A neutral atom contains equal numbers of protons and electrons.

TRUE OR FALSE AND WHY
ASAPPPPP!!!!!!!!!

Answer:

b) The amount of energy required to eject an electron from an atom.

An alkene in the presence of a halogen (such as chlorine or bromine) can be used to prepare an alkyl halide as a major product by the halogenation process.

Halogenation is a type of chemical reaction that involves the addition of a halide, such as chlorine or bromine, to an alkene.

The halide is typically used in excess to ensure that the reaction proceeds to completion and that the alkyl halide is the major product.

The general reaction is as follows:

RCH=CHR' + X2 → RCHX-CH2R'

Where R and R' are alkyl groups, and X is a halide. For example, if we use ethene (CH2=CH2) and bromine (Br2), the reaction would be:

CH2=CH2 + Br2 → CH2Br-CH2Br

The product of this reaction is 1,2-dibromoethane, an alkyl halide.

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Answer:

It seems believable and familiar.

Explanation:

Plz mark Brainlest

Niels Bohr's model of the hydrogen atom explains the observed lines in the hydrogen spectrum as a consequence of the electron's quantized energy levels.

According to Bohr's model, electrons can only occupy certain discrete energy levels around the nucleus. When an electron transitions between these energy levels, it emits or absorbs energy in the form of electromagnetic radiation, such as light.

The specific wavelengths of light emitted or absorbed correspond to the energy differences between the electron's initial and final energy levels. This accounts for the distinct lines observed in the hydrogen spectrum, known as the emission or absorption lines, which are characteristic of the transitions of electrons within the hydrogen atom.

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Electrophillic addition occurs when the substrate has a double bond and the attacking agent is a electrophile.

The term electrophillic addition refers to a type of addition that occurs when the substrate has a double bond and the attacking agent is a electrophile.

The mechanism of the electrophillic attack on methyl propene as shown indicates that the attacking agent is an electrophile(Br^+).

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Answer: There are 0.25 moles of NaOH  in a sample that weighed 10g.

Explanation:

Given: Mass of NaOH = 10 g

Molar mass of NaOH is 40 g/mol.

Number of moles is the mass of substance divided by its molar mass.

Therefore, moles of NaOH are calculated as follows.

\(No. of moles = \frac{mass}{molarmass}\\= \frac{10g}{40 g/mol}\\= 0.25 mol\)

Thus, we can conclude that there are 0.25 moles of NaOH  in a sample that weighed 10g.

The presence of lauric acid in a test tube will lower the freezing point of the solution compared to the pure solvent. The amount of lowering in the freezing point is directly proportional to the concentration of the solute in the solution. This effect is known as depression of the freezing point.

If the amount of lauric acid present in the test tube is increased, the concentration of the solute will increase, and the freezing point of the solution will be further lowered. This will result in a shift of the freezing point to a lower temperature on the temperature axis.

In terms of the shape of the graph, the freezing point depression can be represented as a straight line with a slope proportional to the concentration of the solute. The graph of the freezing point depression can be used to calculate the molality (moles of solute per kilogram of solvent) of the solution, which can be used to determine the concentration of the solute in the solution.

Therefore, increasing the amount of lauric acid in the test tube will result in a further depression of the freezing point and a shift of the graph to the left on the temperature axis.

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pH = -log[H3O+] = -log(8.26 x 10^-5) = 4.083 (three decimal places because the concentration had three sig figs)

Answer:

5.7 pH

Explanation:

To find pH when given [H+], you use this formula: pH = -log[H+]

-log * 2.1e-6 = 5.6778 = 5.7 pH

The part of speech for each word or phrase that is not concise science writing are: adjective, adverb, adjective respectively.

Apart from written communication in everyday life, writing is considered the cornerstone of scientific communication. In a scientific article, concise writing is always a key feature. Hence the answer to the question is an adjective, adverb, adjective respectively.

Concise writing, according to the question, means using only the words needed to convey an idea in a simple and understandable way. In science writing, it is more critical since it involves expressing complicated concepts in straightforward language without losing the underlying scientific message.

For instance, in the given question, each of the three phrases: bright as a summer day, gracefully, and lovely are not concise science writing since they represent an excess in the usage of language. Therefore, they do not adhere to the rules of conciseness in writing.

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Answer:

because they take thousands or even millions of years to naturally replenish or replaced , which is not the average human lifetime

It became thicker and its viscosity decreased and cannot flow as easily as before.

You ignite a chemical reaction by adding the borax solution to the glue mixture.

In a chemical reaction, the molecules of glue and borax combine to form a flexible, springy new substance. With rubber's vulcanization serving as a model, chemical cross-linking has been extensively employed to change the physical properties of polymeric materials.

Chemical links between polymer chains provide a substance with a more solid structure and perhaps a better-defined shape. It thickened and lost viscosity, making it more difficult to flow than it once could.

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Answer:

respritory and circulatory systems

lungs and heart

Explanation:

At 1911 ° C temperature will He atoms have the same the root mean square speed as N2 at 25°C

According to formula of rms speed

\(U_{rms}\) = \(\sqrt{\frac{3RT}{M} }\)

\(U_{rms}\) = (N2) = \(U_{rms}\) (He)

\(\sqrt{\frac{3RT}{28} }\) =  \(\sqrt{\frac{3R 273}{4} }\)

T = 273 x 28 / 4 = 1911 °C

The square root of temperature and the square root of the molar mass are both directly proportional to the rms velocity. Thus, doubling the rms velocity of the molecules when the temperature of a given gas is quadrupled. The arithmetic mean of the velocity of individual particles or molecules is known as Average velocity, while the root mean square velocity is defined as the square root of the mean square of the velocity of individual particles or molecules. The average speed of an object on a particular axis is known as the rms velocity.

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Answer:

B

17.6%

Explanation:

1. Percentage yield = (Actual yield/theoretical yield) x 100

2. You know actual yield of ammonia (60kg) so you need to work out theoretical yield.

3. mols of hydrogen = m/mr = 60,000/2 = 30,000 mols.

4. 3:2 ratio so (30,000/3) x 2 = 20,000 mols of Ammonia.

5. Therefore mass of ammonia = mr x mols = 20,000 x 17 = 340,000 grams

6. So percentage yield is (60,000/340,000) x 100 = 17.6

The statements correctly describe resonance structures is The actual molecule is an average of the Lewis structure. Therefore, option B is correct.

The representations known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

The electronic bonding of a single polyatomic species, including fractional bonds and fractional charges, is described by resonance structures, which are a collection of two or more Lewis structures.

In comparison to separate resonance structures, the resonance hybrid is more stable. The movement of a charge between two or more atoms is frequently represented by resonance structures. These atoms have a more evenly distributed charge, which makes it more stable.

Thus, option B is correct.

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Answer:

The release of methane from thawed permafrost.

Explanation:

The complete question is

A group of scientists in Alaska notices that not only have atmospheric CO2 levels increased at their sampling site but so too have methane levels. What could account for this increase in methane levels?

- None of the answer options is correct.

- The release of methane from thawed permafrost.

-A decrease in beef production near the researchers' sampling area.

-The melting of permafrost accompanied by the thawing of methane-producing bacteria.

-The failure of rice paddies to be established in Alaska, given its climate.

Permafrost regions like the arctic circle hold a large supply supply of methane in their soils and their seas. Ordinarily, this methane should be gradually released naturally over a long period of time, but the effects of global warming is making these permafrost to thaw at a much faster rate, accelerating the release of methane into the atmosphere. The dark side is that methane is about 80 times more deadly when compared to CO2 in its contribution to the green house effect on earth.

The mean of the sample is 0.97 while the standard deviation of the sample is 0.015.

The average density is the sum of the density values divided by the total number of measurements.

In this case, we have three trials, the mean of the samples is \(0.96 + 0.99 +0.95/3 = 0.97\)

The standard deviation is obtained from;

s= \(\sqrt{(0.96 - 0.97)^2 + (0.99 - 0.97)^2 + (0.95 - 0.97)^2/(3 - 1)}\)

s = \(\sqrt{(0.0001) + (0.0004) + (0.0004)/2}\)

s = 0.015

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River water stored behind a dam is best described as a form of Potential Energy.

What is Potential energy?

Potential energy is refered to as energy that is stored – or conserved - in an object or substance. This stored energy is based on the position, arrangement or state of the object or substance. There are two types of potential energy namely:

The water or river behind a dam stores gravitational potential energy since it is at a higher level than the water on the other side of the dam.

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The equilibrium constant (K) for the given reaction is approximately 1.769.

To calculate the equilibrium constant (K) for the given reaction, we need to determine the molar concentrations of the species involved at equilibrium. The equilibrium constant expression for the reaction is as follows:

K = [A₂B] / ([A]²[B])

Given:

Initial moles of A (a): 3.1 moles

Initial moles of B (b): 2.5 moles

Initial moles of A₂B: 1.7 moles

Volume of the container: 5.0 liters

To calculate the molar concentrations at equilibrium, we need to convert the moles to concentrations by dividing by the volume of the container:

[A] = moles of A / volume of container

[A] = 3.1 moles / 5.0 liters

[B] = moles of B / volume of container

[B] = 2.5 moles / 5.0 liters

[A₂B] = moles of A₂B / volume of container

[A₂B] = 1.7 moles / 5.0 liters

Now, we can substitute these concentrations into the equilibrium constant expression:

K = [A₂B] / ([A]²[B])

K = (1.7 moles / 5.0 liters) / ((3.1 moles / 5.0 liters)² * (2.5 moles / 5.0 liters))

Simplifying the expression:

K = (0.34) / ((0.62)² * (0.5))

K = (0.34) / (0.3844 * 0.5)

K = 0.34 / 0.1922

K ≈ 1.769

Therefore, the equilibrium constant (K) for the given reaction is approximately 1.769.

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The reaction is an addition reaction.

Addition reactions are chemical reactions involving 2 or more reactants reacting to produce a single product.

Addition reactions are different from decomposition reactions. In the latter, a single reactant decomposes to give two or more products.

In the illustrated reaction, Cl₂O5 and H₂O react together to form a single product, HCIO3.

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Three controls that determine if a material will deform in ductile/ brittle manner is temperature , pressure and composition of the material.

The composition of material is based on how fast it can be worked or deformed if a material is either ductile or brittle . Deformation is considered a generic word for all alteration to a material body initial size or shape.

At elevated temperatures, the majority of material can exhibit enhanced ductility. whereas when the  the climate is sufficiently lowered, a ductile to brittle change is also seen.

Pressure can be used to improve a material's brittle resilience. As an illustration, this occurs in the brittle-ductile transitional phase.

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The substrate is a cyclohexane ring. There will be six different alkenes produced when the cyclohexane ring is treated with a strong base.

What is alkenes?
Alkenes are a common family of hydrocarbons discovered in crude oil. There is at least one carbon-carbon double bond in this family. This double bond significantly alters the chemistry of the family's compounds.

Alkenes, and ethene in particular, play a crucial role in the chemical industry. They are created through the cracking of the alkanes but are not present in significant amounts in crude oil. Like all hydrocarbons, alkenes burn in the presence of air to produce carbon dioxide and water. Ethene reacts violently in oxygen, making it ineffective as a fuel. Additionally, the alkenes are too useful for the production of plastics and numerous other chemicals that are used as fuels in the chemical industry.

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Need to dilute 21.4 mL of the stock solution to make 1500 mL of 0.220 MM NH3NH3 solution.

To make a 1500 mL solution of 0.220 MM NH3NH3, you will need to dilute the stock solution of 15.4 MM NH3NH3. The dilution formula is:

C1V1 = C2V2

where C1 is the concentration of the stock solution (15.4 MM), V1 is the volume of the stock solution to be used (unknown), C2 is the desired concentration of the final solution (0.220 MM), and V2 is the final volume of the solution (1500 mL).

Rearranging the formula to solve for V1, we get:

V1 = (C2V2) / C1

Plugging in the values, we get:

V1 = (0.220 MM x 1500 mL) / 15.4 MM

V1 = 21.4 mL

Therefore, need to dilute 21.4 mL of the stock solution to make 1500 mL of 0.220 MM NH3NH3 solution.

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Answer:

The killers who choose poison for killing the victim are the one who does not want to confront the victim. When a knife or a bullet is used to kill a person he may struggle and can cause harm to killer also.  

Explanation:

Poison is the most easiest way to kill a person without any struggle. The poison can be given to a person in a juice or through an injection. The poison entered in the body of victim will cause his heart to cease gradually and he will not have energy to struggle with the killer to save his life.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 10 × 25

We have the final answer as

Hope this helps you

The metals you worked with in this simulation, the most likely to be found in pure form in nature is copper, silver, and gold.  While iron and aluminum are the least likely to be found in pure form in nature. Keep reading to learn more.

Elements that can be found in nature as a pure substance are known as native elements. Only a few metallic elements can be found in nature as pure substances, whereas the majority are found as compounds that are combined with other elements. Copper, silver, and gold are examples of native elements. The existence of these metals in their native state can be attributed to their relatively low reactivity and ability to resist chemical and physical changes

Iron and aluminum, on the other hand, are highly reactive metals and are therefore rarely found in nature in their pure state. Instead, they are found in combination with other elements such as oxygen, sulfur, or fluorine. Iron exists in minerals like hematite and magnetite, whereas aluminum is found in minerals such as bauxite and feldspar. In conclusion, copper, silver, and gold are the metals that are most likely to be found in pure form in nature, whereas iron and aluminum are the least likely to be found in pure form in nature.

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The minimum pressure of ideal gas is 135.36 psi.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.

From the question above, we know that

V₁ = 250 mL = 0.25 L

V₂ = 2.5 L

P₂ = 700 torr

When the initial and final temperature is the same, we can use the ratio of pressure and volume as

P₁ . V₁ = P₂ . V₂

P₁ . 0.25 = 700 . 2.5

P₁ = 7000 torr

convert to psi

P₁ = 7000 torr

P₁ = 7000 / 51.715 psi

P₁ = 135.36 psi

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Explanation:

Elements that belong to the same period which is seen horizontally in the periodic table have different properties. Elements with similar properties are seen in columns or groups. Elements in the same period have similar principal quantum number and belong to the same principal shell. Hence the answer is that they have different properties that repeat across the next period.

A molecule with strong intermolecular forces will have a weak or low vapor pressure.

Molecules generally with a high intermolecular force of attraction will have a low vapor pressure. This is because since the force of attraction between molecules is high as they are tightly packed, only fewer molecules will get a chance to move with kinetic energy at a given temperature.

Whereas, molecules with weak intermolecular force can travel easily and escape and so will have a greater vapor pressure. But it is not the case with strong intermolecular forces. Molecules with high vapor pressure are called volatile. Therefore, the molecules with strong intermolecular forces will have a low vapor pressure, and only that is expected to happen in such cases.

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