what substances serve many purposes in the purposes in the attempt to move molecules across a plasma membrane

The term that can be used to describe this model element compound or molecule is compound. The correct option is b, compound.

Chemical Compounds are substances that are made by joining two or more chemical elements or substances. Compounds are always made of two or more elements.

The picture is given of ammonia, which is made up of nitrogen and hydrogen. The formula of ammonia is NH₃. The compounds are made up of the joining of molecules that are the smallest unit of these compounds.

Thus, the term that will use is compound. The correct option is b.

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The missing image is added below:

This statement is true.

Amphiprotic species means molecule or ion which can either donate or accept a proton depending on their circumstances. we identify the amphiprotic species it must contain hydrogen atom that can be released a proton. it also must be capable of accepting proton from the compound. amphiprotic species must also have lone pair of valence electron and a hydrogen atom that can be donated as a proton H+

So it is true.

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Dependent variable - backpack produced

Independent variable -  types of cloth

Control group - backpack without cloth.

In an experiment, you have the dependent and the independent variable. The independent variable is the variable that we have to change in the experiment. The independent variable is the variable that changes as we change the values in of the independent variable.

Now, we can see that the experiment is about testing which type of cloth is best for backpacks. The independent variable in this case has to be the types of cloth while the dependent variable is the backpack produced. The control group is the backpack without cloth.

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Answer:

1 Answer. fruity · Stefan V. The answer is 2.5 g/cm3 .

Explanation:

The difference between Macro and Micro soil organisms is that macro soil organisms can be seen through the eyes but micro soil organisms cannot be seen through the eye, they can be seen under the microscope. Micro organisms are called soil / micro flora while macro organisms are called soil / macro fauna.

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The reasonable ground - state electron configuration is 1s² 2s²2p⁶

1) Electron configuration is defined as the arrangement of electron in the atomic orbtials.

2)The ground state electron configuration is lowest energy level and have most stable arrangement.

3) An excited state configuration is a higher energy level.

4) According to Aufbau principle ., electrons will occupy the orbitals of lower energies first then occupying higher energy orbitals.

5) Energy of orbitals is calculated by the sum of principle quantum number and azimuthal quantum numbers.

6) The rule of electron filling in the orbital is from lower energy level to higher energy level.

7) According to this rule electrons are filled in the order of 1s 2s 2p 3s 3p 4s 3d 4p 5s ........and so on.

8) According to pauli principle , maximum two electrons, having opposite spin can fit in orbital.

9) According to Hund's rule , orbital in given sub-shell is singly occupied by electrons before filling second electron in an orbital.

10) The ground state configuration is the arrangement of electron around the nucleus of an atom with lower energy levels.

Hence,The reasonable ground-state electron configuration is 1s² 2s² 2p⁶

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The periodic table has changed very little since it was originally developed by Mendeleev and Meyer is referred to as a false statement.

This is defined as the arrangement of elements based on their atomic number in a tabular form. It consists of 18 vertical columns which re referred to as groups and seven horizontal rows called period.

Henry Moseley in 1913 organized Mendeleev's periodic table based on physical properties.This took into consideration their atomic number rather than atomic mass and other missing elements.

This is the periodic table which is used currently and therefore hasn't changed much which is why false was chosen.

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Answer: c = 2.99792458 x 108m/s

Explanation: This equation is the speed of light in a medium having an index n, and c represents the speed of light in vacuum.

A – This is the crest, the higher point of the wave

B – This is the amplitude of the wave. It is the point of maximum displacement

C – This is the trough of the wave

D – This is the wavelength of the wave.

A wave is a disturbance, along a medium that transfers energy. We know that a wave is a progressive wave if it moves from one point to another. There are several ways by which we could classify waves.

Waves could be classified as mechanical waves or as electromagnetic waves or as stationary waves and travelling waves or even as transverse waves and longitudinal waves.

In any case, the wave that we have in this image is a travelling wave and we need to obtain the parts of the wave as has been shown in the image that is attached here.

Let us identify the parts of the wave as shown;

A – This is the crest, the higher point of the wave

B – This is the amplitude of the wave. It is the point of maximum displacement

C – This is the trough of the wave

D – This is the wavelength of the wave.

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20 standard amino acids are available. Based on the structure and properties of the side chains, these amino acids can be divided into seven classes.

1. Alkyl groups

2. Sulfur-containing

3. Alcohols

4. Acids

5. Bases

6. Aromatics

7. Amides

a) Basic (contains a guanidinium group as the side chain)

b. Neutral (contains an alkyl side group)

c. Acidic (contains a carboxylic acid side chain)

d. Polar (contains an amide side chain)

e. Polar (contains a phenol side chain)

f. Non-polar (contains a benzene side chain)

g. Neutral (contains H as the side chain)

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The Complete question is mentioned below:

Classify the following amino acids as nonpolar, polar but neutral, acidic, or basic.

(a) Arginine

(b) Leucine

(c) Glutamic acid

(d) Asparagine

(e) Tyrosine

(f) Phenylalanine

(g) Glycine

The Lewis dot structure are given as: dot represents total no. of valence electron around an atomic symbol.

Calcium                    Calcium ion

   Ca :                              Ca[tex]^{2+}[/tex]

Sodium                     Sodium ion

   Na ·                              Na[tex]^{+}[/tex]

Aluminium                 Aluminium ion

   ·Al :                               Al[tex]^{3+}[/tex]

Barium                        Barium ion

  Ba :                                Ba[tex]^{+}[/tex]

Magnesium                Magnesium ion

   Mg :                                Mg[tex]^{2+}[/tex]

Cesium                       cesium ion

   Cs ·                                Cs[tex]^{+}[/tex]

Lithium                      Lithium ion

    Li ·                            Li[tex]^{+}[/tex]

Thus, In Lewis dot structure , one dot for every valence  electron with element's symbol.it describe the bonding atoms, no, of bonds in molecules and the lone pairs left in bonding. A single dot represents one electron.Lewis  symbols shows no. of valence electron of a specific elements.

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For one thing, carbon atoms are remarkable in the chemical world because they can combine to form extraordinarily long, strong chains with branches or rings of varying widths. The correct option is D.

The most distinctive feature of a carbon atom is its ability to self-combinate or catenate. This characteristic is very important since it produces a lot of organic or carbon-based chemicals. Numerous atoms can be joined to the lengthy carbon chain in various ways to create a vast array of carbon compounds.

Since carbon possesses four valence electrons, it can make four covalent bonds to reach its full outer energy level. It creates molecules known as hydrocarbons when it solely forms bonds with hydrogen.

Thus the correct option is D.

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The atom that contains only one electron in the highest occupied energy sublevel is (c) Ga

A sublevel is the division of the principle energy levels. There are infinite numbers of sublevels but the defined are: s, p, d and f.

These energy levels are used to predict and explain the chemical bonds which atoms can form. The equation that allows for finding the distributions for an electron is the Schrodinger's equation.

For the options gave we have the following sublevels:

(a) S = [Ne] 3s2 3p4

(b) Ca = [Ar] 4s2

(c) Ga = [Ar] 3d10 4s2 4p1

(d) Sb =[Kr] 4d10 5s2 5p3

(e) Br = [Ar] 4s2 3d10 4p5

As we can see the only atom that has one electron in the highest occupied energy sublevel is Gallium

The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.

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Answer:

3.141592653589793238

Explanation:

3.141592653589793238

The molar mass of the unknown compound in the aqueous solution was 223.2 g/mol.

Osmotic pressure can be described as the minimum pressure requires to be applied to a solution to stop the flow of its pure solvent across a semipermeable membrane. The measurement of the tendency of a solution to take in a pure solvent by osmosis is osmotic pressure.

To determine the molar mass of a compound from the given weight, the concentration of the compound needs to be determined.

π = i ×MRT

8.44 = 1×M× 62.36 ×298

M = 4.54 × 10⁻⁴ M

Given the mass of the unknown compound = 15.2 mg = 0.0152 g

The volume of the compound = 150 ml =0.150 L

From the molarity of the compound, we can determine the molar mass as:

Molarity = mass/(Molar mass × Volume)

Molar mass =  mass/(Molarity × Volume)

Molar mass = 0.0152/ (4.54 × 10⁻⁴ × 0.150)

Molar mass = 223.2 g/mol

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Wavelength of (nm) of photon emitted is 438nm

Wavelength is the distance between identical points means adjacent crest in the adjacent cycles of a waveform signal propagated in space or along a wire

Here in the given data is photon emitted when electron drop at 7th orbital means n = 7 and n = 1 for hydrogen atom and redberg constant is also given = 1.097×10⁷m⁻¹

we have to find wavelength = ?

Expression of wavelength of radiation is

1/λ = R (1/n₁² - 1/n₂²)

1/λ = 109677×(1/7²- 1/1²)

1/λ =  109677×48/49

λ = 438.69cm = 43869m

λ = 438nm

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According to the research, the correct option is a bar graph. It is the best way to show the lead levels in six contaminated water wells.

It is a graph that is used to show the changes that the data have undergone by graphing the data in bars, representing the frequencies by means of columns (or bars), through their height in a Cartesian plane.

It is a way of summarizing a set of data by categories, allowing different values to be compared using bars of different sizes.

Therefore, we can conclude that according to the research, the correct option is a bar graph. It is the best way to show the lead levels in six contaminated water wells.

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Answer:

poh = .253

p h2o= p[H+] +P[OH-]

ph2o is 14

14= pH+ + poH

14 = pH+ +.253

14-.253 =pH+

13.747 =ph+

and we know that

log [H+] = -pH+

[H+] = antilog pH+

H+ = antilog 13.747

H+ = 1.79×10-15

Only 2.5 moles of CO2 can be produced since oxygen is the limiting reaction.

4molCH4 x (1molCO2/1molCH4) =4 mol CO2

5 mol O2 x (1molCO2/2molO2) =2.5 molCO2

Only 2.5 moles of CO2 can be produced since oxygen is the limiting reaction.

Co2 is used as a refrigerant, in extinguishers, to blow coal, foam rubber and plastics, inflate life rafts and life jackets, blast coal, promote plant growth in greenhouses, immobilise animals before slaughter, and in carbonated drinks.

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If the air pressure is reduced, the pointer or hand of the Torricelli's mercury barometer sinks or falls to the bottom.

An inverted (upside-down) glass tube standing in a mercury bath is a Torricellian barometer, also known as a mercury barometer. Some of the mercury's surface particles climb up the tube as a result of air pressure pushing down on it. The mercury rises more rapidly when air pressure increases.

A tall closed tube placed upside-down in a mercury bath, which is a thick liquid metal at room temperature, creates the simplest type of barometer, with the liquid rising partially up the tube as it does in a thermometer. Because mercury is more practical than water for barometers, we utilize it instead. Due to its lower density than mercury, water will be lifted by air pressure significantly higher up a tube than the same volume of mercury.

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The number of electrons present in the outermost shell is called valence electrons.

The number of electrons present in the last shell is called valence electrons. The atomic number of sodium is 11 and the atomic number of oxygen is 8.

There is 1 valence electron in sodium. The number of valence electrons in oxygen is 2.

The atomic number of iodine is 53. The number of the valence electron in iodine is 1. The atomic number of calcium is 20. The valence electron in calcium is 2.

Therefore, The number of electrons present in the outermost shell is called valence electrons.

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Coordination numbers are defined for the crystalline structures that tell about the numbers of atoms bonded to the central atom. The coordination number of a diamond is 4.

A coordination number has been defining the number of the ions, atoms, and molecules that are bonded to the central atom of the crystalline compound or a complex.

The diamond has 8 carbon atoms in its one unit and its coordination number is 4 as its lattice type is face-centered cubic that has carbons at the corners and face center of the structure. One carbon contributes 1/8 hence and the faces center contributes 1/2.

Therefore, the diamond has a coordination number of 4.

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Protecting Groups for Amines:

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The value that would be put in the numerator of this calibration would be 10° C .

The process of calibrating an instrument involves setting it up such that it can produce results for samples that are within a reasonable range. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.

In order to ascertain the mistake or confirm the precision of the unknown value of the DUT, a calibration is normally carried out. As a simple illustration, you may calibrate a DUT thermometer by measuring its temperature in water at its known boiling point (212 degrees Fahrenheit) in order to determine the thermometer's inaccuracy.

To obtain accurate readings, a thermometer must be calibrated because its precision is susceptible to deterioration over time. Thermometers can change over time for a variety of reasons.

Hence, The value that would be put in the numerator would be 10° C because difference between two marked values or space between two marked value is 10.

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The mass of dinitrogen tetroxide the number of Nitrogen atoms are 46 x 10^9 gram

Given:

number of nitrogen atoms = 1 x 10^12 atoms

To Find:

mass of dinitrogen tetroxide

Solution:

From the molecular formula of dinitrogen tetraoxide;

molar mass of dinitrogen tetraoxide = 92 g/mol

92 g of dinitrogen tetraoxide contains 2 atoms of nitrogen

x g of dinitrogen tetraoxide will contain 1 * 10^12 atoms of nitrogen

x = 92*1* 10^ 9/2

x = 46 x 10^9 gram

Hence, the number of Nitrogen atoms are

Hence, the number of Nitrogen atoms are 46 x 10^9 gram

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Answer:

The mass of dinitrogen tetroxide the quantity of Nitrogen particles are 46 x 10^9 gram

Number of nitrogen atoms = 1 x 10^12 atoms

Explanation:

From the atomic Formula of dinitrogen tetraoxide;

molar mass of dinitrogen tetraoxide = 92 g/mol

92 g of dinitrogen tetraoxide contains 2 molecules of nitrogen

x g of dinitrogen tetraoxide will contain 1 * 10^12 molecules of nitrogen

x = 92*1* 10^ 9/2

x = 46 x 10^9 gram

the quantity of Nitrogen molecules are 46 x 10^9 gram

The individual mass of C, H and O in given sample are 0.5196 g, 0.0374 g and 0.1979 g respectively.

Moles of CO2 formed can be calculated as

= Mass of CO2 / Molar mass of CO2

= 1.9061 / 44 = 0.0433 moles

Now, moles of C which is present in one mole of CO2 = 1 mole

Moles of C in 0.0433 moles of CO2 = 0.0433 moles

As we know that, molar mass of C = 12 g / mol

Mass of C in 0.7549 g of given sample can be calculated as

= 0.0433 × 12 =0.5196 g

Mass of H2O formed = 0.3370 g

Similarly, Molar Mass of H2O = 18 g / mol

Moles of H2O = 0.3370 / 18 = 0.0187 moles

Moles of H present in 1 mole of H2O = 2 moles

Moles of H present in 0.0187 mole of H2O = 2 × 0.0187 = 0.0374 moles

Molar mass of H = 1 g / mol

Mass of H contained in 0.7549 g of sample = 1 × 0.0374= 0.0374 g

Mass of O in 0.7549 g sample can be calculated as

= 0.7549 – [(Mass of C ) + (Mass of H) ]

= 0.7549 – [ (0.5196) + (0.0374) ]

= 0.1979 g

Thus, we calculated that the individual mass of C, H and O in given sample are 0.5196 g, 0.0374 g and 0.1979 g respectively.

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DISCLAIMER: THE above question is incomplete. Complete question is given below:

A 0.7549g sample of the compound burns in o2(g) to produce 1.9061g of co2(g) and 0.3370g of h2o(g). Calculate the individual mass of C, H and O in the given sample.

Answer:

protons 16 elecrons 16

Explanation:

this is because we say that the number of protons is equal to the number of elecrons in a give Element.

Answer:

A strong acid or a strong base should be neutralized before pouring down a drain.

Explanation:

Always make sure to add acid to water (not vice-versa) to avoid a nasty exothermic reaction :)

Answer:

b

Explanation:

well acids are acidic and bases are basic so they nutralize it

Option (b) They can neutralize acids, which is true about bases.

A substance that neutralizes acid is a base and this is soluble in water and is an alkali. however, all bases are not soluble in water. for that reason, All alkali are based totally however all bases are not alkali.

Bases are known as Arrhenius bases, Brønsted bases, and Lewis bases. All definitions agree that bases are substances that react with acids as firstly proposed by G.-F. Rouelle in the mid-18th century.

Neutralize acids, a susceptible base is used. Bases have a sour or astringent taste and a pH of more than 7. common bases are sodium hydroxide, potassium hydroxide, and ammonium hydroxide. Bases are neutralized by means of the usage of a weak acid.

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1375.5 kg ice (in kg) there is in Greenland if the island  

Given data is 85% of Greenland is covered in ice  thickness = 1500 meters 840000 square miles,  density = 0.917 g/mL, one mile = 1.60 kilometers.

Here  1.60 kilometers = 0.6177 square miles we have to find ice (in kg) = ?

Here density is given and thickness also given means volume so we have to find mass in kg = ?

Density = mass/volume

0.917 g/mL = mass/ 1500

Mass = 0.917 g/mL× 1500

Mass = 1375.5 kg of  ice there is in Greenland if the island

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Temperature is 273 Kelvin and pressure is 1 bar.

Given - 10 mol of gas at STP

Temperature = ?

Pressure = ?

STP -  STP or Standard Temperature and Pressure, refers to the nominal atmospheric conditions at sea level. 0 degrees Celsius and 1 atmosphere are the respective temperatures and pressures. The STP value is essential for physicists, chemists, engineers, pilots, and navigators in addition to other specialists.

In order to report on the qualities of matter, standard conditions for temperature (T) and pressure (P) relate to a certain temperature and pressure. STP values are frequently applied in gas experiments.

STP was previously defined as follows by the International Union of Pure and Applied Chemistry (IUPAC):

It is 0 degrees Celsius outside (273.15 degrees Kelvin or 32 degrees Fahrenheit)

One atmosphere (101.325 kilopascal or 760 Torr)

This usage of the term has been dropped. However, the definition of the volume (V) term normal cubic meter continues to be often employed under these circumstances. The IUPAC has used a stricter definition of STP since 1982:

Absolute pressure: 105 Pa or 100,000 pascals (1 bar, 14.5 pounds per square inch, 0.98692 atm).

Hence, Temperature is 273 Kelvin and pressure is 1 bar at STP.

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