Which of the following answers has the element in the correct order for decreasing ionization energy ?
Ca, Ba, Be, Sr
Sr, Ba, Ca, Be
Ba, Sr, Ca, Be
Be, Ca, Sr, Ba

The molar mass of the diprotic acid, H₂X is 84.9 g/mol

We'll begin by calculating the number of mole in 13.96 mL of 0.1051 M NaOH. This can be obtained as follow:

Volume = 13.96 mL = 13.96 / 1000 = 0.01396 L

Molarity of NaOH = 0.1051 M

Mole of NaOH =?

Mole = Molarity x Volume

Mole of NaOH = 0.1051 × 0.01396

H₂X + 2NaOH —> Na₂X + 2H₂O

From the balanced equation above,

2 moles of NaOH reacted with 1 mole of H₂X.

Therefore,

0.00147 mole of NaOH will react with = 0.00147 / 2 = 0.000735 mole of H₂X.

Mole of H₂X = 0.000735 mole

Mass of H₂X = 0.0624 g

Molar mass = mass / mole

Molar mass of H₂X = 0.0624 / 0.000735

Thus, the molar mass of the diprotic acid, H₂X is 84.9 g/mol

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Answer: Less

Explanation:

Ethane is a non-polar molecule while water is a polar molecule

The partial pressure of \(N_2\)is 165.6 kPa and the partial pressure of \(H_2\)is 434.4 kPa.

To calculate the partial pressures of \(H_2\)and \(N_2\)in the 10dmcube container, we need to use the ideal gas law equation, which states that the pressure of a gas is directly proportional to its number of moles and temperature, and inversely proportional to its volume.

First, we need to calculate the number of moles for each gas. Since we are given the volume of each gas and the volume of the container, we can use the formula:

Number of moles = Volume / Molar volume

The molar volume is the volume occupied by one mole of a gas at a given temperature and pressure. At standard temperature and pressure (STP), the molar volume is 22.4 L/mol.

For \(N_2\), the number of moles is 2 dmcube / 22.4 L/mol = 0.089 mol
For \(H_2\), the number of moles is 5 dmcube / 22.4 L/mol = 0.223 mol

Next, we can calculate the partial pressures of each gas using the formula:

Partial pressure = (Number of moles / Total number of moles) * Total pressure

The total pressure is the sum of the pressures of each gas:

Total pressure = Pressure of N2 + Pressure of \(H_2\)

Given that the pressure of N2 is 100 kPa and the pressure of \(H_2\)is 500 kPa, we have:

Total pressure = 100 kPa + 500 kPa = 600 kPa

Now we can calculate the partial pressure of \(N_2\):

Partial pressure of \(N_2\)= (0.089 mol / (0.089 mol + 0.223 mol)) * 600 kPa = 165.6 kPa

Similarly, we can calculate the partial pressure of \(H_2\):

Partial pressure of H2 = (0.223 mol / (0.089 mol + 0.223 mol)) * 600 kPa = 434.4 kPa

Therefore, the partial pressure of \(N_2\)is 165.6 kPa and the partial pressure of \(H_2\)is 434.4 kPa.

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We can actually deduce here that the purpose of this assignment is to teach students about decomposition reactions and allow them to determine the percent yield.

By performing the experiment, students will gain a better understanding of the concepts involved and how they relate to their overall learning.

The specific focus of this assignment is the decomposition of sodium bicarbonate (NaHCO3) to produce sodium carbonate (Na2CO3), water (H2O), and carbon dioxide (CO2). The unbalanced chemical equation for this reaction is:

NaHCO3 (s) + heat -> Na2CO3 (s) + H2O (g) + CO2 (g)

To understanding the reaction itself, students will also learn about the concept of percent yield. Percent yield is a measure of the efficiency of a chemical reaction and is calculated by dividing the actual yield of the desired product by the theoretical yield, then multiplying by 100.

This calculation allows students to assess how well the reaction proceeds in terms of producing the expected amount of sodium carbonate.

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Answer:

will be 9.7 Liters

Explanation:

The weight of a calcium phosphate molecule is 310 amu. Phosphate ion's formula weight is 95 amu.

How can the weight in the formula be determined?

There are 3 calcium molecules, 2 phosphate atoms, and 8 oxygen atoms in calcium phosphate.

The white solids known as calcium phosphates have nutritional value and are present in many living things, such as bone mineral and tooth enamel. Colloidal calcium phosphate (CCP), which is found in milk in micelles bound to casein protein and exists in a colloidal form, is also known as calcium phosphate.

Ca = 3 x 40 = 120 amu

in which P=231=62 amu

for O=8×16=128

So, 310 amu is the total weight.

Phosphate is a

P = 131 = 31 amu

O = 416 = 64 amu

Thus, 95 amu is the total weight.

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The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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Answer:

The compound is largely ionic with A as the cation.

Explanation:

A chemical bond is usually formed between two or more elements. A chemical bond may be ionic, covalent or polar covalent depending on the electro negativity difference between the atoms in the bond.

A large electro negativity difference usually implies an ionic bond. As a rule, when the electronegativity difference is greater than 2.0, the bond is considered ionic.

For the compound A2B, the electro negativity difference between the two atoms is about 2.2. This implies that A2B must be an ionic compound in which A is the cation and B is the anion.

Answer:

One atom of sulfur has a mass of 32.07 AMU; one mole of S atoms has a mass of 32.07 g.

Explanation:

Therefore, the answer should be 32.07 g

Answer:

985.2 moles of nitrogen can produce 1970.4 moles of ammonia.

Explanation:

The balanced chemical equation for the production of ammonia from nitrogen is:

N2 + 3H2 → 2NH3

From the balanced equation, we can see that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia.

So, to determine how many moles of ammonia can be produced from 985.2 moles of nitrogen, we need to use the mole ratio from the balanced chemical equation as follows:

985.2 moles N2 x (2 moles NH3 / 1 mole N2) = 1970.4 moles NH3

Therefore, 985.2 moles of nitrogen can produce 1970.4 moles of ammonia.

Cu + O2 --->  CuO2 -The first reaction is a combustion reaction

2 HCl + Mg → H2 + MgCl2- The second reaction is a Single replacement reaction

A combustion reaction is a type of chemical reaction that occurs between a fuel and an oxidizer in the presence of heat or light, resulting in the release of energy in the form of heat and light.

In other words, it is a reaction in which a substance reacts with oxygen to produce heat and light.

Combustion reactions are important in many aspects of daily life, including the burning of fossil fuels for energy production, the combustion of wood or other materials for heating or cooking, and the combustion of fuels in internal combustion engines.

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The theoretical yield of \(Pl_{3}\) from the given reaction is 73.2 grams.

What is theoretical yield ?

To calculate the theoretical yield of \(Pl_{3}\), we first need to determine which reactant is limiting. We can do this by calculating the amount of product that would be formed from each reactant, and comparing the values.

From the balanced chemical equation, we can see that 2 moles of P reacts with 3 moles of \(I_{2}\) to produce 2 moles of \(Pl_{3}\). So, the number of moles of P and \(I_{2}\) present in the reaction can be calculated as:

moles of P = mass of P / molar mass of P

moles of P = 27.0 g / 30.97 g/mol

moles of P = 0.871 mol

moles of \(I_{2}\) = mass of \(I_{2}\) / molar mass of \(I_{2}\)

moles of \(I_{2}\) = 68.0 g / 253.81 g/mol

moles of \(I_{2}\) = 0.268 mol

Now, we can use the stoichiometry of the balanced chemical equation to calculate the number of moles of \(Pl_{3}\) that can be produced from each reactant:

mol of \(Pl_{3}\) produced from P = (0.871 mol P) / (2 mol P per 2 mol \(Pl_{3}\)) * (2 mol \(Pl_{3}\) / 2 mol P)

mol of \(Pl_{3}\) produced from P = 0.871 mol \(Pl_{3}\)

mol of \(Pl_{3}\) produced from \(I_{2}\) = (0.268 mol \(I_{2}\)) / (3 mol \(I_{2}\) per 2 mol \(Pl_{3}\)) * (2 mol \(Pl_{3}\) / 1 mol \(I_{2}\))

mol of \(Pl_{3}\) produced from \(I_{2}\) = 0.178 mol \(Pl_{3}\)

Since the amount of \(Pl_{3}\) produced is limited by the amount of \(I_{2}\), \(I_{2}\) is the limiting reactant. Therefore, the theoretical yield of \(Pl_{3}\) is the amount of \(Pl_{3}\) that would be produced if all of the limiting reactant (\(I_{2}\)) were completely consumed:

mass of \(Pl_{3}\) = moles of \(Pl_{3}\) * molar mass of \(Pl_{3}\)

mass of \(Pl_{3}\) = 0.178 mol * 411.81 g/mol

mass of \(Pl_{3}\) = 73.2 g

Therefore, the theoretical yield of \(Pl_{3}\) from the given reaction is 73.2 grams.

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Answer:

A or B, but I think B would be the safer option.

Explanation:

In an ecosystem, the following chart of cows depicts cause or effect of the text structure.

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other by means of nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the ecosystem .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems present.

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Yes, I think that it should be more tightly packed than now and it should be made with tight and strong substance which can't be torn easily.

To build a model of liquid water. place your materials on the sheet of the paper. The  difficult about building the model is Connecting the marshmallows with toothpicks.

To build the model of the liquid water. place the materials on the sheet of paper. The regular size of marshmallows can be represent as the larger oxygen atoms, and the other mini marshmallows can be represent as the smaller hydrogen atoms. Then connect the marshmallows with the help of the toothpicks . Then create the total of four molecules.

Thus, the connecting the marshmallow with the help of the tooth picks was difficult about the building the model.

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Answer:

0.16 M

Explanation:

Data provided as per the question is below:-

Volume of \(HNO_3\) = 0.22 L

The Volume of NaOH = 0.18 L

Morality of NaOH = 0.2

According to the given situation, the calculation of the concentration of the \(HNO_3\) is shown below:-

For equivalence,

Number of the equivalent of \(HNO_3\) = Number of equivalents of NaOH

\(= \frac{0.18\times0.2}{0.22}\)

\(= \frac{0.036}{0.22}\)

= 0.16363 M

or

= 0.16 M

Answer:

An azeotrope or a constant boiling point mixture is a mixture of two or more liquids whose...Such a system of solvents is known as a heteroazeotrope. ... that will affect the volatility of one of the azeotrope constituents more than another.

Explanation:

Azeotrope, in chemistry, a mixture of liquids that has a constant boiling point because the vapor has the same composition as the liquid mixture. The boiling point of an azeotropic mixture may be higher or lower than that of any of its components.

Answer:

A. Mo

Explanation:

The given electron configuration: 1s22s22p63s23p64s23d104p65s24d4 shows 42 electrons and Molybdenum has atomic number 42.

But the correct electronic configuration of molybdenum is  [Kr]4d5 5s1, and not [Kr]5s24d4 which is based on the diagonal rule.

The diagonal rule states that a half full 5s subshell and half-full 4d subshell are more stable than a full 5s subshell and 4d filled with four electrons.

Hence, the correct element is "A. Mo".

Answer:

Chemists generally use the mole as the unit for the number of atoms or molecules of a material. One mole (abbreviated mol) is equal to 6.022×1023 molecular entities (Avogadro's number), and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole).\

Have a great day!!!!

Explanation:

1 mole of (NH₄)₂CO₃ has:

Let's consider the chemical formula of ammonium carbonate: (NH₄)₂CO₃.

The subscripts inform us of the number of moles of atoms in 1 mole of molecules.

Nitrogen has 2 subscripts: "1" (which is not written) and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.

\(N: 1 \times 2 = 2\)

Hydrogen has 2 subscripts: "4" and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.

\(H: 4 \times 2 = 8\)

The subscript for carbon is "1".

The subscript for oxygen is "3".

1 mole of (NH₄)₂CO₃ has:

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Answer:

not sure if it's right because there are no choices but most likely a chemical change

When answering questions on the Brainly platform, it is important to always be factually accurate, professional, and friendly. Answers should be concise and not provide extraneous amounts of detail, while also using relevant terms and concepts from the question. Typos and irrelevant parts of the question should be ignored.

The reaction between A and B to form C according to the single-step reaction A + 2B → C. If [B] represents the concentration of B and k is the rate constant of the reaction, then the correct rate equation for [B] and the correct units for the rate constant of the reaction are:[B] = (k [A] [B]) / (1 + k [A])The correct units for the rate constant of this reaction are M-1s-1.According to the rate equation, the rate of the reaction is directly proportional to the concentration of A and B, with a first-order dependence on B and a second-order dependence on A. This means that doubling the concentration of B will double the rate of the reaction, while doubling the concentration of A will quadruple the rate of the reaction. The rate constant k is a measure of how quickly the reaction occurs and is influenced by factors such as temperature, pressure, and the nature of the reactants and catalysts.

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Answer:

These discs absorb the stress and shock the body incurs during movement and prevents the vertebrae from grinding against one another. We can also compare it to glue because basically holds your vertebrates together

Answer:

Explanation:

                                       Answer:

Explanation: stay the same

The chemical reaction is shown by \(CaCl_{2} (aq) + K_{2} CO_{3} (aq) ----- > CaCO_{3}(s) + 2KCl(aq)\). The solvation of the KCl is shown in the image attached.

We know that a reaction is taking place when there is a change in the arrangement of the atoms that surround the reactants and then the products are formed. It is clear that there is a cleavage of the bods that surround the reactants and there is a recombination of these atoms as the products are formed. This recombination of the atoms now takes place in a different way so that we can be able to get new substances at the end of the reaction.

In this case we are looking at the kind of reaction that occurs between potassium carbonate and calcium chloride. One of the reactants is going to separate out of the solution and we would call it the precipitate. The other product is solvated by the water molecules.

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Answer: 2.71%

Explanation:

hey dog.

you confused?

I GOT YOU.

whip out that PERIODIC TABLE MAN THE PERIODIC TABLE WILL SAVE YOUR LIFE ALL DAY! someone will walk up to you all mean and youll be like, "what, you tryna mug me?" WHAM YOU WHIP OUT THAT PERIODIC TABLE AND YOU MESS EM UP! JUST LIKE WE ARE GONNA MESS UP HYDROCHLOROTHIAZIDE RIGHT NOW cuz it thinks its so cool with that name but then we're gonna be like nu-uh we gotcha we are looking for H hydrogen.

look at this bro im gonna look at the C carbon part of the periodic table it looks like this

6

C

12.011

dog... look at that number underneath the letter... what is that? thats ATOMIC MASS bro thats ATOMIC MASS and we are looking for the MASS PERCENTAGE isnt that right? ok.... we are looking for C7H8ClN3O4S2

so we know that 12.011 is carbon so lets multiply (7 x 12.011) because in this compound/substance there are seven carbons. we get 84.077

now lets do the same thing with hydrogen, remember look at the periodic table and we see the mass for hydrogen is 1.008 so multiply that by 8 because theres 8 hydrogens in this compound and we get 8.064

...... do the same for the rest of the elements: chlorine, nitrogen, oxygen, sulfur..... add it all up.... and we get: 297.728 amu (atomic mass units)

ok so now we are looking for mass percentage of H so remember we found that it was 8.064 amu of hydrogen in this compound?

so do this: 8.064 / 297.728

we get 0.027085124... multiply this by 100 because we are looking for PERCENTAGE

and we get 2.708 so round to two decimal places we get 2.71 %

AWESOME SWAG!!!!!!!!!!!

Answer:

LiOH is soluble. Na2CO3 is soluble. Cu(OH)2 is insoluble.

Explanation:

LiOH is soluble. Na2CO3 is soluble. Cu(OH)2 is insoluble.

The general form of a neutralization reaction is HF + FrOH → FrF + H₂O

We refer to this as a neutralisation reaction. Only this reaction, which produces NaCl and water as products, is a neutralisation reaction since it involves HCl and NaOH. The resulting response is listed below: NaCl(aq) + H₂O = HCl(aq) + NaOH(aq) (l)

The interaction of H⁺ ions and OH⁻ ions produces water in a neutralisation reaction, which occurs when an acid and a base combine to make water and a salt. The neutralisation of a strong acid and strong base yields a pH of 7.

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Adding a catalyst will not cause the equilibrium of the reaction to shift towards the products.

A catalyst is a substance that speeds up the rate of a chemical reaction without being consumed in the reaction. It does not affect the position of the equilibrium or the relative amounts of reactants and products at equilibrium.

In the given reaction, Si(s) + 2Cl₂(g) + heat ↔ SiCl₄(g), the forward reaction is exothermic, which means it releases heat. According to Le Chatelier's principle, an increase in temperature will shift the equilibrium towards the reactants side in order to counteract the increase in heat. Therefore, increasing the temperature will shift the equilibrium towards the left, reducing the yield of silicon tetrachloride.

Increasing the pressure of the system will also shift the equilibrium towards the side with fewer gas molecules, which is the products side. In this case, increasing the pressure will shift the equilibrium towards the products, increasing the yield of silicon tetrachloride.

Increasing the mass of both reactants and products by 20% will not affect the position of the equilibrium either, as it does not change the ratio of the concentrations of the reactants and products.

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The volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L (option B).

The volume of a substance can be calculated using the following formula:

P1V1 = P2V2

Where;

153 × 3 = 304 × V2

459 = 304V2

V2 = 459/304

V2 = 1.51L

Therefore, the volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L.

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