b. Change the following sentences from passive to active
i. The kids have served the family with dinner.
ii. The police have been watching the house for weeks.
iii
. I was doing my homework when the lights went off.​

Phosphatidylserine is a type of phospholipid that is mainly found in cell membranes. Its structure is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule.

The fatty acid chains are hydrophobic, meaning they repel water, while the phosphate group and serine molecule are hydrophilic, meaning they attract water.

The glycerol molecule acts as a bridge that connects the two fatty acid chains to the phosphate group and serine molecule.
The structure of phosphatidylserine is important for its function in the cell membrane.

Because of the hydrophobic and hydrophilic components of its structure, phosphatidylserine is able to form a lipid bilayer, which is a barrier that separates the inside of the cell from the outside environment.

The hydrophilic heads of the phosphatidylserine molecules face outward and interact with water, while the hydrophobic tails face inward and repel water.
Phosphatidylserine also plays a role in cell signaling and apoptosis, which is programmed cell death.

It acts as a signaling molecule by binding to proteins that are involved in cellular pathways.

In addition, phosphatidylserine is translocated to the outer leaflet of the cell membrane during apoptosis, which signals to immune cells that the cell is ready to be removed.
In conclusion, the structure of phosphatidylserine is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule. Its hydrophobic and hydrophilic components allow it to form a lipid bilayer in cell membranes, and it also plays a role in cell signaling and apoptosis.

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The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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The molar mass of hydrogen sulfide is 34.1 g/mol.

To begin, rearranging the equation to determine the number of moles in this solution. No. Molarity (M) x Volume (L) = 0.5 x 2. = 1 mol.

The molar mass of NaCl is 58.44 g/mol. We may now utilize the rearranged equation. (g) = No. 1 x 58.44 = 58.44 g. Moles (mol) × Molar Mass (g/mol) = 1 x 58.44 = 58.44 g.

1 milliliter = 1 gram of water. The weight of the other components varies. 1 mL of milk equals 1.04 g, 1 mL of flour = 0.53 g, and 1 mL of sugar equals 0.85 g.

The concentration represents the solution’s mass concentration, which is represented in density units (often g/l or g/ml). Molar mass is the mass of one mole of a substance.

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The volume of the radiator solution formed with the 197 mL of antifreeze is 788 mL.

A percentage is given as the respective ratio of the quantity present with respect to others.

The solution of 25% v/v can be depicting the presence of a 25% volume of antifreeze in the radiator solution.

The volume of the radiator solution has 197 mL of antifreeze. The total volume of the solution suppose is x.

25% of x = 197 mL

25/100 * x = 197

x = 788 mL

The volume of the radiator solution formed with 25% v/v antifreeze is 788 mL.

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Answer:

Boils first >Pentane at high altitude> Hexane at high altitude>hexane at sea level> hexanol at sea level> boils last.

Explanation:

Step 1: To boil, a liquid must overcome the attractive forces between molecules and the outside pressure pushing down on the liquid's surface.

(Hexanol> Hexane> Pentane)

Step 2: Identify which situation is most conducive to boiling

To boil, a liquid must overcome the attractive forces between molecules and the outside pressure pushing down on the liquid's surface.

In which situation would you expect the liquid to boil first, assuming equal heating.

(weak intermolecular attraction and low atmospheric pressure)  

Answer: Chemical change

Explanation:

Physical change is a change where there is a change in size , shape etc and no new products are formed.

Chemical change is a change where there is a change in chemical composition as new products are formed.

Example: Formation of soap and glycerin from fat and sodium hydroxide is a chemical change as the chemical bonds are getting rearranged to form new products.

Answer:

According to Coulomb’s law, the electric force between two identical negative charges is inversely proportional to the square of the distance between them. This means that as the distance between the two charges decreases, the electric force between them will increase. Since the charges are both negative, they will repel each other, so as they move closer together, the repulsive force between them will become stronger.

Explanation:

4. The process which leads to transition from the above task are as follows:

5. The two processes that cause transition from each given below:

6. The major reason why water shortages are the problems for many people around the world is simply because of climatic change which alters the weather of a given place at a period of time, thereby leading to water insufficiency.

Melting refers to a chance of state of matter which refers to the process whereby a solid substance changes to liquid.

From the context of the above task, river ice melts into river in a process known as melting.

In conclusion, we can now deduce from the explanation given above that transition is a process which involves the change in form of matter.

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Answer:

 1.5 Molar solution in KCl

Explanation:

Definition of molarity => moles of solute / Volume of solution in Liters

Given 3.00 moles of solute dissolved in 2Liters of solution

Molarity of [KCl] = 3.00 moles KCl / 2Liters solution = 1.5 Molar solution in KCl

Answer:

The main function of the immune system is to provide immunity to the body. Immunity is the body's ability to protect itself from the pathogens it is exposed to. Immunity depends on the body's ability to differentiate between things that belong in the body and those that do not. The immune system's first line of defense includes physical and chemical barriers that are always ready and prepared to defend the body from infection.

The skin acts as a barrier against pathogens. Some structures of the first line of defense include the skin, mouth, eyes, ears, nose, and stomach. The skin produces sweat and oil that work together to keep pathogens from the entering the body. Saliva and tears contain substances the can destroy pathogens. The ears and the stomach help fight pathogens.The ears produce ear wax that prevent pathogens from entering the ears. The stomach produces a liquid the kills pathogens.

Mucus is produce by the nose, lungs, throat, and stomach. Mucus traps pathogens. Mucus also prevent pathogens from getting into deep tissues. Anyway, the very first line of defense against any invasion of the human body is a set of physical barriers between the inside of the body and the outer world.

*my notes from edge2020*

Hope this helps ^-^

Answer:

what happened to it, have the gone extinct

In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

Thus,  Although they require very large sample sizes, hydrometers are rather simple to operate. Usually, 300 to 500 ml per measurement are required. Hydrometers frequently require calibration off-site as well.

With measurements taken by eye, user error is a major issue, and temperature management is especially challenging. Inaccurately bringing and maintaining samples at temperature might take a long time, and once more, user perception of temperature levels is used to determine temperature levels.

Pycnometers and hydrometers have a further problem in that the findings of alcohol measurement are challenging to evaluate and record.

Thus, In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

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The mass of the cereal that you would need to consume can be obtained as 84.8 g

The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.

Number of moles of sucrose in the cereal = 11g/342 g/mol

= 0.03 moles

Now;

0.03 moles of sucrose is contained in 60 g of cereal

0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles

= 84.8 g

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Answer:

Why do chemists use the mole as a counting unit? Because chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance. ... The discovery enabled scientists to classify certain chemical reactions as transfers of electrons between atoms.Explanation:

Chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance.

It is not possible to vell with a single atom or molecule because we

can't count them.

Chemists have set a number of particles with which to toil that is convenient. As molecules are very small.

Thus,  chemists use a counting unit called the mole to measure the amounts of a substance.

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The balanced equation for the coupling reaction of bromobenzene on the metal surface to form biphenyl is mentioned below.

The coupling reactions are a class of chemical reactions where unification of two or more hydrocarbons coupled  with the help of a metal catalyst.

(a) The balanced equation for the coupling reaction of bromobenzene on the metal surface to form biphenyl is:

2C₆H₅Br + 2Na → (C₆H₅)₂ + 2NaBr

(b) The balanced equations for the reactions of phenylmagnesium bromide and trityl fluoborate with water are:

PhMgBr + H₂O → PhH + MgBrOH

Trityl fluoborate + H₂O → Trityl alcohol + HBF₄

Therefore, the balanced equations are given above.

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Answer:1. metyletevinyl

4. (Z)-3-hydroxypropenal

Explanation:

Answer: 0.052moles

Explanation:

number of moles = given mass (g) / molar mass(g/mol)

n=m/M

n= 5.2g/ (40 + 12 + 48)g/mole

n=5.2g/100g/mol

n=0.052 moles

Answer:

208.125g

Explanation:

Given parameters:

 Number of moles of HCl = 3.75moles

Unknown:

 Mass of CaCl₂ that will be produced = ?

Solution:

The reaction equation is given as:

  2HCl  + Ca(OH)₂   →   CaCl₂ + 2H₂O

Now, to find the mass of CaCl₂, we have to work from the known to the unknown.

The known specie here is the number of moles of HCl;

        2 mole of HCl will produce 1 mole of  CaCl₂

       3.75moles of HCl will produce \(\frac{3.75}{2}\)   = 1.875moles

The mass of  CaCl₂;

  Mass of  CaCl₂ = number of moles of  CaCl₂ x molar mass

Molar mass of  CaCl₂ = 40 + 2(35.5) = 111g/mol

  Mass of  CaCl₂ = 1.875 x 111 = 208.125g

Answer:

Mars and Orbital code saber and the alien

The number of mole of O₂ produced from the decomposition of H₂O₂ is 0.0033 mole

We'll begin by obtaining the mole of H₂O₂ that decomposed. This is obatined as follow:

PV = nRT

Divide both sides by RT

n = PV / RT

n = (0.978 × 0.082) / (0.0821 × 300)

n = 0.0033 mole

Finally, we shall determine the number of mole of O₂ produced. This is illustrated below

H₂O₂ -> H₂ + O₂

From the balanced equation above,

1 mole of H₂O₂ decomposed to produce 1 moles of O₂

Therefore,

0.0033 mole of H₂O₂ will also decompose to produce = 0.0033 mole of O₂

Thus, number of mole of O₂ produced from the reaction is 0.0033 mole

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Between the plates, the electric field is constant everywhere. The fact that the electric field vectors are uniform in size and direction serves as a clue. E1 = E2 = E3 = E4 = E5.

A radially outward (inward) pointed electric field is being produced by a positive (negative) point charge. By definition, the electric field's direction corresponds to the force acting on a positive test charge.

A curve has an arrow on it. Determining the electric field's direction from the two potential directions suggested by a tangent to the curve is obviously necessary.

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Answer:

the answer is 3.13

Explanation:

2N2 + 5O2 --> 2N2O5, 1.25 miles of nitrogen requires ___ moles of oxygen

In order to find the result we will have to do some stoichiometry in this question, first we need to set up the reaction:

3 NO2 + H2O -> 2 HNO3 + NO, the reaction is already properly balanced, but there could be some stoichiometry questions in which you need to balance it first

Now, we have 60 grams of NO2, and we want to know how many grams of NO will be produced, let's check the molar ratio between the two compounds

If we have 3 moles of NO2 we will end up with 1 mol of NO, therefore the molar ratio is 3:1

a. The calories increase by 9:00 whenever the running speed goes up by two. so so if a dog were running at 10 km/h it would be 54 calories burnt

b. they are multiplied by 9

Answer: SiO2 has more electrons and stronger London dispersion forces.  

Answer:

the number of electrons in an atom of an element is always the same as the number of protons in its nucleus

The number of electrons in an atom of an element being always the same

as the number of protons in its nucleus is False.

This is a sub-atomic particle which is negatively charged and is usually

involved in chemical reactions.

Electropositive elements donates electrons while electronegative

elements accepts electrons during chemical reactions which is why the

number of proton and electron aren't always the same.

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The molecular or formula mass of each of the given substances is given below:

(a) P₄ = 128 amu

(b) H₂O = 18 amu

(c) Ca(NO₃)₂ = 124 amu

(d) CH₃CO₂H (acetic acid) = 60 amu

(e) C₁₂H₂₂O₁₁ (sucrose, cane sugar) = 342 amu

The molecular or formula mass of a substance id the sum of the masses of the atoms of the elements present in that substance.

The molecular or formula mass of each of the given substances is determined as follows:

(a) P₄ =  32 * 4

P₄ = 128 amu

(b) H₂O = 2 * 1 + 16

H₂O = 18 amu

(c) Ca(NO₃)₂ = 40 + (14 * 2 + 16 * 3 * 2)

Ca(NO₃)₂ = 124 amu

(d)  CH₃CO₂H = 2 * 12 + 4 * 1 + 16 * 2

CH₃CO₂H = 60 amu

(e) C₁₂H₂₂O₁₁  = 12 * 12 + 1 * 22 + 16 * 11

C₁₂H₂₂O₁₁ = 342 amu

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The light colored panel reflects light and heats up, while the dark colored panel absorbs the light and stays cooler. This temperature difference causes the vanes to spin.

The dark panel absorbs the incoming light, while the light panel reflects it. Due to this, the two panels' temperatures differ, with the dark panel becoming hotter than the light panel.

Due to the pressure difference caused by the temperature difference, air molecules move from the hot, dark panel to the cool, light panel. The radiometer's associated vanes spin as a result of this air flow.

The radiometer will spin more quickly the greater the temperature differential between the two panels. The temperature differential between the two panels is higher in a vacuum, enabling the radiometer to spin more quickly.

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