The electron-domain geometry of a boron-centered compound BH3 is trigonal planar. The hybridization of the central boron atom is A) sp3d B) sp2 C) sp3d2 D) sp3 E) sp

For sulfur tetrachloride, all six of the valence electrons in sulfur are used in bonds.

Learn more about Valence electrons

https://brainly.com/question/10565851

#SPJ4

Answer:

For example, the atomic radius of the metal zirconium, Zr, (a period-5 transition element) is 155 pm (empirical value) and that of hafnium, Hf, (the corresponding period-6 element) is 159 pm. ... The increase in mass and the unchanged radii lead to a steep increase in density from 6.51 to 13.35 g/cm3.

Explanation:

If the heat capacity of the bomb calorimeter is 9.96 kj/°c, then the amount of heat released from combustion of 2 g of wood is 39.84 kJ.

To determine the amount of heat released from combustion of 2 g of wood, you need to use the formula

Q = C × ΔT Where:Q is the heat released or absorbed in joules (J)C is the heat capacity of the bomb calorimeter (given as 9.96 kJ/°C)ΔT is the change in temperature in degrees Celsius (°C)We can assume that all the heat released from the combustion of the wood is absorbed by the calorimeter, so we can use the heat capacity of the calorimeter to calculate the heat released. Since the calorimeter absorbs the heat, the value of Q will be negative (i.e. the heat is released).

Given: Mass of wood = 2 g Heat capacity of the bomb calorimeter = 9.96 kJ/°C First, we need to calculate the change in temperature. This can be done by measuring the temperature of the calorimeter before and after combustion. Let's assume that the temperature increases by 4.0 °C.ΔT = 4.0 °C Now, we can calculate the heat released: Q = C × ΔTQ = (9.96 kJ/°C) × (4.0 °C)Q = 39.84 kJ

Therefore, the amount of heat released from combustion of 2 g of wood is 39.84 kJ.

More on combustion: https://brainly.com/question/14614499

#SPJ11

There is total a 26 number of valence electrons in a sulfite ion. Thus, option A is the correct answer.

There are total of 26 electrons in the Lewis dot structure of the sulfite ion. the compositions of this number are, there are 6 valence electrons of sulfur.

18 number of valence electrons due to the presence of oxygen, there three atoms each of which six electrons are present. Now, because the sulfite ion is negatively charged, the two electrons presence also counts.

The total number of electrons are two, when we sum up these values we get 26 as it's valence number. While, creating the Lewis dot structure, a double bond is supposed to form between one of the oxygen and sulfur atoms.

There are two single bonds which also gets formed, resulting trigonal planar. In the structure, it is observed that it is arranged in such a way that all the atoms have an octet of valence electrons around them.

to know more about valence electrons,

brainly.com/question/13552988

the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

Answer:

Explanation:help

The functional groups that are involved in forming a peptide bond are the amine group (-NH2) and the carboxyl group (-COOH).

The formation of a peptide bond involves two functional groups: the carboxyl group (-COOH) of one amino acid and the amino group (-NH2) of another amino acid. During the process, a condensation reaction occurs, resulting in the release of a water molecule. The carboxyl group of one amino acid donates a hydrogen atom (H) to the amino group of the adjacent amino acid, creating a peptide bond and forming a dipeptide. This process can continue through multiple amino acids, leading to the formation of longer polypeptide chains. Peptide bonds are crucial for the structural and functional integrity of proteins in living organisms. Proteins, which are made up of one or more polypeptide chains, are the most common type of biomolecules in living organisms.

To know more about dipeptide, visit:

https://brainly.com/question/32240062

#SPJ11

The number of moles of NaCl = 0.103

Given

6 gram sample of NaCl

Required

moles

Solution

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

mole = mass : molar mass

Molar mass of NaCl = 58.5 g/mol

Input the value :

mole = 6 g : 58.5 g/mol

mole = 0.103

Answer:

The gas law that applies in this scenario is Boyle's law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature.

Using Boyle's law equation:

P₁V₁ = P₂V₂

where P₁ is the initial pressure, V₁ is the initial volume, P₂ is the final pressure, and V₂ is the final volume.

Plugging in the given values:

P₁ = 760 mmHg

V₁ = 10 L

V₂ = 20 L

Solving for P₂:

P₂ = P₁V₁/V₂ = 760 mmHg x 10 L / 20 L = 380 mmHg

Therefore, the new gas pressure will be 380 mmHg

By using the combined gas law, which states that the pressure, volume, and temperature of a gas are related by the equation:

P1V1/T1 = P2V2/T2

where:

P1 =initial pressure

V1 =initial volume

P2 and V2 are the final pressure and volume, respectively.

We are given that the initial pressure P1 is 760 mmHg and the initial volume V1 is 10 L. We are asked to find the final pressure P2 when the volume increases to 20 L.

we can rearrange the equation to solve for P2:

P2 = (P1V1/T1) x (T2/V2)

Since the temperature is constant, we can deduce the equation to:

P2 = (P1V1)/V2

Deducing the values we have:

P2 = (760 mmHg x 10 L)/20 L

P2 = 380 mmHg

That implies, the new gas pressure will be 380 mmHg when the volume increases to 20 L.

To know more about Combined gas equation:

https://brainly.com/question/17254541?referrer=searchResults

Barium-131's radiation level won't reach 1/4 of its initial level for 24 hours.

ln[A] t = -kt + ln[A] 0 is the integrated rate rule for the first-order reaction A's products.

A straight line is produced when the natural log of [A] is plotted as a function of time since this equation has the form y = mx + b.

How is the length of a half-life determined?

The amount of time needed for the reactant concentration to drop to half its initial value is known as the half-life of a reaction. A first-order reaction's half-life is a constant that is correlated with its rate constant:

t 1/2 = 0.693/k.

To know more about rate constant, visit:

https://brainly.com/question/20305871

#SPJ4

When natural conditions are present in a free market then, the natural monopoly arises. Dstv is unique and has no other substituents that make them an example of monopoly.

Monopoly is the dominance of a single product, goods, service, business, etc. in the market or the economic sector that excludes the other competitors. They can be the single seller that sells in the business.

DStv is a monopoly in America and includes natural gases, electricity, and communication services. It has no other competitor in the market and has control over others. They are the sole service provider and have no close substitutes.

Learn more about monopoly here:

https://brainly.com/question/27791498

#SPJ1

Explanation:

The law of conservation of mass states that in a closed system, matter can neither be created nor destroyed. This means that the total mass of substances before and after a chemical reaction must remain the same. Therefore, for your given equation of 60g + 40g = 100g, we can see that the law of conservation of mass has been upheld as the total mass before (60g + 40g) and after (100g) the reaction is the same.

Answer:

1. H2O

2. Ba(OH)2

3. H2O

4. H2O

5. Ca(OH)2

6. H2O

Explanation:

Answer:

1. H2O

2. Ba(OH)2

3. H2O

4. H2O

5. Ca(OH)2

6. H2O

Explanation:

Hope this helps

Answer: C2H4 + 3O2  2CO2 + 2H2O

Explanation: Since the exact same amount of atoms is on both sides, no mass or matter is lost which agrees with the law of conservation of mass. This law states that The law of conservation of mass is that, in a closed or isolated system, matter cannot be created or destroyed. It can change forms but is conserved.

Hope this helped!

The percentage composition  of water in a hydrate of BaCl₂ is 14 %.

Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of element/mass of compound ×100.

It provides quantitative information about the compound and helps in it's analysis.

Percent composition helps in elemental analysis in compound .In the given compound, mass= 5 g and mass of anhydrous salt= 4.3 g , mass of water=5-4.3=0.7 g .

Therefore, percent composition is, 0.7/5×100=14 %.

Learn more about percent composition,here:

https://brainly.com/question/17505281

#SPJ1

Answer:

slope = 3

Explanation:

\(slope = \frac{3 - 0}{1 - 0} \\ = 3\)

Answer:

this is the minutes and hours this is representing

When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.

In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.

The chemical equation for the given reaction is:

\(Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Put the necessary stoichiometric coefficient to balance each element.

Balancing Na:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Balancing P:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Balancing S:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Notice that H and O are already balanced.

Hence, the balanced chemical equation for the reaction is:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

where 3 is the stoichiometric coefficient of sulfuric acid, \(H_{2} SO_{4}\).

Learn more about stoichiometric coefficient here: https://brainly.com/question/6666875

#SPJ4

The structure which referred to peroxide is ROOR, ROOH, RCOOOCOR.

All the three structure show peroxide because in all the structure two oxygen atom is connected with single covalent bond.

Peroxides are a class of chemical compounds with the formula R-O-O-R, where R can be any element. The peroxide group, also known as the peroxo group, is the O-O group found in peroxides. The nomenclature varies to some extent. Hydrogen peroxide, also referred to as "peroxide," is the most prevalent peroxide.

Hydrogen peroxide is an antiseptic liquid that is often used to treat cuts or other skin wounds and kill germs. It comes in a brown bottle. However, peroxide is frequently employed in non-medical contexts, such as for stain removal, cleaning, and disinfection.

Learn more about peroxide:

brainly.com/question/29102186

#SPJ4

Answer:

The answer is option A

Explanation:

The question states,'which statement best describes how an ionic bond forms. The correct option is A. Ionic bonds are formed as a result of complete transfer of electrovalence electrons from one atom to another. The atom that donate the electron become a positively charged ion while the atom that received the atom become a negatively charged ion.

Brainliest is greatly appreciated

Answered by: Skylar

6/8/2020

10:05 AM (Eastern Time)

Answer:

A!!!!

Explanation:

Answer: 3.94736842105

Explanation:

Density = mass/volume

Density = 7.5/1.9

Density = 3.94736842105

The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

For more such questions on concentrated visit:

https://brainly.com/question/28564792

#SPJ8

0.20008 kilometers has the most significant figures; option C

Significant figures in calculations or mathematical expressions are the non-zero numbers that occur after or before a decimal point or zero numbers that occur between non-zero numbers.

Significant figures are used in approximations in order to make numbers approximate values.

Considering the given options:

0.000342 grams = 3 significant figures

150 liters = 2 significant figures

0.20008 kilometers = 5 significant figures

1.5 × 104 light years = 2 significant figures

Learn more about  significant figures at: https://brainly.com/question/24491627

#SPJ1

Answer:

0.20008 kilometers

Explanation:

Answer:

Synthesis reaction is 2 or more chemical combing to form  complex product (A+B→AB)

Decomposition occurs when one reactant breaks down into 2 or more products (H2CO3→H2O+CO2)  

Single replacement is a reaction when one element is substituted for another element compound.                                                   (A+BC→ AC+B)

Double replacement occur when parts of 2 ionic compounds are exchanged making two new compounds .(A+B - + C + D- → A+D- +C )

The activation energy of the particular reaction will determines the rate at which it will go. The higher the activation energy gets, the slower the chemical reaction will become.  

Explanation:

A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane because it allows them to survive in and out of the cell.

The cell is surrounded by a membrane called as cell membrane . cell membrane is a semipermeable membrane. semipermeable membrane is the type of membrane which allows solvent particles to pass through it . or some molecules or ion . Therefore , many cells benefited by cell membrane as they can pass through it.

Thus, A cell membrane is more flexible than a brick wall. Why might many cells benefit from a flexible cell membrane because it allows them to survive in and out of the cell.

To learn more about cell membrane here

https://brainly.com/question/17568680

#SPJ1

Approximately 1.01 g of CsOH would need to be dissolved in 500.0 mL of water to produce a solution with a pH of 12.40.

To determine the mass of CsOH needed to produce a solution with a pH of 12.40, we need to use the relationship between pH, pOH, and concentration of hydroxide ions (OH-) in a solution.

First, we can calculate the pOH of the solution using the formula:
pOH = 14 - pH
pOH = 14 - 12.40
pOH = 1.60
Next, we can calculate the concentration of OH- ions using the formula:
pOH = -log[OH-]
1.60 = -log[OH-]
[OH-] = 0.0251 M
Since CsOH dissociates in water to produce one mole of OH- ions for every mole of CsOH, we can use the concentration of OH- ions to calculate the amount of CsOH needed:
0.0251 M CsOH x 0.5000 L = 0.0126 moles CsOH
Finally, we can calculate the mass of CsOH needed using its molar mass:
0.0126 moles CsOH x 80.10 g/mol = 1.01 g CsOH
Therefore, approximately 1.01 g of CsOH would need to be dissolved in 500.0 mL of water to produce a solution with a pH of 12.40.

Learn more about concentration here:

https://brainly.com/question/10725862

#SPJ11

Answer:

the value of water is

6000

Answer:

600 or 6000 I'm not sure

Answer:

A chemical reaction is the change in chemical form rather than physical due to an outside force. This can come from something as simple as a change in temerature to as large as a specific element or compound.