Will give.brainliest.

the pH scale describes the negative log of the percent _____
ion in a solution

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{2.997 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 49.784053\)

We have the final answer as

Hope this helps you

Answer: I believe you may have meant "ionization energy?" Yes, for a neutral element this is a measure of the energy required to remove a valence electron.

Explanation: See above.

By definition, The energy required for the complete removal of 1 mol of electrons from 1 mole of gaseous atoms or ions is called Ionization energy. For a neutral element this energy is a measure of how easily the element forms an ion with a charge.

The electrons are attracted to the nucleus and it is necessary to provide energy to start them.

Ionization energy is the energy required to remove an electron from a gaseous atom, isolated and in a ground state. The electrons in the last shell, which are the weakest attracted to the nucleus, are always lost. In this way the neutral atom becomes a gaseous cation (positively charged ion).

The further away the electron is from the nucleus, the easier it is to remove it, that is, the less energy is needed.

Finally:

The energy required for the complete removal of 1 mol of electrons from 1 mole of gaseous atoms or ions is called Ionization energy. For a neutral element this energy is a measure of how easily the element forms an ion with a charge.

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The H₃O+ concentration in the ammonia solution with a pH of 11.30 is approximately option C.) 5.0 x \(10 ^-^1^2\)  M.

Ammonia (NH₃) is a weak base that can undergo a reaction with water to produce hydroxide ions (OH-) and ammonium ions (NH₄+). In this reaction, water acts as an acid, donating a proton (H+) to the ammonia molecule.

The pH scale is a logarithmic scale that measures the concentration of H₃O+ ions in a solution. It is defined as the negative logarithm (base 10) of the H₃O+ concentration. Therefore, to find the H₃O+ concentration, we need to convert the given pH value to a concentration.

Given that the pH of the ammonia solution is 11.30, we can use the formula pH = -log[H₃O+] to find the concentration of H₃O+. Rearranging the equation, we have [H₃O+] = \(10^(^-^p^H^)\).

Substituting the given pH value into the equation, we get [H₃O+] = \(10^(^-^1^1^.^3^0^)\). Calculating this value yields approximately 5.0 x \(10^(^-^1^2^)\) M.

Therefore, the correct answer is: C.) 5.0 x \(10 ^-^1^2 M\)

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Answer:

10

Explanation:

thats the max

Answer:

Um do you mean kilometers?

Explanation:

If it's kilometers then 1 1/2 kilomenters = 1500 meters

Answer:

Stirring brings fresh portions of the solvent in contact with the solute, therefore allows the solute to dissolve faster.

The source of the hydroxide ion that deprotonates the alpha carbon in the aldol addition product to form the aldol condensation product is typically a strong base, such as sodium hydroxide (NaOH) or potassium hydroxide (KOH).

Deprotonation: In the aldol condensation reaction, the alpha carbon of the aldol addition product is deprotonated by a hydroxide ion (OH-) to generate an enolate intermediate. The hydroxide ion acts as a base, accepting a proton from the alpha carbon.

Strong Base: To ensure efficient deprotonation and promote the aldol condensation reaction, a strong base is commonly used. Sodium hydroxide (NaOH) and potassium hydroxide (KOH) are often employed as the source of hydroxide ions due to their high basicity.

No specific calculation is required for this question as it pertains to the general understanding of the reaction mechanism and the role of a hydroxide ion as a base.

In the aldol condensation reaction, the hydroxide ion from a strong base, such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), acts as the source of the hydroxide ion that deprotonates the alpha carbon of the aldol addition product. This deprotonation step leads to the formation of the aldol condensation product.

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Answer:

HCl + KOH ⇒ KCl + H₂O

Explanation:

Which of the following is an acid-base neutralization reaction?

Sn + 2HBr ⇒ SnBr₂ + H₂. NO. This is a single displacement reaction.

HCl + KOH ⇒ KCl + H₂O. YES. An acid reacts with a base to form salt and water.

2AlCl₃ + 3Ca(OH)₂ ⇒ 2Al(OH)₃ + 3CaCl₂. NO. This is a double dispacement reaction.

2C₂H₆ +7O₂ ⇒ 4CO₂ + 6H₂O. NO. This is a combustion reaction.

The pH of a 2.45 x 10^-3 M sulfuric acid solution is 2.61.

The pH of a solution can be calculated using the formula:

pH = -log[H+]

where [H+] represents the concentration of hydrogen ions in the solution.

For a strong acid like sulfuric acid (H2SO4), it is completely dissociated in water, meaning all of its molecules will release their hydrogen ions (H+) into the solution. Therefore, the concentration of hydrogen ions in the solution will be equal to the concentration of sulfuric acid.

In this case, the concentration of sulfuric acid is 2.45 x 10^-3 M. Therefore, the concentration of hydrogen ions is also 2.45 x 10^-3 M.

Now we can calculate the pH using the above formula:

pH = -log[H+]

= -log(2.45 x 10^-3)

= 2.61

Therefore, the pH of a 2.45 x 10^-3 M sulfuric acid solution is 2.61.

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Answer:

Explanation:

h= e/v

6.022 x 10^23 = 4.36 x 10^-18/ v

v= 6.58 x 10^15

C= lambda x frequency

3.00 x 10^8= 6.58 x 10^15 x lambda

lambda (y)= 4.56 x 10^-8

Answer:

Explanation:

λ = hc/E

6.626 x 10^-34 J-s x 2.998 x 10^8 m-s^-1

                     4.36 x 10^-18 J

= 4556.13486239

= 4.56 x 10^1 nm

Answer:

120.15

Explanation:

ta edg

Answer:

120.15

Explanation:

edg 2021

Answer:

The fourth answer choice.

Explanation:

This is the correct answer because dropping it, carrying it, won't to anything to change the physical state of the matter (the bowl).

Hope this helps! :)

Explanation:

You're required to put a glowing splinter of wood(red hot charcoal) into a test tube of unknown gas and if the wood starts burning again or rekindles. That gas is said to be oxygen. Although another gas that does that is dinitrogen(I)oxide but to differ them from each other, dinitrogen(I) oxide has a pleasant smell while oxygen is odourless.

Answer:

The valence electron configuration determines the group to which an element belongs to.

Explanation:

The valence electron configuration of an atom of an element refers to the number of electrons in that atoms outermost shell.

The valence electron configuration is related to the group number of an element in that the number of electrons in the valence shell of an atom of an element determines the group to which an element belongs to. For example, all elements having one valence electron belong to group IA of the periodic table. Similarly, all elements having seven valence electrons belong to group VIIA of the periodic table.

This is because, since the reactivity of an element is related to its ability to either gain or lose a certain number of electrons in its valence shell, elements having same number of valence electrons have similar chemical properties.

Answer:

Free chlorine involves the amount of chlorine that's able to sanitize contaminants, while combined chlorine refers to chlorine that has combined directly with the contaminants. Total chlorine is basically the sum of free chlorine and combined chlorine.

Answer:

Give a brief question

Not an awful question

Answer:

C6H12O6 (Carbohydrate)

Explanation:

This is what happens during photosynthesis. Carbon dioxide and water react in the presence of sunlight to produce carbohydrate. The reaction takes place in chloroplast. The whole equation is as follows:

6CO2 + 6H2O = C6H12O6 + 6O2

According to the forces of attraction, reaction at 40°C  with small particles and stirring would cause the reaction rate to be the fastest.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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Answer

To answer this question we need to use the following equation

P1/T1 = P2/T2

We can rearrange to make T1 subject of the formula as shown

T1 = (P1 x T2)/ P2

= (3.40 x 340)/ 5.90

= 195.9 K

If nacl solution is prepared by dissolving 90.0 g nacl in 250.0 g of water at 25°c.  The vapor pressure of the solution if the vapor pressure of water at 25°c is 23.56 torr . the closest  is option  A. 21.21 torr

To calculate the vapor pressure of the solution, we need to use Raoult's law, which states that the vapor pressure of a solution is proportional to the mole fraction of the solvent in the solution. The equation for Raoult's law is:

P = X_solvent * P°_solvent

where:

P is the vapor pressure of the solution,

X_solvent is the mole fraction of the solvent (in this case, water),

P°_solvent is the vapor pressure of the pure solvent (in this case, water).

We can first calculate the mole fraction of water in the solution as follows:

Moles of water = mass of water / molar mass of water

= 250.0 g / 18.015 g/mol

= 13.87 mol

Moles of NaCl = mass of NaCl / molar mass of NaCl

= 90.0 g / 58.44 g/mol

= 1.539 mol

Total moles = moles of water + moles of NaCl

= 13.87 mol + 1.539 mol

= 15.41 mol

The mole fraction of water is then:

X_water = moles of water / total moles

= 13.87 mol / 15.41 mol

= 0.899

Using Raoult's law and the given vapor pressure of water at 25°C (P°_water = 23.56 torr), we can calculate the vapor pressure of the solution as:

P = X_water * P°_water

= 0.899 * 23.56 torr

= 21.14 torr

Therefore, the vapor pressure of the solution is 21.14 torr, which is closest to option A, 21.21 torr.

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Answer:

the charge of an element is equal to the number of orotons minus the number of electrons. the number if proton is equal to the number of elements given in the periodic table. the number of electrons is equal to the atomic numver minus the CHARGE of the atom

Answer:

A chemical reaction is described by achemical equation, an expression that gives the identities and quantities of the substances involved in a reaction. A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow

Answer:

sodium + chlorine → sodium chloride

Explanation:

This was the answer straight from Plato. I hope that this helped you, please mark me the brainiest, like and rate my answer if it did! :)

The amount of heat needed to increase the temperature of a metal's unit mass by one degree is known as its specific heat.

Thus, It is a measurement of the thermal energy storage capacity of the metal molecules at the molecular level and specific heat.

The atomic structure of the metal, its atomic weight, temperature, phase, and impurities are only a few of the variables that have an impact on this number and Specific heat.

Every metal has a different specific heat. It is possible for metals with the same elemental structure to have varying values. The atomic structure, mass, temperature, and presence of impurities in the metal, among other things, all have an impact on the specific heat value in specific heat.

Thus, The amount of heat needed to increase the temperature of a metal's unit mass by one degree is known as its specific heat.

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Sociology emerged in the early 1800s during a period of great social change when many academics and other educated citizens were fascinated by scientific discoveries social issues like the low high school graduation rate continue to interest sociologists today still important to understand and study society today because it gives students an understanding of the real world around them

Sociology is the of human society and social behavior and it started from 1800s during a period of great social change and studying social sciences gives students an understanding of the real world around them an students learn about places, cultures, and events around the world, what conspired to make them the way they are can make inferences about how the rest of the world works

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Answer:

the substance mixture can be sperate by filtration, distillation, and freezing.

Given that we know that the mass of the compound used for the trials is related to the temperature difference, it is correct to state therefore that " Approximately half the mass of salt produced approximately half the temperature change" (Option A)

An experiment is a technique that is carried out to support or deny a hypothesis, or to test the efficacy or probability of something that has never been done before. Experiments shed light on cause-and-effect relationships by revealing what happens when a specific element is changed.

Typically, the experimental variable is one or more of the sample attribute categories. It summarizes the differences between the test and control samples that you are studying.

The following are various types of experiments:

The totally randomized design is the most common experimental design.

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Full Question:

Ally completed part b of experiment IHT. In their second trial, they used half the mass of salt from their first trial. what trend would they expect to observe in the temperature change with respect to the mass salt they used in their first and second trials?


A) Approximately half the mass of salt produced approximately half the temperature change

B) No trend was observed

C) Approximately half the mass of salt produced approximately double the temperature change

Answer:

101325 pascal

Explanation:

i dont cap

Answer:

See below

Explanation:

1 atmosphere = 101 325 Pascals = 760 mm Hg = 14.6959 psi

The molar mass of the unknown acid is 152 g/mol.

Let's calculate this using titration data:

As per the given data of titration:

To determine the molar mass of the unknown acid, the following steps can be followed:

Step 1: Find the number of moles of NaOH solution used

n = M × V = 0.0700 mol/L × 0.0163 L = 0.00114 mol

Step 2: Write the balanced chemical equation for the reaction between the unknown acid and NaOH. The equation is:

HA + NaOH → NaA + H2O

Step 3: Determine the number of moles of HA from the number of moles of NaOH used. Since the unknown acid is diprotic, the number of moles of HA is half the number of moles of NaOH used. Therefore, the number of moles of HA is: 0.00114 mol/2 = 0.00057 mol

Step 4: Determine the concentration of the unknown acid in the volumetric flask using the formula:

C = n/V

where C is the concentration in mol/L, n is the number of moles of HA, and V is the volume of the volumetric flask in L.

C = 0.00057 mol/0.250 L = 0.00228 mol/L

Step 5: Determine the molar mass of the unknown acid using the formula:

M = mRT/PV

where M is the molar mass in g/mol, m is the mass of the unknown acid in g, R is the gas constant (0.08206 L·atm/K·mol), T is the temperature in Kelvin (assumed to be 298 K), P is the pressure in atm (assumed to be 1 atm), and V is the volume of the volumetric flask in L.M = 0.095 g × 0.08206 L·atm/K·mol × 298 K/1 atm × 1 L/0.250 L × 0.00228 mol/L = 152 g/mol

Therefore, the molar mass of the unknown acid is 152 g/mol.

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The valence electrons of an atom can be represented using Lewis dot structures, which are also used to depict the bonding and non-bonding electrons in molecules.

The valence electrons of an atom are shown by Lewis dot structures, sometimes called electron dot structures. To represent the element's valence electrons in these structures, dots are placed all around the element's symbol. The number of valence electrons that each element has depends on where it is on the periodic table. Dots are used to symbolize valence electrons in order to highlight the electrons that are available for formation of bonds. To display the bonding and non-bonding electrons in a molecule, Lewis dot structures are utilized. This can be useful in figuring out a compound's reactivity and chemical characteristics. The Lewis dot structure can be used to depict the electron transfer for ionic compounds, which are created when electrons are transferred from one atom to another. Atoms with a complete complement of electrons (ions with a positive charge) and atoms that have either gained or lost electrons are visible in the Lewis dot structure of an ionic compound (ions with a negative charge). The Lewis dot structure can be used to illustrate the sharing of electrons in covalent compounds, which are created when atoms share electrons. A covalent compound's Lewis dot structure reveals how its atoms share electrons via a covalent connection. The nature of chemical bonding, the stability and reactivity of compounds, and the prediction of bond angles, geometry, and polarity of molecules can all be better understood by knowing Lewis dot structures.

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