A car is traveling with an initial velocity of 15 m/s when the driver decides to go faster by accelerating at 5 m/s2 for 10 seconds. How far did the car travel during this time?

70 m


300 m


175 m


400 m

Electron configuration for manganese is [Ar]3d⁵4s² and electron configuration is the distribution of electrons of an atom or molecule

The electronic configuration of an element is a symbolic notation of the manner in which the electrons of its atoms are distributed over different atomic orbitals and atomic number of manganese is 25 then electronic configuration [Ar]3d⁵4s² manganese is a chemical element with the symbol Mn and it is a hard, brittle, silvery metal, often found in minerals in combination with iron and atomic mass is 55.93 and we write electronic configuration is 1s²2s²2p⁶3s²3p⁶4s²4d⁵ called as electronic configuration of  manganese

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Answer:

Base

Explanation:

Why is Alka-Seltzer a base?

Alka-Seltzer contains sodium bicarbonate and citric acid. The sodium citrate acts as an antacid. Excess sodium bicarbonate from the Alka-Seltzer acts to neutralize base.

Answer:

molar mass = 278.1 g/mol

Explanation:

Molar mass is the mass of one mole of element, compound, molecule, etc.

It has the units of grams per mole (g/mol), and in mole calculations, is commonly denote the symbol M.

Lead(II) chloride has the chemical formula:

\(\boxed{\rm PbCl_2}\)

The molar mass of lead chloride, is the total sum of all the individual molar masses of each element. See attached image, standard IUPAC Periodic Table found in data sheets/booklets for most chemistry exams around the world.

Hence molar mass = (207.2)+(35.45)×2 = 278.1 g/mol

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Answer:

Explanation:

The speed of the jet can be found by using the formula

\(v = \frac{d}{t} \\ \)

d is the distance

t is the time taken

From the question we have

\(v = \frac{395000}{9000} = \frac{395}{9} \\ = 43.8888...\)

We have the final answer as

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When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.

In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.

The chemical equation for the given reaction is:

\(Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Put the necessary stoichiometric coefficient to balance each element.

Balancing Na:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Balancing P:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Balancing S:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Notice that H and O are already balanced.

Hence, the balanced chemical equation for the reaction is:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

where 3 is the stoichiometric coefficient of sulfuric acid, \(H_{2} SO_{4}\).

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A photon has a frequency of 2.68 × \(10^6\) Hz then the energy of a photon is \(1.78\times10^{-27}\text{J}\).

What is meant by Planck's equation?

Planck's energy–frequency relation, or Planck's equation, gives the relationship between the energy of a photon and frequency. This equation is given by,

E = hv

Where, E be the energy of a photon

h be the Planck constant

v be the frequency

Given:

Frequency is 2.68 × \(10^6\)

Planck's constant is 6.63 × \(10^{-34}\) Js

The energy of a photon is given by,

E = hv

substitute the values in the above equation, we get

= 6.63 × \(10^{-34}\) Js × 2.68 × \(10^6\) Hz

simplifying the above equation, we get

= 1.78 × \(10^{-27}\) J

The energy of the photon is 1.78 × \(10^{-27}\) J.

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Based on the table of values given on the right, the reaction of KCLO4(s) to KCl(s) and 2O2(g) is expected to be spontaneous at room temperature.

The spontaneity of a reaction can be determined by its Gibbs free energy change (ΔG). If ΔG is negative, the reaction is spontaneous and can occur without external energy input. If ΔG is positive, the reaction is non-spontaneous and requires external energy input. The equation for calculating ΔG is: ΔG = ΔH - TΔS, where ΔH is the enthalpy change, T is the temperature in Kelvin, and ΔS is the entropy change.

The table of values given on the right shows that the enthalpy change (ΔH) for the reaction is -390.2 kJ/mol, which is exothermic. The entropy change (ΔS) for the reaction is also positive, indicating an increase in disorder in the system. Therefore, plugging in the given values into the equation ΔG = ΔH - TΔS, we get:

ΔG = -390.2 kJ/mol - (298 K) * (0.2202 kJ/K*mol)
ΔG = -390.2 kJ/mol - 65.64 kJ/mol
ΔG = -455.84 kJ/mol

Since ΔG is negative, this means that the reaction is spontaneous and can occur without external energy input.

Therefore, based on the table of values given on the right, we can expect the reaction of KCLO4(s) to KCl(s) and 2O2(g) to be spontaneous at room temperature.

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Protons are the subatomic particles which has positive charge.

The protons define the element.

So for example, every element that has 1 proton is hydrogen.

Hydrogen is a gas.

Every element that has 23 protons would be vanadium.

Vanadium is a chemical element with an atomic number 23.

Sₙ2 mechanism for nucleophilic substitution reactions involves one step and occurs with inversion of configuration. - True

The rate determining step in Nucleophilic bimolecular Substitution reaction involves the presence of both substrate and the attacking nucleophile as in this mechanism the the process of bonding of substrate with the nucleophile takes place simultaneously with the process in which the leaving group is leaving the substrate. \

Rate α [Substrate][attacking nucleophile]

So, the reaction takes place in one step.

Also, the attacking nucleophile attacks on the opposite side of the leaving group of the substrate, so this reaction occurs with inversion in configuration.

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The percent composition of salicylic acid is C7H6O3, or 60.87%C, 4.4%H, and 34.75%O

When two surface come in contact and rub each other a frictional force causing them s deformation and this leads to a voltage giving rise to a static charge.

Static charge is developed within a body temporarily with an induced polarization. These charges are not moving and set into a pole in the material.

When two materials rub against each other in which one is a conductor and other to be an insulator, they will attract by the induced polarization. Rubbing causes the free electrons in the condutor to be transferred towards the insulator.

This will cause a deformation that, the random charges in the material get polarized where the electrons in the insulator will repel to the opposite pol and positive charges will align in a pole close to the condutor.

This charge separation causes the positive pole of the insulator gets attracted into the conductor surface. Hence, there forms a static electricity by the passage of electron.

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Answer:

857mL de la solución al 7%

Explanation:

Una solución de agua oxigenada (H₂O₂) al 7% contiene 7mL de peróxido de hidrógeno por cada 100mL de solución = 7mL H₂O₂ / 100mL Sln

Para preparar un litro = 1000mL de disolución al 6% de peróxido de hidrógeno se requieren:

1000mL Sln * (6mL H₂O₂ / 100mL Sln) = 60mL H₂O₂

Para obtener 60mL de H₂O₂ a partir de la solución al 6% se requieren:

60mL H₂O₂ * (100mL Sln / 7mL H₂O₂) =

Based on the given information, it is not possible to determine the volume of the 0.750 M KOH solution needed or the pH of the HEPES solution.

To calculate the volume of a 0.750 M KOH solution that needs to be added to 5.250 g of HEPES to achieve a pH of 7.64, we need to follow a step-by-step process.

1. Determine the moles of HEPES:
  First, calculate the number of moles of HEPES using its molecular weight (MW = 238.306 g/mol). Divide the mass of HEPES (5.250 g) by its molecular weight:
  Moles of HEPES = 5.250 g / 238.306 g/mol

2. Determine the volume of KOH solution required:
  To neutralize the acidic HEPES solution, we need to use the HEPES to KOH ratio based on the balanced equation. However, the balanced equation is not provided in the question. Therefore, it is not possible to determine the exact volume of KOH solution required.

3. Calculate the pH of the HEPES solution:
  The question states that the desired pH is 7.64. However, the pKa (acid dissociation constant) of HEPES is given (pKa = 7.56). This indicates that HEPES acts as a buffer, and its pH can be controlled within a specific range. However, without the buffer capacity or the concentration of HEPES solution, we cannot accurately determine the pH.

Additional information such as the buffer capacity or the concentration of the HEPES solution is required.

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Plants use a compound called chlorophyll to absorb the energy from sunlight.

Chlorophyll is a pigment found in the chloroplasts of plant cells, particularly in the leaves. It plays a crucial role in the process of photosynthesis, which is how plants convert sunlight into chemical energy.

Chlorophyll absorbs light in the visible spectrum, particularly in the red and blue regions, while reflecting green light, which is why plants appear green to our eyes. When chlorophyll molecules absorb photons of light, they become energized. This energy is then used to power the process of photosynthesis, where carbon dioxide and water are converted into glucose (a form of sugar) and oxygen.

However, chlorophyll is the compound in plants that captures and harnesses the energy from sunlight, initiating the process of photosynthesis and allowing plants to produce the energy-rich molecules they need for growth and survival.

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Answer:

It’s a steppingstone in finding the molecular formula of an unknown compound.

Explanation:

Benzene has empirical formula of CH

Ethylene Glycol is an organic compound.

It has a molecular formula of C6H6

Which means it has 6 carbon atoms, and 6 hydrogen atoms.

To find the empirical formula for any compound we need to know how many atoms of different types are present like in case of benzene there were 6 carbon ,and 6 hydrogen atoms

empirical formula means we need to get the simplest ratio of all these atoms, so here we would divide the each different number of atoms by 6 as all these have 6 as a common factor

6 / 6 = 1  ( for Carbon )

6 / 6 = 1  ( for Hydrogen )

Hence the empirical formula becomes : C1H1 / CH

a) Adding 25 g of glucose depresses the freezing point of water by approximately 0.26 °C. b) Adding 25 g of sucrose depresses the freezing point of water by approximately 0.14 °C. c) Adding 25 g of sodium chloride depresses the freezing point of water by approximately 0.80 °C.

The freezing point of a solution is lower than the freezing point of pure water due to the presence of solute particles. The extent of this depression depends on the concentration and nature of the solute.

To estimate the freezing point depression, we can use the formula:

ΔT = Kf * m

Where:

ΔT = freezing point depression

Kf = cryoscopic constant (a property of the solvent)

m = molality of the solution (moles of solute per kilogram of solvent)

For water, the cryoscopic constant (Kf) is approximately 1.86 °C/m.

Now let's calculate the molality (m) of each solution:

a) Glucose (C6H12O6)

The molar mass of glucose is 180.16 g/mol.

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

= (25 g / 180.16 g/mol) / 1 kg

= 0.1386 mol/kg

ΔT_a = Kf * m_a

ΔT_a = 1.86 °C/m * 0.1386 mol/kg

ΔT_a ≈ 0.2579 °C

Therefore, the estimated freezing point of 1 liter of water with 25 g of glucose added is approximately -0.26 °C.

b) Sucrose (C12H22O11)

The molar mass of sucrose is 342.30 g/mol.

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

= (25 g / 342.30 g/mol) / 1 kg

= 0.0729 mol/kg

ΔT_b = Kf * m_b

ΔT_b = 1.86 °C/m * 0.0729 mol/kg

ΔT_b ≈ 0.1355 °C

Therefore, the estimated freezing point of 1 liter of water with 25 g of sucrose added is approximately -0.14 °C.

c) Sodium Chloride (NaCl)

The molar mass of sodium chloride is 58.44 g/mol.

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

= (25 g / 58.44 g/mol) / 1 kg

= 0.4279 mol/kg

ΔT_c = Kf * m_c

ΔT_c = 1.86 °C/m * 0.4279 mol/kg

ΔT_c ≈ 0.7954 °C

Therefore, the estimated freezing point of 1 liter of water with 25 g of sodium chloride added is approximately -0.80 °C.

Therefore,

a) Adding 25 g of glucose depresses the freezing point of water by approximately 0.26 °C.

b) Adding 25 g of sucrose depresses the freezing point of water by approximately 0.14 °C.

c) Adding 25 g of sodium chloride depresses the freezing point of water by approximately 0.80 °C.

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12.5 mol of the substance contains 7.53 x 10²⁴ formula units of calcium carbonate.

Calcium carbonate (CaCO₃) is a compound that consists of one calcium atom, one carbon atom, and three oxygen atoms. The formula unit of calcium carbonate contains one Ca atom, one C atom, and three O atoms. To calculate the number of formula units in 12.5 mol of calcium carbonate, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, or formula units) in a given amount of substance.

Avogadro's number (Nₐ) is 6.022 x 10²³ particles/mol. Therefore, the number of formula units of calcium carbonate in 12.5 mol can be calculated as:

n = Nₐ * 12.5 mol

n = 6.022 x 10²³ particles/mol * 12.5 mol

n = 7.53 x 10²⁴ particles

Therefore, there are 7.53 x 10⁴ formula units of calcium carbonate in 12.5 mol of the compound.

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The correct order of the steps is: carbonyl oxygen is protonated, alcohol adds to the carbonyl to form a tetrahedral intermediate, hydroxy oxygen is protonated, and alcohol displaces the hydroxy group in an SN2 reaction.

The first step in the mechanism to convert a carboxylic acid to an ester is the protonation of the carbonyl oxygen. This protonation makes the carbonyl carbon more electrophilic, allowing it to react with the alcohol in the next step. The alcohol then adds to the carbonyl to form a tetrahedral intermediate. The hydroxy oxygen is then protonated, which facilitates the leaving of the hydroxy group and the formation of the ester in an SN2 reaction.

Tetrahydrofuran (THF) and hydrogen sulphide (HSCH3) react in the specified reaction using an SN2 mechanism. SN is a particular kind of nucleophilic substitution reaction in which the nucleophile contacts the substrate directly, which causes the leaving group to be displaced in a bimolecular manner. As the nucleophile in the described reaction, hydrogen sulphide attacks the THF's carbon center. Through a coordinated process, this assault causes the leaving group—an alkyl group linked to the THF—to be displaced.

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Answer:

chemical properties

Explanation:

chemical properties did change the composition of substance, so it cannot go back to original anymore, such as burning, rusting, etc.

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Therefore, the balanced equation for the redox reaction in basic solution is:
2NO2- + Cu2+ + 4OH- → 2NO3- + Cu + 2H2O

The balanced equation for the redox reaction in basic solution is:
2NO2- + Cu2+ + 4OH- → 2NO3- + Cu + 2H2O
In this reaction, NO2- is oxidized (loses electrons) to NO3- and Cu2+ is reduced (gains electrons) to Cu. The reaction takes place in basic solution, which means that we need to balance the equation by adding OH- ions to balance out the H+ ions.
To balance the equation, we first balance the atoms in each half-reaction:
Oxidation half-reaction:
NO2- → NO3-
Add 2H2O and 4e- to the left side to balance the charge and atoms:
NO2- + 2H2O + 4e- → NO3-
Reduction half-reaction:
Cu2+ → Cu
Add 2e- to the left side to balance the charge:
Cu2+ + 2e- → Cu
Next, we balance the number of electrons transferred by multiplying each half-reaction by the appropriate factor:
Multiply oxidation half-reaction by 2:
2NO2- + 4H2O + 8e- → 2NO3-
Multiply reduction half-reaction by 4:
4Cu2+ + 8e- → 4Cu
Now we add the two half-reactions together, canceling out the electrons on both sides:
2NO2- + 4H2O + 8e- + 4Cu2+ → 2NO3- + 4Cu + 8OH-
Finally, we simplify the equation by canceling out the H2O molecules and reducing the coefficients:
2NO2- + 4Cu2+ + 4OH- → 2NO3- + 4Cu + 2H2O

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Answer:

D. 4

Explanation:

mass number - number of neutrons = number of protons

Answer:

Filtration

explanation:

Filtration is a separation method used to separate out pure substances in mixtures comprised of particles—some of which are large enough in size to be captured with a porous material. Particle size can vary considerably, given the type of mixture. For instance, stream water is a mixture that contains naturally occurring biological organisms like bacteria, viruses, and protozoa. Some water filters can filter out bacteria, the length of which are on the order of 1 micron. Other mixtures, like soil, have relatively large particle sizes, which can be filtered through something like a coffee filter.

Mole is a unit of measurement used to measure the amount of a chemical substance, with 1 mole containing 6.022 x 1023 atoms, or 1.204 x 1024 atoms.

A mole is a unit of measurement in chemistry that is used to determine the quantity of a chemical. It is described as the quantity of a material containing the same number of particles (atoms, molecules, ions, and so on) as there are atoms in 12 grammes of carbon-12.

2 moles of Ca have 2 x 6.022 x 1023 atoms. This is due to the fact that the mole (mol) is a unit of measurement used to determine the quantity of a chemical compound. 1 mol of a material corresponds to 6.022 x 1023 atoms of that substance. As a result, 2 moles of Ca contain 2 x 6.022 x 1023 atoms, or 1.204 x 1024 atoms.

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Answer:

from the spaces left between chains when the polymer is

formed.

Explanation:

Polyethylene polymer may be of high or low density. Whether the polymer is of high or low density depends on the arrangement of the polymer chains.

If the polymer chains are close together such that the resultant polymer is crystalline with chains packed closely, we have high density polyethylene.

On the other hand if the chains are not close together and there are spaces left between chains when the polymer is formed, then we have low density polyethylene.

Hence, low density polyethylene gets its name from the spaces left between chains when the polymer is formed.

Answer: it gets its name (from the process by which it's polymerized). Therefore the correct option is A.

Explanation:

Polyethylene is a type of plastic which is made by the polymerization of its monomers (ethene). The most common monomers are derived from petrochemicals. The monomers simply join together to form the polymers which has the same empirical formula as the monomer, but is of a higher molecular mass.

There are two main types of polyethylene, these include:

--> Low density polyethylene: when ethene is subject to a high temperature of about 250°C and pressure above 1500atm, together with traces of oxygen ( as an initiator), it polymerizes to polyethylene. The polyethylene obtained by the above method is called a low density polyethylene. It has the most long- and short-chain branching of any form of polyethylene, resulting in its lower density. Therefore its name is gotten from the process by which it's polymerized

--> High density polyethylene: this is prepared at a lower temperature and pressure by using catalysts.

Valence electrons in non-metal occupy directional p-orbitals.

Metal valence electrons spread out into spherical s-orbitals.

Valence electrons can be defined as the number of electrons that are present in the outermost shell of an atom. Also, valence electrons are typically used to determine whether an atom or group of elements found in a periodic table can bond with others.

This ultimately implies that, valence electrons is a property is typically used to determine the chemical properties of chemical elements.

A sublevel can be defined as an energy level that is associated with the electrons found outside the atomic nucleus.

In Chemistry, there are four (4) types of sublevel and these include the following:

I. s-orbital (sublevel): it has one (1) orbital i.e 1s.

II. p-orbital (sublevel): it has three (3) orbitals.

III. d-orbital (sublevel): it has five (5) orbitals.

IV. f-orbital (sublevel): it has seven (7) orbitals.

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The water molecule has a total of 10 protons and 10 electrons (8 from the oxygen atom and 1 from each of the two hydrogen atoms). Since it has the same number of protons and electrons, the water molecule is neutral. The electron cloud model shows where electrons are in a molecule.

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The hydrogen will mix with NADP+ to create NADPH, which will then be sent to the dark cycle.

The oxygen molecule is created when the elemental oxygen from one water molecule joins with oxygen from another water molecule.

The hydrogen will mix with NADP+ to create NADPH, which will then be sent to the dark cycle. They are the source of oxygen, as explained. Chlorophyll, a pigment found inside photosystem II of the chloroplast, is where this occurs. The Mg ion in this chlorophyll pigment experiences redox state variations (after interaction with photon). In the process, hydrogen ions are removed from the water molecule, which leads to the oxidation of the water molecule to O2. While this is happening, the hydrogen is expelled from the thylakoid and interacts with NADP+ to create NADPH (reduction process). This NADPH travels to the calvin cycle. The Rubisco enzymes are also found in the stroma area. The next enzyme, glyceraldehyde 3-phosphate dehydrogenase, is outside of the chloroplast and utilises NADPH itself. Because rubisco does not require photons of light to work, the dark cycle is the component that involves rubisco.

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The products : Zn₃(PO₄)₂ (s) + KClO₃ (aq)

Given

reaction: Zn(ClO₃)₂ (aq) + K₃PO₄ (aq)

Required

The products

Solution

Double-Replacement reactions :  an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product

General formula :

AB + CD ⇒ AD + CB

One of the characteristics of the double replacement reaction is the presence of precipitated compounds

Zn(ClO₃)₂ (aq) + K₃PO₄ (aq) ⇒ Zn₃(PO₄)₂ (s) + KClO₃ (aq)

Zn₃(PO₄)₂ (s)⇒ precipitated compounds, so that this reaction can occur

Ethyl acetate has a lower boiling point than ethyl butyrate, and it is also more polar, so it is less strongly adsorbed to the stationary phase and elutes faster. Therefore, ethyl acetate is the component of the sample that elutes faster than ethyl butyrate. The answer to the question is ethyl acetate.

Ethyl acetate elutes faster than ethyl butyrate. Gas chromatography is a method used to separate and analyze mixtures of compounds, and it is often used in the flavor and fragrance industry. Gas chromatography separates mixtures of compounds by passing them through a column with a stationary phase, where each component is adsorbed to varying degrees, and then the components are eluted from the column and detected.

Ethyl acetate and ethyl butyrate are two compounds that are commonly analyzed by gas chromatography. The compound that elutes faster is the one that is less strongly adsorbed to the stationary phase. The boiling point and polarity of the compound determine its strength of adsorption. Ethyl acetate has a lower boiling point than ethyl butyrate, and it is also more polar, so it is less strongly adsorbed to the stationary phase and elutes faster. Therefore, ethyl acetate is the component of the sample that elutes faster than ethyl butyrate. The answer to the question is ethyl acetate.

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