substituting certain f atoms in xef4 for other halogens could affect the polarity of the molecule. which of these other molecules could be either nonpolar or polar?

Answer:

A liquid does NOT have a definite shape but has a DEFINITE volume.

Explanation:

If you pour water in a shaped glass or container, it takes that shape of the object. But if you pour water on the table, it will run all aver the place.

Answer:

A. 9.83g

B. 13.06

Explanation:

A) To calculate the mass of BaSO4 formed, you need to first write the balanced equation for the reaction:

Ba(OH)2 + H2SO4 -> BaSO4 + 2H2O

Then, you need to find the limiting reactant, which is the one that runs out first and determines how much product is formed. You can do this by converting the volumes and concentrations of the solutions to moles and comparing them with the stoichiometric coefficients.

50 mL of 1.00 M Ba(OH)2 = 0.050 L x 1.00 mol/L = 0.050 mol Ba(OH)2 88.7 mL of 0.475 M H2SO4 = 0.0887 L x 0.475 mol/L = 0.0421 mol H2SO4

According to the equation, 1 mol of Ba(OH)2 reacts with 1 mol of H2SO4, so Ba(OH)2 is in excess and H2SO4 is the limiting reactant.

Next, you need to use the mole ratio between the limiting reactant and the product to find how many moles of BaSO4 are formed:

0.0421 mol H2SO4 x (1 mol BaSO4 / 1 mol H2SO4) = 0.0421 mol BaSO4

Finally, you need to multiply the moles of BaSO4 by its molar mass to get its mass:

0.0421 mol BaSO4 x 233.39 g/mol = 9.83 g BaSO4

So, the mass of BaSO4 formed is 9.83 g.

B) To calculate the pH of the mixed solution, you need to first find the concentration of OH- ions that remain after the reaction. You can do this by subtracting the moles of OH- that reacted with H+ from the initial moles of OH- and dividing by the total volume of the solution.

The initial moles of OH- are equal to the moles of Ba(OH)2:

0.050 mol Ba(OH)2 x (2 mol OH- / 1 mol Ba(OH)2) = 0.100 mol OH-

The moles of OH- that reacted with H+ are equal to the moles of H2SO4:

0.0421 mol H2SO4 x (2 mol H+ / 1 mol H2SO4) = 0.0842 mol H+

The remaining moles of OH- are:

0.100 mol OH- - 0.0842 mol H+ = 0.0158 mol OH-

The total volume of the solution is:

50 mL + 88.7 mL = 138.7 mL = 0.1387 L

The concentration of OH- is:

0.0158 mol OH- / 0.1387 L = 0.114 M

Next, you need to use the relationship between pH and pOH to find the pH:

pOH = -log[OH-] = -log(0.114) = 0.94 pH + pOH = 14 pH = 14 - pOH = 14 - 0.94 = 13.06

So, the pH of the mixed solution is 13.06.

Based on the IUPAC nomenclature of organic compounds, the name of the molecule is 5-ethyl-3-octenal.

The IUPAC nomenclature is the naming convention adopted by the International Union of Pure and Applied Chemistry.

In the naming of organic compounds, the name is divided into three parts;

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Answer:

proton

Explanation:

Atoms are composed of a nucleus, containing protons and neutrons, surrounded by a cloud of electrons. The number of protons in the nucleus determines the identity of the atom

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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When determining what cation will form during a chemical change, the total number of dots present in the Lewis structure for metals in groups 1, 2, and 13 tells us that these ions will form a positive ion (cation).

Lewis structure are electron-dot diagrams that are used to represent molecules and ions. They help us to predict molecular geometry, bonding properties, and the number of electrons that are shared or transferred during a chemical reaction.

Specifically, it tells us that these ions will form a positive ion (cation).The reason why metals in groups 1, 2, and 13 form cations during a chemical change is due to their electron configuration. These elements have one, two, or three valence electrons, respectively.

As a result, these metals will form a cation with a charge that is equal to the number of electrons they lose. For example, sodium (Na) has one valence electron. When it reacts with another element, it tends to lose this electron, forming a cation with a +1 charge (Na+).

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The average atomic mass of Rubidium : 85.556 u

Isotopes are atoms that have the same atomic number but different mass numbers

Each isotope has an abundance which is usually expressed as a percentage

The average relative mass of atoms is obtained by adding the product of the percentage and mass of each isotope

Can be formulated:

\(\tt Average~Mass~atom~X=mass~isotope~ 1\times \%1+mass~isotope~2\times \%2+..\)

The abundance of ​ 85​ Rb is 72.2% and the abundance of 87​ Rb is 27.8%, so

mass isotope 1=85, %abundance=72.2

mass isotope 2=87, %abundance=27.8

The averages atomic mass of Rubidium :

\(\tt average~atomic~mass=85\times 0.722+87\times 0.278\\\\average~atomic~mass=61.37+24.186\\\\average~atomic~mass=\boxed{\bold{85.556~u}}\)

Answer: The volume of hydrogen sulfide gas is 38.8 L.

Explanation:

The given reaction equation is as follows.

\(Al_{2}S_{3}(s) + 6H_{2}O(l) \rightarrow 3H_{2}S(g) + 2Al(OH)_{3}(aq)\)

Mass of \(Al_{2}S_{3}\) is given as 65.0 g. Hence, moles of \(Al_{2}S_{3}\) (molar mass = 150.158 g/mol) is calculated as follows.

\(Moles = \frac{mass}{molar mass}\\= \frac{65.0 g}{150.158 g/mol}\\= 0.433 mol\)

As 1 moles of \(Al_{2}S_{3}\) is giving 3 moles of \(H_{2}S\). Hence, moles of \(H_{2}S\) formed by 0.433 moles of \(Al_{2}S_{3}\) are as follows.

\(Moles of H_{2}S = 0.433 mol \times \frac{3 mol H_{2}S}{1 mol Al_{2}S_{3}}\\= 1.299 mol\)

Here, pressure is 0.987 atm and temperature is \((90 + 273) K = 368 K\). Therefore, volume of hydrogen sulfide is calculated as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

\(PV = nRT\\0.987 atm \times V = 1.299 mol \times 0.0821 L atm/mol K \times 368 K\\V = 38.8 L\)

Thus, we can conclude that volume of hydrogen sulfide gas is 38.8 L.  

The Sun formed about 4.6 billion years ago in a giant, spinning cloud of gas and dust called the solar nebula. As the nebula collapsed under its own gravity, it spun faster and flattened into a disk.

Answer:

hope it's helpful thanks

Answer:

Increase

Explanation:

More collisions mean more force, so the pressure will increase. When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume.

Answer:

The type of salt to be added to the water is not known from the question but no worries, I will try to give you the step by step procedure to answer any type of question similar to this.

To answer this question, we should know some facts.

1. the molar freezing point depression constant of water (Kf) = 1.86 K kg/mol

2. the molar mass of the salt if NaCl = 58.5 g/mol ; KCl = 74.5 g/mol

3. since the salt can dissociate if NaCl or KCl into two ions, the Van't Hoff factor ( i )= 2

Note that: the change in freezing point, molarity, deepression constant and van't Hoff factor are related by this formula;

                ΔTf = i Kf m

So lets take NaCl as the salt:

Molar mass = 58.5 g/mol

Van't Hoff factor = 2

1. calculate the number of moles

So we can calculate the molarity of the salt NaCl from the formula;

m = ΔTf / i Kf

m = 5 / 2 * 1.86

m = 5 / 3.72

m = 1.344 mol/kg

2. calculate the number of moles of the salt required

Next is to multiply the molarity by the mass of water. Density of water = 1kg/L

number of moles = 1.344 mol/kg * 1 Kg/L * 1 kg water

number of moles = 1.344 moles.

3. calculate the mass of the salt.

numner of moles = mass / molar mass

mass = number of moles * molar mass

mass = 1.344 * 58.5

mass = 78.624 g of NaCl salt.

You can follow these steps to solve for the type of salt you are given in the question.

Answer:

I guess option \(b) \:CCl_4\)  is the correct choice.

Explanation:

Carbon tetrachloride \((CCl_4)\) is a non-polar solvent. Therefore, the non-polar substance will be most soluble in \(CCl_4\).

Best Regards!

To solve this question, you need to use Clapeyron's equation:

P.V = n.R.T

P = pressure generated by the gas on the walls of the container;

V = volume occupied by the gas and can be expressed in liters or cubic meters;

n = number of mol (amount of substance in the gas);

R = general gas constant proposed by Clapeyron and depends on the pressure unit used (in atm, it is 0.082; in mmHg, it is 62.3; in KPa, it is 8.31);

T = temperature at which the gas is subjected (always used in the unit Kelvin).

So we have:

n = 1.13

P = 2.6 atm

V = 18.4 L

T = ?

R = 0.082 atm.L/mol.K

PV = nRT

2.6 x 18.4 = 1.13 x 0.082 x T

47.84 = 0.09266T

T = 516.3 K

Answer: The temperature is 516.3 K

The mass of the cereal that you would need to consume can be obtained as 84.8 g

The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.

Number of moles of sucrose in the cereal = 11g/342 g/mol

= 0.03 moles

Now;

0.03 moles of sucrose is contained in 60 g of cereal

0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles

= 84.8 g

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The molarity of each ion is obtained from the number of moles and volume of solution

From the question, the mass of the solution is 1.00 Kg and the density of the sample is 1.025 g/cm³.

From this, we can calculate the volume of the solution as follows;

D = M/V

V = M/D = 1 × 10^3 g/1.025 g/cm³

V = 976 cm³ or 0.976 L

Recall that number of moles = mass/molar mass

For NaCl = 26.5 g/58.5 g/mol = 0.45 moles

For  MgCl₂ = 2.40 g/95 g/mol = 0.025 moles

For MgSO₄ = 3.35 g/120 g/mol = 0.028 moles

For CaCl₂ = 1.20 g/111 g/mol = 0.011 moles

For KCl = 1.05 g/75 g/mol = 0.014 moles

For NaHCO₃ = 0.315 g/84 g/mol = 0.0038 moles

For NaBr = 0.098 g/103 g/mol = 0.00095 moles

Molarity of each solution = number of moles/volume

For NaCl = 0.45 moles/0.976 L = 0.46 M

For MgCl₂ = 0.025 moles/0.976 L = 0.026 M

For MgSO₄ = 0.028 moles/0.976 L = 0.029 M

For CaCl₂ = 0.011 moles/0.976 L = 0.011 M

For KCl =  0.014 moles/0.976 L = 0.014 M

For NaHCO₃ = 0.0038 moles/0.976 L =0.0039 M

For NaBr = 0.00095 moles/0.976 L = 0.00097 M

The molarity of Na^+ and Cl^- = 0.46 M each

The molarity of Mg^2+ = 0.013 M while the concentration of Cl^- = 0.026 M

The molarity of both Mg^2+ and SO4^2- ions are 0.029 M each

The molarity of Ca^+ is 0.0055 M while the concentration of Cl^- is 0.011 M

The molarity K^+ and Cl^- are both 0.014 M

The molarity of both Na^+ and HCO3^- are both 0.0039 M

The molarity of both Na^+ and Br^- are both 0.00097 M

The total molarity of Na^+ = 0.46 M + 0.0039 M + 0.00097 M = 0.465 M

The total molarity of Ca^+ =  0.0055 M

The total molarity of Mg = 0.013 M + 0.029 M = 0.042 M

The total molarity of K^+ = 0.014 M

The total molarity of Cl^- =  0.46 M + 0.026 M + 0.011 M + 0.014 M = 0.511 M

The total molarity of SO4^- = 0.029 M

The total molarity of HCO3^- = 0.0039 M

The total molarity of Br^- = 0.00097 M

The total molarity of alkali metal ions = 0.465 M + 0.014 M  = 0.479 M

The total molarity of alkaline earth metal ions = 0.0055 M + 0.042 M = 0.0475 M

The total molarity of anions = 0.511 M + 0.029 M + 0.0039 M + 0.00097 M = 0.545 M

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Answer:

The answer it's A. transesterification

From the given graph, it is clear that the element with highest mass ate a volume of 3 cm³is lead and that with least mass is aluminium.

Density of a substance is the measure of its mass per unit volume. Thus, mathematically it is the ratio of mass to the volume. Therefore, as the mass increases density also increase.

Density of an element depends on its mass, volume, temperature and pressure. In periodic table, from left to right density decreases whereas down a group density increases.

From the graph showing the mass-volume-density relation it is clear that the element with with higher mass at a particular volume is lead and the element with least mass among the group is aluminium. The density of these elements also showing the same trend.

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Answer:

All of the above. The CV system transports blood and plasma the do all 4.

If ΔH is positive and entropy decreases, the reaction will be non-spontaneous, which means that it requires energy to proceed. The correct answer is D. Endothermic reaction.

What is an endothermic reaction?

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Answer:

D

Explanation:

The temperature is obtained as  1517 K.

We know that we asked here to find the temperature at which we are going to have a diffusion coefficient of 2.1 × 10−14 m2/s. Let us look at the following from the question;

D = diffusion coefficient = 2.1 × 10−14 m2/s

\(D_{o}\) = pre-exponential constant = 1.1 × 10−5 m2/s

\(E_{a}\) = Activation energy = 253,300 J/mol

R = Gas constant = 8.314 J/mol.K

T = temperature = ??

Then;

log D= log  \(D_{o}\) - Ea/2.303RT

log(2.1 × 10−14) = log( 1.1 × 10−5) - 253,300/2.303 * 8.314 * T

log(2.1 × 10−14) / log( 1.1 × 10−5) = - 253,300/2.303 * 8.314 * T

T = - 253,300/-8.719 * 2.303 * 8.314

T= 1517 K

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Answer:

Store the genetic instructions needed to specify traits.

In DNA, the primary function of chromosome is store the genetic instructions needed to specify traits.

DNA is a hereditary material  which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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Answer:

The correct answer is -2878 kJ/mol.

Explanation:

The reaction that takes place at the time of the oxidation of glucose is,  

C₆H₁₂O₆ (s) + 6O₂ (g) ⇒ 6CO₂ (g) + 6H₂O (l)

The standard free energy change for the oxidation of glucose can be determined by using the formula,  

ΔG°rxn = ∑nΔG°f (products) - ∑nΔG°f (reactants)

The ΔG°f for glucose is -910.56 kJ/mol, for oxygen is 0 kJ/mol, for H2O -237.14 kJ/mol and for CO2 is -394.39 kJ/mol.  

Therefore, ΔG°rxn = 6 (-237.14) + 6 (-394.39) - (-910.56)

ΔG°rxn = -2878 kJ/mol

There are 3.33 moles of \(C_{2}H_{4}\) in the mixture.

The balanced chemical equation for the combustion of methane and ethene is:

\(CH_{4} + 2O_{2} = CO_{2} + 2H_{2}O\\C_{2}H_{4} + 3O_{2} = 2CO_{2} + 2H_{2}O\)

From the equation, we can see that for every mole of \(C_{2}H_{4}\), 3 moles of O2 are needed. Therefore, to burn 10 moles of O2, we need:

10 moles \(O_{2}\)x (1 mole \(C_{2}H_{4}\)/3 moles \(O_{2}\)) = 3.33 moles \(C_{2}H_{4}\)

So, there are 3.33 moles of \(C_{2}H_{4}\) in the mixture.

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Answer:

B. Chemically reactive

Explanation:

A Chemically reactive element is an element that is likely to combine with another element to form new substances

The reactivity of the element depends on the number of electrons in the outermost energy level and even the distance of the outermost energy level from the nucleus.  From the periodic table, Fluorine is the most reactive non-metal while francium is the most chemically reactive metal

Phosphatidylserine is a type of phospholipid that is mainly found in cell membranes. Its structure is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule.

The fatty acid chains are hydrophobic, meaning they repel water, while the phosphate group and serine molecule are hydrophilic, meaning they attract water.

The glycerol molecule acts as a bridge that connects the two fatty acid chains to the phosphate group and serine molecule.
The structure of phosphatidylserine is important for its function in the cell membrane.

Because of the hydrophobic and hydrophilic components of its structure, phosphatidylserine is able to form a lipid bilayer, which is a barrier that separates the inside of the cell from the outside environment.

The hydrophilic heads of the phosphatidylserine molecules face outward and interact with water, while the hydrophobic tails face inward and repel water.
Phosphatidylserine also plays a role in cell signaling and apoptosis, which is programmed cell death.

It acts as a signaling molecule by binding to proteins that are involved in cellular pathways.

In addition, phosphatidylserine is translocated to the outer leaflet of the cell membrane during apoptosis, which signals to immune cells that the cell is ready to be removed.
In conclusion, the structure of phosphatidylserine is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule. Its hydrophobic and hydrophilic components allow it to form a lipid bilayer in cell membranes, and it also plays a role in cell signaling and apoptosis.

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Answer:

Increase

Explanation:

Hope it helps you

Answer:

Decrease

Explanation:

If the oil you're referring to is just some normal oil, it'll lessen the friction and cause it to side more smoothly

The stoichiometry can be used to obtain the parameters about a reaction.

The question is incomplete but I will show you how to use stoichiometry to obtain the parameters that concern a reaction.

Here are the steps to use stoichiometry in a chemical reaction:

Write a balanced chemical equation: The first step is to write a balanced equation for the chemical reaction, which shows the correct number of atoms of each element involved in the reaction.

Determine the molar ratio: From the balanced equation, determine the molar ratio of the reactants and products by counting the number of moles of each species. This will give you the conversion factor between the reactants and products.

Choose a reactant or product to work with: Choose the reactant or product that you have information about, either the amount or the concentration.

Calculate the number of moles: Using the amount or concentration of the reactant or product, calculate the number of moles of that species.

Use the molar ratio to calculate the other species: Using the molar ratio determined in step 2, calculate the number of moles of the other reactants or products.

Convert moles to the desired units: Finally, convert the number of moles to the desired units, such as mass, volume, or number of particles.

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No. Jeremy did not succeed in making the solution more concentrated.

Initially, Jeremy mixed an amount (x) of the cleaner with 4. 0 L of water making a concentration of 1.0 M.

       x/4 = 1.0 M

Thereafter, he added the same amount of (x) of the cleaner and added another 4.0 L of water:

Total amount of cleaner = x + x

                                        = 2x

Total amount of water = 4 + 4

                                      = 8.0 L

Concentration of the resulting solution = 2x/8

                                                               = x/4

x/4 = 1.0 M

Thus the concentration remains the same.

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Answer = 0

Explanation:

The sum of the charges of atoms of elements in a neutral compound is zero

Hence the charge of iron in the compound is 0

The charge on the iron ion in the salt Fe₂O₃ is + 3 as the charge on overall compound is 0.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.

The charge on the iron ion in the salt Fe₂O₃ is calculated as 2×x+3(-2)=0  thus x= +3.

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