A sample of field moist soil weighs 769 g. The total volume of the sample is 500 cubic centimeters. When oven-dry, the sample weighs 625 g.​

The pH of the TRIS acid is  \(8.1 + log [\frac{A-}{0.1} ]\).

The pH of the TRIS base is  \(8.1 + log [\frac{B}{0.1} ]\).

pH of the TRIS acid

The pH of the TRIS acid is determined by applying Henderson - Hasselbalch equation as follows;

\(pH=pK_a + log \ [\frac{A^-}{HA} ]\)

where;

pKa of TRIS acid = 8.1

\(pH = 8.1 + log [\frac{A-}{0.1} ]\)

The pH of the TRIS base is determined by applying Henderson - Hasselbalch equation as follows;

\(pH=pK_a + log \ [\frac{B}{BH^+} ]\)

where;

\(pH = 8.1 + log [\frac{B}{0.1} ]\)

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From the given data, the name of the hydrated salt would be  \(CoCl_2.83H_2O\).

The formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.

First, we need to determine the mass of the anhydrous salt and the water of hydration.

Mass of crucible (x) = 12.090 g

Mass of hydrated salt + crucible (y) = 16.250 g

Thus, the mass of the hydrated salt can be determined by subtracting x from y.

Mass of hydrated salt = 16.250 - 12.090 = 4.16 g

Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g

Mass of anhydrous salt = z - x

                                      = 12.424 - 12.090

                                      = 0.334 g

Mass of water = 4.16 - 0.334

                        = 3.826 g

Now, let's find the moles:

Molar mass of \(CoCl_2\) = 129.839 g/mol

Molar mass of water = 18.01 g/mol

Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol

Mole of water = 3.826/18.01 = 0.2124 mol

Dividing through by the smallest mole

\(CoCl_2\) =  0.00257 / 0.00257  = 1

water = 0.2124/ 0.00257 = 83

Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)

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Answer:

it is b

Explanation:

i just took test b

Answer:

C  maneeeee

:)

Explanation:

Some key characteristics of nanoparticles are:

Size-dependent properties

Quantum effects

Increased surface reactivity

Agglomeration and stability

Optically active

When compared to bulk materials, nanoparticles, or particles with a size range of 1-100 nanometers, exhibit special characteristics and behaviours. Nanoparticles have a number of important properties.

Properties that depend on size: Due to their large surface area to volume ratio, nanoparticles have properties that depend on their size. As a result, these materials may exhibit improved catalytic, optical, magnetic, and reactivity properties when compared to their bulk counterparts.

Quantum effects: At the nanoscale, quantum effects become prominent, leading to changes in the electronic and optical properties of nanoparticles. This can include quantum confinement, where the energy levels of electrons are restricted due to the small size, leading to altered behavior.

Increased surface reactivity: More interaction sites are possible because to the increased surface area of nanoparticles, which increases their reactivity. This characteristic is used in many different applications, such as catalysis, where nanoparticles' greater surface area makes them effective catalysts.

Nanoparticle agglomeration and stability: Attractive forces between nanoparticles cause them to group together or form clusters. To prevent aggregation and preserve their stability, appropriate surface modification and stabilisation approaches are required

Optically active: Nanoparticles have the capacity to display distinct optical characteristics, such as plasmon resonance, which is characterised by enhanced light absorption and scattering due to collective oscillations of electrons. Applications for this feature can be found in the disciplines of sensing, imaging, and photovoltaics.

Overall, the characteristics of nanoparticles make them highly valuable in a wide range of fields, including electronics, medicine, energy, and materials science.

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Answer:

Explanation:

The balanced chemical equation for the reaction between NaOH and HCl is:

NaOH + HCl → NaCl + H2O

According to the balanced equation, one mole of NaOH reacts with one mole of HCl to produce one mole of NaCl and one mole of H2O. Therefore, the number of moles of NaOH used to titrate the HCl solution is equal to the number of moles of HCl in the solution.

First, we need to calculate the number of moles of NaOH used in the titration:

moles of NaOH = concentration of NaOH × volume of NaOH used

Substituting the values, we get:

moles of NaOH = 0.800 M × 0.01500 L = 0.0120 moles

Since NaOH and HCl react in a 1:1 molar ratio, the number of moles of HCl in the solution is also 0.0120 moles.

Now, we can calculate the initial concentration of the HCl solution using the following formula:

initial concentration of HCl = moles of HCl / volume of HCl used

The volume of HCl used is 50.00 mL, which is equal to 0.05000 L. Therefore, we get:

initial concentration of HCl = 0.0120 moles / 0.05000 L = 0.240 M

Therefore, the initial concentration of the HCl solution is 0.240 M.

Answer: The freezing point of a solution is the temperature at which the solution becomes a solid. The freezing point of a solution is lower than the freezing point of the pure solvent because the solute particles interfere with the movement of the solvent molecules, which slows down the freezing process.

To determine the freezing point of a solution, we can use the freezing point depression equation:

ΔTf = Kf x molality

where ΔTf is the change in freezing point, Kf is the freezing point depression constant for the solvent, and molality is the concentration of the solute in the solution expressed in moles of solute per kilogram of solvent.

To find the freezing point of a 0.520 m aqueous solution of NaCl (sodium chloride), we need to know the freezing point depression constant for water, which is 1.86 °C/m. We can then use the equation above to calculate the change in freezing point:

ΔTf = 1.86 °C/m x 0.520 m = 0.97 °C

To find the freezing point of the solution, we need to subtract the change in freezing point from the freezing point of the pure solvent. The freezing point of pure water is 0 °C, so the freezing point of the 0.520 m aqueous solution of NaCl is:

0 °C - 0.97 °C = -0.97 °C

Answer:

-1.934

Explanation:

0 - {(0.520) x (1.86) x (2)}

For the principal quantum number n = 5, the values of l that are possible are;  0, 1, 2, 3, 4

The position of the electron in an atom are shown by the quantum numbers. The quantum numbers give the description that matches the possible place that the electron could be found in a given atom. The set of quantum numbers are;

1) Principal quantum number

2) Magnetic quantum number

3) Spin quantum number

4) Orbital quantum number.

We know that the values of the principal quantum number would vary with the values of the orbital quantum number thus we have that the values of the orbital quantum numbers must be in the range of 0 to n - 1

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Conversion factor used to convert volume is 1L = 1000 mL.

15.43L = 15430mL

The same attribute is expressed using a unit conversion but in a different unit of measurement. For instance, time can be expressed in minutes rather than hours, and distance can be expressed in kilometers, feet, or any other measurement unit instead of miles. Measurements are frequently offered in one set of units, like feet, but are required in another set, like chains. A conversion factor is a mathematical equation that facilitates an equal exchange of feet for chains.

A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value.

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Answer:

6.2moles of Gold

Explanation:

To solve this problem, we are going to use the mole concept approach.

 Given that;

  Number of atoms of gold is 3.73 x 10²⁴ atoms

Now;

  In 1 mole of any substance, we have 6.02 x 10²³ atoms;

   So;

  If there  6.02 x 10²³ atoms in  1 mole of any substance;

                 3.73 x 10²⁴ atoms will contain  \(\frac{3.73 x 10^{24} }{6.02 x 10^{23} }\)    = 6.2moles of Gold

According to the concept of redox reactions, the answer to this question is option C.

When the cell potential is positive. A redox reaction is spontaneous when the cell potential is positive.The cell potential is the measure of the driving force of the chemical reaction occurring in the electrochemical cell. In an electrochemical cell, a redox reaction occurs, which leads to the production of an electric potential.

If this potential is positive, then the redox reaction is considered spontaneous. However, if the potential is negative, then the reaction is non-spontaneous.In general, a redox reaction is spontaneous if the potential difference between the two electrodes of the cell is positive. This means that the reaction will occur spontaneously without any external energy input.

Thus, the correct option is C.

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Answer:

Solid have the lowest entropy

The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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The volume of an object that floats on the water can be found by making it sink forcefully. For this the object is tied to another object that can easily sink. The floating object will sink in the water and its volume can be determined.

Volume is a measure of three-dimensional space. It is often quantified numerically using SI derived units or by various imperial or US customary units . The definition of length (cubed) is interrelated with volume. The volume of a container is generally understood to be the capacity of the container; i.e., the amount of fluid (gas or liquid) that the container could hold, rather than the amount of space the container itself displaces.

In ancient times, volume is measured using similar-shaped natural containers and later on, standardized containers. Some simple three-dimensional shapes can have their volume easily calculated using arithmetic formulas. Volumes of more complicated shapes can be calculated with integral calculus if a formula exists for the shape's boundary. Zero-, one- and two-dimensional objects have no volume; in fourth and higher dimensions, an analogous concept to the normal volume is the hypervolume.

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Answer:

Explanation:

1.c

2.j

3.h

4.b

5.f

6.d

7.a

8.i

9.e

10.g

Answer

B) a different number of neutrons in their nuclei.

Explanation

Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table. For example, sodium has eleven protons and is atomic number 11.

Hence, isotopes have a different number of neutrons in their nuclei.

The correct answer is option B) a different number of neutrons in their nuclei.

Answer:

Energy added to solid water will turn it into liquid water; add energy into liquid water and it will be turned into water vapor.

Explanation:

Adding energy is basically adding heat; the more heat, the more excited the molecules of H2O gets. In solid water, the molecules aren't really moving because they don't have a lot of energy, so it is solid. In liquid water (which is water in room temperature), it has a medium amount of energy; the molecules aren't stuck together but it isn't completely dispersed, so it is in liquid form. However, in water vapor, the energy becomes very high and the molecules are excited. The hydrogen bonds holding the molecules together break and the water is released as a vapor.

The maximum mass of water that could be produced by the chemical reaction is 162 g.

The given chemical equation is: 2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)In the chemical reaction of liquid octane with gaseous oxygen, the products are gaseous carbon dioxide and gaseous water.According to the balanced chemical equation, 2 moles of C8H18 react with 25 moles of O2 to form 18 moles of H2O.So, 1 mole of C8H18 react with 25/2 = 12.5 moles of O2 to form 9 moles of H2O.The molar mass of C8H18 is 114 g/mol. So, the number of moles in 17 g of C8H18 is:17 g / 114 g/mol = 0.149 molThe molar mass of O2 is 32 g/mol. So, the number of moles in 112 g of O2 is:112 g / 32 g/mol = 3.5 molFrom the balanced chemical equation, 1 mole of C8H18 react with 12.5 moles of O2 to form 9 moles of H2O.So, the number of moles of O2 required to react with 0.149 mol of C8H18 to form H2O is:(12.5 mol / 1 mol) × (0.149 mol / 2 mol) = 0.935 molThe maximum number of moles of H2O that can be produced from 0.149 mol of C8H18 and 0.935 mol of O2 is 9 mol.So, the mass of water produced from 17 g of C8H18 and 112 g of O2 is:9 mol × 18 g/mol = 162 g

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The mass(in grams) of iron, Fe produced from the 92.5g of iron (ii) oxide, FeO is 71.9 grams

The mass of Fe produced from the 92.5g of iron (ii) oxide, FeO can be obtained as follow:

2FeO → 2Fe + O₂

From the balanced equation above,

143.7 g of FeO reacted to produce 111.7 g of Fe

Therefore,

92.5 g of Fe will react to produce = (92.5 × 111.7) / 143.7 = 71.9 g of Fe

Thus, the mass of Fe produced from the reaction is 71.9 grams

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Complete question:

How many grams of Fe are produced from 92.5 g of FeO given the following reaction 2FeO → 2Fe + O₂

Answer:

hey buddy,This's your answer...!!

Answer:

chemical reaction

Explanation:

Answer:

Making soap can be considered a chemical reaction.

Explanation:

In the process of making soap, a reaction takes place between a fat or oil and an alkali, such as lye (sodium hydroxide), which results in the formation of soap molecules and glycerol. This reaction is known as saponification. The change in the composition of the reactants to form a new substance is a chemical change, not a physical change or a phase change.

Answer:

B)As you go from left to right, reactivity of metals increases. As you go down in a group, reactivity of metals decreases.

Explanation:

reactivity of metals can be explained as how it can easily lose electron, i.e oxidize as well as reaction with non-metals.

There are factors that influence the reactivity of metals such as

1)atomic radius

2)nuclear charge

3)shielding effect

4) The sublevel arrangement of electrons

In the periodic table,the group 1, known as alkali metals, are the most reactive metals

Therefore, as we from left to right, reactivity of metals increases. As we move down in a group, reactivity of metals decreases.

Answer:

Explanation:

The main difference between these two is that a star has a solid rock and gas surface, while a comet has tail of dust and gas. A star is a giant mass of rock and gas that follows a set eliptical path. Comets on the other hand are made of ice and dust with some gases and usually travel in a straight path. This is why they have a tail of dust and gas which is the ice burning up behind it as it travels at extremely high speeds.

Answer: A: A star has a solid rock and gas surface, while a comet has tail of dust and gas.

Explanation:

Answer:

C)Water molecules are arranged closer together when frozen than in a liquid form.

Explanation:

Ice is less dense than water. More molecules are brought closer together and need to be accommodated in a smaller area

Answer: 35℃

Explanation: A gas exerts pressure, the force of the gas particles striking the walls of its container. Gas pressure is measured in units such as torr, mmHg, atm, and Pa.

The idea here is that you need to figure out how many moles of magnesium chloride,

MgCl

2

, you need to have in the target solution, then use this value to determine what volume of the stock solution would contain this many moles.

As you know, molarity is defined as the number of moles of solute, which in your case is magnesium chloride, divided by liters of solution.

c

=

n

V

So, how many moles of magnesium chloride must be present in the target solution?

c

=

n

V

⇒

n

=

c

⋅

V

n

=

0.158 M

⋅

250.0

⋅

10

−

3

L

=

0.0395 moles MgCl

2

Now determine what volume of the target solution would contain this many moles of magnesium chloride

c

=

n

V

⇒

V

=

n

c

V

=

0.0395

moles

3.15

moles

L

=

0.01254 L

Rounded to three sig figs and expressed in mililiters, the volume will be

V

=

12.5 mL

So, to prepare your target solution, use a

12.5-mL

sample of the stock solution and add enough water to make the volume of the total solution equal to

250.0 mL

.

This is equivalent to diluting the

12.5-mL

sample of the stock solution by a dilution factor of

20

.

The value of the equilibrium constant shows the relative amounts or concentrations of the reactants and products.

The concentration (molarity) of the final NaCl solution is 175 M.

To find the concentration (molarity) of the final NaCl solution, we can use the equation:

M1V1 = M2V2

Where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

In this case, we have an initial NaCl solution with a concentration of 2.5 M and a volume of 350 mL (0.350 L). We are diluting this solution to a total volume of 5.0 mL (0.005 L).

Plugging these values into the equation, we have:

(2.5 M) * (0.350 L) = M2 * (0.005 L)

Simplifying the equation:

0.875 = 0.005 * M2

Dividing both sides by 0.005:

M2 = 0.875 / 0.005

M2 = 175M

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The average kinetic energy of the particles is reduced by a factor of (723/819)2 = 0.60, assuming the substance is an ideal gas.

The energy an object possesses as a result of its motion is known as kinetic energy. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The relationship between kinetic energy and an object's mass and square of its velocity is direct.

When an object is moving, it has kinetic energy, which is computed using the formula KE = 1/2mv2, where m is the object's mass and v is its velocity. Calculating the amount of energy required to halt a moving object is just one practical use for the fundamental physics idea of kinetic energy.

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Answer:

Condensation

Explanation:

We can see that H2O is formed when the two molecules join together, which is a characteristic of Condensation polymerization