calculate molarity if 25.0 mL of 1.75M HCl diluted to 65.0 mL 

Answer:

23 atoms for the first question

Explanation:

The total change in internal energy for the process is 70 J.

The change in internal energy (ΔE) of a system can be calculated using the first law of thermodynamics, which states that the change in internal energy of a system (ΔE) is equal to the heat added to a system (q) minus work done by the system (w):

ΔE = q - w

In this case, the system undergoes two steps:

Step 1: q = 72 J, w = -35 J (work is done on the system)

ΔE₁ = q - w = 72 J - (-35 J) = 107 J

Step 2: q = 35 J, w = 72 J (work is done by the system)

ΔE₂ = q - w = 35 J - 72 J = -37 J

The overall change in internal energy (ΔE) for the process is the sum of the changes in internal energy for each step:

ΔE = ΔE₁ + ΔE₂ = 107 J + (-37 J) = 70 J

Therefore, the overall change in internal energy for the process is 70 J.

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Among the following compounds, a strong electrolyte is NaF. It gives its constituent ions Na+ and F- when dissolved in water.

Electrolytes are molten or liquid substances containing ions which are free to move within the solution. There are two types of electrolytes namely strong electrolytes and weak electrolytes.

Strong electrolytes are those which are able to completely dissociates into its ions and thus conduct current. Weak electrolytes are weakly ionize or do not dissociates into its ions completely.

NaOH, KOH, NaCl , NaF etc are strong electrolytes. Whereas acetic acid, HF, water etc. are weak electrolytes. Strong ionic compounds are strong electrolytes too. Hence, NaF is the correct option.

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Answer:The green elements on the table you are referring to are called Noble gases or Inert gases.

Explanation:

The green elements on the table you are referring to are called Noble gases or Inert gases. They each have two electrons in their outer shell, which gives them a full and stable electron configuration.

The mass of 1.28 mol of water is 23.04 grams to three significant figures.

Molar mass is the mass of one mole of a substance, which is expressed in units of grams per mole (g/mol). The molar mass of a compound is the sum of the atomic masses of all the atoms in the compound.

The molar mass of water (H2O) is approximately 18.015 g/mol.

To find the mass of 1.28 mol of water, we can use the following calculation:

mass = number of moles × molar mass

mass = 1.28 mol × 18.015 g/mol

mass = 23.04 g

Therefore, the mass of 1.28 mol of water is 23.04 grams to three significant figures.

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On Earth he weighs 720 newtons. 36N is the weight. Therefore, the correct option is option D among all the given options.

The gravitational force of attraction exerted on an item by the presence of a huge second object, including the Earth or Moon. Weight is a result of the fundamental law of gravitation: whatever two things have the same weight.

They attract each other using a force that really is directly related to the sum of their masses as well as inversely related to the square of something like the distance separating them due to their masses.

F = mass ×4/9g

  = 720 ×4/9

  =36N

Therefore, the correct option is option D.

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The initiation of a tsunami by a stick-slip subduction zone is similar to the motion experienced by reverse  fault.

A reversal fault experiences similar motion as a stick-slip subduction zone when it starts a tsunami. The majority of tsunamis are created by subduction zones, which result in earthquakes when two tectonic plates collide beneath the ocean and encourage the movement of overlapping water.

The energy that builds up as a result of the friction between the plates increases to the point where it may be extrapolated to the limit between the two plates. When a reverse failure occurs in this process, the movement experienced by a reverse failure is analogous to the start of a tsunami through a stick-slip subduction zone.

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The statement that correctly describes the quantum number n is, "an electron with n = 2 is at a higher energy level than any other energy levels.

Generally, the set of numbers that is used to locate the position and energy of the electron in an atom are known as quantum numbers. Basically, there are four types of quantum numbers, which are named as, principal, azimuthal, magnetic and spin quantum numbers.

In any atom, there are a total of four quantum numbers: the principal quantum number (n), the orbital angular momentum quantum number (l), the magnetic quantum number (ml), and the electron spin quantum number (ms) which generally describes the characteristic properties of an atom.

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The mode is the value that appears most frequently in the data set. In this case, the value of 5 appears most frequently, occurring 4 times. Therefore, the mode of the number of boxes of graduated cylinders that were ordered for each lab of a college science department is 5.

The mode is a statistical measure that represents the value that appears most frequently in a data set. It is a useful measure of central tendency, especially when dealing with nominal or categorical data. The mode can be easily found by identifying the value with the highest frequency in the data set. In some cases, a data set may have multiple modes if there are two or more values with the same highest frequency.

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Chlorine atoms have 7 electrons in the outermost shell. As a result, one would expect chlorine to form ions with a charge of -1.

What is charge of an element?

Due to their equal amounts of protons and electrons, elements typically have no charge. Some atoms can, however, create ions by receiving or losing electrons to acquire a net positive or negative charge. Based on the periodic table group, you may calculate what this charge will be.

Compared to sodium, chlorine attracts electrons more strongly (shown by the thicker arrow). Chlorine is a negative ion with a charge of 1, making it such because it has 1 more electron than protons. Atoms acquire or lose electrons during the formation of ions until their outer energy level is reached.

Therefore, Chlorine has a charge of -1.

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Permanganate ion that should be added is 0.08 moles. Based on calculation, 0.08 moles of MnO4- ions can oxidize all the iron ions in the flask.

Given:

Therefore:

[tex]\begin{array}{ll}\sf n~MnO_4^- &\sf = \dfrac{coef. ~MnO_4^-}{coef. ~Fe^{2+}}\times n~Fe^{2+}~in\\\\&\sf =\dfrac{1}{5}\times 0.4\\\\&\sf = 0.04~moles.\end{array}[/tex]

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The oxidation state of an ion is the same as the number of electrons accepted or given away by the atom (option C).

Oxidation state is the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.

Oxidation state is also referred to as oxidation number, and it is the state of an atom having a particular oxidation number.

Examples of oxidation number are as follows:

Therefore, option C is synonymous to the oxidation state of an ion.

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The empirical formula of any ionic compound can be determined by balancing the charges on the ions to form a neutral compound.

Here are four binary ionic compounds that could be formed from the given ions:

These are just a few examples of binary ionic compounds that could be formed from the given ions.

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The reactant in a chemical process that releases less energy than the result does the following. Heat absorption will help the reaction move forward.

Heat absorption refers to the process by which a material or object takes in and retains thermal energy from its surroundings. This can occur through several mechanisms, including conduction, convection, and radiation.

The ability of a material to absorb heat is determined by its specific heat capacity, which is a measure of how much energy is required to raise the temperature of the material by a given amount. Materials with a high specific heat capacity can absorb more heat without experiencing a significant increase in temperature.

Heat absorption has important implications in many areas of science and engineering, including thermodynamics, materials science, and climate science. It is also relevant to everyday life, as it affects the performance of various devices and systems, such as air conditioning units, solar panels, and cooking appliances.

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The complete question is:

Which of the following is true about a chemical reaction in which the reactant stores less energy than the product?

Rank of the given compounds in order of lowest to highest enthalpy of vaporization as follows CH₃NH₂ < CH₃SH < CH₃CH₃.

The enthalpy of vaporization of a substance is related to the strength of its intermolecular forces. Substances with weaker intermolecular forces tend to have lower enthalpies of vaporization, as they require less energy to overcome those forces and vaporize.

In this order, the compounds have increasing strength of intermolecular forces. Methanethiol (CH₃SH) has stronger intermolecular forces than methylamine (CH₃NH₂), and both of these have stronger intermolecular forces than propane (CH₃CH₃).

This is because CH₃NH₂ and CH₃SH can form hydrogen bonds between molecules, while CH₃CH₃ can only experience weaker London dispersion forces.

Hence, the correct option is A.

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The curved arrow representation for the provided resonance structure is attached.

The negative charge (lone pair) is moved towards the hybridized carbon and the pi electrons also move towards another carbon, so the delocalization takes place and forms new C=O, C=C bond, and then oxygen atom gets the negative charge.

The lone pairs on nitrogen atom moved to the hybridized carbon and another pi bond moves towards the oxygen atom. This is shown with the curved arrows.

Note that necessary diagrams are attached.

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The mass of lead based on data is 97.65 grams. The mean atomic mass of lead can be founded in periodic table of elements.

Given:

Therefore:

First, calculate the moles of lead.

[tex]\begin{array}{ll}\sf n &\sf = \dfrac{N}{L}\\\\&\sf = \dfrac{2.84\times 10^{23}}{6.02 \times 10^{23}} \\\\&\sf = 0.471~moles.\end{array}[/tex]

Second, calculate the mass of lead.

[tex]\begin{array}{ll}\sf g&\sf = n \times Ar\\\\&\sf = 0.471 \times 207\\\\&\sf = 97.65~grams.\end{array}[/tex]

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Polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

Polarity is indeed a division of electric charge in chemistry that results in a molecule and its chemical groups possessing and electric dipole moment with a negative charges end as well as a positive charge end.

Atoms prefer to adopt the configuration of noble gases in order to achieve stability. As a result, we may deduce that chemical bonding was responsible for atom stability and the formation of molecules. Polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

Therefore,  polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

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3-methyl-2-Pentene is the correct answer. 3-methyl-2-pentene is an alkene with a molecular formula of C_5H_10. It is a colorless liquid with a pungent odor.

Alkenes are a class of organic compounds that contain a carbon-carbon double bond. They are unsaturated hydrocarbons, meaning that they have fewer hydrogen atoms than their corresponding saturated hydrocarbons.

The general formula for an alkene is Cn[tex]H_{2}[/tex]n, where "n" represents the number of carbon atoms in the molecule. The simplest alkene is ethene, which is also called ethylene and has the chemical formula [tex]C_{2} H_{4}[/tex]. Alkenes are important intermediates in many industrial processes and are used in the production of a variety of products including plastics, synthetic rubber, and solvents.

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The nucleophile in a Friedel-Crafts reaction is the alkyl or acyl group attached to the Lewis acid catalyst.

In a Friedel-Crafts reaction, a Lewis acid catalyst, such as aluminum chloride (AlCl3) or iron(III) chloride (FeCl3), is used to activate an alkyl or acyl halide to make it a better electrophile. The activated alkyl or acyl group then acts as the nucleophile, attacking the aromatic ring of the substrate to form a new carbon-carbon bond.

The overall reaction can be summarized as follows:
R-X + AlCl3 → R+ + AlCl4- (activation of the alkyl or acyl halide)
R+ + Ar-H → Ar-R + H+ (nucleophilic attack on the aromatic ring)

In this reaction, the nucleophile is the R group, which can be an alkyl or acyl group. The Lewis acid catalyst activates the alkyl or acyl halide, making it a better electrophile and allowing it to attack the aromatic ring.

The end result is the formation of a new carbon-carbon bond between the alkyl or acyl group and the aromatic ring.

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1.852 grams of H₂ are produced when 67.12 grams of HCl are reacted with copper.

A mole is a important unit of measurement. 1 mole =  6.023 × 10²³ particles.

The term mole is defined as the amount of matter containing 6.023 × 10²³ molecules.

For each two moles of HCl there is one mole of hydrogen.

So first convert the grams to moles.

Then find formula mass of HCl

The mass of hydrogen = 1.007 amu

mass of chlorine = 35.453 amu

Then 1.007 + 35.453 = 36.46 grams

Hence, one mole of HCl = 36.46 grams/mol

67.12g ÷ 36.46 = 1.84 moles

Therefore, 1.84 mols / 2

= 0.92 moles of hydrogen

Now to convert the moles into grams by multiply the number of moles of hydrogen by the atomic mass of hydrogen

= 0.92 mols × 2.014 g/mol

= 1.852 grams of hydrogen

We get 1.852 grams of hydrogen.

Thus, 1.852 grams of H₂ are formed.

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Based on this simulation, the following statements are true of strong acids:

- Strong acids have lower pH values than weak acids. This is because strong acids completely dissociate in water, releasing more H+ ions and lowering the pH of the solution.

- Strong acids completely dissociate into H₂O (hydronium) and A (conjugate base) leaving almost no strong acid in the solution. This is a key characteristic of strong acids, as they fully dissociate in water to form hydronium ions and the conjugate base.

- Strong acids dissociate to form more hydronium ions than a weak acid. Since strong acids fully dissociate in water, they release more H+ ions, which combine with water to form more hydronium ions.

The following statements are not true of strong acids:

- When strong acids dissociate, the concentration of the strong acid in the solution becomes negligible. While it is true that strong acids completely dissociate in water, the concentration of the strong acid does not become negligible. The concentration of the strong acid is simply equal to the concentration of the hydronium ions and the conjugate base.

- The products formed when a strong acid dissociates can carry out a reverse reaction to form the strong acid once more. This is not true of strong acids, as they fully dissociate in water and do not undergo a reverse reaction to form the strong acid again.

This is a characteristic of weak acids, which only partially dissociate in water and can undergo a reverse reaction to reform the weak acid.

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Answer: All visible light waves except red are absorbed by the ball. The wave transfers its energy to the material.

Explanation: The red is reflected back, which is how we see color. This is why most plants look green, they cannot absorb green light.

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The concentrations of the components will vary as explained below.

(a) If the temperature is increased, the equilibrium will shift in the endothermic direction to consume some of the added heat. This means that the concentration of SO2 and O2 will increase, while the concentration of SO3 will decrease.

(b) If the pressure is increased and the volume is decreased, the equilibrium will shift in the direction that produces fewer moles of gas to relieve the pressure. Since there are 3 moles of gas on the left side of the equation and 2 moles of gas on the right side, the equilibrium will shift to the left to produce more SO2 and O2 and less SO3.

(c) Adding a catalyst will increase the rate of the forward and reverse reactions equally, so the equilibrium concentrations of SO2, O2, and SO3 will remain the same, but they will be reached more quickly.

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The ranking from lowest boiling point to highest boiling point is (1) 0.10 m NaCl, (2) 0.10 m Al(NO3)3, (3) 0.30 m C12H22O11 (sucrose).

The boiling point of a solution is directly related to the solution's vapor pressure. This is due to the fact that, as the vapor pressure of the solution increases, the boiling point of the solution will also increase. The vapor pressure of a solution is a function of its concentration, so the higher the concentration of a solution, the higher its vapor pressure. Thus, the higher the concentration of a solution, the higher its boiling point.

Therefore, the correct order, from lowest to highest boiling point, is: (1) 0.10 m NaCl, (2) 0.10 m Al(NO3)3, (3) 0.30 m C12H22O11 (sucrose).

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The volume of the unit cell of element X is approximately 1.785 × 10⁸ picometers cubed (pm³).

In a body-centered cubic unit cell, there are atoms at each of the eight corners of the cube, and one atom in the center of the cube. Each atom at the corner is shared by eight unit cells, while the atom at the center is contained within a single unit cell.

The distance from one corner of the cube to the opposite corner is equal to four times the radius of the atom (i.e. 4 × 151 pm = 604 pm), which is known as the body diagonal of the cube.

Therefore, the length of one side of the cube is given by:

a = (4/√3) × r

= (4/√3) × 151 pm

≈ 554.6 pm

The volume of the unit cell is then given by:

V = a³

= (554.6 pm)³

≈ 1.785 × 10⁸ pm³

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Answer:

Explanation:

Synthesis

2H2 + O2 ---> 2 H2O

Decomposition

CaCO3----> CO2 + CaO

Single replacememt

Na + KCl---> KCl + Na

Double replacement

AgNO3 + NaCl --> AgCl + NaNO3

The statement that, the particles are so small compared with the distances between them that the volume of the individual particles can be assumed to be zero is true.

This statement is a reasonable approximation for the behavior of particles in a gas or a dilute solution, where the individual particles are separated by relatively large distances. In these cases, the particles are typically much smaller than the average distance between them, so their volume can be assumed to be negligible.

However, in condensed phases such as liquids and solids, the particles are much closer together, and their volumes cannot be ignored.

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The mass balance expression for the sodium is 45.36 mmol and arsenate is 49.98 mmol species in the final solution.

According to the following equation, sodium hydrogen arsenate ([tex]Na_{2} HAsO_{4}[/tex]) and sodium hydroxide ([tex]NaOH[/tex]) react to produce sodium arsenate ([tex]Na_{3} AsO_{4}[/tex]) and water ([tex]H_{2} O[/tex]) when combined:

[tex]Na_{2} HAsO_{4} + 2 NaOH[/tex] → [tex]Na_{3} AsO_{4} + 2 H_{2} O[/tex]

To determine the mass balance expressions for the sodium and arsenate species in the final solution, we need to consider the initial amounts of these species in each of the two solutions and the changes that occur upon mixing.

For the sodium ion ([tex]Na^{+}[/tex]), we have:

Initial amount

= (500.0 mL) x (0.04074 mol/L)

= 20.37 mmol

Amount added

= (500.0 mL) x (0.04997 mol/L)

= 24.99 mmol

Total amount

= 20.37 mmol + 24.99 mmol

= 45.36 mmol

The sodium ion participates in the reaction as a spectator but doesn't change chemically. As a result, the following is the mass balance statement for [tex]Na^{+}[/tex] in the final solution:

[[tex]Na^{+}[/tex]] = 45.36 mmol

For the arsenate ion ([tex]AsO_{4} ^{2-}[/tex]), we have:

Initial amount

= (500.0 mL) x (0.04074 mol/L)

= 20.37 mmol

Amount added

= (500.0 mL) x (0.04997 mol/L) x (2/1)

= 49.98 mmol

Total amount

= 20.37 mmol + 49.98 mmol

= 70.35 mmol

In the reaction, 1 mol of  [tex]Na_{2} HAsO_{4}[/tex]produces 1 mol of [tex]Na_{3} HAsO_{4}[/tex]. Therefore, the amount of [tex]AsO_{4} ^{2-}[/tex]produced is equal to the amount of  [tex]Na_{2} HAsO_{4}[/tex] that reacted. Since we started with 20.37 mmol of [tex]Na_{2} HAsO_{4}[/tex] and it reacts in a 1:1 ratio with [tex]NaOH[/tex], the amount of  [tex]Na_{2} HAsO_{4}[/tex] that reacted is equal to:

Amount of  [tex]Na_{2} HAsO_{4}[/tex] reacted

= (500.0 mL) x (0.04074 mol/L)

= 20.37 mmol

The remaining amount of [tex]AsO_{4} ^{2-}[/tex] in the final solution is therefore:

Amount of [tex]AsO_{4} ^{2-}[/tex] in the final solution

= 70.35 mmol - 20.37 mmol

= 49.98 mmol

The mass balance expression for [tex]AsO_{4} ^{2-}[/tex] in the final solution is:

[ [tex]AsO_{4} ^{2-}[/tex]] = 49.98 mmol

Therefore, the mass balance expressions for the sodium and arsenate species in the final solution are:

[[tex]Na^{+}[/tex]] = 45.36 mmol

[ [tex]AsO_{4} ^{2-}[/tex]] = 49.98 mmol

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