An acid is used to bring the pH of a solution from pH 9 to pH 6. How many times more acidic is the final solution than the initial solution? Select one: a. 100 b. 10 c. 3 d. 1000

There are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2. Details about formula units can be found below.

Formula unit refers to the empirical formula of an ionic compound for use in stoichiometric calculations.

According to this question, there are 111g of CaCl2. The formula units can be calculated by multiplying the number of moles by Avogadro's number.

no of moles in CaCl2 = 111g ÷ 111g/mol = 1mol

Formula units of CaCl2 = 1mol × 6.02 × 10²³ = 6.02 × 10²³ formula units.

Therefore, there are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2.

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The equilibrium concentration of ethyl acetate will be 5.39 M.

Initially, 8.59 M acetic acid react with 8.59 M ethanol.

acetic acid  +  ethanol  ===>  ethyl acetate  +  water

     (8.59)           (8.59)                      (0)

after some time, some change will happen.

acetic acid  +  ethanol  ===>  ethyl acetate  +  water

  (8.59-x)         (8.59-x)                   (x)

At equilibrium condition,

acetic acid  +  ethanol  ===>  ethyl acetate  +  water

     (3.20)           (3.20)                      (x)

At equilibrium, for acetic acid and ethanol to go from 8.59 to 3.20, the value of x must be 5.39.

Therefore, the equilibrium concentration of ethyl acetate will be 5.39 M.

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Considering the Boyle's law, the new volume becomes 1,148,344.444 mL or 1148.34 L.

Boyle's law relates pressure and volume, stating that the volume occupied by a given mass of gas at constant temperature is inversely proportional to pressure. This means that if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.

Boyle's law is expressed mathematically as:

P×V=k

Now it is possible to assume that you have a certain volume of gas V1 which is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and the following is true:

P1×V1=P2×V2

In this case, you know:

Replacing in the Boyle's law:

10335.1 atm ×250 mL= 2.25 atm×V2

Solving:

(10335.1 atm ×250 mL)÷ 2.25 atm= V2

1,148,344.444 mL= 1148.34 L=  V2

Finally, the new volume becomes 1,148,344.444 mL or 1148.34 L.

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C6FeN6⁻³ is the  correct chemical formula for hexacyanoferrate (III) ion.

This contains information about the proportion of atoms present inn a chemical compound.

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The salt produced by the neutralization of 2CsOH(aq) and H₂SO₄(aq) is Cesium Sulphate - Cs₂SO₄.

The given compounds are

2CsOH - a strong base and H₂SO₄ - a strong acid

When they react with one another, the neutralization takes place and forms a neutral compound Cs₂SO₄ called as a salt.

The reaction is as follows:

2CsOH(aq) + H₂SO₄ → Cs₂SO₄ + H₂O

Therefore, the salt produced will be Cs₂SO₄(Cesium sulphate).

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Explanation:

in this question, we're asked how to determine whether we have a metallic or nonmetallic substance.So what you want to do is one to remember that metals are malleable and Nonmetal are brittle. So if we were to hammer the metal, it would be very malleable, but the nonmetal would fall apart. And never we could just hammer the sample and see whether it was malleable. And therefore it would be a medal or a brittle and therefore being nonmetal. 

From the absorption spectra of a gas, we can see the  amount of thermal energy the gas contains (option D).

The absorption spectra shows us the energy that is taken in by a gas. We know that when a gas is heated, it absorbs energy which shows up in its absorption spectra.

Thus, from the absorption spectra of a gas, we can see the  amount of thermal energy the gas contains.

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The charge on calcium in CaO is 2.

A bond between two atoms is formed by two ways: by complete transfer of electrons or by sharing of electrons. The bond formed by transfer of electrons is called an ionic bond while the bond formed by electrons sharing is called the covalent bond. There is on clear positive or negative charge on atoms in a molecules in case of covalent bond.

It is given that an ionic bond is formed between calcium and oxygen. The oxygen has -2 charge. This means that oxygen atoms has accepted two electrons from calcium. When an atoms donate electrons it acquires positive charge.

Ca gives two electrons to oxygen atom. Hence, the charge on calcium is +2. The correct option is 2.

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The value of Ka of the weak acid is 4.47 x 10^-3.

The acids that do not dissociate completely in the aqueous solution and remains in equilibrium are called weak acids. The acid dissociation constant of the weak acid is represented as Ka.

Consider a weak acid HA. Its dissociation reaction will be:

      HA        ----->      H+         +          A-

I    0.072                    0                       0

C     -x                       +x                      +x

E  0.072-x                  x                        x

Calculations:

pH = -log[H+]

1.80 = -log[H+]

[H+] = 0.01585 M

Hence, x = 0.01585 M

The value of Ka is calculated as:

Ka = x^2/0.072-x

= (0.01585)^2/(0.072 - 0.01585)

= 4.47 x 10^-3

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The empirical formula of the compound is CHCl₃.

Given,

Mass of carbon = 5.03 g

Mass of hydrogen = 0.42 g

Mass of chlorine = 44.5 g

Molecular weight of carbon = 12 g

Molecular weight of hydrogen = 1 g

Molecular weight of chlorine = 35.4 g

First, calculate the moles of each element,

                      Moles = given mass/ molecular weight

Moles of carbon = 5.03/12 = 0.42

Moles of hydrogen = 0.42/1 = 0.42

Moles of chlorine = 44.5/ 35.4 = 1.26

Divide the moles of each element by the smallest number of moles,

0.42 mol of C/ 0.42 = 1 C

0.42 mol of H/ 0.42 = 1 H

1.26 mol of Cl/0.42 = 3 Cl

The ratio of elements is 1:1:3

Therefore the empirical formula of the compound will be CHCl₃.

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Answer:CHCl₃

Explanation:

The naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is known as D)ores.

Ore is natural rock or sediment that consists of one or more valuable minerals, commonly containing metals, that can be mined, handled, and offered at a profit. Ore is extracted from the earth thru mining and treated or subtle, often via smelting, to extract the precious metals or minerals.

Ore is a deposit in Earth's crust of one or greater valuable minerals. The maximum valuable ore deposits include metals crucial to industry and alternate, like copper, gold, and iron. Copper ore is mined for ramification of industrial uses.

Ores are minerals that have a high awareness of a sure detail, commonly metallic. Examples are cinnabar (HgS), an ore of mercury, sphalerite (ZnS), an ore of zinc, cassiterite (SnO2), and an ore of tin (Mineral).

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The empirical formula of compounds formed from the given ions are as follows:

The empirical formula of a compound is the simplest formula of the compound showing the simplest ratios in which elements in the compound combine.

The empirical formula of compounds formed from the given ions are as follows:

In conclusion, the empirical formula is the simplest formula of a compound.

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The new volume of the hydrogen gas at s.t.p., [tex]V_{2}[/tex] = 750 dm³

The molar volume of a gas at s.t.p. is 22.4 dm³.

The change in volume gases at different temperatures and pressures are given by the general gas equation given below:

[tex]V_{1}[/tex] = 600 dm³

[tex]P_{1}[/tex] = 950mmHg

[tex]T_{1}[/tex]= 273 K

The new volume of the hydrogen gas at s.t.p., [tex]V_{2}[/tex] is calculated thus:

[tex]V_{2}[/tex] = (950 x 600 x 273)/(760 x 273) = 750 dm³

In conclusion, the volume of a gas changes with temperature and pressure changes.

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The gauge pressure of the oxygen in the tank in atmospheres is 11.46 atm.

The gauge pressure is given as the pressure relative to the ambient atmospheric pressure. The gauge pressure can be calculated as:

Gauge pressure = System pressure - Atmospheric pressure

The system pressure of the 35-liter tank with 18.3 moles oxygen is given as:

Pressure = moles * Rydberg constant * Temperature / Volume

Pressure = 18.3 moles * 0.08 L.atm.mol⁻¹.K⁻¹ * 298 K / 35 L

Pressure = 12.46 atm

The standard pressure is given as 1 atm.

Thus, the gauge pressure of the oxygen in the tank can be:

Gauge pressure = System pressure - Atmospheric pressure

Gauge pressure = 12.46 atm - 1 atm

Gauge pressure = 11.46 atm

The gauge pressure of the oxygen in the tank in atmospheres is 11.46 atm.

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Answer:

The answer is 8.31 atm.

Explanation:

Ideal Gas Law = PV = nRT
(where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.)

First, convert the temperature from Celsius to Kelvin:

25°C + 273.15 = 298.15 K

Next, plug in the known values into the Ideal Gas Law equation:

P * 35.0 L = 18.3 moles * 8.31 J/mol*K * 298.15 K

Finally, solve for P:

P = (18.3 moles * 8.31 J/mol*K * 298.15 K) / 35.0 L

The pressure is in units of joules per liter. To convert it to atmospheres, divide by the atmospheric pressure in joules per liter:

1 atm = 101,325 Pa = 101,325 J/m^3 = 101.325 kPa

P (in atm) = (18.3 moles * 8.31 J/mol*K * 298.15 K) / (35.0 L * 101.325 kPa)

= 8.31 atm

In coordination chemistry,

A coordinate covalent bond also known as a dative bond, dipolar bond, or coordinate bond is a kind of two-center, two-electron covalent bond in which the two electrons derive from the same atom. The bonding of metal ions to ligands involves this kind of interaction.

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Elements 3 to 10 (Li to Ne) show a more or less steady increase in ionization energy.

The amount of energy required to remove an electron from an isolated atom or molecule.

The major difference is the increasing number of protons in the nucleus as you go from lithium to neon. That causes greater attraction between the nucleus and the electrons and so increases the ionization energies. In fact the increasing nuclear charge also drags the outer electrons in closer to the nucleus.

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Answer: B

Explanation:

There is an atom of one type of element and then two atoms of another type of element.

A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.

Density is an intrinsic property of matter, equal to the quotient between the mass and the volume.

A student has a block with a volume (V) of 150 cm³ and a density (ρ) of 30 g/cm³. We can calculate its mass (m) using the definition of density.

ρ = m/V

m = ρ × V = 30 g/cm³ × 150 cm³ = 4,500 g

A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.

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The atomic numbers of elements with a filled outermost shell are 2, 10, 18, etc.

What are noble gases?

Noble gases are elements on the periodic table with filled outermost shells.

With filled outermost shells, these elements are not able to react in chemical reactions ordinarily.

These elements include Helium (2), Neon (10), Argon (18), etc.

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The partial pressure of oxygen in the alveoli is about 104 mm Hg, while the partial pressure of carbon dioxide in the alveoli is 40 mm Hg.

The alveoli are tiny air sacs where gaseous exchange takes place between the lung and the bloodstream.

Because oxygen needs to diffuse into the bloodstream while carbon dioxide needs to diffuse out, the partial pressure of oxygen in the alveoli is around 104 mmHg while that of carbon dioxide is 40 mmHg.

With higher partial pressure than in the blood, oxygen from the alveoli will be able to diffuse into the blood. With lower partial pressure than in the blood, carbon dioxide will be able to diffuse from the blood into the alveoli.

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The most momentum is D. A 65 kg person with a velocity of 2.5 m/s north.

Momentum can be defined as "mass in motion." All items have mass; so if an object is moving, then it has momentum - it has its mass in movement. The amount of momentum that an item has depends upon two variables: how a lot of stuff is moving and how fast the stuff is moving.

Momentum is the force that exists in a shifting object. The momentum pressure of a moving item is calculated by way of multiplying its mass (weight) via its velocity (pace). Surely put, a 20-lb. rock going at 10 mph has lots more momentum force than a 3-lb. Ball going at the same speed.

Momentum is the pressure that exists in a transferring item. The momentum pressure of a shifting object is calculated with the aid of multiplying its mass (weight) by way of its velocity (velocity). Simply put, a 20-lb. Rock going at 10 mph has lots more momentum pressure than a three-lb. Ball going at equal speed. They're each associated with an item's pace (or speed) and mass, but momentum is a vector quantity that describes the amount of mass in motion. Kinetic power is a measure of an item's energy from movement and is a scalar.

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The specific gravity of urine:

The specific gravity of 10ml of urine should be greater than the specific gravity of 10ml of distilled water.

What is specific gravity?

The comparison of the densities of solutes and water is done using specific gravity. Therefore, the following equation, where "D" stands for "density," can be used to represent particular gravity:

USG = [tex]\frac{D solutes}{Dwater}[/tex]

There are no units listed for specific gravity. A typical specific gravity value should range from 1.005 to 1.030. Accordingly, urine ought to be only a little bit denser than water. Low specific gravity is one with a value below 1.005, whereas a high specific gravity is one with a value above 1.030.

The density of the sample is increased by the presence of dissolved solutes in urine that are absent from distilled water.

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Answer:

an acid +metal =salt +hydrogen

Explanation:

HCL+Mg =Mgcl2+H2

(because Mg has an ion with a +2 charge ,it attracts Cl with a -2 charge )

therefore the correct answer is D for the above reasons

Answer:

When magnesium reacts with hydrochloric acid (HCl), a single-replacement reaction occurs. These reactions involve the substitution of one element in a compound with another. In this case, the hydrogen in HCl will be swapped with the magnesium metal because both of these elements make cations (positively-charged ions) when they participate in ionic bonding.

So why does the chorine have a subscript of 2 when it bonds with magnesium? This occurs in order to balance the ionic charges and make the overall compound neutral.

Magnesium wants to give away 2 electrons when it ionizes, forming the cation Mg²⁺. However, chlorine only wants to gain 1 electron to fill its valence shell, making it form the anion, Cl⁻. As you can see, if just one of each ion were to bond, the compound would have an overall charge of +1 because (+2 - 1 = +1). Therefore, the compound can be made neutral if two chlorine ions bond with just 1 magnesium ion (+2 - 1 - 1 = 0).

The hydrogen ion from HCl becomes H₂ after the reaction occurs. This occurs because hydrogen generally exists as a diatomic compound in nature (diatomic = exists as 2 atoms).

The complete balanced equation for the reaction is:

Mg + 2 HCl  ------> MgCl₂ + H₂

The chemical equation for photosynthesis is 6CO2+6H2O→C6H12O6+6O2. 6CO2+6H2O→C6H12O6+6O2.

In plants, the process of photosynthesis takes place in the mesophyll of the leaves, inside the chloroplasts.

Photosynthesis is the technique with the aid of which inexperienced plant life and positive other organisms remodel light electricity into chemical strength.

During photosynthesis in green flowers, mild strength is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-wealthy organic compounds.

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Answer:

The answer is actually:

D

Explanation:

The ways to identify the components necessary for a combustion reaction include:

This is referred to as burning and involves high-temperature exothermic redox chemical reaction.

This type of reaction involves the use of a gas such as oxygen which supports it and other flammable substances.

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Hydrometallurgy uses electrical processes.

Hydrometallurgy can be defined as a steel healing method used to gain metals from ores and waste materials with the usage of aqueous media via combining water, oxygen, and other chemical reagents without or with the use of pressurized surroundings.

That is a method of metal or steel compound extraction from ore via pre-remedies that contain the use of a bleaching agent, separation of impurities, and precipitation. It's far used in the extraction of uranium, gold, zinc, silver, and copper from low-grade ores.

In hydrometallurgy, zinc and iron can be used to displace copper from their answer. But to displace zinc, extra reactive metals i.e., metals having decreased reduction potentials than zinc along with Mg, Ca, ok, etc. are required. ... for this reason, copper may be extracted by means of hydrometallurgy but no longer zinc.

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