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## All atoms of the element potassium have 19 protons. One of the most stable types of potassium atoms has the mass number 39. How many neutrons make up one of these potassium atoms? -19 -20 -38 -58

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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## Which statement correctly compares the pH of water to that of other substances? a: The pH of water increases as its temperature increases, while other substances have a stable pH. b: The pH of water is neutral; it is higher than the pH of acids and lower than pH of bases c: Water contains more hydrogen ions than most other substances, giving it a higher pH. d: Water is neutral and has a pH of 0; acids have a pH greater than 0 and bases have a pH less than 0

In tropical rain forest, the animals will have to deal with higher temperatures and greater rainfall. One example of an adaptation they might need is a thin, water-proof coat. This will prevent heat from becoming trapped inside their fur/hair/feathers, and the water-absorbing coating will allow water to stick to the inside of the coat without being absorbed, where the water will absorb the heat instead of themselves, and will cool the through evaporative cooling (heat release through evaporation)

In a deciduous forest, there is much colder temperatures, and significantly less rainfall. These animals would likely want a thicker water-proof coat. This is because the thicker coat would allow heat to become trapped, keeping them warm in the winter, and the water-proof coating prevents water from freezing in their fur, making them colder.

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## Which explains why an activated complex is a high-energy species? activated complexes form during endothermic reactions. activated complexes require new bonds to be made. activated complexes are stable species with strong covalent bonds. activated complexes cannot be formed in the reverse reaction direction?

There are two systems in the human body that are responsible for the coordination between the functions of different systems to achieve the unity of the living organism’s body. These two systems are the nervous system and the endocrine system. The action of the nervous system is fast and takes a short time, while the action of the endocrine system is slow and takes a long time.

The functional unit of the nervous system is the nerve cell or the neuron. The neuron consists of a cell body and the axon. The cell body starts with the dendrites that receive the messages or the impulses from other neurons or from different sense organs or receptors. These impulses are then transmitted through the cell body. The cell body contains a nucleus and different organelles which help the nerve cell to perform its functions. The nerve impulse is then transmitted to the axon.

The axon is an extension from the cell body. There are some cells called Schwan cells that secrete a myelin sheath to insulate the axon from the surrounding medium. The insulated axons have more ability to conduct the impulses than non-insulated axons. The axon ends with the terminal arborizations. The terminal arborizations of a nerve cell connect to the dendrites of the next cell or to the afferent organ. The gaps between the dendrites and the terminal arborizations are called the synapses.

The nerve impulse is an electrochemical phenomenon i.e. an electrical phenomenon with a chemical nature. The membrane of the axon acts as a barrier between an outside positively charged medium and an inside negatively charged medium. This makes a potential difference of  -70mV. This state is called the resting potential. When the membrane is subjected to a stimulus, the positive charges enter to inside and the negative charges exit to the outside. The potential difference now becomes +40mV. This state is called the depolarization state. The point of stimulation acts as a new stimulus for the next point and so on. The membrane sooner gains its permeability again and the positive charges return to the outside and the negative charges to inside. This state is called repolarization.

The nerve impulse reaches the synapse. There are some neurotransmitters that are excited by the nerve impulse coming and carry the message across the membrane. Some receptors receive theses neurotransmitters on the dendrites of the next neuron. These receptors act as a stimulus for the new cell.

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## According to the chart, from 1976-1986, unintentional drug overdose deaths per 100,000 population stayed relatively stable. The numbers for each year are, roughly, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2. What is the mean of these statistics?

1. Social Environment
2. Physical Environment
3. Individual LifeStyle
4. Differential Susceptibilities
5. Perception of Healthcare and to gain access/services
6. Reverse Causality

Reasoning – Under these or all points to underlying of illness to economic problems and depressions.

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## PGA is the first stable product of

PGA is the first stable product of

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## First answer gets Brainliest! What message meant that the United States was not interested in acquiring more territory but wanted to see neighboring countries stable, orderly, and prosperous? A) Canal Zone B) Big Stick C) Roosevelt Corollary D) Monroe Doctrine

What message meant that the United States was not interested in acquiring more territory but wanted to see neighboring countries stable, orderly, and prosperous?

A)    Canal Zone

B)    Big Stick

C)    Roosevelt Corollary

D)    Monroe Doctrine

Explanation:

C, Roosevelt Corollary meant that the United States was not interested in acquiring more territory but wanted to see neighboring countries stable, orderly, and prosperous.

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## What is one way that the post-war reform movements in the British and French colonies might be different if they occurred today? Organizers would make use of social media, such as Facebook, to organize and unify. The movements would be struck down more violently because the British and French governments are more powerful. Reformers would not have demanded change because British and French economies are more stable. Fewer people around the world would be aware of the reformers and their calls for change.

The Reformation actually started after Columbus’s landing in North America.

Treaty of Tordesillas in 1494 was forced on Spain and Portugal by the Pope. The Pope basically said that all lands in the New World belonged to Spain and all new non-Christian lands in the Eastern Hemisphere belong to Portugal. No other Catholic countries can do anything in those areas without the approval of the owner.

The pope basically drew two lines on the globe setting the border. The western line started at the north pole cut half way through Greenland and ended at the south pole. The new world was everything to the west. Problem is that it ran through a chunk of Brazil which is why Brazil is an ex-Portuguese colony.

The Eastern line starts at the North Pole runs through siberia, through the pacific just west of Japan, and cuts Australia in half. Of course, Australia hadn’t been discovered yet. Everything to the the east of this line is the new world.

Obviously, this treaty didn’t hold up well, but the reformation gave the protestant countries an excuse to explore the new world since they didn’t have to take orders from the Pope. Even so, France, a catholic country, ignored it too.

Really, the only country that was effected by the reformation in the exploration of the Americas was England. All the other countries, changed their religion once and then went to war with the nearest catholic country. Sweden became Lutheran and stayed that way. The Dutch Republic became Calvinists and stayed that way.

England kept switching. First it was Catholic. Then, Henry VIII made it protestant. Then, Henry’s daughter Mary I made it catholic again. Henry’s other daughter Elizabeth I (with the two hit movies) made it Protestant again.

Years latter, Oliver Cromwell over through the monarchy, executed the King Charles I, and established a Protestant fundamentalist religious military dictatorship. He outlawed drinking,smoking, gambling, theater, dirty books, sports, prostitution, and anything generally fun. He would have made Saudi Arabia proud. Basically, all you could do is work, pray, and die. Sex was allowed for creating children, but you couldn’t enjoy it.

When Cromwell died, the people of England said enough was enough and brought back the King. Charles II kicked out the fundamentalists and brought back drinking, smoking, gambling, dirty books, sports, prostitution, and having fun during sex. Incidentally, those were also all his hobbies.

This brings us to the famous Pilgrims. They were part of Cromwell’s crowd. They kept agitating a return to the no-fun policy. They annoyed everybody. They weren’t persecuted for practicing their religion, they were persecuted because they kept trying to force their religion on everyone else. Sort of like Southern Baptists.

Charles II was the most easy going monarch in British history. Do realize how annoying you have to be to get him to throw you out.

Charles’s brother James II was obsessed with turning Great Britain catholic again. After four years of trying, they kicked him and his followers out.

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## Earth’s climate ________. select one: a. has been stable over the history of the planet b. is changing as a result of natural and human processes c. will stabilize over the next century, according to the predictions of most scientists d. has changed only once due to the evolution of green photosynthesizing plants e. history is undeterminable because there is no method of studying climatic history of the planet

Natural Forces Affecting the Driver:

1. While the car stops, the person continues moving the way that the car were moving and then hits the obstacle in the car or the person can be thrown out of the vehicle. If the person wears belt, he will stop moving with the vehicle and won’t hit the obstacle.

2. We count approximate kinetic energy using the formula K = v^2. So the vehicle which is moving at 30 mph will have four times less kinetic energy than vehicle which is moving at 60 mph. If they have the same road conditions, the breaking distance will be four times as great for the car moving twice as fast.

3. Kinetic energy depends on object’s mass and velocity and it has direct relationship with the stopping distance. The lesser mass of the vehicle = the lesser kinetic energy and lesser stopping distance. => If both vehicles have the same velocity, then small vehicle has lesser kinetic energy than large vehicle.

4. We know that kinetic energy has this relationship with velocity K = v^2. So the best way to prepare to enter sharp curves in the roadway is to lower the speed. The most appropriate speed is 20-30 mph, but it depends on road conditions and car’s breaks condition.

5. Car crashes can happen with everyone so the best way is to be prepared. First the driver should wear a seatbelt while he’s driving. He should check his tires and breaks condition regularly. And also it’s important to slow down the vehicle while entering sharp curves. Without following these rules, the driver can get catastrophic injuries in a car crash.

Signs, Signals, and Pavement Markings:

1. It doesn’t matter where you go. All you need is to learn highway code. It’s very different to know the meanings of every road sign. Also, it’s necessary to check your car’s conditions and you should take some spare parts for your car in case of accidents. So wherever you go, it’s important to be prepared.

2. You should stop before crossing and take few minutes to make sure there is no train approaching. If there is no train approaching, you can pass a railroad crossing. If you see approaching train, you should wait until it will pass a railroad crossing.

3. You should stop before the lights and wait to check the traffic movement and signs. Make sure that everything is safe and pass the intersection. Don’t move fast to avoid accidents.

4. Flashing yellow light means that it’s not necessary to stop but you should to pay attention on the traffic movement. So it would be better to yield before the lights and make sure if it’s safe to move. After that you can cross the intersection.

5. The line change means that the lane changes and you can’t cross solid lines. Pay more attention on road marking because it shows how you should behave on the road or highway.

6. As you approach the next exit and  your passengers need to use the restroom and get some food, you should look for green signs which indicate food and rest stops. You should to slow down if you don’t want to skip the sign.

7. When you take the exit ramp off the expressway and merge onto the next road, you see yellow lines dividing the roadway which indicates that there is oncoming traffic and this is a two-way highway.

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## Why atoms become more stable when they form bonds?

Why atoms become more stable when they form bonds?

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## According to Maslow, which need are people striving to satisfy when they seek stable places to live and work?

Explanation:  Animals, however well preserved and bred in conditions that are not in nature, that is, not in their natural habitat, animals still retain the animal instinct. Thus, young animals in the wild can be met daily, except for members of their species, and members of all other species, including predators, as well as humans. This means that in the natural environment, young animals can find themselves in a variety of dangers on a daily basis, but not only that. In this way young animals develop their ability to survive, escape from predators, manage, and develop their hunting skills, etc. All this is essential for socialization because according to all these developed skills and abilities their socialization depends. To deny any of the conditions prevailing in the wild means to deny the development of any skill or instinct, to deny proper socialization.

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## Arms that are longer than legs, and a short stable lumbar spine are traits associated with a. full-time bipedalism b. brachiation c. arboreal quadrupedalism d. vertical clinging and leaping

The correct option is 1.

Step-by-step explanation:

It is given that Inez has to pay 4 percent in closing costs and 16 percent for the down payment on a purchase of $225,500 with an ARM. So, Inez has to pay 20% of$225,500.

Therefore Inez has to pay $45100 as closing cost and down payment. Over the life of the loan, she will pay$262,072.72.

The total cost of her house is the sum of $262,072.72 and$45100. Because the total cost is the sum of down payment, closing cost and the payments over the life of the loan.

Therefore the correct option is 1.

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## Which of these alkalis has the most stable fluoride? a) Sodium b) Lithium c) Rubidium d) Potassium

Which of these alkalis has the most stable fluoride? a) Sodium b) Lithium c) Rubidium d) Potassium

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## In general, being more emotionally stable and mature is a characteristic of which stage of adulthood? A. childhood B. young adulthood C. middle adulthood D. older adulthood

“Identical twins” who have been raised apart are typically more similar in intelligence level than biological siblings raised together because they have been born with the same genetic code.

Identical twins originate from a single fertilized egg that parts into two. Before it parts, it is either male or female. After it parts, there are either two guys or two females. The two sections of the fertilized egg embed in the uterus and every create one of the twins.

Identical twins have the equivalent hereditary source. No immediate reason for monozygotic twinning has been resolved; it isn’t innate. Monozygotic twins speak to around 33% all things considered. They may look strikingly comparative, and it might be hard to reveal to them separated.

Lawrence Kohlberg felt that one of the only ways individuals will accomplish the objectives in each of his six stages was to participate in “consensus democracy” in small group settings.

Lawrence Kohlberg felt that the best way to support development through these stages was by discourse of good problems and by investment in consensus democracy inside small groups. Consensus democracy was rule by understanding of the gathering, not larger part rule. This would invigorate and widen the reasoning of youngsters and grown-ups, enabling them to advance starting with one phase then onto the next.

3. The answer is “D.  showing a learner how to correct common mistakes”.

The term scaffolding alludes to a procedure in which instructors display or exhibit how to take care of an issue, and afterward venture back, offering support as required. Analyst and instructional architect Jerome Bruner first utilized the term ‘scaffolding’ in this setting, harking back to the 1960s. The hypothesis is that when understudies are given the help they require while discovering some new information, they stand a superior possibility of utilizing that learning freely. Bruner suggests positive association and three methods of portrayal amid educating: activities, pictures, and dialect.

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## What type of thinking spread during the Renaissance and Reformation periods? a. The ideas of early writers were disregarded. b. Less attention was given to literature and the arts. c. The Catholic Church was considered stable and trustworthy. d. Greater value was placed on individual accomplishments.

What type of thinking spread during the Renaissance and Reformation periods? a. The ideas of early writers were disregarded. b. Less attention was given to literature and the arts. c. The Catholic Church was considered stable and trustworthy. d. Greater value was placed on individual accomplishments.

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## How many electrons do the elements of the most stable group have in their outer energy levels

I think you mean the energy of a particle attached to a spring. In that case the total energy is given by

E=K+P=12mv2+12kx2E=K+P=12mv2+12kx2Where mm is the mass of the particle, vv is the velocity of the particle, and xx is the distance of the particle from the origin. So, the maximum of potential energy PP is given when the kinetic energy KKis zero (i.e. when v=0v=0, in the turning points of the particle). In that case E=PmaxE=Pmax. SoE=Pmax=12kx2maxE=Pmax=12kxmax2here xmaxxmax is the maximum stretch of the spring (i.e. the turning point, v=0v=0).

In the other hand, the maximum of kinetic energy is given when P=0P=0 (it occurs when x=0x=0), i.e. E=KmaxE=Kmax, or

E=Kmax=12mv2maxE=Kmax=12mvmax2where vmaxvmax is the maximun velocity of the particle, it occurs when the particle passes through the origin (i.e. when x=0x=0).

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## Which of these Roman developments resulted in the ability to build larger and more stable structures? A) aqueduct B) arch C) columns D) stairs

The subject of civil wars in the African continent, especially as product of the unbriddled and uncontrolled desire to extract from this land its rich mineral resources, has gone on for decades, and even centuries. But among the many conflicts around this subdeveloped continent, lays the one that originated in three different African nations: Angola, Sierra Leone and Zimbabwe, and the reason for it? B: Diamonds; better known as bloody diamonds. These rough diamonds, that are richly found in these three nations, most especially, became the fuel that have kept many illegal and legal organization going. And conflict arose between different factions for the control of this trade. Beginning in 1975, with the Angolan conflict that started ever since its freedom from Portugal, precisely because of the desire for both national control, and control of the diamond trade, these conflicts have continued through time, bleeding out the countries. The next conflict arose in Zimbabwe, in the 1980´s and it hasn´t stopped, as power over the government and all its trades, including that of diamonds, has been in the hands of one man: Robert Mugabe. Finally, there is the conflict in Sierra Leone, and it happened between 1991 and 2002.

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## Which symbol represents an atom in the ground state with the most stable valence electron figuration

The fomula is NH4 (1+)

There are only two elements N and H.

As per oxidation state rules, the most electronegative element will have a negative oxidation state and the other element will have a positive oxidation state.

N is more electronative than H, so H will have a positive oxidation state and nitrogen will have a negative oxidation state.

You can also use the rule that states the hydrogen mostly has 1+ oxidation state,except when it is bonded to metals.

In conclusion the oxidation state of H in NH4 (1+) is 1+.

Now you must know that the sum of the oxidations states equals the charge of the ion, which in this case is 1+.

That implies that 4* (1+)  + x =   1+

=> x = (1+) – 4(+) = 3-

Answer:  the oxidation state of N is 3-, that is the option b.

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## In the gas phase, the energy difference between a cesium atom and its most stable ion is referred to as

1) The correct answer is option A.

2) The correct answer is option B.

3) The correct answer is option C.

4) The correct answer is option C.

Explanation:

Alpha Decay, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units.

In Beta-decay, a neutron breaks down into proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.

In Gamma ray emission, an unstable nuclei gives out large amount of energy by a spontaneous electromagnetic process and releases -radiations. These radiations are electrically neutral.

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## Why nucleus is stable? – AnswersMine

Binding energy for a single nucleus is  .

Further Explanation:

The smallest particle that is the building block of matter is known as an atom. Most of the space in an atom is empty and its mass is concentrated inside a small region called the nucleus.

Protons, electrons, and neutrons are the three subatomic particles that are present in the atom. The sum of protons and neutrons are called nucleons because these are located in the nucleus of the atom. Electrons revolve around the nucleus in fixed orbital path. The positively charged subatomic particle is called proton. Neutron is a subatomic particle that is present in nucleus with no charge. Electron is the negatively charged subatomic particle. The number of electrons is equal to the number of protons in a neutral atom.

An atom is written as , where A is the atomic mass or mass number, Z is the atomic number, and X is the letter symbol of the element.

Atomic number (Z) is equal to the number of protons that are present in the nucleus of the atom. Atomic mass (A) is the total number of nucleons that are present within the atomic nucleus of the atom.

The given atom is .

According to the periodic table, Ne has atomic number 10 and mass number 21. We can say that Ne atom has 10 protons and 21 nucleons.

The formula to calculate the number of neutrons is as follows.

……(1)

Substitute10 for numbers of protons and 21 for numbers of nucleons in equation (1).

Mass of 1 proton is 1.0073 amu.

Therefore the mass of 10 protons can be calculated as follows:

Mass of 1 neutron is 1.0087 amu.

Therefore the mass of 11 neutrons can be calculated as follows:

Total mass of nucleons can be calculated as follows:

Mass of Ne nucleus is 21.1687 amu.

The formula to calculate the difference in mass is as follows:

……(1)

Here,  is the mass difference.

Substitute 21.1687 amu for mass of nucleons and 20.98846 amu for mass of Ne nucleus in equation (1).

The conversion factor to convert0.18024 amu mass into kg for a single nucleus is as follows:

The formula to calculate the binding energy is as follows:

……(2)

Here, E is the binding energy of nucleons.

c is the speed of light.

is the mass difference.

Substitute for and for c in equation (1).

Therefore, binding energy for a single nucleus is .

1. Which of the following take place in redox reaction: brainly.com/question/1616320

2. Which of these is an extensive property:brainly.com/question/1398514

Subject: Chemistry

Chapter: Binding energy of nucleons

Keywords: Subatomic particles, atomic number, mass number, proton, neutron, nucleus, nucleons, binding energy, mass difference, 2.6937 J.

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## Which of the following can be accurately said about climax communities? A. Climax communities are always stable. B. Restoration of the original climax community may not always happen. C. Restoration of the original climax community is always achieved at the same rate. D. Climax communities are always uniform.

Pollen is a male gamete, which is produced by the flowers in order to conduct fertilization of female gamete or ovule. The pollen contains proteins which acts as an antigen. When these proteins or antigens are inhaled by the living organisms like humans it creates an allergic response in them. This occurs due to the fact that, when body receives a foreign antigen, the body immune system gets activated and it produces antibodies against it, to expel it out of the body by sneezing.

According to the above information, the culprit is affected by harmless plant proteins, which will originate an allergic response, causing Juan to sneeze when he sniffs the morning glory flower.

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## The Subject is actually Economics. How were ways in which colonial Americans conducted business? In order to establish a stable currency, what dud the Constitution give Congress the power to do?

• What action did President Polk take that resulted in the war between the United States and Mexico?

He sent General Zachary Taylor to claim an area of disputed land for the United States.

Since 1809 the US was, through deals and purchases, trying to expand its own territory; having a lot of success, for example, with the acquisition of Louisiana and Florida. With Mexico it was a little different, they declined many of the substantial offers the US made to them on several occasions.  Not much later, in 1846, President James Polk sent troops to the disputed area, which started the confrontations between the two countries and on March 13 of 1846 President Polk officially declared war on Mexico.

• What was the experience of the Mormons as they traveled from the Midwest, through the South Pass, and into to the Salt Lake Basin?

They had a difficult journey through barren lands.

The Mormons had a very difficult trip, they were attacked repeatedly by mobs, they barely had any food and almost no money at all. People would stop them from staying at many places during their journey, sometimes even the government would get involved in taking them out. A lot of them were actually killed during this journey.

• Which statement best explains the concept of manifest destiny?

The idea that it was God’s plan for the nation to expand across the continent.

Manifest destiny is a concept that is best described as an attitude. It was basically a nationalist attitude even impregnated with feelings of superiority. It was something the pioneers believed during the 1800s. It empowered their expansionist views and it was religious at its core, backing the belief that God had a plan for America to have the pioneers expand across the continent.