This is how osmium appears in the periodic table. Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium?
76
114
190
266

Answer: Elements in the same row have the same number of occupied energy levels. For each column, the last occupied energy level has the same number of electrons.

Explanation: Straight from PLATO.

On comparing the elements we can say that:

B. Elements in the same row have the same number of occupied energy levels.

In the periodic table, elements are arranged in an order of increasing atomic number. It comprises of seven periods and eighteen groups.

The elements present in the same row or in the same period will have equal number of energy levels or shells.

Thus, option B is correct.

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The amount of joules required to change 25.02g of liquid Ethanol is 3838.2 J or 3.83kJ.

Given,

mass of the ethanol (m) = 25.02g

heat capacity of the ethanol (c) = 2.46

Conversion of Kelvin to Celsius:

C = K - 273.15

C1 = 289.14 - 273.15 => 15.99 C

C2 = 351.5 - 273.15 => 78.35 C

Formula:

H = mcdT                

temperature change (dT) = C2 -C1 => 78.35 - 15.99 => 62.36 C

Substituting the values,

H = 25.02 * 2.46 * 32.36

H = 3838.2 J or 3.83kJ

Therefore, the amount of joules required to change 25.02g of liquid Ethanol is 3838.2 J or 3.83kJ.

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The volume of the liquid should be recorded as 36.5 mL.

When taking a reading from a graduated cylinder, the lower meniscus of convex shape liquid is normally read, instead of the upper meniscus for concave-shaped liquids.

Now, looking at the graduation on the cylinder. Each major scale division is 5mL while each minor division is 1 mL.

The meniscus of the liquid is convex, most likely water. Thus, the lower meniscus is read. The lower meniscus lies in between two minor divisions.

The major division reads 35 mL. The minor division is 1 ml. The lower meniscus reads 0.5 mL

35 + 1 + 0.5 = 36.5 mL

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Explanation:

Hi,

The number of protons is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons. So, in this case, you have 72 protons and 72 electrons.

I hope this helps :)

If an element has the atomic number 72, then the number of protons is also equal to 72. As it is clearly mentioned in the question that it is a neutral atom, which means the number of protons is equal to the number of electrons which is also 72.

An atomic number may be defined as the number of a chemical element in the modern periodic table through which the elements are systematically arranged in order of increasing the number of protons in the nucleus.

According to the context of this question, the atomic number of every element is always equal to the number of protons it has. While in a neutral atom, the number of electrons is equal to the number of protons. For calculating the number of neutrons, you have to subtract the atomic number from the atomic mass.

Therefore, there are 72 protons of an element whose atomic number is 72. The number of electrons is also 72.

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Answer:

The energy of a ruby laser that produces red light with a wavelength of 5.00 × 10^-7 m is 3.98 × 10^-19 J.

Explanation:

The energy of a photon is given by the formula E = hf where h is Planck’s constant and f is the frequency of the photon. The frequency of the photon can be calculated using the formula f = c/λ where c is the speed of light and λ is the wavelength of the photon.

Substituting the given values, we get:

f = c/λ = 3.00 × 10^8 m/s / 5.00 × 10^-7 m = 6.00 × 10^14 Hz

E = hf = (6.626 × 10^-34 J s) × (6.00 × 10^14 Hz) = 3.98 × 10^-19 J

Therefore, the energy of a ruby laser that produces red light with a wavelength of 5.00 × 10^-7 m is 3.98 × 10^-19 J.

Hello again!! :)

Answer:

The new estimates suggest that atmospheric oxygen levels have fallen by 0.7 percent over the past 800,000 years. The scientists concluded that oxygen sinks processes that removed oxygen from the air were about 1.7 percent larger than oxygen sources during this time.

Hope it helps:D

Answer:

The one on the top,'' As the water cool, it is returned to the boiler where it is heated,''

Explanation:

Answer:

Krypton.

Explanation:

By Graham's Law:

Rate 1 / Rate 2 = sqrt M2 / sqrt M1

Molecular Mass for Neon  is 20.18

so we have:

38 / 77.5  =  sqrt 20.18 / sqrt x    where x is the unkown gas.

sqrt x = 9.162

x = 83.94.

This gas is Krypton.

A sample of neon effuses from a container in 38 s. The same amount of an unknown noble gas requires 77.5 s. The unknown gas is krypton.

The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odorless, and colorless gases with relatively little chemical reactivity under normal conditions. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature.

Due to their filled valence shells (octets), which render them incredibly nonreactive, the noble gases (Group 18), which are found in the far right of the periodic table, were formerly known as the "inert gases."

Due to their fully filled outer electron shells and lack of propensity to react with other elements, noble gases which are most frequently found as monatomic gases rarely form compounds with other elements.

By Graham's Law ;

Rate 1 ÷ Rate 2 = sqrt M2 ÷ sqrt M1

The Molecular Mass for Neon  is 20.18

Then,

38 ÷ 77.5  =  sqrt 20.18 / sqrt x    

where x is the unknown gas.

sqrt x = 9.162

x = 83.94.

This is Krypton gas.

Thus, The unknown gas is krypton which is noble gas.

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Answer:

X: Captive Breeding

Y: Habitat Preservation

Explanation:

Answer:its d

Explanation:

uhhh its d

Answer: 4 moles of ammonia.

Explanation:

So you’re trying to make NH 3

 from N 2

 and H 2

.

In chemistry, that is denoted by the following reaction:

N 2

 + H 2

 → NH 3

But you can’t create or destroy atoms, so you need to have the same number of both of them on the same side.

You have 2 hydrogen atoms on the left and 3 on the right. How can we make both amounts the same? If we try to make 2 NH 3

 molecules instead of 1, we have 6 hydrogen atoms in total. 6/2 =3 H 2

 . This also means we have 2 nitrogen atoms, so we have balanced the equation.

N 2

 + 3 H 2

 → 2 NH 3

Now comes the fun part. Those numbers in front of the different formulas are the amount of moles that go into the equation. You need 1 mole of nitrogen and 3 moles of hydrogen to make 2 moles of ammonia. If we multiply these numbers by 2, we can also say you need 2 moles of nitrogen and 6 moles of hydrogen to make 4 moles of ammonia. (And you’d have 1 mole of nitrogen left over.)

Answer:

the newest strategy on get hurt a nuclear warhead we store any chemical agents is to actually dispose of them area of water lighten them off where there is no land animals or any other living breathing animals mammals plantations therefore the correct waste should be disposed of properly by either nuking it in like a loner thing when we burn bodies or in an isolated area where it cannot harm fellow American people animals tree life they should be disposed of properly properly by scientists that have corrected it and know how to break it down there for non giving harmful bacteria land my phone is going to die over Zone and taking away our atmosphere

The statement is False

If the weather station is completely filled in, the sky is considered to have 8/8 cloud cover or 80/100 cloud cover, indicating that the entire sky is covered in clouds.

The small flag indicating wind direction on a station weather plot points in the direction from which the wind is coming. This convention is followed to ensure consistency and to avoid confusion. By pointing in the direction from which the wind is coming, it allows observers to easily understand the wind's direction relative to the station's location.

The amount of the sky covered in clouds can be determined by using a system called the cloud cover code, which is represented in eighths or octas. Each octa represents one-eighth of the sky. So, if the weather station is completely filled in, it means the sky is completely covered in clouds, which corresponds to eight octas or 8/8 cloud cover.

Cloud cover is often reported in terms of tenths as well. In this case, each tenth represents 1/10th of the sky. To convert from octas to tenths, we multiply the octas by 10. Therefore, if the sky is completely filled in with clouds (8 octas), it would be equivalent to 8/8 or 80/100 cloud cover, which is 80% of the sky covered in clouds.

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Answer:

Explained below

Explanation:

Formula for Ammonia is NH3

Now, Nitrogen has 5 electrons in it's outermost shell while hydrogen has only 1 electron.

Thus means that nitrogen needs three more electrons to add to it's five to complete it's octet shell.

Whereas each hydrogen atom will need one extra electron to complete 2 electrons in it's outermost shell.

As depicted in the image attached, Each atom will now have a complete valence shell since the three

Hydrogen(H) atoms share their electrons thereby forming covalent bonds with one Nitrogen(N) atom.

Answer:

where the wind is going

Explanation:

direction is where something is going hope it helps

Answer: number 4 Where the wind is going

Explanation:hope this helps u

Answer:

have a negative electrical charge of one (-1)

Explanatio

Electrons have an electrical charge of negative one. When you think electron, always think -1

Electron degenerate matter is a state of matter that occurs when electrons in a material are compressed to a high enough density that they obey the laws of quantum mechanics, resulting in a pressure that resists further compression.

This state of matter is typically found in white dwarf stars, where the mass of the star is insufficient to create the gravitational pressure needed for nuclear fusion, but is high enough to compress the material to the point where the electrons become degenerate.

In this state, the electrons have so much kinetic energy that they resist further compression, creating a pressure that supports the white dwarf against the force of gravity. Because of their quantum mechanical behavior, electron degenerate materials are highly resistant to thermal energy, and as a result, white dwarfs can maintain their temperature and luminosity for billions of years.

In addition to white dwarf stars, electron degenerate matter is also found in other astrophysical contexts, such as in the cores of neutron stars and in the crusts of accreting neutron stars. It is also of theoretical interest in condensed matter physics, where it is studied as a way to understand the behavior of electrons in extreme conditions.

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The appearance of the solution may change slightly, depending on the initial color of the solution and the solubility of the products formed.

If 6 M NaOH is added instead of 6 M NH₄OH, the solution would become more basic. NaOH is a stronger base than NH₄OH and therefore would react more strongly with the K₂C₂O₄.

Balanced chemical equation for the reaction between K₂C₂O₄ and NaOH will be;

K₂C₂O₄ + 2NaOH → 2KOH + Na₂C₂O₄ + H₂O

As NaOH is added to the solution, it will react with K₂C₂O₄ forming Na₂C₂O₄, KOH and water. This will result in the production of more hydroxide ions, which will increase the pH of the solution.

However, the increase in pH will be noticeable and the solution may become more cloudy due to the formation of a precipitate of Na₂C₂O₄.

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Based on the lab values provided, the answer would be D. The patient has been immunized against hepatitis B as indicated by the presence of HBsAB.

The absence of HBsAg and HBcAb suggest that the patient has not had a recent or current infection with hepatitis B. It is important to note that these lab values should be interpreted by a health care provider in the context of the patient's medical history and any additional lab or clinical findings.

HBcAb (-) means the patient does not have antibodies for the hepatitis B core antigen, suggesting no past infection. These results suggest that the patient has been immunized against hepatitis B.

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Interpreting these lab values for a 40-year-old patient with the given terms:

HBsAg (-), HBsAB(+), HBcAb(-)

a. the pt had hepatitis
b. the pt has hepatitis
c. the pt should consider immunization
d. the pt has been immunized

Your answer: d. the pt has been immunized.

HBsAg (Hepatitis B surface antigen) is negative, which indicates the patient does not have an active Hepatitis B infection.
HBsAB (Hepatitis B surface antibody) is positive, which suggests that the patient has developed immunity to Hepatitis B, either from previous exposure or immunization.
HBcAb (Hepatitis B core antibody) is negative, which means the patient has never been exposed to Hepatitis B.

Therefore, the interpretation of these lab values suggests that the patient has been immunized against Hepatitis B.

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Answer:

HCl

Explanation:

Dissociation denotes to increase in mols

Vant Hoff factor for dissociation is always Greater than 1

Here the reaction is given by

Answer:

HCl

Explanation:

The vant Hoff factor for dissociation is 2

See

\(\\ \tt{:}\longrightarrow HCl\longrightarrow H^++Cl^-\)

Answer:

muscular jumping leg (helps them escape predators, chase after prey), webbed foot (helps them live in both aquatic and land environments), and they can store poison (that is used to attack or defend) in their glands

Explanation:

:)

Nitrous acid is the chemical name for HNO₂ and it is its systematic name.

Nitric acid has the chemical formula HNO₃. Compared to nitrous acid, it is more potent and stable. This is due to the fact that its conjugate base is more stable than that of nitrous acid. H₂N₂O₂ is the chemical formula for hyponitrous acid. HNO₂ is a wobbly, unstable, and mildly acidic substance. It is sometimes referred to as a nitrogen oxoacid. Its molecular weight is 47 g/mol. HNO₂ has a boiling point of 158°C.

Nitrous acid is commonly produced by acidifying nitrite salt with mineral acid. As a result, nitrous acid is the chemical term or the systematic name for HNO₂.

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Answer:

180.155 g

Explanation:

If the human population continues to increase, it is likely that the demand for freshwater resources will also increase, which could have a significant impact on global water distribution. As more people use freshwater resources for drinking, sanitation, agriculture, and industrial purposes, there may be greater competition for limited water supplies.

One potential consequence of this increased demand could be that some regions experience water scarcity, while others have an abundance of water. This could lead to conflicts over water resources, as countries and communities compete for access to freshwater sources. In addition, as demand for freshwater increases, there may be a greater risk of pollution and degradation of freshwater resources, further exacerbating water scarcity and potentially affecting the health and wellbeing of communities that rely on these resources.

To address these challenges, it will be important to prioritize sustainable water management practices, including water conservation, watershed protection, and water recycling. This may involve investing in infrastructure to improve water distribution and storage, as well as promoting policies that encourage more efficient water use. Additionally, greater cooperation and coordination between countries and communities will be essential to ensure that water resources are shared fairly and sustainably.

Overall, as the human population continues to grow, it will be critical to prioritize the responsible management and conservation of freshwater resources to ensure that they are available to meet the needs of current and future generations.

Answer:

As the human population continues to increase, the demand for freshwater resources will also rise. With more people using water, the global water distribution could be affected in several ways:

Water scarcity: As the demand for water increases, there could be a shortage of freshwater resources, leading to water scarcity in certain regions. This could have a significant impact on agriculture, energy production, and human health.

Water pollution: With more people using water resources, the chances of water pollution could also increase. Pollution can come from various sources, including industrial waste, agricultural runoff, and sewage. The contamination of freshwater resources can affect the availability of safe drinking water.

Conflict over water resources: Water is a precious resource, and as its scarcity increases, there is a risk of conflict over its distribution. This could lead to tensions between countries or even within countries, as people compete for access to freshwater resources.

Increased pressure on water infrastructure: As the demand for water increases, there will be increased pressure on water infrastructure, including dams, pipelines, and treatment plants. This could lead to issues such as inadequate water supply, water leaks, and higher water bills.

To mitigate these potential problems, it is essential to manage water resources sustainably. This includes reducing water waste, promoting water conservation, investing in water infrastructure, and using water resources efficiently. It is also important to prioritize the needs of vulnerable communities and ensure that everyone has access to safe drinking water.

1. The value of the equilibrium constant at 25°C is 2.177

2. The value of ΔGo in kJ at 25 oC for the reaction between the pair:

Sn(s) and Pb2+(aq) to give Pb(s) and Sn2+(aq) is -1.9 kJ.

Once a sufficient length of time has passed, a dynamic chemical system approaches chemical equilibrium, a state in which its composition has no discernible propensity to change further.

A chemical reaction's reaction quotient at chemical equilibrium is what is known as the equilibrium constant of the reaction. For a certain set of reaction conditions, the equilibrium constant is independent of the mixture's initial analytical reactant and product species concentrations.

1. Based on the half-reactions:

Sn(s) → Sn²⁺ + 2e⁻  E° = -(Reduction potential) = 0.14V

Pb²⁺ + 2e⁻ → Pb(s) E° = -0.13V

Sn(s) + Pb²⁺ → Pb(s) + Sn²⁺ E° = 0.14V - 0.13V = 0.01V

Eº cell = 0.0592/n (log K) At 25°C

Where E° cell = 0.01V

n are moles of electrons = 2

K is equilibrium constant

0.01V = 0.0592/2 * (logK)

0.3378 = log K

2.177 = K

Thus, the value of the equilibrium constant at 25°C is 2.177

2.  0: Pb(s) →  Pb²+ (aq) + 2\(\Bar e\)  

E⁰ = 0.13 V

R: Sn2+ (aq) +2ē → Sn (s)  

E⁰ =  -  0.14 V

E⁰ cell  =  0.13 V  -  0.14 V  = 0.01 V

\(& \Delta G^{\circ}=-n F E^{\circ} \text { cee } \\& =-2 \times 96485 \times 0.01 \\& =-1929.7 \\& =-1.9 \times 10^3 \mathrm{~J} \\& \Rightarrow-1.9 \mathrm{~kJ} \\&\end{aligned}$$\)

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Answer:

Gestalt pioneers contribute rich examples of creative thinking and practice in their writings and in their work

Explanation:

Answer:

Neodymium is a naturally occurring element that was first discovered by Austrian chemist Carl Auer von Welsbach in 1885. It was discovered in the mineral cerite, which was found in a mine in the village of Bastnäs, Sweden. Neodymium can also be produced by nuclear reactors or particle accelerators by the process of neutron capture. This isotope of neodymium is highly radioactive and has a very short half-life, making it unsuitable for most practical applications.

When a gas reaches a new equilibrium: q will be less than zero.

During the process that occurs until the gas reaches a new equilibrium, the heat of reaction (q) will be less than zero. This is because when a reaction reaches equilibrium, it is at its lowest energy level, and thus q will be negative. In order for the reaction to reach a new equilibrium, energy must be lost, resulting in a negative q value.

To explain further, think of a reaction as two opposing forces that are trying to achieve equilibrium. On one side, there is a driving force that is trying to move the reaction in one direction, while on the other side, there is an opposing force that is trying to maintain equilibrium.

In order to move the reaction from the initial equilibrium to a new one, the driving force must overcome the opposing force. This causes a decrease in the overall energy of the reaction, resulting in q being less than zero.

In conclusion, when gas reaches a new equilibrium, q will be less than zero because energy must be lost in order for the reaction to reach its new equilibrium.

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