The length of nylon rope from which mountain climber is suspended has force constant of 1.14 X 104 N/m (2)
A. What is the frequency (in Hz) at which he bounces_ given that his mass plus the mass of his equipment 85.0 kg? B How much would this rope stretch (in cm) to break the climber's fall if he free-falls 2.00 m before the rope runs out of slack? Hint: Use conservation of energy; cm C. Repeat both parts of this problem in the situation where twice this length of nylon rope is used frequency (in Hz) stretch length (in cm) cm

Answer:

A. 35

B. 7

C. halogênios

Explanation:

Aqui, para responder a essa pergunta, precisaremos conhecer o elemento particular em questão.

..... 4s ^ 2 3d ^ 10 4p ^ 5 significa que está a cinco elétrons da configuração eletrônica do último elemento na primeira camada dos metais pesados.

O último elemento da 1ª série do elemento de transição é o zinco, portanto, como está a apenas 5 elementos de distância, o átomo de que estamos falando é o átomo de Bromo de Bromo.

A. O zinco tem um número atômico 30 e como o bromo está a 5 elementos de distância, seu número atômico é 35

B. Uma vez que pertence ao grupo halogênio, tem 7 elétrons de valência como o resto da família

C. Pertence à família dos halogênios

So,

First of all, there are too many types of intermolecular forces:

1. Dispersion forces: London dispersion force is a weak intermolecular force between two atoms or molecules in close proximity to each other. The force is a quantum force generated by electron repulsion between the electron clouds of two atoms or molecules as they approach each other. Every molecules have this kind of force.

2. Dipole: Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. They are much weaker than ionic or covalent bonds and have a significant effect only when the molecules involved are close together (touching or almost touching).

3. Hydrogen-bonding: Hydrogen bonding is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.

Let's begin with hypobromous acid (HBrO).

HBrO is a compound that can form Hydrogen bonds since there's a hydrogen atom bonded to an Oxygen atom.

This compound also presents dispersion forces since atoms are close to each other.

And, there's also dipole-dipole forces because as you can see, there's a positive end (H+) and a negative end (BrO-).

Now, let's analyze SiH4:

SiH4 is composed of molecules, for which the only intermolecular forces are London dispersion forces.

There's no Hydrogen Bonding because Hydrogen can't bond to a very electronegative element such as O, N or F.

As you see, Si is not a very electronegative element.

And, there's not dipole-dipole forces because there's not a positive or a negative end. In this compound, H and Si share all their electrons but there's not any charges when they are close together.

Let's check now Oxygen difluoride (OF2):

As you can notice, London dispersion forces are present in all compounds, so, this is the first force identified.

Now, there's not Hydrogen, so, this molecule can't form Hydrogen-Bonds with itself.

If we look at the dipole-dipole forces, we can clearly notice that OF2 is a bent polar molecule. That means that it actually has this kind of force.

And, finally, carbon monoxide (CO):

Because CO is a polar molecule, it experiences dipole-dipole attractions.

We also know that there's London dispersion forces.

There's no Hydrogen Bonding in this molecule.

Answer:

the coefficients for HgO2 Hg+O2

Explanation:

the coefficient is 2

Hg= mercury element 80 aka quick silver

O2=oxygen can not have less than 2 atoms or it will be unstable so it forms a bond between the 2 oxygen atoms  

Answer:

Particles are moving from regions of high concentration to low concentration.

hope this answer correct (^^)

Answer:

A. Particles are moving from regions of high concentration to low concentration.

Explanation:

took a test

When 16.68 grams of methane (CH4) are burned. Therefore, 2.06moles  of oxygen gas will be used.

A mole is merely a measuring unit. In reality, it is one of the International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.

Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions could also be misleading. As a result, scientists devised the moles to bridge the divide between extremely small and extremely huge numbers.

CH\(_4\) + 2 O\(_2\) \(\rightarrow\)CO\(_2\)+ 2 H\(_2\)O

moles of methane = 16.68 /16.04=1.03moles

the mole ratio between methane and oxygen is 1:2

mole of oxygen = 2×1.03=2.06moles

Therefore, 2.06moles  of oxygen gas will be used.

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Here's the ranking from most to least viscous: CH₃CH₂(CH₂)₁₁CH₂CH₃(Longest carbon chain), CH₃CH₂(CH₂)₇CH₂CH₃,CH₃CH₂CH₂CH₂CH₃ (Shortest carbon chain). Therefore, the substance with the longest carbon chain, CH₃CH₂(CH₂)₁₁CH₂CH₃, is expected to be the most viscous, followed by CH₃CH₂(CH₂)₇CH₂CH₃, and then CH₃CH₂CH₂CH₂CH₃ with the shortest carbon chain.

CH₃CH₂(CH₂)₁₁CH₂CH₃ has the longest carbon chain, consisting of 13 carbon atoms. Since longer carbon chains tend to have higher viscosity, this substance is expected to be the most viscous among the three. CH₃CH₂(CH₂)₇CH₂CH₃ has a shorter carbon chain compared to the first substance, with only 9 carbon atoms. Although it is shorter than the first substance, it still has a considerable length. Hence, it is expected to have lower viscosity compared to the first substance but higher viscosity than the last substance.

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The organic nutrient stored in peanuts come from the peanut plants whereby peanut plants use sunlight to change inorganic matter into organic nutrients.

Option B is correct.

Inorganic matters are components of the soil as well as the CO₂ present in the soil. Thus, peanut plants use these inorganic matters together with the sunlight to carry out photosynthetic activities to manufacture food to the peanut plant so that the peanut plant can germinate, flower, and produce peanuts.

The process of the change of the inorganic matter to organic nutrients are as follows:

Peanut plants                        → peanuts                     → Peanut butter.

(inorganic material present)   (organic nutrients)     (processed peanuts)

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Answer:b

Explanation:

approved by me and A P E C

According to the molecular geometry, the shape of of compound with central sulfur atom with two unshared pairs of electrons and single bonds to two hydrogen atoms is V-shaped and bond angle is 92.1 °.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

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Answer:

pH of HCl solution is 1.52, which suggests that dilute HCl solution is very acidic in nature.

This is a single replamecement reaction, also called single displacemente reaction, since we have the Fe taking the place of H2 and forming a compound with sulfate ion (SO4^-2)

The force that exists between electrically charged particles or objects at rest is known as the electrostatic force.

Due to their electric charges, particles can be attracted to or repelled by electrostatic forces. This force is also known as the Coulomb force or Coulomb contact, and it was first described in 1785 by French physicist Charles-Augustin de Coulomb.

While opposite charges attract one another, like charges repel one another. For instance, two positively charged protons, two negatively charged electrons, or two anions all repel one another. Both cation and anions, as well as protons and electrons, are drawn to one another.

Hence, electrostatic forces exist between charged particles..

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The rate of production of P₄ in the experiment is 0.014 M/s

The rate of a reaction is the rate at which reactants molecules are used up or the rate at which product molecules are formed.

The rate of a reaction is given mathematically as follows:

The average rate of production of P₄ in given by the change in concentration, Δ[P₄], divided by the corresponding change in time, Δt.

Rate of production of P₄ = (0.8 M - 0.3 M) / (54 - 19)

Rate of production of P₄ = 0.014 M/s

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Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.

Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.

If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.

Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.

Physical properties of minerals include color,streak, luster,specific gravity and cleavage.

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An ester is mixed with LiNHCH3 in order to perform a SNAc mechanism.

The LUMO in this reaction refers to the lowest unoccupied molecular orbital. To determine the LUMO in this reaction, you need to consider the molecular orbitals of the reactants involved. The LUMO can be found by analyzing the electronic structure of the ester and LiNHCH3.

                                           Specific ester or LiNHCH3 compound in your question, so it is not possible to determine the exact LUMO in this reaction. If you provide more information about the specific compounds involved, I would be happy to help you further.

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Reeta could have made the water which is fit for drinking purposes using the materials available to her.

With the available materials, Reeta would have taken the following steps to purify water.  

Firstly, she can filtered the muddy water with the help of a muslin cloth, which is mainly used for the purification purposes. Now, she has to tie a piece of Alum with the help of a thread and submerge it in water and then leave the water which is undisturbed for some time. After resting, the impurities will finally settle down at the bottom and the water from the top can be drained off. Now she has to boil the discarded water for 10 minutes by covering it with the pan and making it cool down followed by filtering the water. And finally, the water will be purified with filtration that will make it fit for drinking purpose.

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The Lewis structure of \($CH_3NH_2$\) (methylamine) shows that the nitrogen atom is bonded to three hydrogen atoms and one carbon atom, and has one lone pair of electrons.

Lewis structures are diagrams that show the bonding between atoms and the lone pairs of electrons present in molecules. The Lewis structures for three molecules are given as follows.

Firstly, the Lewis structure of \($CH_3NH_2$\) (methylamine) shows that the nitrogen atom is bonded to three hydrogen atoms and one carbon atom, and has one lone pair of electrons. Secondly, the Lewis structure of \($CH_3CO_2CH_3$\) (dimethyl carbonate) shows two carbon atoms with three hydrogen atoms or alkyl groups bonded to them, and two oxygen atoms with double bonds in resonance with each other.

Finally, the Lewis structure of \($NH_2CO_2H$\) (glycine. It is an amino acid) shows that molecule has a zwitterionic structure. Also with a positively charged nitrogen atom and a negatively charged oxygen atom.

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The [H+] of the solution is 2.11 × 10⁻¹² mol/L, the [OH-] is 3.76 × 10⁻³mol/L, and the pOH is 2.32.

This can be expressed as:

pH = -log[H+]

We can rearrange this equation to solve for [H+]:

\([H+] = 10^{-pH}\)

Substituting the given pH of 11.36 into this equation, we get:

\([H+] = 10^{-11.36} = 2.11 * 10^{-12} mol/L\)

Since water can dissociate into hydrogen ions (H+) and hydroxide ions (OH-), we can use the equation Kw = [H+][OH-] to find the hydroxide ion concentration [OH-] in the solution:

Kw = [H+][OH-] = 1.0 × 10⁻¹⁴

[OH-] = Kw / [H+] = (1.0 × 10⁻¹⁴) / (2.11 × 10⁻¹²) = 4.74 × 10⁻³ mol/L

The pOH of the solution is defined as the negative logarithm (base 10) of the hydroxide ion concentration [OH-]:

pOH = -log[OH-] = -log(4.74 × 10⁻³ = 2.32

Finally, we can use the relationship between pH and pOH to find the hydrogen ion concentration [H+] and the hydroxide ion concentration [OH-]:

pH + pOH = 14

pH = 14 - pOH

11.36 = 14 - pOH

pOH = 2.64

\([H+] = 10^{-pH} = 10^{-11.36} = 2.11 * 10^{-12} mol/L\)

\([OH-] = 10^{-pOH} = 10^{-2.64} = 3.76 * 10^{-3} mol/L\)

Therefore, the [H+] of the solution is \(2.11 * 10^{-12} mol/L\), the [OH-] is \(3.76 * 10^{-3}\)mol/L, and the pOH is 2.32.

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Answer: To develop a strategy for the order in which you add the various equations.

Explanation:

In a Hess’s Law problem, you have to develop a strategy for the order in which you add the various equations. hope this helps <3

The statement, that describes Hess's law applied in calculating enthalpy is "all the reactions in a path are added together."

Hess' law of continuous heat summation, abbreviated as Hess' law.  Hess' law says that the rise in enthalpy, or reaction heat at constant pressure, in a chemical reaction is independent of the process between the starting and final states.

According to Hess's Law, the enthalpy change for a chemical reaction is independent of the route travelled. This indicates that the overall enthalpy change will be the same regardless of how many steps are completed. Because enthalpy is a state function, we can calculate the overall change in enthalpy by simply adding the changes at each step along the way until the product is obtained All processes must take place at the same temperature, and the equations for each step must balance.

In a Hess's Law problem, you must devise a technique for adding the numerous equations in the correct order.

Hence the correct answer is B.

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Al = 13 protons, 10 electrons, 14 neutrons

S = 16 protons, 18 electrons, 17 neutrons

P = 15 protons, 18 electrons, 19 neutrons

Hope this helped!

Answer:

Both the assertion and reason are false

Explanation:

A buffer is a solution that resists changes in acidity and alkalinity. When a solution is buffered, it pH can only vary within a small range. A buffer is made up of a weak acid/base and its salt.

When a strong acid is added to a buffer solution, the conjugate base will react with the H+ from the strong acid to form the undissociated weak acid HA as follows; H+(aq) + A- (aq)→ HA(aq). Hence, H+ concentration decreases owing to its reaction with the A- thus the pH changes only slightly.

At the time when the strong acid should be added so here Both the assertion and reason are false

It is a solution that resists changes with respect to the acidity and alkalinity. When a solution should be buffered, it pH can only change within a small range. At the time when a strong acid should be added to a buffer solution, the conjugate base should be react with the H+ from the strong acid to form the undissociated weak acid.

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Answer:

go to the website quizlet it will help you!!!!!!!!

Explanation:

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.

Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.

 t = (L^2) / (4D)

where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).

Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.

  t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds

  Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days

  Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.

Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.

  t = (L^2) / (4D)

  Rearranging the equation to solve for L:

  L = √(4Dt)

  Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))

  L ≈ 49.65 cm or 0.163 ft

The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.

The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.

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The solubility rules can be used to deduce that;

1 - Insoluble

2 - Soluble

3 - Soluble

4 - Soluble

5 - Insoluble

6 - Soluble

7 - Soluble

8 - Soluble

9 - Soluble

A set of broad recommendations for predicting the solubility of various substances in water are provided by the solubility rule, often known as the solubility guidelines or the solubility table. These principles help determine whether a chemical will dissolve in water to form a homogeneous solution or precipitate out as a solid. They are based on empirical facts.

The designation of the solubility rules served as the basis for labeling the substances as soluble or insoluble.

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The reagent NaBH₂/CH₃OH can be used to convert Ph-NO₂ into Ph-NH₂. This reagent serves as a reducing agent in the conversion process. So, option (A) NaBH₂/CH₃OH is correct.

Ph-NO₂ is the chemical formula for nitrobenzene, which contains a nitro group (-NO₂) attached to a phenyl group. To convert nitrobenzene into aniline (Ph-NH₂), the nitro group needs to be reduced to an amino group.

NaBH₂/CH₃OH is a commonly used reagent for the reduction of nitro compounds. Sodium borohydride (NaBH₂) is a mild reducing agent that can selectively reduce nitro groups to amino groups. When NaBH₂ is dissolved in methanol (CH₃OH), it provides the necessary conditions for the reduction reaction to occur.

In the presence of NaBH₂/CH₃OH, the nitro group (NO₂) in nitrobenzene is reduced to an amino group (NH₂), resulting in the formation of aniline (Ph-NH₂).

Ph-NO₂ + NaBH₂/CH₃OH → Ph-NH₂ + NaOH + BH₃

The sodium hydroxide (NaOH) and borane (BH₃) are byproducts of the reduction reaction.

So, the reagent NaBH₂/CH₃OH (sodium borohydride/methanol) can be used to convert Ph-NO₂ (nitrobenzene) into Ph-NH₂ (aniline) by selectively reducing the nitro group to an amino group. This reagent serves as a mild reducing agent in the conversion process.

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Answer:

4.65 g x 1 mol/4.0026 g/mol = 1.162 mol helium

Explanation: