(g) if the experiment is repeated with the cu electrode replaced with a cu electrode with twice the mass, will the initial cell voltage be greater than, less than, or equal to the initial cell voltage in the original experiment? justify your answer.

The mass of 250 ml of water is 250 g.

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

mass = density × volume

Here,

density = 1 g/ml

volume = 250 ml

mass = 1 g/ml × 250 ml

         = 250 g

Therefore, the mass of 250 ml of water is 250 g.

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Answer:

1.09 moles

Explanation:

Sodium has a molar mass of 23 grams per mole. To get the number of moles of sodium, divide 25 grams by 23 grams per mole. The answer is 1.09 moles

Answer:

the greater the concentration of particles the lower the freezing point will be.

The number of atoms of 3.0 moles of the particle is  1.807 x 10²⁴ atoms K.

Avogadro's number, which is approximately 6.02 x 10^23 atoms per mole, is used to convert between the number of moles of a substance and the number of atoms (or molecules) in that substance.

Given that you have 3.0 moles of K (potassium), you can use Avogadro's number to calculate the number of atoms in 3.0 moles of K:

3.0 moles K x 6.02 x 10^23 atoms K/mole = 1.807 x 10²⁴ atoms K

So, the correct answer is 1.807 x 10²⁴ atoms K

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Answer:

Explanation:

its B 1mole

Iron and pure nickel can be differentiate by the it appearance as well as the density.

There are few property which can differentiate iron metal and pure nickel metal.

1)The density of iron= 7.87 \(gcm^{-3}\)

The density of pure nickel = 8.91  \(gcm^{-3}\)

2)The atomic number of iron = 26

The atomic number of nickel = 28

3)Appearance of iron = silver-grey metal

Appearance of pure nickel = silver -white metal.

Therefore, pure nickel and iron can be easily differentiate with the help of appearance and dansity.

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Sheets, tubes, and spheres are only possible when the atoms are connected by covalent bonds. In a network of SiO2, the atoms are connected by strong covalent bonds.

Which results in the formation of a three-dimensional network of tetrahedra. This network structure is responsible for the unique properties of pure silicates. The structures of pure silicates are poor lubricants due to the strong bonds between the atoms, which resist movement. They are also insulating because electrons are tightly bound to the atoms, making it difficult for them to move freely. However, some silicates may exhibit semi-conducting properties if they contain impurities or defects that allow for the movement of charge carriers.

When hydrogen is covalently bound to a highly electronegative element in each molecule of the substance, such as water, hydrogen bonds form between the molecules. Intermolecular bond forces include hydrogen bonds. They maintain a substance's molecular structure in a specific state of matter. They create bridges between molecules, not links between atoms. In the liquid, solid, and gaseous phases of matter, hydrogen bonds are present.

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The final temperature of the bomb calorimeter is 30.9°C.

Combustion reactions are those reactions in which a compound completly decompose in to carbon dioxide and water molecule.

The final temperature will be calculated by using the equation:

Q = mc(T₂ – T₁), where

Q = relesed heat from calorimeter = 24kJ = 24000J

m = mass of calorimeter = 1.30kg = 1300g

c = specific heat of calorimeter = 3.41 J/(g°C)

T₁ = initial temperature of calorimeter = 25.5°C

T₂ = final temperature of calorimeter = to find?

On putting all these values on the above equation and calculate for T₂, we get

T₂ = 24000/(1300)(3.41) + 25.5

T₂ = 30.9°C

Hence, correct option is (1) i.e. 30.9°C.

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Answer:

30.9

Explanation:

right on edge 2022

Answer:

It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs.

Explanation:

Answer:

Explanation:

The muscle that is contracted, it allows the lungs to fill with air through diaphragm muscle.

Hope it helped you.

The grams of magnesium hydroxide will precipitate if the 25 mL of 0.235 M magnesium nitrate are combined with the 30. 0 mL of 0.260 M potassium hydroxide is 0.227 g.

The reaction is given as :

Mg(NO₃)₂   +   2KOH  ---->  2KNO₃(aq)  +  Mg(OH)₂(s)

moles of Mg(NO₃)₂   = 0.235 × 0.025

                                  = 0.00587 mol

moles of KOH = 0.260 × 0.030

                        =  0.0078 mol

1 mole of Mg(NO₃)₂   react with 2 mole of KOH

mole of KOH = 0.0078 × 2

                      = 0.0156 mol

KOH is the limiting reagent.

2 mole of KOH  produces 1 mole of Mg(OH)₂

mole of Mg(OH)₂ =  0.0078 / 2 = 0.0039 mol

mass of Mg(OH)₂ = 0.0039 × 58.3

                             = 0.227 g

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By subjecting the two compounds to Jones reagent, you can observe the difference in their reactivity and determine the compound that undergoes oxidation (4-methyl-3-penten-1-ol) and the one that does not (1-methoxy-3-methyl-2-butene).

To distinguish between 1-methoxy-3-methyl-2-butene and 4-methyl-3-penten-1-ol, you can use an oxidizing agent that can react selectively with the alcohol group present in 4-methyl-3-penten-1-ol.

One suitable reagent for this purpose is Jones reagent (a mixture of chromic acid and sulfuric acid). Jones reagent is a strong oxidizing agent that can convert alcohols to their corresponding carbonyl compounds (aldehydes or ketones).

Here's what would happen with each compound:

Methoxy-3-methyl-2-butene does not have an alcohol group, so it would not react with Jones reagent.

4-Methyl-3-penten-1-ol has an alcohol group, and it can be oxidized by Jones reagent to form the corresponding aldehyde or ketone. The specific product obtained would depend on the reaction conditions.

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Answer:

Try asking a friend or teacher

Explanation:

helps better than this site because alot of the answers are different even though they might of had the same test

geothermal energy, form of energy conversion in which heat energy from within Earth is captured and harnessed for cooking, bathing, space heating, electrical power generation, and other uses.

Answer:

it can use for you wanted to do and we can use it for our wants...

Explanation:

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BTS

Answer:

1=B

2=A

3=A

Explanation:

Any subsatance with a ph of less than 7 is acidic.

Bases measure over 7

The compound considered to be "free" chlorine in its present state is chlorine gas (Cl2).

Chlorine gas (Cl2) is the only compound listed that consists solely of chlorine atoms. It exists as a diatomic molecule, with two chlorine atoms bonded together through a covalent bond. In this form, chlorine is in its elemental state and is commonly referred to as "free" chlorine.

On the other hand, sodium hypochlorite (NaOCl), calcium hypochlorite (Ca(ClO)2), potassium hypochlorite (KClO), and HOCl (hypochlorous acid) are all compounds that contain chlorine but are chemically bonded with other elements.

Sodium hypochlorite, calcium hypochlorite, and potassium hypochlorite are examples of hypochlorites, which are chlorine compounds commonly used as disinfectants or bleaching agents. These compounds release hypochlorous acid (HOCl) when dissolved in water, which is an effective oxidizing agent with antimicrobial properties.

HOCl, also known as hypochlorous acid, is a weak acid that is formed when chlorine gas dissolves in water. It is the active form of chlorine in many disinfectants and sanitizers, including bleach. While HOCl contains chlorine, it is not considered "free" chlorine in the same sense as chlorine gas (Cl2).

In summary, among the listed compounds, only chlorine gas (Cl2) is considered to be "free" chlorine in its present state.

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Explanation

Given:

ΔG° = 13.8 kJ/mol = (13.8 x 1000) J/mol = 13800 J/mol

Temperature, T = 25.0°C. = 25.0°C + 273 = 298.0 K

What to find:

the value of the equilibrium constant, K for the reaction at 25.0°C.

Step-by-step solution:

Both K and ΔG° can be used to predict the ratio of products to reactants at equilibrium for a given reaction.

ΔG° is related to K by the equation ΔG°= −RTlnK.

R is the molar gas constant, ( R = 8.3144598 J/K/mol)

If ΔG° < 0, then K > 1, and products are favored over reactants at equilibrium.

The next step is to substitute the values of ΔG° and T into the equation to get K.

ΔG°= −RTlnK

13800 J/mol = -(8.3144598 J/K/mol x 298 K x lnK)

13800 J/mol = -(2477.70902 J/mol x lnK)

Divide both sides by 2477.70902 J/mol

The ΔG'° for the hydrolysis of acetyl-CoA is -30.3 kJ/mol.

Reaction 1

ΔG'°: Oxaloacetate + acetyl-CoA + H2O → citrate + CoASH = -32.2 kJ/mol

Reaction 2

ΔG'°: Oxaloacetate + acetate → citrate = -1.9 kJ/mol

The ΔG'° for the hydrolysis of acetyl-CoA can be calculated using the Gibbs free energy equation and the given ΔG'° values for the two reactions. The equation is:
ΔG'° = ΔG'° (reaction 1) - ΔG'° (reaction 2)

Plugging in the given values, we get:
ΔG'° = (-32.2 kJ/mol) - (-1.9 kJ/mol)
ΔG'° = -30.3 kJ/mol

Therefore, the ΔG'° for the hydrolysis of acetyl-CoA is -30.3 kJ/mol. This means that the reaction is exergonic and will proceed spontaneously under standard conditions.

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Answer:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

(if this help pls mark as brainliest :))

Answer:

Number of protons

Explanation:

Isotopes are the same atom of an element with same

number of protons but different number of Neutrons.

a molecule is the smallest particle of a compound is still has the compounds property it consists of two or more atoms bonded together

Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.

Answer:

the answer is salmonella

Answer:

Fossil fuel

Explanation:

Answer:

2

Explanation:

Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs.

Answer:

hello your question is incomplete below is the missing part of the question

A biochemist performs an experiment to study the behavior of water molecules near proteins. He concludes that water molecules occur in groups of five in the presence of proteins.

answer : Ensure that his conclusion is supported by evidence.

Explanation:

Skepticism during the conduction of an experiment is an act/trait that a scientist possess that will make him/her repeat an experiment for the purpose of verifying the data gotten from the previous experiment

hence the answer to the question is to Ensure that his conclusion is supported by evidence.

The charge qₑₙ contained within the Gaussian cylinder is equal to the net charge enclosed by the cylinder.

In the context of Gauss's Law in electromagnetism, a Gaussian cylinder is an imaginary surface used to apply the law. Gauss's Law states that the electric flux through a closed surface is proportional to the net charge enclosed by that surface.

The charge qₑₙ enclosed within the Gaussian cylinder can be determined by calculating the integral of the electric field over the surface of the cylinder. This integral represents the electric flux passing through the surface, which is proportional to the net charge enclosed.

To find the value of qₑₙ, you need to evaluate the integral of the electric field over the surface of the Gaussian cylinder. The result will be the net charge enclosed by the cylinder.

By using Gauss's Law and properly considering the symmetry and characteristics of the electric field, you can determine the charge qₑₙ enclosed within the Gaussian cylinder for a given distribution of charges.

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The correct option is option (C) i.e., Absolute dating techniques are

Dating techniques:

Dating technique is the procedure scientists use to determine the age of rocks, fossils, and artifacts. Relative dating only tells you whether one sample is older or younger than another. Absolute dating gives an approximate date for the year. Some scholars prefer the term absolute dating or calendar dating because the use of the word "absolute" implies an undue certainty of accuracy. Although numbers are given, relative dating orders events without measuring ages between them.

Absolute Dating Methods include:

Therefore, the correct answer to the given question is option C, i.e. H. Dendrochronology; Radiocarbon; Potassium/Argon.

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Answer:

Salt water

Explanation:

Salt water

I don't really know how to explain it but you need things to make salt water, all you really need is salt and water. Hope I help if I didn't then I'm very sorry for wasting your time.

This structure is incorrect because the octet rule is not fulfilled.

Lewis formulated the "octet rule" in his atom theory. The octet rule generally refers to the tendency of atoms in order to have eight electrons in the valence shell. When the atoms have fewer than eight electrons, they tend to react with other atoms and form more stable compounds. Usually atoms will react to get in the most stable state possible that is will try to satisfy the octet rule.

To find if octet is satisfied first we need to  determine the number of electrons from lone pairs and bonds to the atom. Each lone pair will donate  two valence electrons to the atom and each bond is represented by a line, gives two valence electrons to the atom. Second we need to confirm that the added up number of valence electrons is 8, or 2 for hydrogen.

In case of CO2 we can see that the octet rule is not satisfied so its the wrong structure.

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Answer:

137.18mL

Explanations:

To get the required volume, we will use the dilution formula expressed as:

C1 and C2 are the concentration of the solution

V1 and V2 are the corresponding volumes

Given the following parameters:

Substitute the given parameters into the formula:

Hence the required volume of KCL that must be diluted to make 825 milliliters of a 0.705 M KCl solution is 137.18mL

Answer:

The formula of the precipitate formed is AgN₃ (Silver azide).

On adding aqueous ammonia to the precipitate formed, the precipitate dissolves due to the formation of a soluble complex compound with aqueous ammonia.

Explanation:

Sodium azide is NaN₃

Silver Nitrate is AgNO₃

The two of them react and theres a double displacement where the ions exchange radicals.

NaN₃(aq) + AgNO₃(aq) → NaNO₃(aq) + AgN₃(s)

The azide ion (N₃⁻), which has very similar chemical properties as the chloride ion (Cl⁻), also forms an insoluble compound with Silver.

And just like AgCl, the precipitate (AgN₃) also dissolves when ammonia is added by forming a soluble complex.

AgN₃(s) + 2NH₃(aq) → [Ag(NH₃)₂]N₃(aq)

Hope this Helps!!!

Answer:

Explanation:

This is just a ratio question. Factor of increase = 27.2 / 3.20 = 8.50