A great city is that which has the greatest men and women".

Whitman understood war and the results of war. He worked in a hospital, taking care of wounded men. In a description of northern soldiers who had returned from prisons in the south he wrote, "The sight is worse than any sight of battle fields or any collection of the wounded, even the bloodiest". In Whitman's words, "The real war will never get in the books."

Whitman was the first important American poet to write about ordinary people with ordinary language.

Through Whitman's lines, we can see ______.

A．he wanted to sing a song for himself

B．he was very proud of himself

C．his strong feeling towards the true equality among all people

D．it is God that created man

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第5题

Task 2Directions: This task is the same as Task 1.The 5 questions or unfinished statements

Task 2

Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.

Walt Whitman is often called the poet of American democracy(民主). He lived during the American Civil War, and he admired president Abraham Lincoln very much.

"...every atom belonging to me...belongs to you".

In the same poem Whitman spoke up for women. He wrote,

"The Female equally with the Male I sing".

He also wrote,

"In the faces of men and women I see God".

And "A great city is that which has the greatest men and women".

Whitman was the first important American poet to write about ordinary people with ordinary language.

Through Whitman's lines, we can see ______.

A．he wanted to sing a song for himself

B．he was very proud of himself

C．his strong feeling towards the true equality among all people

D．it is God that created man

点击查看答案

第6题

Energy equals mass times the speed of light squared. This is the famous equation of Albert

Einstein. It(51)to the category of the theory of relativity, and it equates energy with mass.

All things are made up of atoms. When(52)of an atom travels at almost the speed of light(53)we put more energy into it to increase the speed, it begins to in crease in mass. The energy that makes it travel fast cannot make it travel(54)the speed of light—nothing(55)light can travel that fast- so the energy goes into the thing(56)and increases its mass. Energy(57)into mass.

Why is the theory called the theory of relativity？ A thing that is relative depends upon(58)else to identify it or to define it. In relativity theory we identify or define mass, time, and length(59)to the speed of light.

When something is at rest, it looks(60)in length. However, when it travels at almost the speed of light, it becomes(61). Time also changes. However, the change in time is(62)to the change in length. The length of a thing becomes short(63)time becomes long.

If you want to(64)young, relative to a friend, take a trip in a spaceship that travels at(65)the speed of light. And, although time and heartbeat seem ordinary to you in the spaceship, when you return, look at your friend; Relative to you, he or she is old.

A．prefers

B．relates

C．belongs

D．adheres

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第7题

The word laser was coined as an acronym for Light Amplification by the Stimulated Emission

of Radiation. Ordinary light, from the Sun or a light bulb, is emitted spontaneously, when atoms or molecules get rid of excess energy by them-selves, without any outside intervention. Stimulated emission is different because it occurs when an atom or molecule holding onto excess energy has been stimulated to emit it as light.

Albert Einstein was the first to suggest the existence of stimulated emission in a paper published in 1917. However, for many years physicists thought that atoms and molecules always were much more likely to emit light spontaneously and that stimulated emission thus always would be much weaker. It was not until after the Second World War that physicists began trying to make stimulated emission dominate. They sought ways by which one atom or molecule could stimulate many others to emit light, amplifying it to much higher powers.

The first to succeed was Charles H. Townes, then at Columbia University in New York. Instead of working with light, however, he worked with microwaves, which have a much longer wavelength, and built a device he called a "maser," for Microwave Amplification by the Stimulated Emission of Radiation. Although he thought of the key idea in 1951, the first maser was not completed until a couple of years later. Before long, many other physicists were building masers and trying to discover how to produce stimulated mission at even shorter wavelengths.

The key concepts emerged about 1957. Townes and Arthur Schawlow, then at Bell Telephone Laboratories, wrote a long paper outlining the conditions needed to amplify stimulated emission of visible light waves. At about the same time, similar ideas crystallized in the mind of Gordon Gould, then a 37-year-old graduate student at Columbia, who wrote them down in a series of notebooks. Townes and Schawlow published their ideas in a scientific journal, Physical Review Letters, but Gould filed a patent application. Three decades later, people still argue about who deserves the credit for the concept of the laser.

Which of the following statements best describes a laser？

A．A device for stimulating atoms and molecules to emit light.

B．An atom in a high-energy state.

C．A technique for destroying atoms or molecules.

D．An instrument for measuring light waves.

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第8题

The word laser was coined as an acronym for Light Amplification by the Stimulated Emission

of Radiation. Ordinary light, from the sun or a light bulb, is emitted spontaneously, when atoms or molecules get rid of excess energy by them selves, without any outside intervention. Stimulated emission is different because it occurs when an atom or molecule holding onto excess energy has been stimulated to emit it as light.

Albert Einstein was the first to suggest the existence of stimulated emission in a paper published in 1917. However, for many years physicists thought that atoms and molecules always were much more likely to emit light spontaneously and that stimulated emission thus al- ways would be much weaker. It was not until after the Second World War that physicists began trying to make stimulated emission dominate. They sought ways by which one atom or molecule could stimulate many others to emit light, amplifying it to much higher powers.

The first to succeed was Charles H. Townes, then at Columbia University in New York. Instead of working with light, however, he worked with microwaves, which have a much longer wavelength, and built a device he called a "maser" for Microwave Amplification by the Stimulated Emission of Radiation. Although he thought of the key idea in 1951, the first maser was not completed until a couple of years. Before long, many other physicists were building masers and trying to discover how to produce stimulated emission at even shorter wavelengths.

The key concepts emerged about 1957. Townes and Artyur Schawlow, then at Bell Telephone Laboratories, wrote a long paper outlining the conditions needed to amplify stimulated emission of visible light waves. At about the same time, similar ideas crystallized in the mind of Gordon Gould, then a 37-year-old graduate student at Columbia, who wrote them down in a series of notebooks. Townes and Schawlow published their ideas in a scientific journal, Physical Review Letter, but Gould filed a patent application. Three decades later, people still argue about who deserves the credit For the concept of the laser.

The word "it" (line 5, para 1) refers to______.

A．light bulb

B．energy

C．molecule

D．atom

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第9题

根据以下资料，回答{TSE}题。 Graphene’s Superstrength Big technology Comes in tiny packages．

New Cell phones and personal Computers get smaller every vear，which means these electronics require even smaller Components on the inside．Engineers are 100—king for Creative ways to Build these Components，and they’ve turned their eyes to graphene，a super—thin material，made of Carbon，that Could Change the future of electronics． This year，s Nobel Prize for Physics has Been awarded to Andre Geim and Kostya Novoselov from the University of Manchester，UK for the Discovery of graphene．Graphene isn’t just small，it's “the thinnest Dossible materialin this world．”says Novosetov．He Calls it a “wonder material．”It’s so thin that you would need to stack about 25，000 sheets just to make a pile as thick as a piece of ordinary white paper．If you were to hold a sheet of graphene in your fingers，you’d have no idea Because you wouldn’t Be able to see it． Carbon is one of the most abundant elements in the universe．Every known kind of life Contains Carbon．Graphene is a sheet of Carbon，but only one atom thick．You Don’t have to look far to find gra—phene—it’s all around you． If you want this high—tech wonder stuff，all you need is a pencil，paper and a little adhesive tape. Use the Dencil to shade a small area on the paper，and then apply a small piece of adhesive tape over the area．When you pull up the tape，you’11 see that it pulls up a thin layer of some of the shading from your pencil．That layer isCalled graphite，one of the softest minerals in the world． Now stick the same piece of tape on another sheet of paper and pull the tape up—there shouldBean even thinner layer，this time left on the paper．Now imagine that youDo this over and over，until you get the thinnest possible layer of material on the paper．This layer would Be only one atom thick. and vou wouldn，tBe able to see it．Graphite is made of layers of graphene．so when you get to the thin— nest possible layer，you’ve found graphene． {TS}What would Change the future of electronics according to engineers？

A. Personal Computer．

B. Big technology．

C. Graphene．

D. Creative ways．

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