4. What is the function of a wind turbine?
a. changing the kinetic energy of wind to electrical energy
b. capturing wind energy and using it to pump water
c. slowing down the wind so it causes less erosion
d. storing the energy of wind as thermal energy

Answer:2. C Hydrochloric acid

Explanation:

Answer:

the answer to #2 ic C. hydrochloric acid.

Explanation:

Potential energy is stored energy that is affected by the relative location of different components of a system. When a spring is squeezed or expanded, its potential energy increases.

Potential energy is the energy retained by an object as a result of its location relative to other objects, internal stresses, electric charge, or other variables.  Although it has ties to the ancient Greek scholar Aristotle's idea of potentiality, the word potential energy was coined by the 19th-century Scottish engineer and physicist William Rankine.

The gravitational potential energy of an object, the elastic potential energy of a stretched spring, and the electric potential energy of an electric charge in an electric field are all examples of common kinds of potential energy. The joule, denoted by the sign J, is the measure of energy in the International System of Units (SI).

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The number of moles of the water that was evaporated is  12083467.5 moles of water.

We know that the number of moles that we have can be gotten as the ratio of the mass to the number of moles of the object. Now we know that from the question, we have the volume of the hydrogen to be 90,000 gallons. We have to convert this volume to liters.

Given that;

1 gallon = 3.79 L

90,000 gallons  = 90,000 gallons  * 3.79 L/1 gallon

= 341100 L

Then we have the density of the hydrogen to be 70.85 g/L

Mass of the hydrogen =  70.85 g/L *  341100 L

= 24166935 g

Number of moles of the hydrogen reacted = 24166935 g/2 g/mol

= 12083467.5 moles

If 2 mole of hydrogen gives 2 moles of water

12083467.5 moles of hydrogen gives 12083467.5 moles of water

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Explanation:

Hope this somewhat helped:

a. The equation for the reaction of weak acid, C6H5CO2H, with water is: C6H5CO2H + H2O <=> C6H5CO2^- + H3O^+. We can assume that all the C6H5CO2H has reacted with water to form C6H5CO2^- and H3O^+.

The pH is defined as -log(H30^+ concentration), where H30^+ is the hydronium ion, a measure of the acidic strength of the solution. At the equivalence point, all the C6H5CO2H has reacted with the NaOH to form C6H5CO2^- and Na^+. The stoichiometry of the reaction can be determined by balanced the reaction using the information given.

C6H5CO2H + NaOH <=> C6H5CO2^- + Na^+

This reaction tells us that one mole of C6H5CO2H will react with one mole of NaOH to form one mole of C6H5CO2^- and one mole of Na^+.

Answer:

your answer is given below

Explanation:

Take it stepwise, and you are going to have to look up the various heat values.

You have 36.5grams of ice, presumably at 0C.  You will need to add heat to take the ice at 0 C to water at 0 C. (Latent heat of melting)  Then you add in a different heat value to take the water at 0 C to water at 82.3 C. (Specific heat of water)

Add the two heat amounts together.

According to specific heat capacity, to calculate the amount of heat needed to melt ice given mass of ices is multiplied by specific heat of ice and the temperature change which it undergoes.

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT

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The statement that accurately describes the photoelectric effect is Shining a HIGH frequency light over a metal will cause ELECTRONS to be ejected. That is option B.

Photoelectric effect is defined as the process by which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.

The photoelectric effect can also be defined as the ejection of electrons from a metal plate when light falls on it.

Therefore, statement that accurately describes the photoelectric effect is Shining a HIGH frequency light over a metal will cause ELECTRONS to be ejected.

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Answer:

it is because all energy are bound to use up according to the law of conversion of energy

Answer:

There are 10.0 moles of beryllium oxide in a 250 grams sample of the compound.

Explanation:

We can calculate the number of moles (η) of BeO as follows:

\( \eta = \frac{m}{M} \)

Where:

m: is the mass = 250 g

M: is the molar mass = 25.0116 g/mol

Hence, the number of moles is:

\( \eta = \frac{250 g}{25.0116 g/mol} = 10.0 moles \)

Therefore, there are 10.0 moles of beryllium oxide in a 250 grams sample of the compound.  

I hope it helps you!

Answer:

two electrons.... oxygen needs two electrons to attain stability

The combination in Option D , NaCl + HCl  is not a buffer

A buffer is a solution which is added to resist changes in pH when a small amount of acid.

It is generally made of weak base with its conjugated acid ,  weak acid with its conjugated base.

A buffer comes with a defined with a capacity .

Among the given option the solution mixture  which is not a buffer is

NaCl + HCl

as a buffer is not made of a strong acid and its salt.

Therefore Option D is not a buffer.

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Therefore, the equilibrium concentrations of CO, Cl2, and COCl2 are:

Generally, To calculate the equilibrium concentrations of each gas at 1000 K, we need to use the equilibrium constant expression for the reaction:

Kc = [COCl2] / [CO][Cl2]

We are given the initial concentrations of CO and Cl2, and the value of Kc at 1000 K.

We can use this information to solve for the equilibrium concentrations of each gas.

First, we can use the initial concentrations to find the equilibrium concentrations of CO and Cl2.

[CO] = 0.4850 M [Cl2] = 0.4300 M

Using the equilibrium constant expression we can find the equilibrium concentration of COCl2

Kc = [COCl2] / (0.4850 M)(0.4300 M) = 255.0

Therefore,

[COCl2] = Kc * [CO] * [Cl2]

= 255 * 0.4850 * 0.4300

= 55.3275 M

At equilibrium, the concentrations of the reactants and products will not change over time.

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The molality of the solution is 1.080 mol/kg of a 48 grams of MgCl2 is dissolved in 500g of water, density of water = 1 kg/1L.

Taking the moles of solute and dividing it by the kilograms of solvent yields the molality of a solution.

Molality is calculated as follows: kg of solvent/kg of solute

500 g, or 0.500 kg, is the mass of the solvent.

MgCl2 molecular weight divided by its mass gives the amount of moles.

48 g / 95.2 g m o l 1 equals the quantity of moles of magnesium chloride.

0.504 moles of MgCl2 are present in one mole.

Molality is calculated as 0.504moles per kilogram.

Molality is equal to 1.080 mol k g 1.

As stated in the definition, molality is the "total moles of a solute contained in a kilogram of a solvent." The terms "molality" and "molal concentration" are synonymous. It is a measurement of a solvent.

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Answer:

it should be rinsed to clean the glassware

Answer:

they are known as halogens

Explanation:

everything else is correct

Answer:

Potential = 0.80 - 0.76 = 0.04 V

Answer:

Explanation:

According to Boyles' law, the volume of a given mass of gas is inversely proportional to its pressure

Mathematically:

Where:

P1 is the initial pressure which is 28.2 atm

V1 is the volume of the cylinder which is:

We convert V1 to liters by multiplying by 0.001 L

That would be:

P2 is the atmospheric pressure which is 1 atm

Substituting the values, we have:

Answer:

380g

Explanation:

Given parameters:

Number of moles of Fluorine  = 20moles

Unknown:

Mass of Fluorine  = ?

Solution:

The number of moles is the unit of quantifying the amount of particles in a substance.

 So;

      Mass of a substance  = number of moles  x molar mass

Molar mass of F = 19g/mol

 Now;

     Mass of F = 20 x 19 = 380g

The relationship between the rate of diffusion r, and d is r ∝ 1/√d.

The relationship between the rate of diffusion (r) and the density of a gas (d) can be explained using Graham's law of diffusion. According to this law, the rate of diffusion of a gas is inversely proportional to the square root of its density. Mathematically, it can be expressed as:

r ∝ 1/√d

where the symbol '∝' represents 'proportional to'. The constant of proportionality (k) can be introduced to this equation as:

r = k/√d

This equation shows that as the density of a gas increases, its rate of diffusion decreases. This is because denser gases have more molecules per unit volume and thus, they experience greater intermolecular collisions that hinder their movement. Therefore, it requires more energy for them to diffuse through a medium compared to less dense gases.

The relationship between the rate of diffusion and density is particularly important in understanding the behavior of gases in different environments. For instance, in a gas chromatography column, the rate of diffusion of a gas determines how quickly it moves through the column and separates from other components. Similarly, in the Earth's atmosphere, the rate of diffusion of greenhouse gases such as carbon dioxide affects their concentration and hence, their impact on climate change.

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The expected lattice energies, in increasing order, are MgO> MgBr2> KBr.  

The ranking is related that the lattice energy being directly proportional to the strength of the ionic bond. If the bond is strong, the lattice energy would be high.

If the intermolecular force is strong, then the energy requires to break the bond would be greater. Thus, the lattice energy would be high.

MgO has the lowest lattice energy because it is the smallest and has the weakest attractive force between the ions. MgBr2 has a slightly higher lattice energy because the bromine ions are larger and have a stronger attractive force than the oxygen ions. KBr has the highest lattice energy because the potassium ions are larger than the bromine ions and have a stronger attractive force.

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The equation MgO + 2HCl → MgCl₂ + H₂O is  a balanced equation.

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Answer:

Hydrogen

Explanation:

Answer:

C)

Explanation:

18 moles of oxygen can be produced by decomposing 12 moles of KClO₃.

The balanced chemical equation for the decomposition of KClO₃ is:

2KClO₃ → 2KCl + 3O₂

According to the equation, for every 2 moles of KClO₃ decomposed, 3 moles of O₂ are produced. So, to determine how many moles of O₂ are produced by decomposing 12 moles of KClO₃, we can use the following proportion:

2 moles KClO₃ / 3 moles O₂ = 12 moles KClO₃ / x moles O₂

where x is the number of moles of O₂ produced.

Solving for x, we get:

x = (3 moles O₂)(12 moles KClO₃) / (2 moles KClO₃)

x = 18 moles O₂

Therefore, 12 moles of KClO₃ can produce 18 moles of O₂.

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123 g sample of water is heated from 52 °c to 87 °c, then heat energy that were used to heat the water is 4281 calories.

Heat energy is the result of movement of tiny particles - atoms, molecules or ions in solids, liquids and gases.

Q = m * c * ΔT

Q is amount of heat energy (in calories), m is mass of the substance (in grams), c is specific heat capacity of the substance (in calories/gram-degree Celsius), and ΔT is change in temperature (in degrees Celsius).

For water, specific heat capacity is 1 calorie/gram-degree Celsius, so we  substitute the values given in the problem and solve for Q:

Q = (123 g) * (1 cal/g°C) * (87°C - 52°C) = 4281 calories

Therefore, 4281 calories of heat energy were used to heat the water.

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Answer:

Molecular compounds are inorganic compounds that take the form of discrete molecules. Examples include such familiar substances as water (H2O) and carbon dioxide (CO2). These compounds are very different from ionic compounds like sodium chloride (NaCl).

The calories provided by a medium sized quarter pounder with cheese value meal from McDonald’s is 1050 calories.

Carbohydrate are defined as carbon, hydrogen, and oxygen atoms make up biomolecules. They are a vital source of energy.

Carbohydrates supply the body with glucose, which is converted into energy for use.

There are three main types of carbohydrates.

Proteins are defined as the large biomolecules and macromolecules consisting of one or more long chains of amino acid residues.

There are seven types of proteins.

Fats are defined as the triglycerides are macronutrient compounds that are an important part of our diet, along with carbohydrates, vitamins, and protein.

Thus, the calories provided by a medium sized quarter pounder with cheese value meal from McDonald’s is 1050 calories.

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Answer:

122 mL of 8.20 M CuCl₂ solution should be diluted to 1.56 L so that 51.0 mL of the diluted solution contains 4.40 g CuCl₂.

The act of reducing the concentration of a mixture or solution by adding solvent.

The diluted solution contains 4.40 g of CuCl₂ in 51.0 mL of solution.

M = mass CuCl₂ / molar mass CuCl₂ × liters of solution

M = 4.40 g / 134.45 g/mol × 0.0510 L = 0.642 M

We have 122 mL (V₁) of 8.20 M (C₁) CuCl₂ solution and want to prepare a 0.642 M (C₂) CuCl₂ solution.

We can calculate the volume of the diluted solution (V₂) using the dilution rule.

C₁ × V₁ = C₂ × V₂

V₂ = C₁ × V₁ / C₂

V₂ = 8.20 M × 122 mL / 0.642 M = 1.56 × 10³ mL = 1.56 L

122 mL of 8.20 M CuCl₂ solution should be diluted to 1.56 L so that 51.0 mL of the diluted solution contains 4.40 g CuCl₂.

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Experiments with cathode rays led Thomson to propose that the electron was a negatively charged particle.

What is meant by cathode ?

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