describe the process you would go through to find the number of valence electrons for any of the main group (columns 1–8) elements in the periodic table.

Answer:

The correct option is

The gravitational force between them increases

Explanation:

According to Newton's law of universal gravitation states that the force of attraction between two bodies is directly proportional to the product of the masses of the bodies and inversely proportional to the square of the distance of their centers from each other.

The formula for universal gravitation is given as follows;

\(F_{1} = F_{2} =G \times \dfrac{m_{1} \times m_{2}}{r^{2}}\)

Where;

F₁, and F₂ = The gravitational forces of attraction on each mass

G = The gravitational constant

m₁ = The mass of one body

m₂ = The mass of the body

r = The distance between the centers of the two bodies

Therefore, the gravitational force of attraction on each object is inversely proportional to the as the distance between the centers of the two bodies

When the distance between the centers of the two bodies decreases, the two objects are brought closer together, the gravitational force of attraction between them increases.

Answer:

Gravitational force between two objects of masses m1/m2

Explanation:

is defined by Gm1xm2/r^2, where G is a universal constant, and r is the distance between the masses. This shows you why B is wrong; it would increase. Also, A is not a good choice, as shown. In the case of B, it would increase by say, 2/1 to 4/1 by doubling ones mass. In C's case the bottom would decrease on the fraction alot (square) if they were moved closer, thus the force would be greater.

Explanation:

in other words the  answer is The gravitational force between them increases

The coordination number (C.N.) is 6 and oxidation number (O.N.) is +4 of the metal atom.

C.N. = 6; O.N. = +4

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Answer:0 m

3.1 x 10-5 m

0.00031 m

3.1 x 104 m

3,100,000 m

Explanation:

Answer:

I think 4 I got it right on edg but i duno if its the same

Explanation:

The atoms of some elements can be made radioactive by: bombarding them with high energy particles: Choice 3.

Definition:

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Answer

a) Ba

b) Si

c) Zn

Explanation

The presence of unpaired electrons in an atom orbitals indicates paramagnetic properties. When no unpaired electron is observed in an atom orbitals, such an atom possesses diamagnetic properties.

Therefore, atoms in their ground states that are expected to be diamagnetic in the options are:

a) Ba

b) Si

c) Zn

Explanation:

W= F×d

W=29×6

W=174J or 174Nm

The mass (in grams) of 7.5 moles of aluminum hydroxide, Al(OH)₃ is 585 grams

We'll begin by obtaining the molar mass of Al(OH)₃. Details below:

Molar mass of Al(OH)₃ = 27 + 3[16 + 1]

Molar mass of Al(OH)₃ = 27 + 3[17]

Molar mass of Al(OH)₃ = 27 + 51

Molar mass of Al(OH)₃ = 78 g/mol

Finally, we shall determine the mass of 7.5 moles of Al(OH)₃. Details below:

Mole = mass / molar mass

Cross multiply

Mass = Mole × molar mass

Mass of Al(OH)₃ = 7.5 × 78

Mass of Al(OH)₃ = 585 g

Thus, we can conclude that the mass of Al(OH)₃ is 585 g

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Answer:

125 cubic meters

Explanation:

Subtract 375-250=125 cubic meters

Moles are an estimation of the smallest unit of the molecules and the atoms in a sample. The moles of ammonium nitrate in a sample are 0.5010 moles.

Moles are calculated by dividing the mass of the substance in gm by that of the molar mass in gram per mole.  

Given.

Mass of ammonium nitrate = 40.10 gm

The molar mass of ammonium nitrate = 80. 0432 g/mol

Moles of ammonium nitrate are calculated as:

\(\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{40.10}{80.0432}\\\\&= 0.5010 \;\rm mol\end{aligned}\)

Therefore, moles of ammonium nitrate present is option d. 0.5010 moles.

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Answer:

Bile

Explanation:

Bile is secreted by the liver to help in the breaking down of food particles.​

Answer:

Check out libretexts chemistry

Explanation:

It's basically an online free textbook for lots of subjects

highly recommended

Ok , whenever you wanna study chemistry , listen to music that you love. So each time you have to study chem , you will be excited bc u also wanna hear that music u love. Similarly , for every boring work you do , reward yourself for it. It helps , Im sure.

Thank you XD

If the pH of a solution is increased from pH 5 to pH 7, it means that the solution has become more alkaline. The pH scale ranges from 0 to 14, with 7 being neutral, less than 7 being acidic, and greater than 7 being basic or alkaline.

A pH increase from 5 to 7 means that the concentration of hydroxide ions in the solution has increased, leading to a higher level of basicity.

A change in pH can have significant impacts on the chemical and biological systems that the solution interacts with. For example, a change in pH can alter the solubility of certain substances, alter the activity of enzymes, or affect the growth and behavior of microorganisms. It is important to carefully control the pH of solutions in various applications, such as in food and beverage processing, pharmaceutical manufacturing, and environmental management.

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The answer is that the new pressure of the balloon will be 4 atm. This can be calculated using the formula P1 x V1 = P2 x V2, where the initial pressure and volume are 3 atm and 2 L, and the final volume is 1.5 L.

We can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional to each other at a constant temperature. This means that as the volume of the balloon decreases, the pressure will increase.
To calculate the new pressure, we can use the following formula: P1 x V1 = P2 x V2
where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume. Plugging in the values given in the problem, we get: 3 atm x 2 L = P2 x 1.5 L
Solving for P2, we get:  P2 = (3 atm x 2 L) / 1.5 L = 4 atm

We can use Boyle's Law to find the new pressure when the volume of the balloon decreases from 2 liters to 1.5 liters. Boyle's Law states that the pressure and volume of a gas are inversely proportional if the temperature and amount of gas remain constant (P1V1 = P2V2). In this case, the initial pressure (P1) is 3 atm, and the initial volume (V1) is 2 liters. The final volume (V2) is given as 1.5 liters. We want to find the final pressure (P2). Using Boyle's Law, we have P1V1 = P2V2, which means (3 atm)(2 L) = P2(1.5 L). To solve for P2, divide both sides by 1.5 L: (3 atm)(2 L) / (1.5 L) = P2
Now, simplify the equation: (6 atm) / (1.5) = P2
4 atm = P2
Therefore, the new pressure of the balloon when its volume decreases to 1.5 liters is 4 atm.

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The animal bone is approximately 19,028 years old based on the 40% loss of carbon-14.

To determine the age of an animal bone based on the percentage of carbon-14 remaining, we can use the concept of half-life. The half-life of carbon-14 is approximately 5,750 years, which means that after this time, half of the carbon-14 originally present will have decayed.

If the bone has lost 40% of its carbon-14, it means that only 60% of the original carbon-14 remains. We can calculate the number of half-lives that have passed to reach this percentage.

Let's assume the original amount of carbon-14 in the bone was 100 units. After one half-life, 50 units of carbon-14 would remain (50% of the original amount). After two half-lives, 25 units would remain (50% of 50 units). Similarly, after three half-lives, 12.5 units would remain (50% of 25 units).

To find out how many half-lives it took to reach 60%, we can set up the following equation:

12.5 units (remaining amount) = 100 units (original amount) * (1/2) ^ n (number of half-lives)

Solving for n:

12.5 = 100 * (1/2) ^ n

Dividing both sides by 100:

0.125 = (1/2) ^ n

Taking the logarithm of both sides:

log(0.125) = log[(1/2) ^ n]

n * log(1/2) = log(0.125)

n = log(0.125) / log(1/2)

Using a calculator, we can find:

n ≈ 3.3219

Therefore, approximately 3.3219 half-lives have passed.

Since each half-life is approximately 5,750 years, we can calculate the age of the bone:

Age = Number of half-lives * Half-life duration

Age = 3.3219 * 5,750 years

Age ≈ 19,028 years

Thus, the animal bone is approximately 19,028 years old based on the 40% loss of carbon-14.

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Answer:

Option b) polyatomic ions

Explanation:

Polyatomic ions are ions consisting of two or more atoms.

From the question given above, we can see that each ions consist of more than one atom as shown below:

Ions >>>>>> Number of atom present

NH4+ >>>>> 2

CO32− >>>> 2

PO43− >>>> 2

Thus, we can say that the above ions are polyatomic ions.

Answer:

It's C.

Explanation:

Let's see that the first compound represents an oxide which is a combination resulting from the union of a metallic or nonmetallic element with oxygen. To name an oxide, you have to write "___ oxide", where the line is the name of the element. In this case, lithium is the element that is bonded with oxygen, so its name is lithium oxide.

The second compound that you can recognize as water, is an oxide too. So its name is also hydrogen oxide.

Answer:

endothermic

Explanation:

more energy is being released and heat is being required to do the process.

Answer:

887 ML

Explanation:

yup

Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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Answer:

I belive the answer is D

Air within the piston experiences a 490 J shift in internal energy.

The internal energy (U) of a system in thermodynamics is the total energy contained in the system and may be thought of as the sum of the energy in the form of work (w, supplied to or released by the system) and energy in the form of heat (q, given to or released by the system) . This value is positive when the system takes heat from its surroundings, whereas it is negative when it releases heat into its surroundings. When the environment works with the system, there is a positive value; but, when the system works against the environment, there is a negative value.

ΔU = q + w

The negative product of the change in volume (V) and the external pressure (P) is known as w. [w = - P·ΔV]

⇒ ΔU = q - P·ΔV

The cylinder, the piston, and the trapped air make up the system in this puzzle (Attached)

1) q= 565 J (a positive value because the surroundings transferred heat to the cylinder) (a positive value because the environment delivered heat to the cylinder)

2) P = 1 atm.

3) V = 0.86 atm.L - 0.12 atm.L = 0.74 atm.L - q + w - U = 565 J - 1 atm - 0.74 atm.L - U = 565 J - 0.74 atm.L

We must use the same heat unit—the joule—to indicate the work value. In light of the fact that one joule is =  0.00987 atm.L, 0.74 atm.L x (1 J/0.00987 atm.L) = 74.97 J. U = q + w U = 565 J - 74.97 J U = 490 J.

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A "suspension" is an unstable physical mixture of undissolved particles in a liquid. A suspension is a type of mixture where small, solid particles are dispersed throughout a liquid, but they are not dissolved in the liquid.

These particles will eventually settle to the bottom of the container if left undisturbed, as they are not stable enough to remain suspended for long periods of time. Examples of suspensions include muddy water, blood, and paint. Suspensions can also be seen in pharmaceuticals, where active ingredients are suspended in a liquid medium for easier consumption.

It's important to note that suspensions can be distinguished from solutions, where the particles are fully dissolved in the liquid and do not settle over time. While suspensions may not be as desirable in some applications due to their instability, they can be useful in others, such as in providing targeted drug delivery to specific areas of the body.

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⁹⁴Pu₂₄₄-------> ⁹⁵Am₂₄₃ + electron is a nuclear equation for plutonium emitting gamma radiation

Alpha particles plutonium is created in an activator when uranium atoms absorb neutrons. Nearly all plutonium is man-made. Plutonium mainly emits alpha particle is a type of radiation that is easily ceased and has a short range. It also emits neutrons, beta particles, and gamma rays. It also emits neutrons, beta particles, and gamma rays.

It is contemplated toxic, in part, because if it were to be inhaled it could deposit in the lungs and finally cause damage. There are five common isotopes of plutonium because it emits alpha particles, plutonium is most menacing when inhaled.

So we can conclude that Plutonium isotopes emit alpha rays except for plutonium-241 for which the energy of beta electrons is curiously low.

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NO3 is a form of nitrogen that can be utilized by plants.

What is an NO3?

The chemical formula for the polyatomic ion nitrate is NO3. The word "nitrates" refers to salts that include this ion. Many fertilizers and explosives have nitrates as a component. Water can dissolve almost all inorganic nitrates.

What is an nitrogen?

In Group 15 [Va] of the periodic table, nitrogen (N) is a nonmetallic element. The most prevalent element in the atmosphere of Earth is this colorless, flavorless, and odorless gas, which is also a component of all living things  nitrogen.

Therefore, NO3 is correct answer.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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The equation for an alkaline battery is Zn + MnO2 + H2O → Zn(OH)2 + Mn2O3.

Zn: 25.0 g; MnO2: 30.0 g

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The mass of 8.83x10^23 formula units of iron oxide can be calculated using the molar mass of iron oxide.

The molar mass of iron oxide is 159.69 g/mol.

Therefore, the mass of 8.83x10^23 formula units of iron oxide can be calculated by multiplying the molar mass by the number of formula units: Mass = 8.83x10^23  formula units x 159.69 g/mol Mass = 1.41x10^26 g

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