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Which change of state is taking place?
lose together but can slide
ms lose energy, they move
ocked in place because of
em.
gas to solid
gas to liquid
liquid to solid
solid to liquid

Answer:

Bueno al principio pero empeorando con el paso del tiempo.

Explicación:

La calidad del aire es buena al inicio de la pandemia y hay menos infección en el aire pero con el paso del tiempo la infección se propaga a un ritmo más rápido y la calidad del aire se contamina con la infección que infecta a más personas. La pandemia reduce su intensidad cuando la gente sigue las reglas saludables que previenen la propagación de la pandemia en esa localidad por lo que podemos decir que la última semana de pandemia tiene menor número de pacientes.

Answer:

CH4

Explanation:

A= CH4

Answer:

Cl- > Ar > K+

Explanation:

Due to the fact that they have different nuclear charges, it means their radius will be different.

Now, the positive charge (cation) with the greater charge value will possess a smaller radius due to the fact that its electrons will have greater attraction to its nucleus.

So, the lesser the value of the charge, the larger the radius.

In the question, K+ has the highest value of charge and thus the smallest radius while Cl- has the lowest value of charge and thus the largest radius. So the correct order in decreasing size is;

Cl- > Ar > K+

From the data in the question, we obtain the following;

The term Ka is the acid dissociation constant. It shows the extent to which an acid is dissociated in solution. We know that the acids that dissociate completely in solution are called strong acids.

In this case;

\(HCHO_{2}\)(aq)  ⇔ \(CHO_{2} ^-\)(aq)  + \(H^+\)(aq)

Hence;

[\(HCHO_{2}\)] = 0.2 M

[\(CHO_{2} ^-\)] = 0.006 M

[ \(H^+\)] = 0.006 M

Ka = [ \(H^+\)]  * [\(CHO_{2} ^-\)]/[\(HCHO_{2}\)]

Ka = (0.006)^2/(0.2)

Ka = 1.8 * 10^-4

The pH of the solution = -log(0.006) = 2.22

If more \(CHO_{2} ^-\) were added to the solution, the equilibrium position would shift to the left hand side.

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The correct answer is B. H2O; sugar. Photosynthesis involves the transfer of electrons from water (H2O) to sugar (glucose).

Plants and other living things employ a process called photosynthesis to transform light energy into chemical energy that can then be released through cellular respiration to power the organism's activities. The word "photosynthesis," which comes from the Greek words "phs," "light," and "synthesis," "putting together," refers to the process of creating molecules of carbohydrates from carbon dioxide and water that store some of this chemical energy. These molecules include sugars and starches. Photoautotrophs are creatures that perform photosynthesis, including most plants, algae, and cyanobacteria. The majority of the energy required for life on Earth is produced and maintained by photosynthesis.  Photosynthesis is also significantly responsible for producing and maintaining the oxygen concentration of the Earth's atmosphere. Although there are numerous steps involved in photosynthesis in plant leaves, it may be broken down into two phases: the light-dependent reactions and the Calvin cycle.

The thylakoid membrane is the site of the light-dependent processes, which necessitate a constant flow of light energy. This light energy is absorbed by chlorophylls and transformed into chemical energy through the creation of two compounds: ATP, an energy storage molecule, and NADPH, an electron carrier that is reduced. Water molecules are also changed into oxygen gas, which is the oxygen we breathe, throughout this process.

Calvin cycle occurs in the stroma and does not directly require light, commonly known as the light-independent processes. Instead, the Calvin cycle utilises ATP and NADPH from the light-dependent processes to fix carbon dioxide and create molecules of glyceraldehyde-3-phosphate (G3P), a three-carbon sugar that combines with another to generate glucose. The overall result of light-dependent processes is the temporary storage of light energy in the chemical forms of ATP and NADPH. In order to release energy, ATP is broken down, and NADPH contributes its electrons to the process, turning carbon dioxide molecules into sugars. The energy that began as light eventually becomes bound up in the bonds of the sugars.

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The pH of a 1.10 x 1\(0^{-3}\) M solution of phenol (HC6H5O) is 9.89.

To calculate the pH of a solution, you need to know the concentration of the H+ ions in the solution. This can be determined using the following equation:

H+ = [H+]standard x 10-pH

Where [H+]standard is the concentration of H+ ions in a standard solution, which is 1 M in this case. So, rearranging the equation, we get:

pH = -log[H+]standard + log [H+]

Therefore, the pH of a 1.10 x 1\(0^{-3}\) M solution of phenol (HC6H5O) can be calculated as follows

pH = -log (1 M) + log (1.10 x 1\(0^{-3}\)  M)
pH = 9.89

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Answer:

plant cells use sugar to provide energy

hope it helped :)

if it did please mark as brainliest :)

The correct answer is "Convexity has high value when investors expect that market yields will not change much." This statement is incorrect about the convexity term of a bond.

Convexity is the curvature of the price-yield relationship of a bond and a measure of how bond prices react to interest rate shifts.

Convexity is a term used in bond markets to describe the shape of a bond's yield curve as it changes in response to a shift in interest rates.

Bond traders use the convexity term to estimate the effect of interest rate changes on bond prices more precisely.

Bond traders use the term convexity to measure the rate of change of duration, which is a measure of a bond's interest rate sensitivity.

Convexity term and its features Convexity is always positive for a plain-vanilla bond.

We can improve the estimation of a price change with regard to a change in interest rates by accounting for the convexity of the bond.

Convexity is higher when market yields are unstable or when the bond has more extended maturity and lower coupon rates.

Thus, the correct statement about the convexity term of a bond is:

Convexity is higher when market yields are unstable or when the bond has more extended maturity and lower coupon rates.

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Taking into account the definition of net ionic equation, a precipitate of BaSO₄ is formed.

The net ionic equation is a chemical equation for a reaction that lists only the species that participate in the reaction.

In other words, an ionic equation is a chemical equation where electrolytes in aqueous solution are written as dissociated ions. Usually this is a salt dissolved in water.

A spectator ion is an ion that appears both as a reactant and as a product in an ionic equation.

When writing a net ionic equation, spectator ions found in the original equation are ignored. Thus, the total ionic reaction is different from the net chemical reaction.

The balanced equation will be:

Cu₂SO₄ (aq) + BaCl₂ (aq) → 2 CuCl (aq) + BaSO₄ (s)

where (aq) means aqueous and (s) solid.

Taking into account that:

The total ionic equation in separated aqueous solution will be:

2 Cu⁺ (aq) + SO₄²⁻ (aq) + Ba²⁺(aq) + 2 Cl⁻ (aq) → 2 Cu⁺ (aq) + 2 Cl⁻ (aq) + BaSO₄ (s)

Cu⁺ and Cl⁻ are the spectator ions because they appear unchanged in both the product and the reagent. So these ions cancel out. And you get the net ionic equation as follow:

SO₄²⁻ (aq) + Ba²⁺(aq) → BaSO₄ (s)

Finally, a precipitate of BaSO₄ is formed because is an insoluble salt and it will precipitate.

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The theory associated with the 70 Wowirs experiment is the determination of the coefficient of restitution.

The theory associated with the 70 Wowirs experiment is (3) the determination of the coefficient of restitution. The experiment involves colliding two objects on a linear air track and measuring the rebound velocity of one object after the collision. The coefficient of restitution is a measure of the elasticity of the collision and is calculated using the ratio of the rebound velocity to the initial velocity.

This experiment helps determine how much kinetic energy is conserved or lost during the collision, providing insights into the properties of the objects and the nature of the collision.

The 70 Wowirs experiment is a specific experiment that is not widely known or referenced. As a result, there are no details available regarding the specific experiment, its purpose, or its methodology. It is possible that the term "70 Wowirs" may be a misspelling or a specific reference that is not commonly recognized.

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A potassium atom's ground state electron configuration is 1s2, 2s2, 2p6, 3s2, 3p6, 4s1.

An atom's electron configuration is a picture of how electrons are arranged in relation to orbital shells and subshells. Consequently, this is potassium's electron configuration.

Making Electron Configurations in Writing. Write the energy level (the period) first, then the subshell that needs to be filled, and finally the superscript, which indicates how many electrons are in that subshell. The atomic number, Z, is the sum of all the electrons.

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Answer:

Yes aluminum is reactive than copper

Answer: Aluminium is more reactive than Copper.

More in details:

Aluminium is located much above in reactivity series of metal than Copper.So, Aluminium is more reactive than Copper.

Answer:

i guess the answer is..true

the ozone in troposphere protects the earth from ultra violet waves that may cause global warming

The transition between n=1 and n=2 corresponds to the longest wavelength with the lowest frequency.

An electron is said to be "excited" when it is promoted to a higher energy level inside its bound state.

Either the electron absorbs a photon and obtains all of its energy, or it receives energy via a collision with another, energetic electron.

Understanding energy levels :

Therefore the transition between n=1 and n=2 corresponds to the longest wavelength at the lowest frequency.

The higher the frequency of a photon, the higher its energy.

The longer the wavelength of a photon, the lower its energy.

                                  E ∝ 1/λ      [ FOR PHOTON ]

The lowest energy is 1 eV, which corresponds to the transition between the n=1 and n=2 levels.

The longest wavelengths are associated with the lowest energies, so transitions between n=1 correspond to the longest wavelengths.

The term "thermal excitation" refers to the process by which electrons within a semiconductor crystal lattice are elevated to a higher energy band via lattice vibrations. This process, known as electron relaxation, occurs when an excited electron returns to a less energetic state.

As a result, a photon is released into the environment, or energy is transferred to another particle. The amount of energy released is proportional to the gap in potential energy between the electron's lowest and highest states.

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In the acid-base reaction H3O+ + OH- → 2H2O, the H3O+ ion transfers a proton (H+). This is a classic example of a neutralization reaction where the acidic H3O+ ion and the basic OH- ion combine to form water (H2O) molecules. The transfer of a proton from the H3O+ ion to the OH- ion results in the formation of two water molecules, which are neutral in nature.

1. H3O+ (hydronium ion) acts as an acid, while OH- (hydroxide ion) acts as a base.
2. The acid (H3O+) donates a proton (H+) to the base (OH-).
3. OH- accepts the proton (H+) and forms a water molecule (H2O).
4. The reaction results in the formation of 2 water molecules, as shown in the balanced equation: H3O+ + OH- → 2H2O.

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When H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases (option C)

A French scientist (Chatelier) postulated a principle which helps us to understand a chemical system in equilibrium.

The principle states that If a an external constraint such as change in temperature, pressure or concentration is imposed on a system in equilibrium, the equilibrium will shift so as to neutralize the effect.

According to Chatelier's principle a decrease in concentration of the products will favor the forward (right) reaction.

From the above principle, we can conclude that when H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases.

Thus, the correct answer to the question is option C

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Answer:

woodpecker it's easy lil lol

Answer and explanation

The solvent in the graph is water (H2O), water tells us that these substances dissolve at different amount of water, and the dissolvation is different in different temperatures in water. For example, NaCl readily dissolves in water.

In the reaction 4 Cr²⁺(aq) + O₂(g) + 4 H⁺(aq) → 4 Cr³⁺(aq) + 2 H₂O(l), trace amounts of oxygen gas are removed from the mixture. This reaction involves redox processes, where oxidation and reduction occur simultaneously. The correct options are A and B.

A. O₂ (g) is reduced: This statement is true. In the reaction, the oxygen gas (O₂) gains electrons, changing its oxidation state from 0 to -2 (in H₂O). Gaining electrons is the process of reduction.

B. Cr²⁺(aq) is the oxidizing agent: This statement is also true. The oxidizing agent is the substance that causes the reduction of another species. In this case, Cr²⁺ causes the reduction of O₂ by accepting electrons and undergoing a change in its oxidation state from +2 to +3.

C. O₂(g) is the reducing agent: This statement is false. The reducing agent is the substance that causes the oxidation of another species. In this reaction, O₂ is reduced, not the reducing agent. The reducing agent is Cr²⁺, as it loses electrons and causes the oxidation of other species.

D. Electrons are transferred from O₂ to Cr²⁺: This statement is false. Electrons are transferred from Cr²⁺ to O₂. Cr²⁺ loses electrons and gets oxidized to Cr³⁺, while O₂ gains electrons and gets reduced to form H₂O.

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Answer:

! liter is 1000 millimetres so that means 10*1000=10,000 millimetres of fizzy bubble.

Explanation:

Answer:

Answer is 10000 Explanation:

A milliliter is a unit of volume equal to 1/1000th of a liter. It is the same as a cubic centimeter.

The Earth's surface is not covered with the same materials ; however, some areas share similar materials.Several drilling sites have been dug in various regions of the planet to analyze the Earth's surface.

Each drilling site is unique, with differing characteristics and results. Despite these differences, all of the drilling sites analyzed offer scientists a more in-depth knowledge of the Earth's surface.In essence, the scientific drilling sites each had different lithologies, stratigraphies, and geologies. Each site had different types of rocks, depths, and ages, which led to varying drilling conditions, depths, and equipment used. Different types of equipment were also used to reach the depths required, which was a significant difference in each drilling site.The scientific drilling sites also had different purposes. Scientists had specific goals they wanted to achieve at each location. For example, the scientific drilling site in the Iceland region was focused on analyzing a unique layer of igneous rocks. The primary objective was to investigate the formation of the rock layer.The same materials were not found at each scientific drilling site.

Still, they had some similarities. They all provided geologists with vital information about the Earth's surface. The data provided from each drilling site was used to piece together the Earth's geologic history and how it has changed over time.

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The ionization energy of 369kj were required for the removal of the outermost electron.

How do you determine the energy required to remove one electron?

Energy of Ionization

Ionization energy (IE) is the amount of energy necessary to remove an electron from a neutral atom or cation in its gaseous state. IE is also known as ionisation potential.

Calculate the energy necessary to remove an electron

E(k) = 1/2 mv is used to calculate the electron's kinetic energy.

2. Kinetic energy of an electron + work function of sodium (per atom) Equals energy of an incoming photon.

The ionization energy of 369kj were required for the removal of the outermost electron.

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9× 10^15 Hz and this frequency belongs to the Ultraviolet rays having a wavelength of 3.33x10-8 m

Velocity= frequency× wavelength

frequency= Velocity/ wavelength

frequency= 3*10^8/ 3.33 * 10^-8

frequency= 0.9* 10^16

frequency= 9* 10^15 Hz

Frequency in physics refers to both the number of cycles or vibrations that a body in periodic motion experiences in a unit of time as well as the number of waves that pass in a unit time. When a body in periodic motion moves through a series of events or positions and then returns to its initial state, it is said to have completed one cycle or one vibration. The frequency is the reciprocal of the period, or time interval; in other words, frequency = 1/period = 1. (time interval).

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Answer:2097.5998675091255

Explanation:

Due to the absence of a reactive carbonyl group, carboxylic acids do not form phenyl hydrazones when treated with phenyl hydrazine.

Phenyl hydrazone formation typically occurs when an aldehyde or ketone reacts with phenyl hydrazine. In this reaction, the carbonyl group (C=O) of the aldehyde or ketone undergoes a nucleophilic addition with the hydrazine group (-NHNH2) of phenyl hydrazine, resulting in the formation of a hydrazone.

However, carboxylic acids do not possess a reactive carbonyl group like aldehydes or ketones. Instead, carboxylic acids contain a carboxyl group (COOH) which is not susceptible to nucleophilic addition by phenyl hydrazine. The carboxylic acid group is more acidic in nature and does not participate in hydrazone formation.

Due to the absence of a reactive carbonyl group, carboxylic acids do not form phenyl hydrazones when treated with phenyl hydrazine. It is important to note that the reaction conditions and reagents should be carefully chosen to match the desired chemical transformation.

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Answer:

I think carbon.

Explanation:

............

0.049 atm is the Osmotic pressure. It is a measure of the concentration of a solution and its ability to move through a semipermeable membrane.

At 20 degrees C, the osmotic pressure of a 0.010M solution of C12H22O11 (aq) is calculated as follows:
Osmotic pressure = Molarity x gas constant x temperature
Osmotic pressure = 0.010 mol/L x 0.0821 L atm/mol K x 293 K
Osmotic pressure = 0.024 atm

For a 1.0M HCl (aq) solution, the osmotic pressure is calculated as follows:
Osmotic pressure = Molarity x gas constant x temperature
Osmotic pressure = 1.0 mol/L x 0.0821 L atm/mol K x 293 K
Osmotic pressure = 24.1 atm

Lastly, for a 0.010M CaCl2 (aq) solution, we assume complete dissociation of the CaCl2 into Ca2+ and 2Cl- ions. Therefore, the total concentration of ions is 0.020M (2 x 0.010M). The osmotic pressure is calculated as follows:
Osmotic pressure = Molarity x gas constant x temperature
Osmotic pressure = 0.020 mol/L x 0.0821 L atm/mol K x 293 K
Osmotic pressure = 0.049 atm

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True. The statement "Bohr's quantization of angular momentum for the electron in the hydrogen atom can be derived from de Broglie's wave properties for the bound electron" is true.

The statement "Bohr's quantization of angular momentum for the electron in the hydrogen atom can be derived from de Broglie's wave properties for the bound electron" is true. The quantization of angular momentum in the hydrogen atom was one of the most crucial contributions of the Bohr model. This was derived by using the de Broglie wavelength relationship between particles and waves.In Bohr's model, electrons orbit around the nucleus and experience centripetal force.

Bohr assumed that the angular momentum of the electron is quantized, which means that it can only take discrete values that are multiples of Planck's constant divided by 2π. This is expressed as:L = n\hbar where L is the angular momentum, n is a positive integer called the principal quantum number, and ℏ is Planck's constant divided by 2π.The de Broglie relation states that particles can behave like waves.

It establishes a relation between the momentum of a particle and the wavelength of its associated wave as:{\lambda}=\frac{h}{p}where λ is the wavelength, p is the momentum, and h is Planck's constant. Applying this relation to the electron in Bohr's model, we have:p=\frac{mv}{r} where m is the mass, v is the velocity of the electron, and r is the radius of its orbit.

Substituting the expression for momentum in the de Broglie relation, we obtain:{\lambda}=\frac{h}{mv}. This wavelength is related to the circumference of the orbit as:2\pi r = n\lambda where n is the same integer that appears in the expression for the angular momentum of the electron. Substituting the expression for λ in terms of h/mv and simplifying, we obtain Bohr's expression for the angular momentum of the electron, which is precisely quantized:L=\frac{nh}{2\pi}.

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Answer:

One reaction that can be used to show the difference between a weak acid and a strong acid is the reaction with magnesium. When magnesium is added to hydrochloric acid, a vigorous reaction occurs, releasing hydrogen gas and forming magnesium chloride:

2HCl(aq) + Mg(s) → MgCl2(aq) + H2(g)

In contrast, when magnesium is added to ethanoic acid, a slow reaction occurs, releasing hydrogen gas and forming magnesium ethanoate:

2CH3COOH(aq) + Mg(s) → Mg(CH3COO)2(aq) + H2(g)

The reason for the difference in reaction rate between the two acids is due to their different levels of dissociation in water. Hydrochloric acid is a strong acid and completely dissociates in water, releasing a high concentration of hydrogen ions (H+) in solution. In contrast, ethanoic acid is a weak acid and only partially dissociates in water, releasing a low concentration of hydrogen ions in solution. As a result, the reaction between magnesium and hydrochloric acid is more vigorous because of the high concentration of hydrogen ions in solution, whereas the reaction between magnesium and ethanoic acid is slower due to the lower concentration of hydrogen ions in solution.

Explanation:

Answer:

correct comparative pH, such as, 0-3 (strong) 4-6 (weak) • named reaction, such as, with a reactive metal or a named carbonate • comparative results or observations of the named reaction, such as, faster reaction (strong) or greater volume of gas produced in a given time (strong) 

Explanation:

Explanations of different results • weak acids are only partially ionised in aqueous solution • strong acids are completely ionised in aqueous solution/ greater concentration of H+ ions • aqueous solutions of acids at the same concentration/ powder, same temperature