Give the ground state electron configuration for sr.

a. [kr]5s25d105p2

b. [kr]5s2 [kr]5s24d10

c. [kr]5s24d105p2

d. [kr]5s24d2

The net force is the sum of all of the forces that cancelled out to zero. Hence, option D is correct.

The pushes or pulls on an object with mass causes it to change its velocity.

The net force is the vector sum of all forces acting on an object. Force is a vector quantity.

Two forces of equal magnitude when acting on an object in opposite directions will cancel out each other.

As a result net force is equal to 0. The word net here shows the total force acting on the object.

Hence, option D is correct.

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What is force?

Hence, option D is correct.

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In Chemistry, we always have to balance the equations, in many topics within the subject of Chemistry, it is required to do that, this is because we have to account for every atom in the reaction, on both sides, reactant and product, the same number of atoms that are on the reactants side must be on the products side. Therefore, the best answer for this question will be letter D

In order to make dry crystals of magnesium, we will take a known volume of hydrochloric acid in a conical flask and add excess insoluble magnesium carbonate. They will react to produce soluble magnesium chloride and carbon dioxide gas.

A crystal or crystalline stable is a stable cloth whose elements (along with atoms, molecules, or ions) are organized in a tremendously ordered microscopic structure, forming a crystal lattice that extends in all instructions.

The concept is that crystals interact with the frame's energy discipline, developing balance and alignment. Many human beings use crystals for strain and cognizance, whilst others agree that crystals have the electricity to heal physical ailments and illnesses.

Take a look at reveals microscopic lifestyles in 830-million-12 months-antique crystal – and it might be alive! A recent study in the magazine Geology finds microorganisms trapped in an 830-million-12 months-antique salt crystal. The researchers say it'd still be alive.

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The 5-step synthesis of the alcohol shown using the reagents provided is: Alkyne → Aldehyde → Protected Aldehyde → Alkene → Primary Alcohol → Alcohol.

To design a 5-step synthesis of the alcohol shown using the reagents provided, we can follow the following steps:

Step 1: Convert the alkyne to an aldehyde using Ozone (O3) followed by Dimethyl Sulfide (CH3)2S. This will yield an aldehyde with a hydroxyl group (-OH) attached to the second carbon.

Step 2: Protect the aldehyde group using Triethyl Orthoformate (C8H20O3) to yield a protected aldehyde.

Step 3: Reduce the triple bond using Sodium Borohydride (NaBH4) to yield an alkene.

Step 4: De-protect the aldehyde using Hydrochloric Acid (HCl) to yield a primary alcohol.

Step 5: Oxidize the primary alcohol using Jones Reagent (CrO3/H2SO4) to yield the desired alcohol.

Therefore, the 5-step synthesis of the alcohol shown using the reagents provided is:

Alkyne → Aldehyde → Protected Aldehyde → Alkene → Primary Alcohol → Alcohol.

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The standard molar enthalpy for the reaction C(s) + ½ O2(g) → CO(g) is -111KJ.

Molar enthalpy is the amount of energy per mole. In light of this, the primary distinction between enthalpy and molar enthalpy is that the former refers to the total heat content of a thermodynamic system, whereas the latter refers to the total heat per mole of reactant in the system.

C(s) + O₂(g) → CO₂(g)    ΔHO = -394 kJ ----(1)

CO₂(g) → CO(g) + 1/2O₂(g)      ΔHO = +283 kJ -----(2)

Adding 1 & 2

C(s) + ½ O₂(g) → CO(g)  

ΔHO = -394 kJ + 283 kJ

ΔHO = -111KJ.

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Complete question is " Find the standard molar enthalpy for the reaction C(s) + ½ 02(g) → CO(g)

Given that

C(s) + O2(g) → CO2(g) AHO = -394 kJ

CO2(g) → CO(g) + ¹/2O2(g) AHO = +283 kJ ".

Answer:

atomic weight..................

Answer:

distance decreases and force increases

Explanation:

When we use a simple machine to do work, the distance decreases, the force increases. Hence, option D is correct. Because, these parameters are in inverse proportion.

Force is an external agent acting on a body to change its motion. There are various kinds of force such as frictional force, magnetic force, gravitational force etc.

Work done is the effectiveness of the machine to use the force to make the maximum displacement. Work done is the product of force and distance.

W = F.ds

As per this relation, the force acting on large distance makes greater work done. However,

F = W/ds.

Hence, as the distance increases, the force is decreasing. Therefore, option D is correct.

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Answer:

3.9 L

First convert temperature to Kelvin

then use the ideal gas law

use algebra to solve for V

Since your solving for volume, your answer should be in Liters.

The degrees of the vibrational freedom does Al₂Cl₆ is 18.

For the vibrational degrees of freedom of the molecule is as :

f = 3N - 6 - L

Where

f  = the number of vibrational degrees of the freedom,

N = the total number of the atoms in the molecule,

L = the number of the constraints or the restrictions

For the aluminum chloride,

N = 2 ( the two aluminum atoms) + 6 ( the six chlorine atoms) = 8.

The molecule has the  D3h symmetry, which will imposes some of the constraints in the vibrational motion of the molecule.

f = 3N - 6 - L

f = 3(8) - 6 - 5

f  = 18

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Answer:

Explanation:

True

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Explanation:

Hope it helps ^•^

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons

In a saturated solution of calcium phosphate with a solubility of 2.21 x 10^{-4} g/L, the molar concentration of the calcium ion (Ca^{+2}) is approximately 7.13 x \(10^{-7}\) M, and the molar concentration of the phosphate ion (PO_{4}^{-3}) is approximately 3.38 x 10^{-7} M.

To determine the molar concentrations of the calcium ion and the phosphate ion in the saturated solution of calcium phosphate, we need to use the given solubility and the molecular weight of calcium phosphate.

The solubility of calcium phosphate is given as 2.21 x10^{-4} g/L. We can convert this to moles per liter by dividing by the molar mass of calcium phosphate (310.18 g/mol):

2.21 x 10^{-4}g/L / 310.18 g/mol = 7.12 x 10^{-7} mol/L

Since calcium phosphate has a 1:1 ratio of calcium ions (\(Ca^{+2}\)) to phosphate ions (PO43-), the molar concentrations of both ions in the saturated solution will be the same. Therefore, the molar concentration of the calcium ion and the phosphate ion is approximately 7.13 x 10^{-7}M.

In conclusion, in a saturated solution of calcium phosphate with a solubility of 2.21 x 1\(10^{-4}\) g/L, the molar concentration of the calcium ion (Ca^{+2}) and the phosphate ion (\(PO_{4}^{-3}\)) is approximately 7.13 x10^{-7} M.

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Option A, chlorofluorocarbons(CFC) react to destroy ozone. This leads to various harmful activities on the earth like global warming.

When gaseous CFCs slowly ascend into the stratosphere, are oxidized by strong UV light, release chlorine atoms, and then interact with ozone molecules, they can weaken the ozone layer. Chlorofluorocarbons (CFC) come into touch with the Ozone layer as they rise upward and toward the stratosphere. As a result, the chlorofluorocarbons(CFC) molecules are split apart by UV light, releasing chlorine atoms that can destroy ozone molecules in a chemical process. The stratospheric ozone protects against ultraviolet rays.

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The reactivity series can help to understand the feasibility of the reaction. As per reactivity series the copper ion is present below hydrogen so the reaction in option d cannot take place.

Reactivity series is a list of metals which are arranged in decreasing order of the reactivity and according to this series, the reaction can be predicted.

As in substitution reaction only those metal can replace the other that is having higher reactivity.

In the given reactions, the reaction between hydrochloric acid and copper cannot take place as copper stands below hydrogen so having less reactivity, due to this it will not be able to displace hydrogen from the reaction.

Thus, the correct option is d.

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Assume that every gas in the list will act perfectly. Using the mole fraction of O2 and the specified pressure, the partial pressure of O2 may be computed (P).

What is specified?

The following diagram illustrates the mathematical link between partial pressure of oxygen (P1) and oxygen mole fraction (X1):

P₁=X₁P

By dividing the total number of moles of gases (0.76 + 0.18 + 0.031 + 0.026) by the number of moles of O2 (0.18 mol), it is possible to determine the mole fraction of O2 as follows:

X₁= 0.18 / (0.76+0.18+0.031+0.026)= 0.1805

In this manner, the partial pressure of O2 (P1) is determined:

P1=0.1805x739mmHg, or 133.4mmHg

According to the estimate above, the partial pressure of oxygen is almost equal to 130 mm Hg. As a result, option C is the best one.

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The correct answer is a) Henry's Law. This law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in the overlying space.

This means that as the partial pressure of the gas increases, more gas molecules will dissolve in the liquid. Henry's Law is important in many areas of science, including chemistry, environmental science, and biology.

For example, it is used to understand the behavior of gases in the atmosphere and their impact on climate change, as well as the ability of aquatic organisms to obtain oxygen from water.

Henry's Law can also be applied to industrial processes such as gas purification and carbonation of beverages.

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         Yes true

I can't come up with a good explanation.

Answer:

The number of atoms is 6.83 grams of potassium is \(1.05\times 10^{23} atoms\).

Explanation:

Mass of the potassium element = 6.83 g

Atomic mass of potassium = 39.10 g/mol

Moles of potassium = \(\frac{6.83 g}{39.10 g/mol}=0.175 mol\)

According to mole concept :

1 mole = \(N_A=6.022\times 10^{23}  \) atoms/ions/ molecules

Total number of atoms of potassium in 0.175 moles:

\(=0.175 \times 6.022\times 10^{23}  =1.05\times 10^{23} atoms\)

So, number of atoms is 6.83 grams of potassium is \(1.05\times 10^{23} atoms\).

Answer:

Scientists learn about the properties of some particles from the collisions that occur inside a particle accelerator.

Explanation:

Answer:

Increases by 10% to £18.15 work out original cost

Answer:

Radium-226 is a radioactive decay product in the uranium-238 decay series and is the precursor of radon-222. Radium-228 is a radioactive decay product in the thorium-232 decay series. Both isotopes give rise to many additional short-lived radionuclides, resulting in a wide spectrum of alpha, beta and gamma radiations.

Answer:

According to Newton's first law of motion, it is the natural tendency of all moving objects to continue in motion in the same direction that they are moving ... unless some form of unbalanced force acts upon the object to deviate its motion from its straight-line path. Moving objects will tend to naturally travel in straight lines; an unbalanced force is only required to cause it to turn. Thus, the presence of an unbalanced force is required for objects to move in circles.

Explanation:

Answer:

Explanation:

Answer:

In 4.56 moles of LiCl 27.46*10^23 formula units is present.    

Explanation:

Formula units is defined as the empirical formula for any ionic, covalent and  network solid compounds which are used as a single unit for stoichiometric calculations. Also It can be defined as the lowest whole number ratio of ions which can be represented in an ionic compound.

We are given

4.65 moles of Lithium chloride.

One mole of Lithium chloride has 6.022*10^23 unit  Formula unit

In 4.56 moles of Lithium Chloride the formula unit will be

              = 4.56*6.022*10^23

Formula units    = 27.46 * 10^23

It is clear that in 4.56 moles of Lithium Chloride will contain 27.46*10^23 Formula unit.

Therefore in 4.56 moles of LiCl 27.46*10^23 formula units is present.    

An increase in entropy (disorder) might make an endothermic reaction spontaneous.

The spontaneity of a reaction is determined by the overall change in free energy (∆G). While endothermic reactions typically require an input of energy, they can still occur spontaneously under certain conditions. If the increase in disorder due to the reaction outweighs the energy input required, the reaction can be spontaneous.

This is because the entropy change (∆S) term in the equation ∆G = ∆H - T∆S becomes more dominant. Therefore, an endothermic reaction can be spontaneous if the increase in disorder compensates for the energy input, allowing the overall change in free energy to be negative.

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answer: bits of rock rusting when exposed to oxygen and water

Explanation: i think because when it rains the water is left and freezes and night making the rock expand or start to Rust

Answer:

A. 140,800 J

Explanation:

Specific heat of a material is defined as the amount of energy required to increase in 1°C 1kg of the material. For wood there are required 1760J perkg per °C.

The equation is:

Q = C*m*ΔT

Where Q is heat in Joules,

C is specific heat (1760J/kg°C),

m is mass (2kg)

ΔT is change in temperature (50°C - 10°C = 40°C)

Replacing:

Q = 1760J/kg°C*2kg*40°C

Q = 140800J

Right option is:

Image Retention is prevented by flooding the imaging plate with bright light after reading.

The term that fills in the blank in the given statement "_______ is prevented by flooding the imaging plate with bright light after reading" is "Image retention.

Image retention is a temporary or sometimes permanent phenomenon that occurs when a picture is left on a screen or other image-generating device for an extended period.

After viewing a fixed picture for a certain amount of time, a faint remnant of the picture may remain visible when the picture is removed, similar to how one can see an after-image after looking at a bright light.

This is often referred to as "ghosting.

Therefore, Image Retention is prevented by flooding the imaging plate with bright light after reading.

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