18. What are two conservation practices that help prevent wind erosion?

covering fields with tarps and building wind barriers

setting up wind generators that absorb high winds

O plant barriers and plowed ridges in fields

O halting agriculture and planting native species

The 0.3101 grams of lithium carbonate must be added to completely neutralize the hydrochloric acid solution.

To determine the mass of lithium carbonate needed to neutralize the hydrochloric acid solution, we need to set up a balanced chemical equation and use stoichiometry.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and lithium carbonate (\(Li_2CO_3\)) is:

2 HCl + \(Li_2CO_3\) -> 2 LiCl + \(H_2O + CO_2\)

From the equation, we can see that two moles of HCl react with one mole of \(Li_2CO_3\). Therefore, we need to find the number of moles of HCl present in the solution and use that to calculate the amount of \(Li_2CO_3\)required.

First, let's calculate the number of moles of HCl in 25.0 mL of 0.335 M HCl solution:

Molarity (M) = moles of solute / liters of solution

0.335 M = moles of HCl / 0.025 L

moles of HCl = 0.335 M * 0.025 L = 0.008375 moles

Since the stoichiometry of the reaction tells us that 2 moles of HCl react with 1 mole of \(Li_2CO_3\) , we can determine the number of moles of \(Li_2CO_3\)required:

moles of \(Li_2CO_3\) = 0.008375 moles / 2 = 0.0041875 moles

Now, let's calculate the mass of \(Li_2CO_3\) required using its molar mass:

Molar mass of \(Li_2CO_3\) = (2 * atomic mass of Li) + atomic mass of C + (3 * atomic mass of O)

= (2 * 6.941 g/mol) + 12.01 g/mol + (3 * 16.00 g/mol)

= 73.891 g/mol

mass of \(Li_2CO_3\) = moles of \(Li_2CO_3\)* molar mass of \(Li_2CO_3\)

= 0.0041875 moles * 73.891 g/mol

= 0.3101 g (rounded to four decimal places)

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Answer:

Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.

The soda in a fridge has more thermal energy than the soda on the kitchen table.

Thermal energy is the total energy possessed by an object due to the motion of its particles. It is directly related to the temperature of the object. When a soda is placed in a fridge, it is exposed to a lower temperature environment. The fridge actively removes heat from the air inside, creating a cooler environment. As a result, the soda's temperature decreases. The decrease in temperature corresponds to a decrease in the average kinetic energy of the soda's particles, which directly affects its thermal energy.

On the other hand, a soda on the kitchen table is exposed to the surrounding room temperature. While the room temperature may vary depending on the location and climate, it is generally higher than the temperature inside a fridge. Consequently, the soda on the kitchen table has a higher temperature, which corresponds to a higher average kinetic energy of its particles and thus a higher thermal energy.

In summary, the soda in a fridge has more thermal energy than the soda on the kitchen table due to the lower temperature environment it is exposed to. The lower temperature corresponds to a decrease in the average kinetic energy of its particles and, consequently, a lower overall thermal energy.

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2m/s^2 is the object’s acceleration.

Describe a force.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects. The force is no longer felt by the two objects when the interaction ends.

According to Newton's second law of motion, the force is equal to the change in momentum divided by the change in time. Force is equal to the mass times the acceleration for a constant mass.

Force ⇒ m.a

F ⇒ 150N

m ⇒ 75kg

a ⇒?

a ⇒ F/m

  ⇒ 150/75

  ⇒ 2m/s^2

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The most stable nucleus among the given options is 60Co, with a half-life of 5.27 years.

The most stable nucleus among the given options is 60Co, with a half-life of 5.27 years. Half-life refers to the amount of time it takes for half of the radioactive material to decay into a stable form. In medical diagnosis, radioactive isotopes are often used as tracers to help detect and diagnose medical conditions. The stability of the nucleus is an important factor to consider when selecting a radioactive tracer because it affects the amount of radiation emitted and how long it will remain active in the body. A more stable nucleus will emit less radiation and remain active for a longer period, allowing for a more accurate diagnosis. Therefore, 60Co is the most suitable option for medical diagnosis as it provides a stable and reliable source of radiation for imaging purposes.

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Answer:

Reasons water is important

Imagine earth without water. The soil, with no water in it and nothing growing on it, would be lifeless, dead, collapsed into dust, sand, clay or rock.

-Water consumption helps lubricate and cushion your joints, spinal cord, and tissues. This will help you enjoy physical activity and lessen discomfort caused by conditions like arthritis.

-Water is a main component of saliva. Saliva also includes small amounts of electrolytes, mucus, and enzymes. It’s essential for breaking down solid food and keeping your mouth healthy.

Answer:

condensation

Explanation:

going from gas to luquid

Answer:

condensation your welcome :)

Explanation:

wow 50 points for this??? TYSM!!!

Thio-free waves have a pH range of around 8.5 to 9.5

Thio-free waves, also known as thio-free perms, are a type of chemical process used to create curls or waves in the hair. Unlike traditional perms, thio-free waves do not contain the chemical ammonium thioglycolate, which can be harsh and damaging to hair.

Instead, thio-free waves use a different type of chemical called cysteamine. This chemical has a gentler pH range, typically between 8.5 and 9.5, making it less damaging to hair than ammonium thioglycolate.

The pH range of a thio-free wave is important because it affects how the chemical process works. pH is a measure of how acidic or alkaline a substance is, with a pH of 7 being neutral. Hair has a slightly acidic pH, usually between 4.5 and 5.5.

When a thio-free wave is applied to the hair, the alkaline solution causes the hair cuticle to swell and open up, allowing the chemical to penetrate and restructure the hair fibers.

If the pH of the thio-free wave is too high, it can cause damage to the hair, such as breakage, dryness, and frizziness. If the pH is too low, the wave may not set properly, resulting in limp or weak curls.

In summary, thio-free waves have a pH range of around 8.5 to 9.5, which is gentler and less damaging to hair than traditional perms containing ammonium thioglycolate. It is important to choose the correct pH range for your hair type and condition to achieve the best results without causing damage.

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Answer:

D. and B.

Explanation:

I got it right on my quiz

The freezing point of the solution is -1.00°C. Freezing point depression of a solution can be calculated using the formula ΔTf = Kf.

Molality, where ΔTf is the change in freezing point, Kf is the freezing point depression constant, and molality is the concentration of solute in mol per kg of solvent.Using this formula, we can first calculate the molality of the solution as follows:molality = (mass of solute / molar mass of solute) / (mass of solvent / density of solvent)mass of solute = 3.46 gMolar mass of X = 3.46 / 160 = 0.0216 molMass of benzene = 160 gDensity of benzene = 0.8765 g/mL = 0.8765 kg/Lmolality = (0.0216 / 100) / (0.16 / 0.8765) = 0.788 mol/kgThe freezing point depression constant (Kf) for benzene is 5.12°C/m.

The change in freezing point isΔTf = Kf × molality = 5.12 × 0.788 = 4.04°CTherefore, the freezing point of the solution will be the freezing point of pure benzene minus the change in freezing point. The freezing point of pure benzene is 5.45°C. So, the freezing point of the solution will be5.45 - 4.04 = 1.41°CBut the freezing point of the solution is given in °C cellsius.

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35.7 x 1atm/760 torr = 0.0470 atm

P(ethene) = P(total) - P(water) = 0.822atm - 0.0470atm = 0.775atm

n= PV/RT = (0.775atm)(0.0854L)/(0.08206L atm mol-1 K-1)(305K) = 0.00264mol.

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Answer:

The food coloring mixes through the hot water faster than it mixes with the cold water. The reason for this is because  in hot water, the water molecules have more energy and are moving faster than the molecules of cold water. This makes it way more easier for the dye to get mixed throughout the hot water.

Explanation:

Answer:

They are products because they are present after the reaction.

Explanation:

A chemical reaction refers to any interaction between two or more chemical species that leads to the formation of new chemical species. The species that interacted with each other are called reactants. They were present before the reaction commenced. The species that were formed after the interaction are called products. They only appear after the reaction.

In cellular respiration, carbon dioxide and water appear after the chemical reactions that take place, hence they are products.

Answer:

They are products because they are present after the reaction.

Explanation:

A Bronsted-Lowry acid is defined by its ability to donate a proton. A Bronsted-Lowry acid is a substance that can donate protons (hydrogen ions) to other substances during a chemical reaction.

In a chemical reaction, a Bronsted-Lowry acid is any species that loses a proton and a Bronsted-Lowry base is any species that accepts a proton.The Bronsted-Lowry definition of acids and bases defines an acid as a substance that donates hydrogen ions (H+) and a base as a substance that accepts hydrogen ions (H+). The Bronsted-Lowry acid-base theory is the most widely used definition of acids and bases, and it defines an acid as a substance that donates a proton and a base as a substance that accepts a proton.In summary, the ability of a Bronsted-Lowry acid is to donate a proton or hydrogen ion during a chemical reaction to another substance or base.

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The answer is option

The reaction:

is a Synthesis reaction, because from 2 different substances it is produced

Answer:

b

Explanation:

The Theoretical temperature ie, Absolute Zero is when "All particles in a sample can never all be moving at once." Hence, Option (A) is correct

What is Absolute Zero temperature ?

It is determined by  ideal gas law;  absolute zero is taken as −273.15 degrees on the Celsius scale (International System of Units), which equals −459.67 degrees on the Fahrenheit scale.

Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin.

The fundamental particles of nature have minimum vibrational motion, retaining only quantum mechanical, zero-point energy-induced particle motion.

According to the laws of thermodynamics,

Absolute zero cannot be reached using only thermodynamic means, because the temperature of the substance being cooled approaches the temperature of the cooling agent asymptotically and a system at absolute zero still possesses quantum mechanical zero-point energy, the energy of its ground state at absolute zero.

The kinetic energy of the ground state cannot be removed.

Therefore,

The theoretical temperature ie, Absolute Zero is when "All particles in a sample can never all be moving at once." Hence, Option (A) is correct

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Answer:

I need an image to help you as best as I can. Hopefully, this gets your attention so I can try to help!

Explanation:

Answer:

The molarity is 1.26 \(\frac{ moles}{L}\)

Explanation:

Molarity is a unit of concentration that is based on the volume of a solution and represents the number of moles of solutes contained in a liter. The molarity of a solution is calculated by dividing the moles of the solute by the liters of the solution and is expressed in units (moles / liter).

\(Molarity=\frac{number of moles of solute}{Volume}\)

You must calculate the number of moles of CuSO₄. So, being:

the molar mass of CuSO₄ is

CuSO₄=63.54 g/mole + 32 g/mole + 4* 16 g/mole= 159.54 g/mole

Then it is possible to apply the following rule of three: if 159.54 g of CuSO₄ are present in 1 mole, 10 g in how many moles are they?

\(moles=\frac{10 g*1 mole}{159.54 g}\)

moles= 0.063 moles

Then:

Replacing in the definition of molarity:

\(Molarity=\frac{0.063 moles}{0.05 L}\)

Molarity= 1.26 \(\frac{ moles}{L}\)

The molarity is 1.26 \(\frac{ moles}{L}\)

a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.

b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.

c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.

d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.

a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.

At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.

b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.

This will give you the U_min for the interaction.

c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).

The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.

This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.

d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.

e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.

This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.

The value of r_s represents the separation at which the attractive force between the atoms is strongest.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.

This will give you the magnitude of the maximum attractive adhesion force between the atoms.

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Answer: The parts of a dry cell battery are as follows: at the center is a carbon rod called a cathode. The cathode is surrounded by an electrolyte paste. The paste and cathode are surrounded by a separator before finally being sealed within a zinc cylinder.

Explanation: A diagram is show below

Answer: the last one:)

Explanation: energy cannot be destroyed but can be transfered

(called energy transfer).

Answer:

Water and carbon. They are important for climate, and they are important for life.

The activation energy of a molecule or compound is the minimum amount of energy that must be added to  to a system to break the bonds of the reactants. Hence, option C is correct.

Reactants are reacting species in a chemical reaction, that gives new products by regrouping atom in reactants. The valence electrons of reactants are participated in a chemical reaction.

Reactants needs some energy to activate themselves lead to effective collision between reactants to result in products. This additional energy required by reactants is called the activation energy.

This energy is needed weaken the intermolecular attraction and electrostatic forces within the atoms of reactants and enabling them to be reactive.

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Answer:

fe

Explanation:

forms one binary compounds with chlorine

Answer:

This explanation could be improved by specifying the two substances being compared and giving more detailed information about their properties, such as their chemical structure, molecular formula, and other physical and chemical characteristics. Additionally, describing why the two substances have different properties, such as differences in bonding type or molecular arrangement, could provide a more comprehensive explanation.

The partial pressure of Xe is 2.60atm

The sum of the partial pressures is equal to the total pressure. Ptotal = P1 + P2 + P3... .To calculate the partial pressure of one of the components of a mixture, subtract the sum of known partial pressures of the other components from the total pressure.

Given the values of

PHe=0.20 atm

PAr=0.20 atm

Ptotal=3.00 atm

We need to find  PXe

Solution: Determine the sum of the partial pressures of helium and argon, then subtract the sum from the total pressure.

PHe+PAr =0.20 atm + 0.20=0.400 atm

PXe=3.00atm−0.400=2.60 atm

Each gas that makes up a mixture of gases has a partial pressure, which is the notional pressure of that gas as if it alone filled the original combination's complete volume at the same temperature.

According to Dalton's Law, a perfect gas mixture's total pressure equals the sum of its constituent gases' individual partial pressures.

The thermodynamic activity of a gas's molecules is gauged by its partial pressure.

Gases react, disperse, and dissolve based on their partial pressures rather than the concentrations they have in liquids or other gas combinations.

This general characteristic of gases holds true in biological chemical interactions involving gases.

Hence the partial pressure of Xe is 2.60atm

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