Calcium crystallizes through cubic closest packing. If the atomic radius of calcium is 197 pm, find the density of the solid.

Answer: B. a ball being held

Explanation: while your holding the ball the potential energy is greater than the kinetic

Answer:

chloroplasts

Explanation:

In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.

Answer:

262.8577 g/mol

Explanation:

The molar mass and molecular weight of Mg3O8P2 is 262.858.

Answer:

The molar mass and molecular weight of Mg3O8P2 is 262.858.

Explanation:

The work needed to isentropically compress 2 kg of steam in a cylinder from 400 kPa and 400°C to 2 MPa is 404.2 kJ.

Work is the energy that is transmitted to or from an item by means of a force acting on it across a distance in physics thermodynamics. It has a scalar value and is measured in joules (J). When an item moves as a result of an applied force, the amount of work is equal to the force times the distance traveled in the direction of the applied force.

To calculate the work needed to isentropically compress 2kg of steam, we can use the first law of thermodynamics:

ΔU = Q - W

where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

For an isentropic process, there is no heat transfer (Q = 0), and the change in internal energy is given by:

ΔU = m × (h2 - h1)

where m is the mass of the steam and h1 and h2 are the specific enthalpies of the steam at the initial and final states, respectively.

To find the specific enthalpies, we can use steam tables or a thermodynamic calculator. For the initial state, at 400 kPa and 400°C, we find:

h1 = 3339.1 kJ/kg

For the final state, at 2 MPa, we find:

h2 = 3541.2 kJ/kg

Substituting these values into the equation for ΔU, we get:

ΔU = 2 kg × (3541.2 kJ/kg - 3339.1 kJ/kg) = 404.2 kJ

Since the process is isentropic, the work done is given by:

W = ΔU = 404.2 kJ

Therefore, the work needed to isentropically compress 2 kg of steam in a cylinder from 400 kPa and 400°C to 2 MPa is 404.2 kJ.

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Your question is incomplete. The complete question is:

What is the work needed to isentropically compress 2kg of steam in a cylinder at 400kPa and 400C to 2 MPa?

Grignard synthesis of the alcohol shown involves the following reaction: CH2CH2Br + Mg + 2(C2H5)2O → CH2CH2MgBr + 2C2H5OHWhen we compare the equation with the reagents available, we can see that it requires CH2CH2Br and two molecules of C2H5OH.

From these, CH2CH2OH is synthesized. As the equation suggests that CH2CH2Br is the alkyl halide used, we can add CH2CH2Br and an aldehyde or ketone as a reactant. To draw the structural formulas for the reaction, follow the below guidelines: Step 1: Add an aldehyde or ketone Aldehydes and ketones are organic compounds containing carbonyl groups. They have the following formula: RCHO (aldehyde) and R2CO (ketone), respectively. An example of an aldehyde is formaldehyde, which has a structural formula HCHO. When we add HCHO to the reaction, the structural formula for the reactant becomes: CH2O.Step 2: Add an alkyl or aryl bromide The next step is to add an alkyl or aryl bromide to the reactant. An alkyl bromide is an organic compound containing a carbon-bromine bond, while an aryl bromide contains a bromine atom attached to an aromatic ring. The simplest example of an alkyl bromide is CH3Br, while the simplest aryl bromide is bromobenzene (C6H5Br). For this reaction, we will add CH2CH2Br as the alkyl bromide. The structural formula for the reactant becomes: CH2CH2Br + CH2OHere is the required structural formula in 100 words. The Grignard synthesis of the alcohol shown in the equation CH2CH2Br + Mg + 2(C2H5)2O → CH2CH2MgBr + 2C2H5OH requires CH2CH2Br and two molecules of C2H5OH. Therefore, we can add CH2CH2Br and an aldehyde or ketone to form the desired alcohol. For this purpose, we will use HCHO as an aldehyde and CH2CH2Br as an alkyl bromide. The structural formula for the reactant will be CH2CH2Br + CH2O.

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Answer:

isotope phosphorus-31

Explanation:

Based on these characteristics, the chemical compound described could potentially be sodium carbonate (Na2CO3). Sodium carbonate is a white crystalline solid, soluble in water, and has a pH around 8.

To identify a chemical composition based on the given characteristics, we can consider the properties and reactions described:

White, crystal solid, dry: This indicates that the compound is a solid substance with a white color and a crystalline structure when in a dry state.

Soluble: This suggests that the compound can dissolve in a solvent, indicating it is likely an ionic compound or a polar covalent compound.

pH ≈ 8: The pH value around 8 indicates that the compound is slightly basic.

Forms a gas when reacted with sulfuric acid and lit: This observation suggests that the compound reacts with sulfuric acid to produce a gas. It could potentially be an acid or a carbonate compound.

Forms a pasty precipitate when reacted with NaOH: The formation of a pasty precipitate indicates that the compound reacts with sodium hydroxide, likely forming an insoluble hydroxide compound.

When reacted with sulfite, it gives a holographic look and smells like chlorine: This characteristic suggests that the compound reacts with sulfite to produce chlorine gas, which exhibits a distinct odor.

Based on these characteristics, the chemical compound described could potentially be sodium carbonate (Na2CO3). Sodium carbonate is a white crystalline solid, soluble in water, and has a pH around 8. It reacts with sulfuric acid to produce carbon dioxide gas and water. It forms a pasty precipitate of sodium hydroxide when reacted with NaOH. When reacted with sulfite, it produces chlorine gas, which can give a holographic appearance and smell like chlorine. However, it is important to conduct further tests and confirmatory experiments to accurately identify the compound.

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Answer: In the core of the Sun hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom. During the process some of the mass is converted into energy.

Answer:

they help people realize their full potential

Explanation:

yes

Answer:

they seek to protect people and their property

Explanation:

Answer: B!!!

Explanation:

Answer:

The general formula for a straight chain alkane is CnH(2n+...so correct option is C and D

During this process, the hexanes in the flask will boil and turn into vapour at their boiling point of 68.73 °C (342 °K). This occurs because the heat being applied to the flask causes the temperature of the hexanes to increase, and when it reaches the boiling point, the liquid will begin to turn into a gas.

The vapour will then rise and escape from the flask. As the vapour exits the flask, it will cool and eventually condense back into a liquid. This process is known as "boiling."

Hexanes in the flask will boil and turn into vapour because of the heat being applied. Vapor rises and escapes from the flask, then condenses back into liquid. This is a boiling process.

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Answer:

A

Explanation:

a. The molality of solution (a) is 0.231 mol/kg.

b. The molality of solution (b) is 0.388 mol/kg.

c. The molality of solution (c) is 0.244 mol/kg.

Molality (m) is defined as the number of moles of solute per kilogram of solvent. We can use the formula below to calculate the molality:

m = moles of solute / mass of solvent (in kg)

a) For solution (a):

moles of solute = 0.455 mol

mass of solvent = 1.97 kg

m = 0.455 mol / 1.97 kg

m = 0.231 mol/kg

b) For solution (b):

moles of solute = 0.559 mol

mass of solvent = 1.44 kg

m = 0.559 mol / 1.44 kg

m = 0.388 mol/kg

c) For solution (c):

moles of solute = 0.119 mol

mass of solvent = 488 g = 0.488 kg

m = 0.119 mol / 0.488 kg

m = 0.244 mol/kg

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Answer:

Unknown 4

Explanation:

yeag

Explanation:

2SrO + 4NO2 + O. The thermal decomposition of strontium nitrate to produce strontium oxide, nitrogen dioxide and oxygen. This reaction takes place at a temperature of over 570°C

Answer:

Al + 3NaOH  = Al(OH)₃ +3Na

Explanation:

The reaction is given as:

            Al + NaOH  = Al(OH)₃ + Na

This reaction is called a single displacement reaction in which one specie displaces another from a solution.

 To balance the equation:

                aAl + bNaOH  = cAl(OH)₃ + dNa

a, b, c and d are the coefficient that will balance the equation:

     Conserving Al;

                 a = c

     Conserving Na;

                b  = d

     Conserving O;

                 b  = 3c

     Conserving H;

                b = 3c

Let a  = 1, c = 1, b = 3 and d = 3

             Al + 3NaOH  = Al(OH)₃ +3Na

Answer:

density = 5 g/ml

Explanation:

D=m/v. Mass=30g and Volume=6mL

SO solve for D when m = 30 and v = 6

D=m/v

D = 30/6

density = 5 g/ml

The mass defect (deficit) in amu/atom is 0.109879 amu/atom of an atom of 105In has a mass of 104.914558 amu.

The mass of an atom is the sum of the masses of its protons, neutrons, and electrons.

The mass of an atom is generally less than the sum of the masses of its subatomic particles.

The difference between the sum of the masses of its protons, neutrons, and electrons and the mass of an atom is

known as the mass defect.

Mass defect = [(Z × mp + N × mn) − M]

where, Z = the atomic number; N = the number of neutrons; mp = mass of proton; mn = mass of neutron; and M = mass of nucleus.

In this case, mass defect = [(49 × 1.007825 + 56 × 1.008665) − 104.914558] amu/atom = 0.109879 amu/atom.

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Pathogenic bacteria are the most problematic in the food industry. The term "pathogenic" refers to any bacteria that are capable of causing illness when consumed by humans or animals.

Option A is correct

Pathogenic bacteria are often found in foods that are not cooked or handled correctly. This includes raw meat, unpasteurized dairy products, and foods that are stored at incorrect temperatures for an extended period of time. It is crucial for food industry professionals to follow strict safety protocols to minimize the risk of pathogenic bacteria contaminating their products, leading to foodborne illnesses.Foodborne illnesses can be caused by a variety of microorganisms, including bacteria, viruses, and parasites. Pathogenic bacteria are a significant concern in the food industry, as they can cause serious illness and even death in vulnerable populations such as young children, pregnant women, and the elderly. The most problematic bacteria in the food industry are those that are pathogenic and are capable of multiplying quickly in the food environment. Pathogenic bacteria can cause food poisoning, which is a severe illness that can result in dehydration, fever, vomiting, and diarrhea.

The symptoms can be severe and can lead to hospitalization or even death if left untreated. The most common pathogenic bacteria found in food are Salmonella, Listeria, and E.coli. These bacteria are often found in raw or undercooked meat, unpasteurized dairy products, and fruits and vegetables that are not washed correctly. It is essential for food industry professionals to follow strict safety protocols to prevent the growth and spread of these bacteria. Proper handwashing, storage, and cooking techniques can help minimize the risk of foodborne illnesses caused by pathogenic bacteria. In conclusion, pathogenic bacteria are the most problematic in the food industry. Food safety protocols should be followed to minimize the risk of foodborne illnesses caused by these bacteria.

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The mass of the piece of cork is determined by its density, which can vary depending on the specific type of cork.

To calculate the mass of the piece of cork, we need to know its density. Density is defined as the mass per unit volume of a substance. However, the question only provides the volume of the cork, which is 35.5 milliliters (ml). Without the density, we cannot directly determine the mass.

To find the mass, we need to multiply the volume by the density of the cork. Density is typically expressed in grams per milliliter (g/ml) or grams per cubic centimeter (g/cm³). Once we have the density, we can use the formula:

Mass (g) = Volume (ml) x Density (g/ml)

Without information about the density of the cork, we cannot accurately calculate its mass. Therefore, we need additional data or specifications to proceed with the calculation.

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0.0225 ml of a 0.900% (m/v) normal saline solution can be prepared from 2.50 g of sodium chloride, nacl . note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v).

C = m/V

0.009 = m/V

0.009 = 2.5/V

V = 2.5/0.009 = 0.0225 ml

To help prevent heat cramps brought on by excessive sweating, sodium chloride is used as an electrolyte replenisher. The normal isotonic solution of sodium chloride can also be made using this medication. This medication is accessible over-the-counter.

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Answer: EADCBCEDBA

Explanation:

1.  E - Moderately to very polar covalent

        Electronegativity (χ) = .84

2. A - Nonpolar covalent

        χ = 0 - There is no electronegativity difference

3. D - Ionic

        χ = 3 - The electronegativity is greater than 2

4. C - Very polar covalent

          χ = 1.55

5. B - Moderately polar covalent

         χ = .76

6. C - Very polar covalent

         χ = 1.4

7. E - Moderately to very polar covalent

        χ=.89

8. D - Ionic

       χ= 2.46

9. B - Moderately polar covalent

       χ = .82

10. A- Nonpolar covalent

      χ = 0 - There is no electronegativity difference

hope this helps :3

The frequency of electromagnetic waves with an energy of 9.89×10-18 J is 1.492 ×10^16 Hz.

What are electromagnetic waves?

These are the waves created due to the vibration caused between two fields, i.e., electric field and magnetic field.

In simple words, it originates from the oscillating magnetic and electric field.  The electromagnetic spectrum gives us a range of frequency, wavelength and Energies.

It is used to classify the electromagnetic waves and arrange them according to their order of frequencies and wavelength.

Frequency = Energy/ Planck's constant

f= E/h

h=6.626×10^-34 J s

⇒9.89×10^-18/6.626×10^-34

⇒1.492×10^16 Hz.

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Answer:

by evaporating the solution leaving the solute (salt) behind after the solvent has evaporated

Answer:

The answer is Ka1

▬▬▬▬▬▬▬▬

When it comes to dissociation, Ka1 is fairly the most even-out level, classifying it as a Weak Acid.

They must be fully separable into ions. If that's the case, you are dealing with a Strong acid.

If this is not the case, that would make the acid Weak.

▬▬▬▬▬▬▬▬

In conclusion, I hope this helps you and I hope you have a great day!

Covalent compounds are named by using numerical prefixes to identify the number of atoms in the molecule. E.g. Mono, Di, tri, tetra, etc.

In the naming, never use mono- for the first element.

The first element keeps its name.

The second element always end in the suffix -ide.

Drop the double vowel for the prefix and the element of the second element in the compound.

Hope this helped!

Answer:

The answer is surface cut by streams.

Explanation:

I just took the quiz and got a 100%

The best phrase that described plateau is "surface cut by streams".

A plateau is a tableland, consisting of an area of a highland made of flat terrain that is raised sharply above the surrounding area on at least one side.

Many plateau are topped with a hard, durable surface called caprock, which protects the plateau from erosion.

Valleys form when river water cuts through the plateau.

Thus, the best phrase that described plateau is "surface cut by streams".

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decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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