Consider the H2+ ion. (f) Which of the following statements about part (e) is correct: (i) The light excites an electron from a bonding orbital to an antibonding orbital, (ii) The light excites an electron from an antibonding orbital to a bonding orbital, or (iii) In the excited state there are more bonding electrons than antibonding electrons?

19.9 L

Explanation:

Given:

n = 21 mole, P = 78 atm , T = 900k ,

V = ? , R = 0.0821

Solution:

Ideal gas equation, PV = nRT

                                  V =  nRT / P

                                      = 21 × 0.0821 × 900/ 78

                                       = 19.89 L    

Answer:

An acid

Explanation:

a metal oxide e.g NaOH +an acid e.g HCl=>salt e.g NaCl+water

Answer:

it provides oxygen for the human to breathe

Explanation:

During photosynthesis plants absorbs carbon dioxide from the atmosphere and release oxygen into the air. Hence, it increases the level of oxygen for breath.

Photosynthesis is a biological process by which green plants produce energy and molecular oxygen in leaf by the aid of light energy. The photoactive pigments chlorophyll in green leaves absorbs light energy sufficient for this process.

The photosynthetic reaction involves combination of carbon dioxide and water to form glucose and oxygen as written below:

\(\rm 6H_{2}O + 6CO_{2} \rightarrow C_{6}H_{12}O_{6} + 6O_{2}\).

Therefore, photosynthesis decrease the level of carbon dioxide and increase the level of oxygen in the air . Thus, plant biomass helps us to provide oxygen to breath.

To find more on photosynthesis, refer here:

https://brainly.com/question/1388366

#SPJ5

Answer:

True

Explanation:

Answer:

It is true!

I hope this helps. Have an awesome day <3

Answer:

Dana filtered the sample and larger granules of the sample were left behind.

Explanation:

If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.

One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.

Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.

Answer:

C

Explanation:

Answer:

C

((+_+))((+_+))((+_+))

Answer:

preservation of raw materials

Explanation:

Reusing and recycling is the process by which the used products are used again or recycled in different form to use it again. Excessive use of the raw materials can lead to their extinction. Recycling the materials helps in decreasing the pollution in the environment. It also helps in reduction in the emission of the harmful gases. When municipal wastes are reused or recycled, the raw materials are preserved. These are the process involved in sustainable use of resources.

The correct list that corresponds to the ionization energy of silicon is; 780 kJ, 1575 kJ, 3,220 kJ 4,350 kJ, 16, 100 kJ  

Ionization energy is the energy required to remove electrons from an atom. The number of ionization energies theoretically possible in an atom depends on the number of electrons in the atom.

However, the energy required to remove electrons from a shell in an atom increases progressively.

The second ionization energy is higher than the first ionization energy. The third ionization energy is higher than the second ionization energy and so on.

A final word, the ionization energies for electrons on the valence shell are closer to each other. However, if we go beyond the first shell into the inner shells, there is a sudden tremendous increase in ionization energy.

This jump occurs because more energy is required to remove inner electrons than is required to remove valence electrons.

We see this in silicon, the fourth ionization energy is 4,350 kJ while the fifth ionization energy of silicon is 16, 100 kJ for the reason explained above.

Learn more: https://brainly.com/question/16243729

Compound, according to our last session.

Answer:

Sex cells are different in body cells because the sex cells are eggs while body cells are formed.

Answer:

Carbohydrates

Hope this helps:)

The binding energy of electrons in a metal is 193 kJ mol ^-1 .

The minimal amount of energy needed in physics and chemistry to separate a particle from a system of particles or to break a system of particles down into its component pieces is known as the binding energy.  While the word separation energy is used in nuclear physics, the former meaning is more common in condensed matter physics, atomic physics, and chemistry.

The energy level of a bound system is often lower than that of its unbound components. Relativity theory states that a drop in a system's total energy of E leads to a corresponding decrease in its total mass of m, where

Δmc² = E.

To learn more about binding energy from the given link:

https://brainly.com/question/23020604

#SPJ4

how did u even find me again i wanna see if people are

me with a wey some one made

Answer:ok

Explanation:

The balanced redox reaction is;

H2O2(aq) + 2Fe^2 + (aq) + 2H^+ (aq)→ 2Fe^3 + (aq) + 2H2O(l)

A large number of chemical and biological processes depend on redox reactions. They are essential for energy production, such as during cellular respiration, where ATP is produced as a result of the movement of electrons from one molecule to another. Corrosion, combustion, the creation of chemical compounds, and many other chemical processes all include redox reactions.

Redox processes are normally balanced by making sure that the number of electrons obtained during reduction equals the number of electrons lost during oxidation.

Learn more about redox reaction:https://brainly.com/question/28300253

#SPJ1

Answer:

O by revising the theory that explained atoms to include this new information

by designing new technology that would prove the new information was wrong

Answer:

O by revising the theory that explained atoms to include this new information

by designing new technology that would prove the new information was wrong

Explanation:

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

Learn more about mixture at: https://brainly.com/question/12160179

#SPJ1

Answer:

B

Explanation:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

Malleability, Solubility, and Density are all characteristics that can be observed without changing the identity of the substance. Combustibility, on the other hand, refers to the tendency of a substance to burn as a result of fire or chemical reaction. This means it is a chemical property, because it describes the ability for a substance to undergo a specific chemical change.

Answer:

The answer is the layer of the sun that radiates energy outwards from the sun core

Explanation:

the reason why that is becuase the convection zone is a layers which is unstable to convection. And energy is primarily or partially transported by convection

Answer:

D

Explanation:

Answer:

erm-- how do i answer this question xd

Explanation:

Gaining of an electron is most exothermic for Fluorine.

N2(g)+O2(g)→2NO(g) is an endothermic response because heat is absorbed on this reaction. all of the other reactions are exothermic as the warmth is launched for the duration of the method.

Any manner that absorbs warmness from its environment is an endothermic system. consequently, all endothermic reactions are endothermic strategies. An endothermic reaction is any chemical response that absorbs warmth from its surroundings. The absorbed electricity provides the activation electricity for the reaction to arise.

Fluorine is important for the manufacturing of nuclear material for nuclear power vegetation and for the insulation of electrical towers. Hydrogen fluoride, a compound of fluorine, is used to etch glass. Fluorine, like Teflon, is used to make plastics and is also essential in dental fitness.

Learn more about Fluorine here: https://brainly.com/question/15045637

#SPJ2

Cr can achieve the largest oxidation state of +6.

The oxidation number is a positive or negative number given to an element within a compound or ion.

It represents the degree of oxidation of the atoms of an element.

The oxidation number can be determined using rules such as the oxidation numbers of a monatomic ion being equal to its charge.

Chromium (Cr) in group 6B can achieve the largest oxidation number among the options listed below.

The possible oxidation numbers of chromium are +6, +5, +4, +3, +2, +1, 0, -1, -2, -3, and -4.

Cr can achieve the largest oxidation state of +6.

For example, CrO3 (chromium trioxide) is a stable compound where the oxidation state of Cr is +6.

learn more about oxidation state on

https://brainly.com/question/31688257

#SPJ11

The energy and the wavelength of the photon would be 1.3252  ×10⁻¹⁴ Joules and 150 nanometers respectively.

It can be defined as the number of cycles completed per second.It is represented in hertz and inversely proportional to the wavelength.

C=λν

λ = c / ν

Wavelength = 3×10⁸ /  2.00 x 10¹⁹

                    =1.5  x 10⁻¹¹

                    =150 nanometers

By using the Planck's energy formula,

E = hν

Where h is the Planck's constant with a value of 6.626×10⁻³⁴.

The energy of the Photon = 6.626×10⁻³⁴ ₓ  2.00x 10¹⁹

The energy of the Photon = 6.626×10⁻³⁴ ₓ  2.00 x 10¹⁹

                                            =1.3252  ×10⁻¹⁴ Joules

Thus, the energy and the wavelength of the photon would be 1.3252  ×10⁻¹⁴ Joules and 150 nanometers respectively.

Learn more about frequency here, refer to the link;

brainly.com/question/14316711

#SPJ1

An electrochemical reaction is the flow of electrons between a solid electrode and a substance (electrolyte).

In an electrochemical reaction, electrons are transferred between a solid electrode and a substance, which is typically an electrolyte solution or another electrode.

The reaction takes place at the interface between the electrode and the electrolyte. The solid electrode can be made of a conductive material such as metal, and the substance can be an aqueous or non-aqueous electrolyte solution.

During the electrochemical reaction, oxidation and reduction reactions occur. Oxidation involves the loss of electrons, while reduction involves the gain of electrons.

The electrons flow from the solid electrode (where oxidation occurs) to the substance (where reduction occurs) through an external circuit.

This electron flow generates an electric current, which can be used for various applications such as powering devices or electrolysis. The electrochemical reactions are driven by a potential difference (voltage) between the electrodes, which is often created by a power source such as a battery or a power supply.

Overall, an electrochemical reaction involves the movement of electrons between a solid electrode and a substance (electrolyte), enabling the transfer of charge and the conversion of chemical energy into electrical energy, or vice versa.

Learn more about  electrochemical reaction

brainly.com/question/31236808

#SPJ11

The pH of a 0.350 M solution of NaHCO3 is 6.82.

To find the pH of a 0.350 M solution of NaHCO3, we need to first determine the concentration of HCO3- ions in the solution. NaHCO3 is a salt that dissociates in water to form Na+ and HCO3- ions:

NaHCO3(s) --> Na+(aq) + HCO3-(aq)

The HCO3- ion can act as a weak base and accept a proton from water to form H2CO3, which then dissociates to form H+ and HCO3- ions:

HCO3-(aq) + H2O(l) ⇌ H2CO3(aq) + OH-(aq)

H2CO3(aq) ⇌ H+(aq) + HCO3-(aq)

The equilibrium constant for the second reaction is the acid dissociation constant of H2CO3, which is given by:

Ka = [H+][HCO3-]/[H2CO3]

Since the concentration of H2CO3 is very small, we can assume that it remains constant and ignore it in the equation. We can also write the expression for the base dissociation constant of HCO3-:

Kb = [HCO3-][OH-]/[H2O]

The two constants are related by the equation:

Ka x Kb = Kw = 1.0 x 10^-14

where Kw is the ion product constant of water. From this, we can find the concentration of OH- ions:

Kb = [HCO3-][OH-]/[H2O] = 2.3 x 10^-8

[OH-] = Kb x [H2O]/[HCO3-] = 2.3 x 10^-8 x 1.0 / 0.350 = 6.57 x 10^-8 M

The concentration of H+ ions can be found from the equation:

Kw = [H+][OH-] = 1.0 x 10^-14

[H+] = Kw/[OH-] = 1.0 x 10^-14 / 6.57 x 10^-8 = 1.52 x 10^-7 M

The pH of the solution is given by:

pH = -log[H+] = -log(1.52 x 10^-7) = 6.82

Therefore, the pH of a 0.350 M solution of NaHCO3 is 6.82.

Learn more about pH

brainly.com/question/15289741

#SPJ11

The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

More on waves can be found here: https://brainly.com/question/29334933

#SPJ1

Answer:

13 Neutrons

Explanation:

Answer:

14 neutrons!

Explanation:

The mass number is the total number of protons and neutrons in a nucleus. The atomic number is the number of protons in the nucleus.

So... 27−13=14 neutrons

False, Atoms are not charge-neutral and some have permanent dipole moments(1).False, Molecules are not always charge neutral and can have permanent dipole moments(2).

Both atoms and molecules have some charge because of the electrons.

The atoms themselves have no net charge, but the electrons are negatively charged. In other words, atoms are charge-neutral but their electrons are not.

Furthermore, atoms can have permanent dipole moments as well. For instance, a molecule of HCl has a permanent dipole moment because chlorine has a higher electronegativity than hydrogen, which means that the shared electron pair is drawn closer to the chlorine than to the hydrogen.Molecules can also have a charge imbalance or permanent dipole moment.

When the molecule has an uneven distribution of charge, it becomes polar. A permanent dipole moment exists when the electrons within a covalent bond are not equally shared between the atoms.

To know more about permanent dipole moments visit:

https://brainly.com/question/30474371

#SPJ11

Answer:

= - 303.975 Joules

Explanation:

Given that:

The volume of the cylinder = 0.003 m^3

Now, to liters:

The volume = 0.003 *1000 L

= 3 L

For an open cylinder, we mean the atmospheric pressure is at standard condition.

Thus, the workdone = -PΔV

= - 1 atm (3 L)

= - 3 L atm

1 L atm to Joules

= 101.325 Joules

Therefore;

=- 3* 101.325 Joules

= - 303.975 Joules