Why does effervescence when the Group 2 anion precipitate is acidified imply the presence of CO_3^2-?

Answer:

pH≈10.5

Explanation:

-log(3 x 10-11)≈10.5

Answer:

C2H4(g) +H2O(g)=C2H5OH(g)

Answer:

500N/m²

Explanation:

The Pressure can be calculated using the formula:

P = F/A

Where;

F = force (N)

A = Area (m²)

Based on the information provided in the question, F = 30N, A = 0.06m²

P = F/A

P = 30/0.06

P = 500N/m²

Answer:

B: Sublimation

Explanation:

took the test on edge

Answer:

B on edge 2020

Explanation:

Please give brainliest

An intrapreneur is an individual who exhibits entrepreneurial qualities and behaviors within an established organization.

They are often innovative, creative, and take initiative to develop and implement new ideas, products, or processes within the company.  In the context you provided, someone working in labs or organizations, such as Sperti Foamt, and collaborating with members of the Arab American community can be considered an intrapreneur if they are actively seeking opportunities to drive positive change, bring about innovation, and create value within their organization. The practise of acting like an entrepreneur while employed by a huge corporation is known as intrapreneurship. Intrapreneurship is defined as the use of a corporate management style that combines risk-taking and innovative approaches, as well as the rewards and motivating strategies that are more typically associated with entrepreneurship.

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Answer:

B and C

Explanation:

is it multiple choice question??

Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.

Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.

An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.

The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.

Therefore, the size and the electron increase the Van der Waals force.

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Answer:

2.08753919851 cups

0.464942810185139 cups

2.08753919851 cups

Explanation:

i looked it up

The new boiling point of the NaCl solution is 102.91°C when 0.125 kg of NaCl is added to 750 g of water, assuming the boiling point elevation constant (Kb) of water is 0.51°C/m.

To find the new boiling point of the solution, we can use the formula:

ΔTb = Kb × m

where ΔTb is the change in boiling point, Kb is the boiling point elevation constant (0.51°C/m for water), and m is the molality of the solute.

First, we need to calculate the molality of the NaCl solution:

m = (moles of solute) / (mass of solvent in kg)

The molar mass of NaCl is 58.44 g/mol, so 0.125 kg of NaCl is:

moles of NaCl = (0.125 kg) / (58.44 g/mol) = 2.14 mol

The mass of the solvent (water) is 750 g, which is 0.75 kg.

So, the molality of the NaCl solution is:

m = (2.14 mol) / (0.75 kg) = 2.85 mol/kg

Now we can use the formula to calculate the change in boiling point:

ΔTb = Kb × m = (0.51°C/m) × (2.85 mol/kg) = 1.454°C

Finally, we can find the new boiling point of the solution by adding the change in boiling point to the normal boiling point of water (100°C):

New boiling point = 100°C + 1.454°C = 101.454°C

Therefore, the correct answer is c. 102.91°C.

The new boiling point of the NaCl solution is 102.91°C when 0.125 kg of NaCl is added to 750 g of water, assuming the boiling point elevation constant (Kb) of water is 0.51°C/m.

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Answer:

Volume

matter

mass

Density

Acceleration

Explanation:

I had this assignment and got it right also because this is a science law and they all connect to make up a gravitational system.

Answer:

1. is calcium 2,,,halogens 3 group 16 valence electrons non metal.4 .selenium

Explanation:

5. Palio atomic or monatomic hope tgis helps ig right give braniest

Intrinsic semiconductors like silicon have a bandgap, which is the energy difference between the valence band (where electrons are bound) and the conduction band (where electrons are free to move and conduct electricity).

At absolute zero temperature (0 K), all electrons are in the valence band. As the temperature increases, some electrons acquire enough thermal energy to jump across the bandgap and occupy the conduction band. The number of electrons in the conduction band depends on the energy distribution of electrons, described by the Fermi-Dirac distribution function. For silicon at room temperature (300 K), which has a bandgap of approximately 1.12 eV, most electrons remain in the valence band since only a small fraction possesses sufficient thermal energy to reach the conduction band. The Fermi energy (E_F), which represents the energy level where there is a 50% probability of finding an electron occupied, is located close to the valence band energy level. Consequently, the number of electrons in the conduction band for silicon at 300 K is relatively low. While not exactly zero, it is considered negligible for practical purposes. The vast majority of electrons still reside in the valence band. Therefore, the conduction band of silicon at this temperature contains only a small fraction of the total number of electrons in the material.

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Answer: Nuclear fusion is a nuclear reaction where atomic nuclei of a low atomic number fuse to form a heavier nucleus releasing energy.

Explanation:

Answer:

ganda no beeeeeèeeeeee

When a reaction has reached equilibrium with a given set of conditions, if the conditions are not changed, the reaction will remain at equilibrium forever. The forward and reverse reactions continue at the same equal and opposite rates and the macroscopic properties remain constant.

It is possible, however, to disturb that equilibrium by changing conditions. For example, you could increase the concentration of one of the products, or decrease the concentration of one of the reactants, or change the temperature. When a change of this type is made within a reaction at equilibrium, the reaction is no longer in equilibrium. When you alter something in a reaction at equilibrium, chemists say that you put stress on the equilibrium. When this occurs, the reaction will no longer be in equilibrium and the reaction itself will begin changing the concentrations of reactants and products until the reaction comes to a new position of equilibrium. How a reaction will change when a stress is applied can be explained and predicted. That is the topic of this section.

Answer:

a cell or battery

Explanation:

this is because a voltaic cell is such a cell where chemical energy gets converted to electrical energy. the energy conversion in the case of an electrolytic cell is from electric to chemical (battery supplies electrons to the anode respectively). So, I feel by adding a cell or battery, we can change the way energy conversion takes place, thereby changing the process.

Diagrams that show the valence electrons of atoms within a molecule are called Lewis structures, also referred to as Lewis dots or electron dot structures. Dot structures for B₂CO and C₂B₂O₂ are attached below.

The valence electrons of atoms and molecules can be visualized using these Lewis symbols and structures, whether they are found as lone pairs or enclosed in bonds.

One pair of electrons is shared by two chlorine atoms when they combine to form a chlorine molecule, for instance: According to the Lewis structure, each Cl atom has three lone pairs of electrons, or pairs of electrons that are not used in bonds, and one shared pair of electrons.

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The changes occur in reaction are the bond in H₂ is broken, and new bonds are formed between hydrogen and oxygen atoms.

Hydrogen bond is a type of chemical bond which is formed between the hydrogen atom and more electronegative atom due to high dipole interaction.

Given chemical reaction is:

2H₂ + O₂ → 2H₂O

In the above reaction hydrogen nucleus not loses proton inspite of that it was broken and new bond formation takes place in water.

Despite the fact that oxygen atoms attract electrons from hydrogen atoms, oxygen atoms do not gain electrons.

In the water molecule each electron of both hydrogens is shared with an oxygen atom.

As a result, in the preceding equation, the hydrogen molecule's bond is broken, a new bond is formed, and each hydrogen atom's electron is shared with an oxygen atom.

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Answer:

c and d on edge 2022

Explanation:

Based on the analysis, the lesson that the Egyptians did not learn from the Hyksos invasion is option e) The reliance on isolationism.

To identify the lesson that the Egyptians did not learn from the Hyksos invasion, we need to understand the historical context of the event and the subsequent actions taken by the Egyptians. The Hyksos invasion occurred during the Second Intermediate Period of ancient Egypt (17th century BCE) when a Semitic-speaking people from the Levant conquered Lower Egypt.

Step 1: Identify the lessons learned from the Hyksos invasion:

a) The importance of military strength: The Egyptians learned the significance of a powerful military to protect their borders and maintain stability.

b) The adoption of new military technologies: The Hyksos introduced horse-drawn chariots, composite bows, and other military advancements. The Egyptians learned the value of incorporating such technologies into their own military.

Step 2: Analyze the options:

c) The importance of diplomacy and alliances: The Hyksos invasion highlighted the need for Egypt to forge alliances with other regional powers. This lesson was likely learned by the Egyptians.

d) The significance of cultural assimilation: The Hyksos introduced aspects of their own culture to Egypt, including the worship of foreign deities. The Egyptians likely learned the importance of cultural assimilation to prevent social unrest.

Step 3: Determine the answer:

Based on the analysis, the lesson that the Egyptians did not learn from the Hyksos invasion is option e) The reliance on isolationism. The Egyptians recognized the importance of engaging with the outside world, forming alliances, and adopting new military technologies. Isolationism would have hindered their ability to defend against future invasions and integrate beneficial influences from other cultures.

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The option that was not a ""lesson"" that the Egyptians learned from the hyksos invasion is X bronze metallurgy the best defense

According to legend, a mystery tribe of alien invaders known as the Hyksos took control of the Nile Delta around 1638 B.C.However, there are few documented accounts of the dynasty, and modern archaeologists have uncovered little physical remnants of the historic military operation.

An invasion is when an army enters a territory, typically as part of a hostile attack during a war or other conflict. The world's history is replete with accounts of invasions.

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missing options;

Security depended upon the maintenance of ma'at.

X bronze metallurgy the best defense

Answer:

Explanation:

A pure substance is a element in it's original state.  Two metals mixed together are not pure, if they were separated they would be pure.  A rock is not pure since it is a mixture of a lot of materials, that formed that rock.  Does this help?

Answer:

False

Explanation:

Pure substance has no mixtures

Answer:

Mass, temperature, and phase.

I think temperature because the higher the temperature of a given quantity of a substance, more is its thermal energy. Similarly, for the same temperature, higher mass of a substance will contain more thermal energy.

Answer:

Structure:

Differences-  A polymer is a collection of a large number of molecules whereas a monomer is a single molecule.

A monomer is a single molecule, which has the ability to chemically bond with other monomers in a long chain. A polymer is a chain that is made when monomers bind with other monomers.

Similarities-  They are both molecules

Properties:

Differences- Monomers have polyfunctionality, which is the capacity to form chemical bonds to at least two other monomer molecules. Polymers are chemically unreactive, solids at room temperature, malleable, tough, and are electrical insulators.

Similarities- They both makeup larger forms of matter.

Intermolecular Forces

Differences: Polymers are held together by covalent bonds, hydrogen bonds, and dispersion bonds. Monomers are only held together by hydrogen bonds.

Similarities: They can both be bonded together by hydrogen bonds.

Explanation:

Solution is a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility.

A mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance

A suspension is a heterogeneous mixture of a finely distributed solid in a liquid. The solid is not dissolved in the liquid, as is the case with a mixture of salt and water.

Indicator refers to a substance that changes color when there is certain concentration of hydrogen ions in a solution.

What is an indicator?

Indicator is defined as a chemical substance which is chemically a weak acid or a weak base  which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.

These are generally derived from plant pigments  and are of slightly acidic or basic in nature.There are three types of indicators:

1) natural indicators

2) synthetic indicators

3) olfactory indicators.

These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.

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Among the various levels of gene regulation, epigenetic control is considered the least reversible and the most drastic form of control.

Epigenetic modifications involve changes to the structure or chemical modifications of DNA or associated proteins that can affect gene expression without altering the underlying DNA sequence.

These modifications can be heritable and can lead to long-lasting changes in gene expression patterns. Examples of epigenetic modifications include DNA methylation and histone modifications.

Once these modifications are established, they can persist through cell divisions and potentially across generations.

Reversing or altering epigenetic modifications is more challenging and less readily achievable, making it a relatively stable and significant form of gene control.

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The minimum energy needed by the photons to react with silver bromide in the film is approximately 57.9 kJ/mol. Then, the wavelength is 206 nm.

Wavelength of a wave is the distance between two consecutive crests or troughs of the wave.

To find the wavelength of the energy in nm, we can use the equation:

E = hc/λ

where E is the energy in joules, h is Planck's constant (6.626 x 10⁻³⁴ J s), c is the speed of light (2.998 x 10⁸ m/s), and λ is the wavelength in meters.

First, we need to convert the energy from kJ/mol to J/photon:

57.9 kJ/mol = 57.9 x 1000 J/mol / 6.02 x 10²³ mol^-1

= 9.626 x 10²⁰ J/photon

Now we can use the equation above to find the wavelength:

9.626 x 10²⁰ J/photon = (6.626 x 10⁻³⁴ J s)(2.998 x 10⁸ m/s) / λ

Solving for λ, we get:

λ = hc/E = (6.626 x 10⁻³⁴ J s)(2.998 x 10^8 m/s) / 9.626 x 10⁻²⁰J/photon

  = 2.06 x 10⁻⁷ m

Finally, we convert the wavelength from meters to nanometers:

λ = 2.06 x 10⁻⁷ m x (10⁻⁹ nm/m)

  = 206 nm

Therefore, the wavelength of the energy needed to react with silver bromide in 35 mm photographic film is approximately 206 nm.

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\( \:\:\:\:\:\:\star \)For the general solubility equilibrium \(\sf \underline{AB \longrightarrow A^+ + B^-} \)the solubility product has the following expression-

\( \:\:\:\:\:\:\star\longrightarrow \sf\underline{K_{(sp)} = [A^+] \times [B^-]}\\\)

As per question, we are given that-

\( \:\:\:\:\:\:\star \) Now that we have all the required values, so we can substitute these values into the Ksp expression and solve for Ksp-

\( \:\:\:\:\:\:\star\longrightarrow \sf\underline{K_{(sp)} = [A^+] \times [B^-]}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf K_{(sp)} = 0.00343 \:M\times 0.00343\:M\\\)

\( \:\:\:\:\:\:\longrightarrow \sf K_{(sp)} = 0.00343 \:molL^{-1}\times 0.00343\:molL^{-1}\\\)

\( \:\:\:\:\:\:\longrightarrow \sf \underline{K_{(sp)} = 1.17649\times 10^{-5} \: mol^2L^{-2}}\\\)

Answer: Does adding salt to water make the water boil faster that if salt is not added?

Explanation:

The scientific question for the boiling water experiment could be: "What is the effect of increasing temperature on the boiling point of water?"

This question aims to investigate how temperature influences the boiling point of water. By conducting the experiment and analyzing the results, scientists can gain a better understanding of the relationship between temperature and the physical state change of water from liquid to vapor.

The question focuses on a specific variable (temperature) and its impact on the boiling process, allowing for a targeted investigation and potential insights into the behavior of water under different conditions.

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H3PO4 + Ba(OH)2 --> Ba3(PO4)2 + H2O

so, (A) H2O + Ba3(PO4)2 is your answer.

Answer:

240 N/m

Explanation:

Using the formula as follows:

U = ½kx²

Where;

U = elastic potential energy (J)

K = spring constant (N/m)

x = stretched displacement (m)

According to the information provided in this question,

U = 35J

x = 0.54m

k = ?

U = ½kx²

35 = ½ × k × 0.54²

35 = ½ × k × 0.2916

35 = 0.2916k/2

70 = 0.2916k

k = 70 ÷ 0.2916

k = 240.05

To 2s.f, the spring constant (k) = 240 N/m.

Answer: 240

Explanation: