imagine that you go into the lab and perform a titration. you measure 40 ml of your analyte and add it to an erlenmeyer flask. to this you add three drops of an indicator solution that will change color from clear to blue. into your burette you add 50 ml of a 1.8 m standard titrant solution that reacts with your analyte in a 1:1 mole ratio. you do the titration and find that after you have added 26 ml of standard, the solution in your erlenmeyer flask turns blue. what is the original concentration of your analyte solution?

Answer:

40

Explanation:

300÷15=20

20×2=40

hope this helps

Answer:

300(2)

Explanation:

given:

2 sticks of butter

how much butter if 300

multiply it

In an experiment comparing the tension bond strength of polymer latex modified mortar (portland cement mortar with added polymer latex emulsions) to that of unmodified mortar, the result was x.

To conduct this experiment, you would need to follow these steps:

1. Prepare the materials: Gather all the necessary materials, including polymer latex emulsions, portland cement, sand, water, and any other additives required for the mortar mixture.

2. Prepare the polymer latex modified mortar: Mix the portland cement, sand, water, and polymer latex emulsions according to the specified proportions. Ensure thorough mixing to achieve a homogeneous mixture.

3. Prepare the unmodified mortar: Mix the portland cement, sand, and water according to the specified proportions. Again, ensure thorough mixing for a consistent mixture.

4. Perform the tension bond test: Apply both the polymer latex modified mortar and the unmodified mortar onto separate test surfaces, such as concrete blocks or metal plates. Make sure the surfaces are clean and free from any contaminants.

5. Allow the mortar to cure: Let both the modified and unmodified mortar cure for a specific duration, following the manufacturer's instructions or established industry standards.

6. Test the bond strength: Use a tension bond strength test apparatus, such as a hydraulic or mechanical testing machine, to apply a force perpendicular to the bond interface of the mortar. Apply increasing force until the bond fails and records the maximum force required for bond failure in both cases.

7. Compare the results: Analyze the data obtained from the tension bond test for both the polymer latex modified mortar and the unmodified mortar. Determine the maximum force or stress required for bond failure in each case.

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Answer:

Yes, gold can be created from other elements. But the process requires nuclear reactions, and is so expensive that you currently cannot make money by selling the gold that you create from other elements. ...

Explanation:

Answer:

D

Explanation:

Before it can be used in a reactor for electricity generation, however, it must undergo a series of processes to produce a useable fuel. For most of the world's reactors, the next step in making the fuel is to convert the uranium oxide into a gas, uranium hexafluoride (UF6), which enables it to be enriched.

Unstable U-235 must be enriched with 5% U-238 to stabilize it.​ Hence, option D is correct.

Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei into atomic nuclei to form more energetically stable atomic nuclei.

Before uranium can be used in a reactor for electricity generation, however, it must undergo a series of processes to produce a useable fuel.

For most of the world's reactors, the next step in making the fuel is to convert the uranium oxide into a gas, uranium hexafluoride (UF6), which enables it to be enriched.

Hence, option D is correct.

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Considering the definition of STP conditions and Avogadro's Number, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of methane, then 5.25×10²² molecules are contained in how many moles of methane?

amount of moles of methane= (5.25×10²² molecules × 1 mole)÷ 6.023×10²³ molecules

amount of moles of methane= 0.087165 moles

There are 0.087165 moles of methane in 5.25×10²² molecules.

You can apply the following rule of three: if by definition of STP conditions 1 mole of methane occupies a volume of 22.4 liters, 0.087165 moles occupies how much volume?

volume= (0.087165 moles× 22.4 L)÷1 mole

volume= 1.952496 L

Finally, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

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Explanation:

19.9924×90.48/100+20.9938×0.27/100+21.9914×9.25/100

=20.1800 average amu

Answer:pH decreases pH = about 8.9

Explanation:

Answer:Yes. Adding or losing neutrons will change the atomic mass without forming a different element.

Explanation: Brainly

The entropy  is -3.65 and -0.049 J per kelvin per mole respectively are the entropy of an insulated tank.

Entropy is a measure of randomness in a system. It is a state function. It can be denoted by heat supplied for a reversible system per temperature.

The final pressure will be the partial pressure of each gas in the mixture.

a) Partial pressure of nitrogen = mole fraction of nitrogen x total pressure = (0.79 mol) × (1 + 1 bar)/(0.79 + 0.29 mol) = 1.46 bar

Partial pressure of oxygen = mole fraction of oxygen x total pressure = (0.29 mol) ×(1 + 1 bar)/(0.79 + 0.29 mol) = 0.54 bar

Therefore,

ΔS of nitrogen= -R ln1.46 = -0. 38R

∆S of oxygen= -R ln 0.54= -0. 61R

ΔSuniv=−(0.79mol/0.79+0.29mol)×0.38 R−(0.29mol/0.79+0.29mol)×0.61

R=−0.27 R−0.16

R=−0.44

R=−3.65JK−1mol−1

(b) Partial pressure of nitrogen = mole fraction of nitrogen x total pressure = (0.79 mol) × (2 + 1 bar)/(0.79 + 0.29 mol) = 2.19 bar

Partial pressure of oxygen = mole fraction of oxygen x total pressure = (0.29 mol) × (2 + 1 bar)/(0.79 + 0.29 mol) = 0.80 bar

ΔS of nitrogen gas=−Rln1.46=−0.09R

ΔSof sulphur oxide =−Rln0.54=0.22R

ΔSuniv=−(0.79mol/0.79+0.29mol)×0.09R+(0.29mol/0.79+0.29mol)×0.22

R=−0.066 R+0.060

R=−0.049JK−1mol−1

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Pulp

distillation

chromatography

Acetone is captured and cooled.

Substance A is rice, and substance B is sugar.

To separate the components of a mixture the substances to be separated must differ in a given physical property.

In chemistry, there are diverse separation techniques used to separate the components of a mixture. Separation depends on differences in a given physical property such as boiling point, solubility in a solvent, difference in particle size etc.

Filtration can be used to separate a solid from a liquid hence it can be used to separate pulp from orange juice.

To separate water and alcohol, distillation is used because such a separation depends on the difference in the boiling points of water and alcohol. Water boils at a higher temperature than alcohol hence the mixture can be separated by distillation.

Chromatography is a method of separation that is dependent on how quickly a the components of a  mixture move through a stationary phase.

Acetone has a lower boiling point than water hence it collected first and cooled before water.

Clearly, substance A must be a solid since it is filtered out after adding water. Substance B must be a water soluble substance which can be recovered from water by evaporation to dryness. Hence substance A is rice, and substance B is sugar.

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Calcium ion created by the calcium atom losing two electrons has 18 electrons.

A neutral calcium atom has 20 electrons. When it loses two electrons, it becomes a calcium ion with a +2 charge. Since electrons have a negative charge, a calcium ion with a +2 charge will have 2 fewer electrons than a neutral calcium atom.

The calcium ion is a positively charged ion that has lost two electrons from the neutral calcium atom. It has a 2+ charge and is represented as Ca2+. The electronic configuration of the calcium ion is 1s² 2s² 2p⁶ 3s² 3p⁶, which means it has a total of 18 electrons. Thus, a calcium ion with a +2 charge will have 18 electrons.

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The thermochemical equation for the reaction between graphite (C) and oxygen (O₂) to form CO₂ with the evolution of 394 kJ of heat is given below:

C (s) + O₂ (g) ---> CO₂ (g)   ΔH = - 394 kJ

Thermochemical equations are equations that show the reactants and products of a reaction as well as the heat changes that occur in the reaction.

The heat changes that occur in a reaction are the heat that is evolved or absorbed when reactants form products.

Reactions in which heat is given off are known as exothermic reactions whereas reactions in which heat is absorbed are endothermic reactions.

The heat change that occurs in a given reaction is written as ΔH. Exothermic reactions have negative ΔH values whereas endothermic reactions have positive ΔH values.

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Answer:

In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed. It represents a reaction of a metal and a diatomic gas chlorine.

The statement "Placing electrons in an antibonding orbital reduces the bond order" is true about antibonding molecular orbitals. Option B is correct.

Antibonding molecular orbitals result from the destructive interference of two atomic orbitals that are out of phase with each other, meaning that their wave functions cancel each other out. This results in a higher energy antibonding orbital that has a node (a region of zero probability) between the two atoms.

When electrons occupy an antibonding orbital, their wave functions reinforce the destructive interference and weaken the bond between the atoms. This reduces the bond order, which is defined as half the difference between the number of bonding electrons and the number of antibonding electrons in a molecule.

Therefore, placing electrons in an antibonding orbital reduces the bond order. The other statements given in the options are not true or not directly related to the nature of antibonding orbitals.

Hence, B. placing electrons in an antibonding orbital reduces the bond order is the correct option.

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--The given question is incorrect, the correct question is

"Which statement is true about antibonding molecular orbitals? A) antibonding orbitals form by subtracting (canceling) one another where they overlap. B) placing electrons in an antibonding orbital reduces the bond order. C) it requires less energy to remove an electron from an antibonding orbital compared with removing an electron from the atomic orbital from which the anitbonding orbital forms. D) all of these are true. E) only a and b are true."--

Electrolyte and water balance is facilitated through adequate intake of Sodium, Chloride, Potassium nutrients.

Option B is correct.

Sodium, calcium, potassium, chloride, phosphate, and magnesium are electrolytes. You get them from the food sources you eat and the liquids you drink. It is possible for your body's electrolytes levels to become either too low or too high. This can happen when how much water in your body changes.

When dissolved in water, substances known as electrolytes naturally possess either a positive or negative electrical charge. They help your body control chemical reactions and keep the fluids inside and outside your cells in balance.

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This titration involves adding 50.00 ml of 0.125 M HBr (strong acid) to 0.200 M NaOH. (strong base). The Correct option is A

When the amount of acid added equals the amount of base added, the equivalence point is reached. According to the reaction's stoichiometry, this happens when 31.25 ml of NaOH have been added.

We use the fact that HBr is a strong acid, which implies that it totally dissociates in water to create H+ ions and Br- ions, to determine the pH at different volumes of NaOH supplied. Only the HBr is present at 0.00 ml of NaOH applied, hence the pH may be determined using the initial concentration of H+. We must use the amount of HBr that hasn't been completely neutralised after 10.0 ml of NaOH have been introduced in order to determine the concentration of H+ ions.

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Answer:

A

Explanation:

During the reaction, bacteria cause the nitrogen in NO3- to undergo reduction, and as a result, the oxidation number of oxygen will decrease.

In the given reaction, bacteria play a role in the reduction of nitrogen in the nitrate ion (NO3-). Reduction involves the gain of electrons, and in this case, the bacteria facilitate the transfer of electrons to the nitrogen atom in NO3-. As a result, the oxidation state of nitrogen decreases.

NO3- can be represented as [N(+5)O3(-2)]. In this compound, the oxidation state of nitrogen is +5, while the oxidation state of oxygen is -2.

During the reaction, the bacteria facilitate the transfer of electrons to nitrogen, causing it to undergo reduction. This results in a decrease in the oxidation number of nitrogen.

Since the oxidation state of oxygen is linked to the oxidation state of nitrogen in NO3-, when nitrogen is reduced, the oxidation state of oxygen will also change.

The reduction of nitrogen causes the oxygen atoms in the nitrate ion to have a lower oxidation number compared to their initial state.

Therefore, the oxidation number of oxygen decreases as a result of the reaction facilitated by the bacteria.

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The temperature of the gas is 423.58K.

According to the Ideal Gas equation, which compares the ratio of a mole of gas's volume and pressure to that of the gas's thermodynamic temperature and gas constant. The equation is exact for an ideal gas and approximates real gases at low pressures. The Ideal gas law is the equation of the state of a hypothetical ideal gas.

PV = nRT

where P is the ideal gas's pressure.

The ideal gas's volume is denoted by V.

The ideal gas amount expressed in moles is known as n.

The fundamental gas constant is R.

The temperature is T.

Given, P =2200 pa, V= 3.2\(m^{3}\), n= 2 mole, R= 8.31 \(Jmol^{-1}.k^{-1}\).

\(= > PV = nRT\)

=> 2200×3.2 = 2×(8.31)×T

=>\(\frac{2200*3.2}{2*8.31} = T\)

=> T = 423.58K.

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A star evolves off the main sequence when helium is exhausted in the stellar core.Our solar system’s gas giant planets (and those of other solar systems) did not become stars because they are not massive enough to generate the high temperatures and pressures necessary to start hydrogen fusion in the core.

Stars evolve off the main sequence when the nuclear fusion in their cores is no longer capable of supplying sufficient energy to maintain the gravitational energy, causing it to contract and the outer layers to expand and cool. When hydrogen runs out in the core of a star, the core shrinks and heats up and the outer layers expand, resulting in a red giant. However, when helium is consumed in the core, the core collapses and heats up, causing the outer envelope to get expelled, and the core evolves into a white dwarf.

A gas giant planet's temperature and pressure aren't high enough to generate fusion. They aren't dense enough to generate the heat required for nuclear fusion. Therefore, gas giant planets do not generate their own light and heat in the same way as stars. They can emit more energy than they obtain from the sun if they have a significant atmosphere. The planets in the solar system, such as Jupiter and Saturn, are examples of gas giants.

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Answer:

Explanation:

1 standard deviation range will look like: [average - SD, average + SD]

Here the miximum value will be: average - SD = 2.6 - 0.80 = 1.80 ml

and the maximum value will be: average + SD = 2.6 + 0.80 = 3.40ml

Answer:

3.01x10^23 C-12 atoms

Explanation:

C-12 has a molar mass of 12 grams/mole.  6 grams would therefore be (6grams/(12 grams/mole) = 0.5 moles.

One mole = 6.02x10^23 atoms

0.5 moles would mean 3.01x10^23 C-12 atoms

I don't know how to interpret the answer options.  What does "01 Ă— 1023" mean?  I see "3. 01 Ă— 1023 " which has some distant match to "3.01x10^23," but it is hard to judge.  Use the "^" sign to indicate a power, such as 10^23

11.0166 kJ of heat is required to melt 33.0 gg of ice. The amount of energy needed to melt 1 g of ice at 0 °C is 334 J, often known as the latent heat of melting. The latent heat of fusion is the energy that is released when the liquid water subsequently freezes.

The enthalpy change for melting ice is called the entlaphy of fusion. Its value is 6.02 kj/mol. This means for every mole of ice we melt we must apply 6.02 kj of heat. We can calculate the heat needed with the following equation:

q = n×ΔH

where: q = heat, n = moles, ΔH = enthalpy

In this problem we would like to calculate the heat needed to melt 33 grams of ice at 0 °C. This problem can be broken into two steps:

1. Calculate moles of water

2. multiply by the enthalpy of fusion

Step 1: Calculating moles of water

33 g×(1mol/18.02g) = 1.83 mols

Step 2: Multiply by enthalpy of fusion

q = n×ΔH = 1.83×6.02 = 11.0166 kJ

We get 11.0166 kJ heat

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Fertilizers supplement the soil with macronutrients needed in large amounts: nitrogen, phosphorous and potassium. ... Inorganic fertilizer, also referred to as synthetic fertilizer, is manufactured artificially and contains minerals or synthetic chemicals. so no

Explanation:

Answer:

0.68 mol/L

Explanation:

M=m/l

m is moles and l is liters

Since they gave us the values in the correct units, all we have to do it plug it in

M=0.34 mol/0.5 liters

M=0.68

Answer:

D. The energy level of the electron.

Explanation:

There are four quantum numbers which are used to describe the movement and paths or positon of each electron within an atom. Quantum numbers can be used to determine the electronic configuration of atoms and the most likely location of the atom's electrons. Quantum numbers are also used in determining other characteristics of atoms, such as ionization energy and the atomic radius.

The four quantum numbers are namely, principal, azimuthal, magnetic and spin quantum numbers.

Principal quantum numbers are denoted by the symbol ‘n’. They describe the principal electron shell or energy level the atom.The value of the principal quantum number are positive integer values that is equal to or greater than one. The value n = 1 represents the innermost electron shell of an atom, which corresponds to the lowest energy state of an electron. The larger the values of 'n' the greater the energy level and the farther the electron is from the nucleus.

sodium and chlorine Because Sodium and chlorine make Salt which are ionic compound.

Understanding the relationship between reactants and products in a reaction is crucial for understanding chemistry. That is what stoichiometry is.

It is a quantitative relationship between the mass (and thus the number of moles) of different products and reactants in a chemical reaction.

Chemical reactions must be balanced, or in other words, the products and reactants must both contain the same number of different atoms.

A chemical reaction cannot yield any knowledge about the relationship between its products and reactants if it is not balanced. In order to balance a chemical reaction, you should do so initially.

By placing coefficients in front of the reactants and products, we may balance processes. The stoichiometric coefficients are these values.

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Answer:

How can the equivalence point in a titration be detected by using a pH meter? The equivalence point is detected by noting a sharp change in the titration graph. Why is it important to choose an indicator that has an end point that closely matches the equivalence point during a titration?

Explanation: