The density of gold is 19.3 g/cm³. What is the mass of 11.3 cm³ of gold?

The electronic configuration is used to explain the orbitals of an atom and it helps to determine the physical and chemical properties of the elements. The electronic configuration of zinc is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰. The correct option is C.

The distribution of electrons in the atomic orbitals is given by the electronic configuration. It is a standard notation in which all the electrons holding atomic subshells are arranged in a sequence. Each element has a unique electronic configuration.

The electronic configuration of an element can be written in two ways, in standard notation, and in condensed form. In the case of elements with larger atomic numbers, the electronic configuration becomes lengthy in standard notation. So in such cases condensed form is generally used.

In condensed form electronic configuration of zinc is [Ar] 3d¹⁰4s² and in standard form it is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰.

Thus the correct option is C.

To know more about electronic configuration, visit;

https://brainly.com/question/19589767

#SPJ7

The smallest angle, measured from the reflecting planes, at which constructive interference of an X-ray beam is observed is approximately 27.2 degrees.

To determine the smallest angle of constructive interference, we can use Bragg's Law, which states that constructive interference occurs when the path difference between two waves is equal to an integer multiple of the wavelength. The formula is given as:

2d sin(θ) = nλ

Where:

d is the distance between the reflecting planes (0.541 nm)

θ is the angle between the incident X-ray beam and the planes (the desired angle)

n is the order of the interference (we are considering the first-order, so n = 1)

λ is the wavelength of the X-ray beam (0.0649 nm)

Rearranging the formula, we get:

sin(θ) = (nλ) / (2d)

θ = arcsin((nλ) / (2d))

Plugging in the values, we have:

θ = arcsin((1 * 0.0649 nm) / (2 * 0.541 nm))

θ ≈ 27.2 degrees

Therefore, the smallest angle at which constructive interference is observed is approximately 27.2 degrees.

To learn more about constructive interference, here

https://brainly.com/question/31857527

#SPJ4

In brief, the pKa of Et2NC(O)CH2NMe3+ (amide) is estimated to be within the range of 9-11. Keep in mind that this is an estimation, and the exact pKa value may vary.                                                                                                                      The pKa of Et2NC(O)CH2NMe3+ (amide) can be found using the following steps:

1. Identify the compound: The given compound is an amide, with the chemical structure Et2NC(O)CH2NMe3+. This is a protonated tertiary amine, where the positive charge is on the nitrogen atom.

2. Determine the acidic site: In this amide, the acidic site is the proton attached to the nitrogen atom.

3. Find pKa values: pKa values are typically found in tables or using online databases. However, since the specific pKa value for this amide is not widely available, you can estimate its pKa based on similar compounds.

4. Estimate pKa: Tertiary amines usually have pKa values around 9-11. For example, the pKa of trimethylamine (NMe3) is approximately 9.8. Since the given amide has a similar structure, you can estimate its pKa to be within this range as well.

Learn more about  acidic site from : brainly.com/question/31592227

#SPJ11

Answer:

A

Explanation:

the nervous system helps parts of the body communicate.through nerves.

I hope this helps

The treatment of an alkene with Br2 and water adds the substituents Br across the double bond to form a halohydrin. This reaction is known as halogenation.

The Br2 molecule is first polarized by the double bond of the alkene, causing the bromine molecule to break apart and form a bromonium ion. The bromonium ion then reacts with water, which acts as a nucleophile, attacking the positive charge of the bromonium ion and displacing one of the bromine atoms. This results in the addition of a bromine atom and a hydroxyl group (OH) across the double bond, forming a halohydrin. In conclusion, the treatment of an alkene with Br2 and water leads to the formation of a halohydrin, with a bromine atom and a hydroxyl group added across the double bond.

To know more about alkene visit:

https://brainly.com/question/30217914

#SPJ11

Answer:

In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy

Explanation:

Answer:

Explanation:

Potassium hydroxide fully ionizes when dissolved in water according to the following equation:

K

O

H

→

K

+

+

O

H

−

Now, let's find the relationship between

K

O

H

and

O

H

−

1

  :  

1

ratio

⇒

[

K

O

H

]

=

[

O

H

−

]

=

6.7

×

10

−

3

M

In any aqueous solution,

[

H

3

O

+

]

and

[

O

H

−

]

must satisfy the following condition:

[

H

3

O

+

]

[

O

H

−

]

=

K

w

[

H

3

O

+

]

=

K

w

[

O

H

−

]

[

H

3

O

+

]

=

1.0

×

10

−

14

6.7

×

10

−

3

[

H

3

O

+

]

=

1.5

×

10

−

12

M

p

H

=

−

log

[

H

3

O

+

]

p

H

=

−

log

[

1.5

×

10

−

12

]

p

H

=

11.83

When the electron in a hydrogen atom changes from the fourth energy state (n=4) to the second energy state (n=2), it results in the emission of a photon with energy equal to the energy difference between the two energy levels.Using the equation:

∆E = E2 - E4The energy change can be found:

∆E = (-3.40 x 10^-19 J) - (-1.51 x 10^-18 J)

∆E = 1.17 x 10^-18 JThe energy of the emitted photon can be expressed as

E = hf, where h is Planck's constant (6.626 x 10^-34 J.s) and f is the frequency of the emitted photon.

The frequency can be found using the equation:f = c/λwhere c is the speed of light (3.00 x 10^8 m/s) and λ is the wavelength of the emitted photon. Substituting values: E = hf

= hc/λ1.17 x 10^-18 J

= (6.626 x 10^-34 J.s)(3.00 x 10^8 m/s)/λλ = 1.63 x 10^-7 mTherefore, the wavelength of the photon emitted is 1.63 x 10^-7 m.

To know more about hydrogen  visit:-

https://brainly.com/question/31018544

#SPJ11

Answer:

Chemical energy.

Explanation:

This is biology btw, not chemistry

The pH is measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution.

In chemistry, pH, traditionally denoting the ability of hydrogen, is a scale used to specify the acidity or basicity of an aqueous answer. Acidic answers are measured to have decreased pH values than basic or alkaline solutions.

The variety goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of extra than 7 shows a base. pH is surely a measure of the relative amount of loose hydrogen and hydroxyl ions inside the water.

To calculate the pH of an aqueous solution you want to recognize the awareness of the hydronium ion in moles in line with liter molarity. The pH has then calculated with the use of the expression: pH = - log [H3O+].

Learn more about pH here:-https://brainly.com/question/479591

#SPJ4

Explanation:

I think the correct answer is B

Hope this helped u

Answer:

D

Explanation:

BEcause you are testing which objects will stick. Your control variable will be the sweater. And the number of times you rub the object on the sweter will not make it stick. It will make it stick for a longer period.

Answer:

D. The type of objects you are testing in the experiment

The statement that "there are many types of energy" is correct. Energy is a fundamental concept in science and refers to the ability of a system to do work or cause a change. There are many different types of energy, each with its own characteristics and properties.

One of the most familiar forms of energy is light energy, which is produced by the sun and other sources of radiation. Sound energy is another form of energy that is produced by vibrations in matter, and it can be detected by the human ear. Thermal energy is the energy associated with the temperature of an object, and it is related to the movement of atoms and molecules within that object.

Chemical energy is stored in the bonds between atoms and molecules, and it is released during chemical reactions. Electrical energy is associated with the movement of electrons through a conductor, and it is used to power many of the devices we use every day. Other forms of energy include nuclear energy, gravitational energy, and kinetic energy.

For more such questions on Energy

https://brainly.com/question/30083274

#SPJ11

Answer:

give me a minute

Explanation:

hope this helped!

if you explain the experimant more i can help you with it

(omg, your in high school, but I'm in middle school but I have this same question lol.)

There would be an advantage for flowers that attract only one type of pollinator and excude others because the flower could be harmed by the pollinator. The flower could have a natural defense against certain species of animals to avoid things like getting completely eaten or getting a virus from an infected species. The disadvantage would be that some species that the flower needs might avoid the flower because of natural defense.

I hope this helps! Sorry if it doesn't because I'm only in middle school.    

If a plant has a specific pollinator, a good relationship evolves between the plant and the insect. If the plant becomes extinct, the plant also becomes extinct.

Pollination is the process by which pollen grains are transferred from the anther to the stigma of a flower. It is normally carried out by the agents of pollination such as wind, insects etc.

If a flower only has a specific pollinator, it is much easier for the plant to be pollinated because the pollinator evolves a good relationship with the plant.

However, if that specific pollinator happens to become extinct, that plant also becomes extinct because there will be no other pollinator for the plant specie.

Learn more about pollination: https://brainly.com/question/1675149

Answer:

C

Explanation:

Answer:

5.55 moles

Explanation:

There is greater orbital overlap between H and X than between H and Y is the correct option according to the given Bond length.

As the average distance between the nuclei of two bonded atoms in a molecule, bond length or bond distance is known. It is a transferable quality of a bond between atoms of fixed kinds that is comparatively independent from the other components of the molecule. The distance between the nuclei of two chemically connected atoms in a molecule is measured as bond length. In relation to the two bound atoms' covalent radii, it is about equal to their sum.

When several orbitals on nearby atoms are concentrated in the same areas of space, it is known as an orbital overlap. Bond formation is facilitated by orbital overlap. Due of space constraints, atomic orbitals overlap. An electron is most likely to be found in an atomic orbital, which is a location in space.

learn more about bond length here

https://brainly.com/question/14924352

#SPJ4

We know the formula

C is concentration and V is volume

The new volume will be by using the relation between molarity and volume formula.

Molarity, also termed as molar concentration in a solution, is a method of determining how much material is present in a chemical solution.

Calculation of volume with the aid of molarity formula is shown below:

Volume is calculated by using the molarity formula.

\(M_{1} V_{1} = M_{2} V_{2}\)

Where, M is molarity and V is volume.

It is given that, \(M_{1}\) = 0.750 M , \(M_{2}\) = 0.500 M, \(V_{1}\) = 275 ml .

Now, put the value of given data in molarity formula.

\(M_{1} V_{1} = M_{2} V_{2}\\V_{2} = M_{1} V_{1} / M_{2}\\V_{2} = (0.750 M) (275 ml) / 0.500 M\\V_{2} = 183.34 ml\)

Therefore, the volume will be 183.34 ml.

To know more about molarity click here.

https://brainly.com/question/2817451.

#SPJ2

Hope it helps you!

-miraculousfanx-

Explanation:

It is given that,

Water flows over Niagara Falls at the average rate of 2,400,000 kg/s

The average height of the falls is 50 m

We need to find the power of Niagara Falls.

The gravitational potential energy of falling water is given by :

P = mgh

Power is rate of doing work i.e.

\(P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{m}{t}\times gh\)

We have, m/t =  2,400,000 kg/s

So,

\(P=2400000\times 9.8\times 50\\\\P=1.176\times 10^9\ W\)

If the number of bulbs are n that could power 15 W LED, the,

\(n=\dfrac{1.176\times 10^9}{15}\\\\n=78400000\ \text{bulbs}\)

Answer: C autotrphic herbivore and eukaryotic

Answer:

Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.

Explanation:

Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.

NH₃, N₂, and H₂ are present in concentrations of 0.00144 mol/L, 6.75 x \(10^{-13}\) mol/L, and 5.08 x \(10^{-2}\) mol/L, correspondingly.

To determine whether the reaction will proceed in the forward or reverse direction, we can calculate the reaction quotient, Q, which is defined as the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.

Q = [N₂] [H₂]³ / [NH₂]²

Plugging in the given concentrations, we get:

Q = (1.0 mol/L)² (1.0 x \(10^{-1}\) mol/L)³ / (1.0 x \(10^{-3}\) mol/L)²

= 1.0 x \(10^{13}\)

Comparing Q to the equilibrium constant K, we see that Q is much larger than K, which means that the reaction will proceed in the reverse direction to reach equilibrium. In other words, some of the N₂ and H₂ will react to form more NH₂ until Q equals K.

To determine the equilibrium concentrations of NH₃, N₂, and H₂, we can use the equilibrium constant expression:

K = [N2] [H2]³ / [NH3]²

Rearranging and solving for [NH₃], we get:

[NH₃]² = [N₂] [H₂]³ / K

[NH₃] = √([N₂] [H₂]³ / K)

Plugging in the given concentrations and K, we get:

[NH₃] = 0.00144 mol/L

Similarly, we can find the equilibrium concentrations of N₂ and H₂:

[N₂] = K [NH₃]² / [H₂]³

= (3.0 x \(10^{-8}\)) (0.00144 mol/L)² / (1.0 x \(10^{-1}\)mol/L)³

= 6.75 x \(10^{-13}\) mol/L

[H₂] = K [NH₃]² / [N₂]

= (3.0 x \(10^{-8}\)) (0.00144 mol/L)² / (6.75 x \(10^{-13}\) mol/L)³

= 5.08 x \(10^{-2}\) mol/L

Therefore, at equilibrium, the concentrations of NH₃, N₂, and H₂ are 0.00144 mol/L, 6.75 x \(10^{-13}\)mol/L, and 5.08 x \(10^{-2}\) mol/L, respectively.

To learn more about concentrations refer to:

brainly.com/question/13872928

#SPJ4

The statement which is true about the subatomic particles within an atom is as follows:

Thus, the correct option is B.

Subatomic particles may be defined as those particles that significantly compose an atom. Such particles are generally smaller than atoms. In other words, it can be said that the subatomic particles are united together to form any atom.

Protons are positively charged subatomic particles that are found in the nucleus of an atom. Electrons are negatively charged subatomic particles that are significantly revolving around the nucleus of an atom.

Neutrons do not have any charge, they are neutral and are found in the nucleus of an atom along with protons.

Therefore, the correct option for this question is B.

To learn more about Subatomic particles, refer to the link:

https://brainly.com/question/16964251

#SPJ2

Answer:

8 atoms.

Explanation:

The pH of a solution made by mixing 35.00 mL of 0.100 M HCl with 30.00 mL of 0.100 M KOH is 2.11

The balanced chemical equation for the reaction between HCl and KOH is:

HCl (aq) + KOH (aq) → KCl (aq) + H2O (l)

The moles of HCl and KOH can be calculated as shown below.

Moles = Molarity×Volume

Number of moles of HCl = (0.100 M) x (35.00 mL / 1000 mL) = 0.00350 mol

Number of moles of KOH = (0.100 M) x (30.00 mL / 1000 mL) = 0.00300 mol

Since HCl and KOH react in a 1:1 ratio, the number of moles of HCl that react with KOH is 0.00300 mol.

The remaining HCl in the solution is 0.00350 mol - 0.00300 mol = 0.00050 mol.

The total volume of the solution can be calculated as shown below.

Total volume of the solution = 35.00 mL + 30.00 mL = 65.00 mL = 0.06500 L

Next, let's calculate the concentration of the remaining HCl:

Concentration of HCl = 0.00050 mol / 0.06500 L = 0.00769 M

Since HCl is a strong acid, it completely dissociates in water, and the concentration of H+ ions in the solution is equal to the concentration of HCl.

The pH of a solution can be calculated as shown below.

pH = -log[H+]

pH = -log(0.00769) = 2.11

Therefore, the pH of the solution is 2.11.

To learn more about pH of a solution:

https://brainly.com/question/7443824

#spj4

Scientists improved Mendeleev’s early periodic table by using atomic number instead of atomic mass to organize the elements. Option C

We know that the periodic table is the arrangement of the elements by the use of a definite sequence. The order of the arrangement of the elements would be determined in a given manner.

In the Mendeleev’s periodic table, the arrangement of the elements was on the basis of the masses of the elements. This method did not produce a consistent pattern for all the elements.

Learn more about the periodic table:https://brainly.com/question/11155928

#SPJ1

Answer:using atomic number instead of atomic mass to organize the elements