highlight all the atoms of the four functional groups by clicking on them. when you click on each atom, it will change color. to deselect an atom, click on it again. do not highlight any bonds.

Answer:

Liquid B is expected to be at the top while liquid A is found at the bottom.

What is density?

The term density has to do with the ratio of the mass of a substance to its volume. Now given that the density of a substance actually shows how much heavy the substance is, it is not difficult to understand that a material that has a low density will flat at the top of a material that has a lower density.

Here we are told that the two liquids do not mix. If they do not mix then it follows that they must have formed a two phase system in which one is at the top of the other. The one that is at the top must have the lower density.

Thus, liquid B is expected to be at the top while liquid A is found at the bottom. From the density of the plastic cue, the cube will be at the top.

Explanation:

The order of the materials from the top to bottom in the cylinder would be Mineral oil, water, rubber stopper, lead, and mercury.

The density of a substance can be measured as the mass per unit volume. The average density will be equal to the total mass of the object divided by its total volume.

The formula for the density of the substance can be expressed as follows:

Density = Mass/Volume

The S.I. unit of the density can be written as Kg/m³. The density of a substance is an intrinsic characteristic as it doesn't depend on its size. If the size increases, the mass of the object increases as well but the density of the object remains constant.

Given, the materials water, mercury, mineral oil, rubber stopper, and a piece of lead have a density of 1.0 g/ml, 0.83 g/ml, 13.5 g/ml, 1.51 g/ml, and 11.33 g/ml respectively.

Therefore, the substance with the least density will stay at the top of the cylinder and the material with the greatest density will at the bottom of the cylinder.

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Cholesterol ester is formed through the esterification of the alcohol cholesterol with fatty acids. The correct option is c.

Cholesteryl esters are sterol lipids that belong to the group of cholesterol lipids. Their structure is made up of cholesterol, which forms an ester bond between the hydroxyl group of the steroid structure and a fatty acid.

When a carboxylic acid interacts with an alcohol, esterification appears to occur. Only in the appearance of an acid catalyst and heat can this reaction take place.

Esterification is the process of combining an organic acid and an alcohol to produce an ester and water, or a chemical reaction that produces at least one ester product.

Thus, the correct option is c.

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The mole fraction of hydrogen is 0.55.

The volume of oxygen = 5 litres

The pressure of oxygen = 2 atm

The volume of hydrogen = 3 litres

The pressure of hydrogen = 4 atm

The universal gas constant is R.

R = 8.31 J mol—¹ K—¹

The ideal gas equation is,

PV = nR T

The number of moles of oxygen is,

PV = nRT

[tex]n = \frac{ PV }{RT }[/tex]

[tex]n = \frac{2 \times 5}{8.31 \times 273} [/tex]

n = 0.004 moles

The number of moles of oxygen is 0.004 moles.

The number of moles of hydrogen is,

PV = nRT

[tex]n = \frac{ PV }{RT }[/tex]

[tex]n = \frac{4 \times 3}{8.31 \times 273} [/tex]

n = 0.005 moles

The number of moles of hydrogen is 0.005 moles.

The mole fraction of hydrogen is,

[tex]Mole \: fraction = \frac{ Moles \: of \: solute }{Total \: number \: of \: moles \: of \: solute \: and \: solvent}[/tex]

[tex]Mole \: fraction = \frac{0.005}{0.009} [/tex]

= 0.55

Therefore, the mole fraction of hydrogen is 0.55.

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The concentration of the substrate is found to be 1.66mm.

Given that the Km of enzyme is 5mm.

Vo =Vmax/4

We know that the formula for Vo

Vo = Vmax[S] /[S] +km

Vmax/4 = Vmax[S] /[S] +km

1/[S] = [S]/ [S] + Km

[S] + Km = 4[S]

Km = 3[S]

[S] = km/3

=5/3mm

[S]= 1.67mm

Thus, the concentration of the substrate is found to be 1.66mm.

The substrate concentration at which half of the enzyme active sites are saturated with the substrate is known as the Km value.  The relationship between the value of KM and the enzyme’s affinity for its substrate is inversely proportional.

It provides information regarding the substrate affinities of enzymes. Km is the substrate concentration at which half of Vmax is reached. One can determine if a given enzyme-substrate system needs more enzymes or substrate to speed up the enzymatic reaction by knowing the Km value of the system.

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In the skeletal structure for an organic compound, it is assumed that there is a atom at the end of any two lines and at the junction of any two lines is Carbon atom. This type of strucutre omits all atoms is Hydrogen atom except those directly bonded to a hetero atom.

The skeletal structure or line formula or shorthand formula for organic compound is a type of molecular structural formula in which line represents  the position of carbon and hydrogen atom. the position of carbon atoms in skeletal are indicated by the ends and intersection of lines and hydrogen atom inferred from the no. of bonds shown to each other.( carbon atom must have four bond ).

The atoms other than carbon and hydrogen are called as hetero-atoms. In skeletal structure we can omit all the atoms of hydrogen except those directly bonded to a hetro atom.

Thus,In the skeletal structure for an organic compound, it is assumed that there is a atom at the end of any two lines and at the junction of any two lines is Carbon atom. This type of strucutre omits all atoms is Hydrogen atom except those directly bonded to a hetero atom.

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Answer:

True

Explanation:

It may not produce other candles but it does produce a flame as a product

[tex]N_{2} O_{4}[/tex] is the molecular formula.

Multiplying the subscripts  [tex]N O_{2}[/tex] by 2, the molecular formula is

2[tex]N O_{2}[/tex] = [tex]N_{2} O_{4}[/tex]

[tex]N_{2} O_{4}[/tex] is the molecular formula.

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People in 1970s were reluctant to embrace nuclear power. For Americans to favor a greater reliance on nuclear power as a source of electricity today, one of the main reason is that it produces high amounts of electricity without damaging the environment and atmosphere.

Nuclear power plants do not produce pollution or produce less pollution, when compared to many other energy sources, whether coal or natural gas, etc.

Nuclear power also protects the quality of air by producing the huge amounts of electricity which is carbon-free.

Traditional fossil fuels like coal, etc produces greenhouse gas emissions like methane and CO₂.

Nuclear power is not expensive. Power plants are cheap to run than others. The amount of energy produced is also efficient and more than others.

Nuclear power plants can run without any interruptions or high maintenance, which makes it a more reliable source of energy.

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Answer:

Option 3

Explanation:

Because electrons have the same charge, they repel. So, if possible, the electrons should be in different orbitals.

Answer:

A because its A

Answer:

A is 5.67 x 10x10x10 B is 0.567 x 10x10x10x10

Answer:

This is a unclear answer.

Explanation:

N/a

Answer:

The organism is unicelluar

Explanation:

The organism is unicelluar because we weren't told The type of Microscope the biologist made Use of .

Answer:

A

Explanation:

Trust me bro :) I just know it

The ways in which metals can be protected from corrosion include the following below:

This is common with metals and is a process which occurs as a result of its exposure to the surroundings. This results in metals forming a stable oxide thereby leading to the deterioration of the material.

There are however several ways to protect them from corrosion such as painting and the use of corrosion inhibitors such as chromates etc which helps to coat it and prevent the oxidation process from occurring thereby making it the correct choice.

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Answer:

false

Explanation:

Answer:

Explanation

Sound waves need to travel through a medium such as solids, liquids and gases simply to put in short terms

Answer: Sound waves need to travel through a medium such as solids, liquids and gases. The sound waves move through each of these mediums by vibrating the molecules in the matter. The molecules in solids are packed very tightly

Explanation:

pls mark me brainliest

There are mainly three types of state of matter and they solid, liquid as well as gas. Gas molecule has no any attraction force on the other hand solid molecule has strong attraction force.

There are four different states of matter: solids, liquids, gases, as well as plasma. Adding or subtracting heat energy from a substance can frequently modify the state of matter in that substance. For instance, adding heat may cause ice to melt into liquid water as well as water to scald.

A condition of a substance known as gas entirely conforms to the form of the container it is placed in despite having no shape of its own. Solids have a defined shape as well as volume, whereas liquids just have a defined volume as well as no shape, and gases lack both shape and volume.

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The first halogenation is the slowest because the first radical intermediate is the highest in energy.

A molecule undergoes halogenation when a hydrogen atom is swapped out for a halogen atom. It should be clear from a review of the two steps that make up the free radical chain reaction for halogenation that the first step (hydrogen abstraction) is the product-determining step.

Fluorine, chlorine, bromine, and iodine are together known as halogens. These elements are frequently handled as a unit because of their shared behavior. Therefore, replacing any number of hydrogen atoms with any or all of the group members is referred to as halogenation.

Once a carbon radical is formed, subsequent bonding to a halogen atom (in the second step) can only occur at the radical site.

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The balanced chemical equation of solid rubidium with liquid water is

2Rb     +    H₂O -------->   2RbOH  +  H₂

Rubidium is an alkali metal reacts rapidly with water to form a colourless solution of rubidium hydroxide (RbOH) and hydrogen gas.

The reaction is so fast that if reaction takes place in a glass container it will shatter the container.

Balancing a chemical equation is involves the stoichiometric  coefficient to the reactants side and products side.

Rb   + H₂O   ------->    RbOH   +    H₂

NOW,       Reactants           and        Products

         Rb        1                                          1

         H          2                                         3

         O          2                                         2

Multiply 2 with Rb , H₂O and RbOH

2RbOH  +   2H₂O  -------->  2RbOH    +   H₂

                Reactants           and        Products

         Rb        2                                       2

         H          4                                        4

         O          2                                        2

The equation is now balanced.

The balanced chemical equation of solid rubidium with liquid water is

2Rb     +    H₂O -------->   2RbOH  +  H₂

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Answer:

A variable is anything that can change or be changed. In other words, it is any factor that can be manipulated, controlled for, or measured in an experiment.

The order of decreasing rate of effusion of gases is as follows:

Hydrogen, Neon, Oxygen, and Argon.

According to Graham's law:

"The rate of effusion (r) is inversely proportional to the square root of the molecular mass (M) of the gas and is directly proportional to the speed of its movement."

So, [tex]r[/tex] ∝ [tex]\frac{1}{\sqrt{M} }[/tex]

This indicates that lighter gases will diffuse more quickly.

Now, the molecular mass of H₂= 2g

The molecular mass of O₂ =32g

The molecular mass of Ar = 39.94g

The molecular mass of Ne = 20.17g

Therefore, the rate of effusion is highest in Hydrogen and lowest in Argon.

Hence, the order of decreasing rate of effusion of gases is as follows:

Hydrogen, Neon, Oxygen, and Argon.

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If there are the three different compounds present in three test tubes with approximately same melting points.

Melting point, temperature at which the solid and the liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until melting point is reached. More heat then will convert solid into a liquid with no temperature change.

When all solid has melted, the additional heat will raise the temperature of the liquid. The melting temperature of crystalline solids is a characteristic figure and is used to identify the pure compounds and elements. Most mixtures and amorphous solids melt over a range of the temperatures.

The melting temperature of a solid is generally considered to be same as the freezing point of the corresponding liquid; because a liquid may freeze in different crystal systems and because the impurities lower the freezing point, however, the actual freezing point may not be the same as the melting point. Thus for characterizing a substance, melting point is preferred. See also melting.

If there are the three different compounds present in three test tubes with approximately same melting points. Firstly, if the melting point of each sample has been recorded thrice. It will result small difference in the readings. along with this is not necessary that three compounds with nearly same melting point have same solubility. The three components can be identified as different from their solubility in the various solvents.

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The student's measurement of the boiling point of water can be described as inaccurate but precise.

Accuracy is the degree of conformity of a measure to a true or standard value i.e. the closeness to a true or standard value.

On the other hand, precision is the ability of a measurement to be reproduced consistently i.e. closeness of measured values.

According to this question, a student performs a lab and is trying to find the boiling point (273K) of water but gets the close measured values above.

This suggests that the student's measurement are not accurate because they are not close to the standard value (273K) but are precise because they are close to one another.

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Answer:

Sort of

Explanation:

Each element is unique (forget isotopes for a while), and so, you would expect them to each have unique properties, and you would be right. They each have their properties that belongs to them alone.

But chemists soon found out that some of them even though unique actually share some similarities, like some of them reacting the same way with another given element in very specific proportions, or that some of them had tendencies that other elements didn´t have.

This realization led to creating a table where every atom in a same column had these similar properties, and, by organizing them in order of atomic weight, they found out many other properties that certain regions had. They also noticed that this arrangement led to properties changing quite consistently when you traveled from a point to the other of the table.

This was such a huge huge discovery that, even before we had the heavy duty machinery to identify atoms, and some of them were still to be found, chemists could pinpoint that we still had some to find because, when organizing them, we realized that there were holes, that would be later be filled by an yet undiscovered element.

Also, this table is so powerful that we are 100% sure that we won´t find any more elements before the smallest nor in between the ones already discovered, at most, we can find bigger elements in some crazy star that has super duper harsh conditions that may stabilize bigger ones. I think there are some questions in Quora where physicists (wizard people) discuss this possibility

The number of neutrons in atoms of different elements can be the same

Answer:

The Earth has multiple layers in its complex atmosphere, five to be more specific. The layer closest to the surface of the Earth is the troposphere, than comes the stratosphere, the mesosphere, the thermosphere, and top layer is the exosphere.

In the troposphere we have the occurrence of the weather.

In the stratosphere we have the occurrence of the ozone layer, which protects the Earth from the ultraviolet radiation.  

The mesosphere is the layer where most of the asteroids burn up in the atmosphere, thus breaking them apart and protecting the surface of the Earth.

In the theromsphere we have the occurrence of the aurora borealis and aurora australis.

In the exosphere we have escaping molecules from the atmosphere, because they are so far away from one another, they get out into the open space.  

Explanation:

Answer: The cycle, which occurs in the troposphere, begins as the sun evaporates large amounts of water from the earth's surface and the moisture is transported to other regions by the wind. As air rises, expands, and cools, water vapor condenses and clouds develop.

Explanation:

Answer:

0.199(10.013) +0.801(11.009)=10.811

The average atomic mass of the new element is equal to 10.811 a.m.u. The new element could be Boron as the average atomic mass of the Boron is also 10.811 a.m.u.

The average atomic mass is the sum of the masses of its isotopes multiplied by their natural abundance. Average atomic mass can be written on the periodic table.

The formula to determine the average atomic mass as follows:

The average atomic mass = ∑(Isotope mass × Natural Abundance)

Given, the abundance of the isotope with an atomic mass of 10.013 is 19.9%. The abundance of the isotope with an atomic mass of 11.009 is 80.1%.

The average atomic mass of element = 10.013  × 0.199 + 11.009 × 0.801

                        Average atomic mass  = 1.992 +  8.818

                                                                = 10.811 a.m.u.

Therefore, the average atomic mass of the new element is 10.811 a.m.u.

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A drop of medication is delivered to a patient every 45 s . if 5 drop of this medication occupy 1.0 ml then the medication will be delivered in 15 sec is 4 ml.

According to the question,

1 drop delivered = 45 sec = 0.75 min

and, 5 drop contains = 1.0 ml

then , 1 drop = 1 / 5 ml = 0.2 ml

this mean, 0.2 ml in = 0.75 min

so, how much ml in 1 min,

1 min = 0.2 ml / 0.75

        = 0.266 ml

now, how many ml in 15 min ,

in 15 min = 0.2667 ml × 15

              =  4 ml

Thus, A drop of medication is delivered to a patient every 45 s . if 5 drop of this medication occupy 1.0 ml then the medication will be delivered in 15 sec is 4 ml.

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Answer:

39.2

Explanation:

1.75 moles × 22.4 liters = 39.2

The scientist who came up with the first widely recognized atomic theory is John Dalton.

The first thorough effort to categorize all matter in terms of atoms and their characteristics was Dalton's atomic theory.

Dalton based his hypothesis on the laws of mass conservation and constant composition. It has the following aspects:

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A radioactive substances has half- life period of 30 days. the time required for 3/4th of the original number of atoms to disintegrate is 60 days.

Half life of radioactive substances T = 30 days

Time required for 3/4th t = ?

no. of atoms disintegrated = ( 3 / 4 ) N0

no. of atoms left after time t,

N = N0 -( 3/4) N0

    = ( 1/4 ) N0

no. of half lives in time t ,

n = t / T

  = t / 30

no. of nuclei after n half life is ,

N = N0× [tex](1/2)^{n}[/tex]

now, comparing both the equations,

[tex]N_{O}[/tex] / 4 = [tex]N_{O}[/tex] ( 1/2 )[tex]^{t/30}[/tex]  =  ( 2 )[tex]^{t/30}[/tex]

therefore,

[tex](2)^{2} = (2)^{t/30}[/tex]

now,

t/30 =  2

t = 60 days.

Thus, A radioactive substances has half- life period of 30 days. the time required for 3/4th of the original number of atoms to disintegrate is 60 days.

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