question content area stirring a solute into a solution increases the net dissolving rate (reduces the dissolving time to reach equilibrium) because the ...

Answer:

C) lattice of neutral atoms with delocalised electrons

Explanation:

Fact 1: metals are elements and therefore they contain atoms that are electrically neutral

Fact 2: in all atoms, the electrons are delocalised/ are free moving electrons (as the electrons serve their purpose in different forms depending whether you look at it the chemistry way or physics way)

metals are solid and hence they have a lattice structure

(tho at my school we focus on giant ionic lattice structure when explaining based on ionic compounds so i can't guarantee that 'giant ionic lattice structure' and 'lattice structure' are the same, hence i just stick with lattice structure for this explanation ^^)

explanation for other options:

they said negative/positive ions which is not true since atoms are electrically neutral

only when the atoms undergo chemical reactions will they be charged

so, to calculate the molar of the monoprotic weak acid ;

first, we write the reactions

HA +NaOH → NaH +H20

42.0ml NaOH ( 1l NaOH / 1000 ml NaoH ) (0.250 m/ 1l NaOH) (1 mol HA/ 1 mol NaOH)

0.0105 moles HA

now, we calculate the molar mass

molar mass= mass/ moles

                   = 0.483 grams/ 0.0105 moles

                   = 46 grams/moles

the molar mass of the monoprotic weak acid is 46grams/moles

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162 grams of water have the same no. of oxygen atoms as 9.0 mol of oxygen gas.

1 mol of oxygen contains 6.023 * 10 [23] oxygen atoms.

That means 9.0 mol of oxygen gas is equals to 9*6.023*10[23] oxygen atoms .

To calculate the grams of water which will have 9*6.023*10[23] atoms of oxygen.

We have to know that in 18gms of water 1 oxygen atom is present.

So, for 9 oxygen atoms we will multiply with 18 that is 162 gms.

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1. Marie could test if the beads she collected were metals by seeing if they conducted electricity or by adding it to a dilute acid to see if hydrogen gas is evolved.

2. Since the reaction involved a metallic oxide, lead oxide, the metal would most probably be Lead.

3. The element that is combined with carbon in carbon dioxide is oxygen.

4. The element oxygen in this experiment comes from lead oxide.

5. Marie should wear goggles as a piece of safety equipment in this experiment.

Metals are shiny hard substances that form positive ions by the loss o electrons.

Some properties of metals include;

Lead is an example of metal whereas lead oxide is a compound of lead and oxygen.

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Alpha particles are the only radioactive particle that could have been used in the Rutherford gold foil experiment because they are produced naturally by radioactive nuclides that are alpha emitters and so a steady supply was easy to obtain.

As alpha particles do not travel very far from their radioactive source. They cannot pass through a piece of paper, clothes, or even the layer of dead cells which normally protects the skin.

Rutherford used alpha particles in his gold foil experiment in part because his previous research on radioactive decay discovered alpha particles. He wanted to test how alpha particles, which are positively charged, would react with various forms of matter.

Therefore Rutherford uses alpha particles in the Rutherford gold foil experiment.

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Answer:

Water and CO2

Explanation:

These are both materials that are used in the process of photosynthesis that can be acquired from the around the plant, and the rain, which are natural raw materials that can be found anywhere in nature.

-Hope this helped

When performing a presumptive blood test with Hemastix, the reason why it necessary to test an unstained area close to the bloodstain under examination as a control is that the likelihood that there is presence of blood, and thus need confirmatory test in lab to know if it is actually blood.

Hemastix reagent strips were initially created for the purpose of detecting blood in urine. It has been determined that this quick and simple test is useful as a presumptive test for the presence of blood.

Note that the presence of a chemical in a sample can be determined or confirmed using a presumptive test, which is a qualitative study. These decisions are typically made following a chemical reaction that results in the production of a certain color. A false positive occurs when a different chemical reacts similarly and yields the desired outcome.

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0.79 gram is the mass of methane that will occupy the same volume as 0.0325 mol of propane at 1.00 atm 1.00 atm and 298 k.

The atmosphere contains small amounts of the gas known as methane. The simplest hydrocarbon is methane, which only has one carbon atom and four hydrogen atoms. Strong greenhouse gas methane is. Numerous anthropogenic (influenced by humans) and natural sources release methane into the atmosphere. Landfills, natural gas and oil pipelines, industrial processes, mining for coal, stationary and mobile combustion, wastewater treatment, and certain agricultural practises are examples of anthropogenic emission sources. propane primary applications include heating homes and water, preparing and storing food, driers for clothing, and industrial and farm machinery. Propane is also used as a raw material in the chemical industry to create plastics and other compounds.

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An generally pro of HBr results in a molecule called halohydrin in this process. The oxygen carrier in the epoxide will be protonated by the hydrogen, and then the bromide ion will attack the more.

Stereochemistry is the study of a material's four structural elements. The location of the particle's electrons in 3 dimensions is the only structural distinction between the enantiomers known as cis and trans isomers. There may be differences in the physicochemical characteristics of these stereoisomers.

Chemists can determine the connections between several molecules consisting of the same atoms by using stereochemistry. They can also research how these linkages affect the physical and biological characteristics that molecules possess.

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The mass of the products form when baking soda decomposes is 25.00 grams

We can determine the mass of the products formed by simply observing the law of conservation matter (mass). Details below

The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Thus, for every balanced chemical equation, total mass of reactants must equal to the total mass of the product obtained.

With the above information, we can detertmine the mass of the products obtained as follow:

2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

Mass of reactant = Mass of product

Mass of NaHCO₃ = Mass of (Na₂CO₃ + H₂O + CO₂)

25.00 g = 25.00 g

Thus, the mass of the products is 25.00 g

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So an atom with a radius of 50 kilometers would be required for a nucleus that was 1 meter in size.

The nucleus is the center of the cell and contains the DNA and other structures that contain the genetic material (such as growth and metabolism). Inside the nucleus, tiny structures known as nucleoli are frequently seen. The gel-like structure within which nuclear components are hung is known as the cell nucleus.

When one look at a photograph of a cell, one of the parts that stands out the most is the nucleus. The nucleus, located at the center of the cell, is home to all of the chromosome, which are responsible for encoding the genetic material. The nuclear envelope, nucleolus, nuclear matrix, nucleosome, and nucleolus are some of the several structures that make up the nucleus.

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If 17 grams of silicon are required, then 7.2 grams of Mg are needed to react.

The balanced chemical equation of the reaction of SiCl₄ and Mg is,

SiCl₄ + 2Mg → Si + 2MgCl₂

So, as we can see from the reaction,

2 moles of Mg reacts, it forms one mole of silicon.

We know,

Moles = Mass/molar mass

we can write,

2 moles of Mg = mole of Si

2 x mass/molar mass = mass/molar mass

Molar mass of Si is 28 g/mol.

Molar mass of Mg is 24 g/mol.

The mass of Silicon required is 17 grams.

Putting the values,

2 x mass/24 = 17/28

Mass of Mg required is 7.2 grams.

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189.8 mol of O₂ are required to react completely with 10.6 moles of butane.

An accident occurred when the Hindenburg, an airship filled with hydrogen, tried to land in New Jersey in 1937. 36 persons were killed when the airship was destroyed and the hydrogen instantly exploded in a massive explosion. The chemical process was straightforward: water was created when hydrogen and oxygen combined.

A hydrocarbon, a substance comprised only of carbon and hydrogen, is involved in numerous combustion reactions. Carbon dioxide and water are the byproducts of the burning of hydrocarbons. Since their combustion produces more amounts of heat energy, many hydrocarbons are use fuel. Gas grills frequently use propane (C3H8) as their fuel source. Propane is a gaseous hydrocarbon.

Reaction is:

C₄H₁₀ + [tex]\frac{13O_{2} }{2}[/tex] → 4CO₂ + 5H₂O

Given,

no. moles of butane = 29.2 mol

from the balanced chemical equation,

we can say that:

1 mol of C₄H₁₀ requires [tex]\frac{13}{2}[/tex] moles of O₂

29.2 mol of C₄H₁₀ requires [tex]\frac{13}{2}[/tex] × 29.2

⇒189.8 mol of O₂

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amount of bromoacetic acid = 22.2 grams

amountof sodium bromoacetate = 6.47 grams

Total concentration = 0.200 M

[CH2BrCOOH] + [CH2BrCOONa] = 0.200 M     ...(1)

Ka = 2.00 x 10-3

pKa = -log(Ka)

pKa = -log(2.00 x 10-3)

pKa = 2.70

According to Henderson - Hasselbalch equation,

pH = pKa + log([conjugate base] / [weak acid])

2.100 = 2.70 + log([CH2BrCOONa] / [CH2BrCOOH])

log([CH2BrCOONa] / [CH2BrCOOH]) = 2.100 - 2.70

log([CH2BrCOONa] / [CH2BrCOOH]) = -0.60

[CH2BrCOONa] / [CH2BrCOOH] = 10-0.60

[CH2BrCOONa] / [CH2BrCOOH] = 0.252      ...(2)

Solving equations (1) and (2)

[CH2BrCOOH] = 0.160 M

[CH2BrCOONa] = 0.040 M

moles CH2BrCOONa = (molarity CH2BrCOONa) * (volume of buffer in Liter)

moles CH2BrCOONa = (0.040 M) * (1.00 L)

moles CH2BrCOONa = 0.040 mol

mass CH2BrCOONa = (moles CH2BrCOONa) * (molar mass CH2BrCOONa)

mass CH2BrCOONa = (0.040 mol) * (160.93 g/mol)

mass CH2BrCOONa = 6.47 g

moles CH2BrCOOH = (molarity CH2BrCOOH) * (volume of buffer in Liter)

moles CH2BrCOOH = (0.160 M) * (1.00 L)

moles CH2BrCOOH = 0.160 mol

mass CH2BrCOOH = (moles CH2BrCOOH) * (molar mass CH2BrCOOH)

mass CH2BrCOOH = (0.160 mol) * (138.95 g/mol)

mass CH2BrCOONa = 22.2 g

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Sleet ,freezing of raindrops, snowflakes Precipitation

are 4 non examples of condensation .

What is condensation ?

Condensation, the separation of a liquid or solid from a vapor, generally occurs on surfaces that are cooler than the adjacent gas. A substance condenses when the pressure exerted by that vapor exceeds the vapor pressure of the substance's liquid or solid phase at the temperature of the surface on which condensation is occurring. As the steam condenses, heat is released. If this heat is not removed, the surface temperature will rise until it matches the surrounding steam.

If the air does not contain small particles, so-called aerosols, condensation will only occur if the air is extremely supersaturated with water vapor.

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Oxygen is the final electron acceptor after the electron has moved through the electron transport chain.

In the electron transport chain, electrons are moved from protein to protein. The transport chain's succeeding proteins can each take an electron with a lower energy. Energy is released as electrons go from a high-energy state to a low-energy state. Protons are pumped across the membrane using this energy to create a gradient.

Oxygen serves as the ultimate electron acceptor (O2). Since oxygen has a strong affinity for electrons and a high electronegativity.

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After passing through the cycle of electron transport, oxygen serves as the last electron acceptor.

From protein to protein, electrons are transferred along the electron transport chain. The proteins that follow in the transport chain can each accept an electron with a lower energy. Electrons move from a high-energy state to a low-energy state, releasing energy in the process. This energy is used to drive protons across the membrane, producing a gradient. As the ultimate electron acceptor, oxygen (O2). A high electronegativity and significant attraction for electrons are seen in oxygen.

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Copper(II) sulfate is pale blue (cyan) because it absorbs light in the red region of the spectrum.

Spectrophotometry is the branch of electromagnetic spectroscopy that deals with the quantitative measurement of reflectance or transmission properties of materials as a function of wavelength.

A method of measuring how much light a chemical absorbs by measuring the intensity of light as it passes through a sample solution. The basic principle behind spectrophotometry is that each compound absorbs or transmits light in a specific wavelength range.

Copper(II) sulfate solution appears blue because it actually absorbs red region of spectrum which is a complementary color of blue.

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The statements that best describe Bridget's recorded observations are:

1 A television is a device that converts electrical energy into heat and light energy.

2 Electrical energy may be converted into other types of energy.

3 Sound energy is created by combining heat and light energy.

4 Electrical energy may be converted into motion energy.

Energy transfer is the process of transferring energy from one system to another, such as by heat, work, or mass transfer.

Energy is required for living organisms to grow, breathe, reproduce, and move. Because energy cannot be created from a vacuum or a void, it must be transported via the biosphere. The sun is the principal source of energy for practically every ecosystem on Earth.

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Full Question:

Bridget performed an investigation to determine if a television set transformed electrical energy into other types of energy. She recorded her observations in a table. What statement best describes the results?

Question Observation

Does it transform into heat energy?

Does it transform into light energy?

Does it transform into sound energy?

Does it transform into energy of motion?

The answer is 4.02.

Benzoic acid is a weak acid and sodium hydroxide is a strong base. Benzoic acid and sodium hydroxide react to form sodium acetate and water to form a buffer solution. pH can be measured by measuring the voltage developed between two special electrodes immersed in a liquid solution.

Special glass electrodes are called measuring electrodes. It neutralizes benzoic acid to produce benzoate ions, which enter the water layer, leaving two other organic compounds in the ether. Similarly, nitroaniline does not dissolve under neutral or basic conditions but dissolves in acidic solutions. This clearly shows that formic acid is a stronger acid than benzoic acid.

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Bones are classified into Five according to shape namely: Long bones, short bones, flat bones, iregular bones, sesamoid bones.

These are living tissues that contain their own blood vessels and are comprised of different cells, proteins, minerals, and vitamins. They make up the body's skeleton.

Bone classification according to shape:

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The electronic configuration packing patterns of some elements in group 6b(6) and group 1b(11) reflect the enhanced stability of half-filled and fully-filled sublevels. So option (c) is correct.

The electronic configuration of an element describes how the electrons are distributed in its atomic orbitals. For example, the electron configuration of sodium is 1s²2s²2p⁶3s¹

The three rules that direct the manner in which electrons are to be filled in atomic orbitals are:

Aufbau principle: Electrons must completely fill the atomic orbitals of a given energy level before occupying an orbital of a higher energy level. Electrons fill orbitals in the increasing order of orbital energy level.

Pauli’s exclusion principle: It states that two electrons can never have equal values for all four quantum numbers. Also each subshell of an orbital can have a maximum of 2 electrons and both these electrons must have opposite spins.

Hund’s rule of maximum multiplicity: The subshells in an orbital must be singly occupied before it is doubly occupied. Furthermore, the spin of all the electrons in singly occupied subshells should be the same (to maximize the overall spin).

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By finding the serial fraction, we arrive to the aforementioned Karp-Flatt metric.

A measure of code parallelization in systems with parallel processors is the Karp-Flatt metric. This metric exists in addition to Amdahl's law and Gustafson's law as a measure of the level of parallelization of a specific computer code. In 1990, Horace P. Flatt and Alan H. Karp made the suggestion.

The effectiveness of a parallel algorithm operating on a parallel processor can be evaluated in a variety of ways. The Karp-Flatt metric identifies a statistic that highlights performance characteristics that are difficult to identify from other metrics. Amdahl's Law has the following pseudo-"derivation," .

Note that the left hand side reflects a metric quantity rather than a quantity that was derived mathematically, indicating that this is not a "derivation" from Amdahl's law. The analysis above only demonstrates that the Karp-Flatt measure and Amdahl's Law are compatible.

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The number of mole of air in the ball, given that the volume of the ball is 5.2 litres is 0.13 mole (Option A)

We'll begin by listing out the given parameters from the question. This is given below:

From the above parameters, we can obtain the number of mole as follow

PV = nRT

61 × 5.2 = n × 8.314 × 305

317.2 = n × 2535.77

Divide both sides by 2535.77

n = 317.2 / 2535.77

n = 0.13 mole

Thus, the number of mole is 0.13 mole (Option A)

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1) The species oxidized shows a(n) = increase in oxidation number.

2) The species reduced shows a(n) = decrease in oxidation number.

3) The species that shows a decrease in oxidation number is the = oxidizing agent.

4) The species that shows an increase in oxidation number is the = reducing agent.

The degree of biological activity controls both the formation of zones where specific redox processes predominate and the progression of environmental redox reactions. Anoxia, which are situations when the concentration of dissolved molecular oxygen is extremely low, is a requirement but not a sufficient condition for lowering conditions. The active microbial population shifts from communities that depend on aerobic respiration, in which molecular oxygen serves as the terminal electron acceptor, to anaerobic respiration, in which other chemical substances take the place of molecular oxygen as the terminal electron acceptor supporting respiration, as a result of the development of anoxia.

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2 liters of chlorine gas react to produce 2 l of hydrogen chloride gas

We may think about STP.

Gaseous hydrogen chloride in 2 L

PV = nRT

P = 1 atm

V = 2L

n = ?

R = Gas Constant, or 0.0821 L atm K-1 Mol-1.

T = 273

enter and find n in the equation

1 x 2 = n x 0.0821 x 273

n = 08923 mole

An comparable amount of Cl2 gas is required for every 0.08923 mole of hydrogen chloride gas (0.08923 = 0.044615 mole).

as a result, volume of 0.044615 mole of Cl2

P = 1 atm V =?n = 0.044615" T = 273

1 x V = 0.044615 x 0.0821 x 273

V = 1 Lit

Hence Chlorine gas must react to create hydrogen chloride gas, which requires a reaction volume of 2 L.

provide the same amount of 2 Liter

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The new concentration results in 0.512 M.

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

Calculation:-

final conc=m1v1+m2v2/(v1+v2)

final conc=209 × 0.71+407 ×0.41/(407+209)

final conc = 0.512 M

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

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The molarity of the solution is 0.95M and the concentration of the Silver cation and the concentration of the acetate anion is also 0.95M.

The mass of the Silver Acetate dissolved in the water of volume 125 ml is 20 grams.

We can write the reaction of the dissolution of the Silver Acetate into water as,

CH₃COOAg = CH₃COO- + Ag+

It means that the concentration of the Silver cation and the Acetate anion is equal in the solution of water.

It means that the molarity of the solution will be equal to the concentration of the Silver cation and the concentration of the Acetate and iron in the water.

We know that the molarity of the solution is defined as the number of moles of solute per unit volume of the solution in litres.

Moles = mass/molar mass

Molar mass of the Silver Acetate is 166.91 g/mol.

The mass of silver Acetate dissolved is 20 grams.

So, the moles of silver Acetate is,

Moles = 20/166.91

Molarity of the solution,

Molarity = moles of silver acetate/volume of water

Molarity = 20/166.91 × 1000/125

Molarity  = 0.95

So, the molarity of the Silver Acetate solution is 0.95M.

The concentration of the Silver cation and the concentration of the Acetate anion will be same as that of the molarity of the solution.

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The number of moles of aluminum that neutralizes the antacid is 7.95 moles.

An antacid is a substance that neutralizes the acidity in our stomach. Antacid contains substances like aluminum, magnesium and etc. It makes the pH alkaline when the pH drops below the required amount.

    According to the given condition, aluminum hydroxide reacts with hydrochloric acid.

Al(OH)3 + 3Hcl - Alcl3 + 3 H2O.

      Here, 1 mole of aluminum hydroxide reacts with 3 moles of hydrochloric acid.

Therefore, 2.65g will react with 3/1 moles.

Therefore, 3/1 x 2.65 = 7.95 moles.

Complete question: -

Some antacid tablets contain aluminum hydroxide. The aluminum hydroxide reacts with stomach acid according to the equation: AI(OH)3 +3HCIAICI, +3H2O. Determine the moles of acid neutralized if a tablet contains 0.200 mol of Al(OH)3

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Answer:

D

Explanation: