What is the pH of a 1.0L solution of 0.445 M hydrocyanic acid, HCN? (Ka = 4.0 x 10-10)
a. 3.516 b. 4.250 c. 4.602 d. 4.699 e. 4.875

Answer:

A new element

Explanation:

As you add mopre and more protons and electrons and neutrons it keeps on crating new.

Answer:

A

Explanation:

Electrolysis has to do with the decomposition of a solution by the passage of direct current through it. Current enters and leaves the electrolyte via electrodes.

The positive electrode is called the anode while the negative electrode is called the cathode. Positive ions move towards the cathode while negative ions move towards the anode.

Cu^2+ moves towards the cathode and accepts two electrons to be deposited on the cathode as metallic copper. Also, Cl^- ions move towards the anode and gives up electrons to become oxidized to chlorine gas.

Hence in the electrolysis of CuCl2, copper is obtained at the cathode while chlorine gas is obtained at the anode. Hence 1 and 3 are correct statements.

Answer:

Two similar atoms or different atoms

Explanation:

A molecule is made up of at least two similar atoms or different atoms.

A molecule is the smallest particle of a substance capable of independent existence.

Answer: Two similar atoms or different atoms.

Have a great day!

Answer:

0.005 moles of sulfuric acid are in the solution

Explanation:

The concentrations for the second, third, and fourth dilutions would be 0.3M, 0.03M, and 0.003M, respectively.

In a serial dilution, a concentrated solution is successively diluted to obtain solutions with lower concentrations. In this case, starting with a 30M sucrose solution, a series of four 1/10 dilutions are performed. The first dilution involves making 100 mL of the 1/10 dilution. To answer question 20, the calculation for the first dilution needs to be shown. For question 21, a diagram of the serial dilution with labeled volumes and concentrations of the stock and dilution beakers needs to be drawn. Finally, for question 22, the concentration calculations for each dilution step need to be provided.

To calculate the first dilution, we need to determine the concentration of the resulting solution. Since it is a 1/10 dilution, the concentration would be 1/10 times the original concentration. Therefore, the concentration of the first dilution would be 30M / 10 = 3M.

For question 21, a diagram needs to be drawn to illustrate the serial dilution process. The diagram should include the stock solution with a volume of 30M, the first dilution beaker with a volume of 100 mL and a concentration of 3M, and labels indicating the volumes and concentrations at each step of the dilution process.

For question 22, the concentration calculations for each dilution step need to be provided. Starting with the first dilution at 3M, subsequent dilutions would be 1/10 of the previous concentration. Therefore, the concentrations for the second, third, and fourth dilutions would be 0.3M, 0.03M, and 0.003M, respectively.

Overall, these calculations and the diagram represent the process and concentrations involved in the serial dilution of the 30M sucrose solution.


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It is better to prevent waste and pollution from occurring in the first place than to clean up or treat waste after it has been produced.

Chemical products should be designed to be as safe as possible for human health and the environment while still fulfilling their intended purpose.The use of auxiliary substances such as solvents and separation agents should be minimized or eliminated if possible, and safer alternatives should be used when necessary.Chemical processes should be designed to be as energy efficient as possible, and renewable energy sources should be used when feasible. Whenever possible, chemical feedstocks should be renewable, such as using biomass instead of fossil fuels.Energy is the ability to do work or cause change. It comes in many forms, including thermal (heat), electrical, chemical, mechanical, nuclear, and electromagnetic energy. Energy is a fundamental concept in physics and is closely related to the laws of thermodynamics, which describe how energy can be transformed from one form to another, but cannot be created or destroyed.There are many sources of energy that are used to power our daily lives, including fossil fuels (such as coal, oil, and natural gas), nuclear energy, renewable energy sources (such as solar, wind, hydro, and geothermal), and biomass (organic matter used as fuel, such as wood or plant waste).

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Answer: E=hv

Explanation: hope it helps

The equation that correctly relates the energy of electromagnetic radiation to its frequency is E = hν. The correct option is the last option \(E=h \nu\)

From the question, we are to determine the equation that correctly relates the energy of electromagnetic radiation to its frequency

NOTE: Energy increases as the wavength decreases and the frequency increases. That is, Energy varies directly with frequency.

If \(E\) reprensents the energy of electromagnetic radiation

and \(\nu\) represents the frequency

Then, we can write that

\(E \propto \nu\)

Now, introducing the proportionality constant, which is the Planck's constant \(h\)

We get

\(E=h \nu\)

Hence, the equation that correctly relates the energy of electromagnetic radiation to its frequency is E = hν. The correct option is the last option \(E=h \nu\)

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Answer:

atoms of the same element that have different masses due to their

varying numbers of neutrons

Explanation:

The mass number of an atom is the  sum of number of protons and number of neutrons. Whereas, charge is acquired by the lose or gain of electrons.

The atomic mass describes how much an atom weighs. The mass of an atom is usually take as relative mass where the mass of an atom is determined relative to the mass of carbon -12.

Mass number describes the sum of number of protons  and neutrons.  The mass of an atom is mainly contributed by the nucleus thats why take the ,mass number as its mass.

An atom gains positive charge when it loses one or more electron. For example hydrogen with 1 proton and no neutrons will lose its one electron and acquire a positive charge.

When an atom gains an electron it acquire a negative charge. Consider oxygen where 8 neutron and 8 electrons  (6 valence electrons) are there with a mass of 16 g/mol. It acquires 2 units of negative charge by gaining two electron. Since it needs two ore electron to attain octet.

Similarly a nitrogen atom with mass of 14 g/mol and 5 valence electrons acquire a -3 charge since it need 3 more electron to attain octet.

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The kinetic molecular theory of gases is a straightforward, historically significant classical model of the thermodynamic behavior of gases that laid the foundation for many key thermodynamic concepts.

The main points of the kinetic molecular theory are;

Thermal energy is the form of energy that exists in a system and controls its temperature. Heat is the form thermal energy takes.

Thermal conduction is the process by which quickly moving particles contact their nearby counterparts to transfer some of their kinetic energy. It is sometimes referred to as heat conduction. Areas with higher temperatures flow into areas with lower temperatures, causing this phenomenon.

Any system that doesn't interchange either energy or matter with its surroundings is said to be isolated.

A closed system only transfers energy to its surroundings.

Energy and matter can move freely between an open system and the outside world.

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Answer:

whole milk ,table salt , maple syrup

Answer:

d

Explanation:

Answer:

while organic chemistry is defined as the study of carbon, containing compounds and inorganic chemistry is the study of the remaining subset of compounds other than organic compounds there is overlap between the two fields (such as organometallic compounds,which usually contain a metal or metalloid bonded directly to.

Answer:

Birds and marine mammals are generally considered to be more vulnerable to oil spills because they are more likely to come into direct contact with the oil, either through exposure to the oil on the surface of the water or through ingestion of oil-contaminated prey. Birds may become coated in oil when they land on the water's surface to feed or rest, and marine mammals may be exposed to oil through inhalation or ingestion of contaminated water or prey.

Explanation:

Answer:

1. mercury.

2. suspensions.

3.iodine is the solute and alcohol is the solvent.

4. A element.

Answer: 1,480m/s

Explanation:

Answer:

kinetic energy

Explanation:

all moving objects have kinetic energy. when an object is an motion it changes its position by moving in a direction: up,down, forward, or backward

Answer: its C kinetic energy

Explanation: i did the test

Answer:

decomposition

Explanation:

feel free to follow me

Answer:

Sediment moves from one place to another through the process of erosion. Erosion is the removal and transportation of rock or soil. Erosion can move sediment through water, ice, or wind. Water can wash sediment, such as gravel or pebbles, down from a creek, into a river, and eventually to that river's delta.

Explanation:

Erosion refers to the washing away or the removal of top soils/rocks by agents such as water, wind, etc.

Erosion is the removal of topsoils or rocks by agents of erosions. These agents include water, wind, waves, and ice.

In water/ice erosion, topmost soils or rocks are washed away and deposited somewhere else, usually in or at the mouth of nearby water bodies.

Wind erosion carries soils/rocks and deposits them somewhere else. The deposition accumulates over a period of time to form different landforms.

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A 99.0 ml sample of 1.00 m NaOH is mixed with 49.5 ml of 1.00 m H₂SO₄ in a large styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temperature of each solution before mixing is 23.00 °c. after adding the NaOH solution to the coffee cup and stirring the mixed solutions with the thermometer, the maximum temperature measured is 31.50 °c. Assuming that the density of the mixed solutions is 1.00 g/ml, that the specific heat of the mixed solutions is 4.18 j/(g·°c), and that no heat is lost to the surroundings, the enthalpy of reaction is found to be 10.6 x 10⁻² kJ/mol.

The enthalpy change of the reaction can be calculated by using the mass of solution, temperature change, and specific heat of water when sodium hydroxide and sulfuric acid reacts.

The balanced chemical equation for the reaction is given as,

H₂SO₄(aq) + 2 NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l)

We know that,

volume of solution is 49.5 mL + 99.0 mL = 148.5 mL

Heat of the reaction can be given as - q = mcΔT

Mass of the solution, m = 148.5 x 1 g   = 148.5 g

                                                       1 mL

Specific heat, c = 4.18 J /g°C

Temperature change, ΔT = 31.50°C - 23.00°C = 8.5°C

Substituting values in equation,

q = 148.5 g x 4.18 J/g°C x 8.5°C = 5276.20 J

Now we will find moles,

Moles of NaOH = 0.99 mL x 1.00 M = 0.99 mol naOH

Moles of H₂SO₄ = 49.5 mL x 1.00 M = 49.5 mol H₂SO₄

Enthalpy of the reaction will be -

Enthalpy = 5276.20 J = 10.6 x 10⁻² kJ/mol

                   49.5 mol

Hence, the enthalpy is 10.6 x 10⁻² kJ/mol

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Replica plates on medium with glucose or tryptophan as the only energy source. You would look for colonies that can grow only on the plates with glucose

The turns, which separate the RNA transcript from the transcription bubble, are created by complementary base pairing. Genes that are constitutively expressed, or "housekeeping" genes, have the highest frequency of GbM, while genes with the most variable expression have the lowest frequency.

During transcription, the mRNA strand develops a hairpin loop that separates the RNA polymerase from the DNA template strand. The sequences involved in this process are referred to as terminator sequences, and the process is known as rho-independent or intrinsic termination.

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A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.

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Answer:

C! Hope this helps !:)

Explanation:

Answer:

Arrows pointing from the sun to the juice pop

Explanation: Trust I got it right

The value of Qc for the given solution is approximately 3.67425e⁻⁶.

To find the value of Qc (the reaction quotient) for the given solution, we need to determine the concentrations of the respective ions and use them to calculate Qc.

The balanced equation for the dissolution of lead(II) chloride (PbCl₂) in water is:

PbCl₂(s) ⇌ Pb²⁺(aq) + 2Cl⁻(aq)

From this equation, we can see that one mole of PbCl₂ dissociates to yield one mole of Pb²⁺ ions and two moles of Cl⁻ ions.

Given that the concentration of lead(II) nitrate (Pb(NO₃)₂) is 1.82e⁻⁴ M and the concentration of sodium chloride (NaCl) is 2.25e⁻² M, we can use the stoichiometry of the balanced equation to determine the concentrations of Pb²⁺ and Cl⁻ ions.

Since lead(II) nitrate dissociates completely, the concentration of Pb²⁺ ions is equal to the concentration of lead(II) nitrate:

[Pb²⁺] = 1.82e⁻⁴ M

Sodium chloride dissociates into one mole of Na⁺ ions and one mole of Cl⁻ ions. Since we're interested in the concentration of Cl⁻ ions, we'll use the given concentration of NaCl to calculate it:

[Cl⁻] = 2 * 2.25e⁻² M

      = 4.5e⁻² M

Now, we can write the expression for Qc using the concentrations of the respective ions:

Qc = [Pb²⁺][Cl⁻]²

Putting in the values we obtained:

Qc = (1.82e⁻⁴ M)(4.5e⁻² M)²

   = 1.82e⁻⁴ (20.25e⁻⁴)

   = 36.7425e⁻⁸  

Simplifying the expression:

Qc = 3.67425e⁻⁶

Therefore, the value of Qc for the given solution is approximately 3.67425e⁻⁶.

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Answer:

increase the rate of reaction.

Explanation:

Answer:

A. It leads to more frequent collisions, which increase reaction rate.

Explanation:

EDG

The value of K for the reverse reaction, in this case, would be 5 x \(10^{-6}\).

For a chemical reaction:

A + B ⇌ C + D

The equilibrium constant, K, is given by the ratio of the product concentrations to the reactant concentrations, with each concentration raised to the power of its stoichiometric coefficient:

K = [C]^c[D]^d / [A]^a[B]^b

where a, b, c, and d are the stoichiometric coefficients of the reactants and products, and [A], [B], [C], and [D] are their respective concentrations at equilibrium.

For the reverse reaction:

C + D ⇌ A + B

The equilibrium constant, K', is given by the same formula, with the concentrations of the products and reactants switched:

K' = [A]^a[B]^b / [C]^c[D]^d

Since the forward and reverse reactions are the same reaction, but in opposite directions, the equilibrium constants for the two reactions are related by the following equation:

K' = 1 / K

where K is the equilibrium constant for the forward reaction.

Step 1: Identify the equilibrium constant for the forward reaction (given in the question):

\(K_{forward}\) = 2.0 x \(10^{5}\)

Step 2: Calculate the equilibrium constant for the reverse reaction by taking the reciprocal of \(K_{forward}\):

\(K_{reverse}\) = 1 / \(K_{forward}\)

Step 3: Plug in the value of \(K_{forward}\) into the equation from Step 2:

\(K_{reverse}\) = 1 / (2.0 x \(10^{5}\))

\(K_{reverse}\) = 5.0 x \(10^{-6}\)

The value of K for the reverse reaction at the same temperature is 5 x \(10^{-6}\).

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Answer:

5x10-6

Explanation:

The noble gases have similar chemical properties because they have the same number of valence electrons.

The noble gases are the gases that are found in the last group of the periodic table. These are the gases that have been said to be unreactive under normal conditions. Thee have been found to react only under stringent conditions as we can see.

Given the fact that the octet rule states that an element that contains eight electrons in its outermost shell would be unreactive and all the noble gases have complete octets hence the noble gases are unreactive.

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As an electron-withdrawing group, the nitro group reduces the electron density over the benzene ring. Haloarenes are more reactive to nucleophlic substitution when nitro groups are present in the ortho or para position.

A reactant known as a nucleophile provides an electron pair in order to create a covalent bond. Typically, a nucleophile has a negative charge or is neutral with one or two donateable electrons. Some examples include H2O, -OMe, or -OtBu. The species with a lot of electrons is a nucleophile overall.

A nucleophile is an atom or molecule that seeks the positive center of a chemical process, such as the atom's nucleus, since it has an accessible electron pair for bonding.

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Answer:

Electron configuration can be carried out in two steps which can be:

Sublevel notation

Shell notations.

In the sublevel notation, the sequence of filling electrons into the orbitals of the sublevels are guided by some principles:

the maximum number of electrons in the orbital of sublevels are two for s-sublevel, six for p-sublevel, ten for d-sublevel and fourteen for f-sublevel. This indicates that the maximum number of electrons in an orbital is two.

Aufbau's prinicple states that sublevel with lower energies are filled up before those with higher energies.

Pauli exclusion principle states that no two electrons in an atom can have the same set of the four quantum numbers.

Hund's rule states that electrons go into degenerate orbitals singly first before pairing occurs.

Using the shell notation, numbers are used to denote the sum of electrons in all orbitals each energy level.

For an atom of Be:

Sublevel notation for the 4 electrons 1s²2s²

Shell notation 2,2

Other representation is using the electron dot structure.

Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.

Answer:

3 atoms

Explanation:

A water molecule consists of three atoms an oxygen atom and two hydrogen atoms which are bond together like little magnets