Do all variations help organisms survive

The most charged oxygen atom that exists in the molecule of water (H2O) is covalently joined to hydrogen. As a result, the hydrogen nucleus on one water molecule interacts with that of oxygen on another water molecule via a dipole.

Hydrogen ties form between nearby oxygen and hydrogen atoms liquid adjacent water molecules in this instance of water. A bond called a hydrogen bond, it is generated via an attraction among two water molecule molecules.

Water exhibits H-bonding because it includes oxygen. Because hydrogen bonds are not present in the acid hydrochloric, it lacks oxygen, nitrogen, and fluorine. Therefore, option (d) — hydrochloric acid — is the correct response.

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Sodium is a metal that belongs to group 1 of the periodic table.

My favorite element is sodium. Sodium is found in group one of the periodic table. The element is univalent and also forms univalent positive ions. Like every other metal, sodium is able to react with dilute acids to liberate hydrogen gas.

Sodium is a light metal and is known to react with mercury to form the sodium mercury amalgam which is obtained during the electrolysis of sodium chloride. All of the compounds that are formed by sodium are ionic in nature. However the hydrides of sodium are unstable.

Sodium is highly reactive thus it must not be exposed to air since it could ignite spontaneously in air. As such, sodium must be stored under paraffin oil. All the compounds of sodium are ionic in nature.

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Answer:

\(x_B=0.0769\)

\(m=0.990m\)

Explanation:

Hello,

In this case, we can compute the mole fraction of benzene by using the following formula:

\(x_B=\frac{n_B}{n_B+n_C}\)

Whereas n accounts for the moles of each substance, thus, we compute them by using molar mass of benzene and cyclohexane:

\(n_B=6.24g*\frac{1mol}{78.11g}=0.0799mol\\ \\n_C=80.74g*\frac{1mol}{84.16g} =0.959mol\)

Thus, we compute the mole fraction:

\(x_B=\frac{0.0799mol}{0.0799mol+0.959mol}\\ \\x_B=0.0769\)

Next, for the molality, we define it as:

\(m=\frac{n_B}{m_C}\)

Whereas we also use the moles of benzene but rather than the moles of cyclohexane, its mass in kilograms (0.08074 kg), thus, we obtain:

\(m=\frac{0.0799mol}{0.08074kg}=0.990mol/kg\)

Or just 0.990 m in molal units (mol/kg).

Best regards.

Considering the definition of mole fraction and molality:

You know that:

The molar fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution.

Being the molar mass and the mass in the solution of each compound, the number of moles of each compound can be calculated as:

So, the total moles of the solution can be calculated as:

Total moles = 0.08 moles + 0.96 moles = 1.04 moles

Finally, the mole fraction of benzene can be calculated as follow:

\(\frac{number moles of benzene}{total moles} =\frac{0.08 moles}{1.04 moles} = 0.077\)

Finally, the mole fraction of benzene is 0.077.

Molality is the ratio of the number of moles of any dissolved solute to kilograms of solvent.

The Molality of a solution is determined by the expression:

\(Molality=\frac{number of moles of solute}{kilograms of solvent}\)

In this case, you know:

Replacing:

\(Molality benzene=\frac{0.08 moles}{0.08074 kg}\)

Molality benzene= 0.9908 \(\frac{moles}{kg}\)

Finally, the molality of benzene is 0.9908 \(\frac{moles}{kg}\).

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Answer:

D. Compressibility​

Explanation:

Answer:

120N

Explanation:

Answer:

3

Explanation:

Load / Effort

The effort is 30N and the Load is 90N.

So the MA is equal to 90/30 = 3

The volume of hydrogen gas produced in the reaction of 73 grams of zinc and 73 grams of hydrochloric acid (under normal conditions) is approximately 22.4 liters.

To calculate the volume of hydrogen gas produced in the reaction of zinc and hydrochloric acid, we need to use the principles of stoichiometry and the ideal gas law.

First, let's write the balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl):

Zn + 2HCl →\(ZnCl_2\)+ H2

From the equation, we can see that one mole of zinc reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas. To determine the number of moles of zinc and hydrochloric acid, we need to convert the given masses into moles.

The molar mass of zinc (Zn) is approximately 65.38 g/mol, so 73 grams of zinc is equal to:

73 g Zn * (1 mol Zn / 65.38 g Zn) ≈ 1.116 mol Zn

Similarly, the molar mass of hydrochloric acid (HCl) is approximately 36.46 g/mol, so 73 grams of HCl is equal to:

73 g HCl * (1 mol HCl / 36.46 g HCl) ≈ 2.002 mol HCl

According to the balanced equation, the reaction produces one mole of hydrogen gas for every two moles of hydrochloric acid. Therefore, since we have 2.002 moles of HCl, we expect to produce half that amount, or approximately 1.001 moles of hydrogen gas.

To calculate the volume of hydrogen gas, we can use the ideal gas law, which states:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. In this case, we assume the reaction is conducted under normal conditions, which means a pressure of 1 atmosphere and a temperature of 273.15 Kelvin.

Rearranging the equation to solve for V, we have:

V = nRT / P

Substituting the values, we get:

V = (1.001 mol) * (0.0821 L·atm/(mol·K)) * (273.15 K) / (1 atm) ≈ 22.4 L

Therefore, the volume of hydrogen gas produced in the reaction is approximately 22.4 liters.

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Answer: 1.695x10^24 atoms

Explanation: 0.938 moles CO2 = 0.938xavogadro number molecules CO2, so number of atoms = 3x0.938x6.02214076x10^23 = 1.695x10^24

Answer:

This creates destructive interference.

Explanation:

When the two ends meet they will cancel each other out.

Both students are shaking the rope in the upward direction. Hence their crest will meet up and form the constructive  interference pattern. The intensity of the increases.

When two waves moves in phase, their crest or troughs add up and the amplitude of the wave increases. This phenomenon is called constructive interference.

If the two waves are passing out of phase to each other then they undergo destructive interference. The amplitude of the destructive interference pattern reduces from their initial values.

Here, both students are shaking the rope in the upward direction. Thus, they are in moving in phase. Hence their crest will meet up and form the constructive  interference pattern. The intensity of the increases.

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Answer:

3 AU

Explanation:

The distance from the Earth to the Sun is known as 1 AU, or 1 Astronomical Unit. If an asteroid is three times this distance, it is 3 AU away.

Answer:

4.06 g of Mg(OH)2

Explanation:

The equation of the reaction is;

2NaOH(aq) + MgCl2(aq) -------> Mg(OH)2(s) + 2NaCl(aq)

Number of moles of NaOH= 57/1000 * 3.40 = 0.19 moles

Number of moles of MgCl2 = 38/1000 * 1.9 = 0.07 moles

We must find the limiting reactant. This is the reactant that yields the least amount of the solid.

From the reaction equation;

2 moles of NaOH yields 1 mole of Mg(OH)2

0.19 moles of NaOH yields 0.19 * 1/2 = 0.095 moles of Mg(OH)2

Also;

1 mole of MgCl2 yields 1 mole of Mg(OH)2

0.07 moles of MgCl2 also yields 0.07 moles of Mg(OH)2

Hence MgCl2 is the limiting reactant and 0.07 moles of Mg(OH)2 is produced.

Mass of Mg(OH)2 produced = number of mole * molar mass

molar mass of Mg(OH)2 = 58 g/mol

Mass of Mg(OH)2 produced = 0.07mol * 58 g/mol = 4.06 g of Mg(OH)2

Answer:

Statement 2 (The molecule is made up of chromosomes)

Explanation:

This question is describing DNA, as the biological molecule. DNA is a type of nucleic acid that functions in the storage of genetic information in the cell. This means that contained in the DNA, are segments that code for proteins called GENES. It is contained in the nucleus of eukaryotic cells where it is wrapped around structures called CHROMOSOMES.

BASED on the four statements given by the student, which happens to be characteristics of this molecule, the statement 2, which states that the molecule is made up of chromosomes needs to be revised to make it true. This is because DNA is not made up of chromosomes but rather DNA is contained in chromosomes.

There are 0.9797 moles of chlorine atoms are there in 5.9 × 1023 molecules of carbon tetrachloride, CCl4

Number of Atoms or Molecules = (Number of Moles) * (6.022*10²³)

Given:

Molecules of chlorine atom = 5.9 * 10²³

Avagadro constant = 6.022*10²³

Number of moles = Number of molecules/ Avagadro constant

= 5.9 * 10²³ / 6.022*10²³

= 0.9797

Hence, there are 0.9797 moles of chlorine atoms are there in 5.9 × 1023 molecules of carbon tetrachloride, CCl4.

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Answer:

Clouds

Explanation:

The cloud among the given options would be visible only when the light from a different source reflects outside it. This is due to the reason as we are able to see the clouds only when the sun reflects it's light on it and we can witness it by not seeing the clouds in the sky on a shady day. Thus, option D is the correct answer. Sun cannot be the one as the sun itself can produce its own light and thus, a source of light. The lightning is characterized as a 'flash of light' and the flashlight also produces light.

Answer: b) calcium sulfide

Explanation:

The following math operation and report your answer to the

correct number of significant digits is. 4.013×10^-2

now we have given 10.000-9.768/5.78,

we have to find correct significant digits

10.000-9.768 ÷5.78

=0.232÷5.78

=0.04013, it has 4 significant figure

we have to write in significant digit

so 0.04013 = 4.013×10^-2

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Answer: Coefficient 0

subscript for V 2

subscript for O 5

Explanation: yes

There is no coefficient in V₂O₅ and the subscript of vanadium V is 2 and the subscript of oxygen is 5.

Vanadium pentoxide is an ionic compound formed by donating electrons from the vanadium metal to oxygen.  The chemical formula of vanadium pentoxide is V₂O₅.

The chemical formula of a compound is written in terms of the chemical symbol of each constituent elements and the number of their atoms. The number of atoms is written as subscript for the chemical symbols.

In V₂O₅, there are are 2 vanadium atoms and 5 oxygen atoms. Coefficients are numbers prior to the formula in reaction. Here there is no coefficient and the subscript for V is 2 and that of O is 5.

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Answer:

133.34 g/moles

Explanation:

but to make life easy it could be 133.4 g/ moles as well

Assuming a similar number of molecules, the matter that occupies the most space is gas. Option C is correct.

This is because gases have no definite shape or volume, and their molecules are spread out, moving freely in all directions. As a result, gases tend to occupy the entire volume of their container and expand to fill the available space. This is known as the "kinetic molecular theory" of gases.

In contrast, solids and liquids have a definite volume and shape. Solids have a fixed shape and their molecules are packed closely together, while liquids have a variable shape and their molecules are less closely packed. As a result, both solids and liquids occupy less space than gases.

It is worth noting that the volume of a solid or liquid can change under certain conditions, such as changes in temperature or pressure. However, even under these conditions, the space occupied by a solid or liquid is still less than that occupied by a gas. Option C is correct.

The complete question is

Which of the following matters occupies more space, assuming similar number of molecules?

A. Solid

B. Liquid

C. Gas

D. Solid and gas

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Copper atoms (Cu) were created by reducing copper ions (Cu2+). An illustration of a reduction reaction is this. (Mg2+).To create Mg2+ ions, Mg atoms lost their electrons. An example of an oxidation reaction is this.

Oxidation and reduction occurred in test tube 5. Here is the equation for the reaction that took place:MgSO4 (aq) + Cu (s) CuSO4 (aq) + MgCuSO4's blue hue was neutralised to a solid copper hue. Copper atoms (Cu) were created by reducing copper ions (Cu2+). An illustration of a reduction reaction is this. Cu atoms are created when Cu2+ gains electrons. Due to the presence of magnesium ions (Mg2+), the solution was greenish-yellow.To create Mg2+ ions, Mg atoms lost their electrons. An example of an oxidation reaction is this. Two electrons were lost by the magnesium atom, leaving two electrons behind.

As a result, test tube 5 experienced both oxidation and reduction.It is possible to prove that oxidation, reduction, or both took place through the reaction's electron transfer and colour changes. A reduction reaction was seen when copper ions transformed into copper atoms. An oxidation reaction was evident when magnesium atoms transformed into magnesium ions.

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By using the ideal gas law and Avogadro's number, we find that there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.

To determine the number of molecules of CO2 in 2.5 L at STP (Standard Temperature and Pressure), we can use the ideal gas law and Avogadro's number.

Avogadro's number (N_A) is a fundamental constant representing the number of particles (atoms, molecules, ions) in one mole of substance. Its value is approximately 6.022 × 10^23 particles/mol.

STP conditions are defined as a temperature of 273.15 K (0 °C) and a pressure of 1 atmosphere (1 atm).

First, we need to convert the volume from liters to moles of CO2. To do this, we use the ideal gas law equation:

PV = nRT,

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Since we have STP conditions, we can substitute the values:

(1 atm) × (2.5 L) = n × (0.0821 L·atm/(mol·K)) × (273.15 K).

Simplifying the equation:

2.5 = n × 22.4149.

Solving for n (the number of moles):

n = 2.5 / 22.4149 ≈ 0.1116 moles.

Next, we can calculate the number of molecules using Avogadro's number:

Number of molecules = n × N_A.

Number of molecules = 0.1116 moles × (6.022 × 10^23 particles/mol).

Number of molecules ≈ 6.72 × 10^22 molecules.

Therefore, there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.

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Answer:

87 is the wight of the hight

Explanation:

Answer:

The correct answer is "Burning fuel inside of an engine." This is an example of a chemical reaction because it involves the rearrangement of atoms to create new substances. In this case, the fuel is reacting with oxygen in the air to produce heat, light, and various gaseous byproducts such as carbon dioxide and water vapor. By contrast, the other options are examples of physical changes, which involve changes in the state or appearance of a substance without changing its chemical composition.

Answer: Burning fuel inside of an engine

Explanation: Got it correct on the forms

(Edit: G o o g l e F o r m s)

The total number of moles of electrons lost by Mg(s) when 2.0 moles of electrons are gained by Ni2+(ag) is also 2.0 moles of electrons.

This is because in a chemical equation, the number of moles of electrons gained by the reducing agent (in this case Ni2+) is equal to the number of moles of electrons lost by the oxidizing agent (in this case Mg(s)).

In this redox reaction, Mg is being oxidized because it loses electrons and Ni is being reduced because it gains electrons. The oxidation and reduction process are occurring simultaneously, so the number of electrons lost by Mg(s) is equal to the number of electrons gained by Ni2+(ag).

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The electrons that are gained by the \(Ni^{2+}\) ion is 2.0 moles of electrons.

We know that when there is a redox reaction, there would be the loss or gain of electrons in the process. The process is a simultaneous one so the electrons that are lost by one specie must as a matter of necessity be gained by another specie.

In this case, as we look at the reaction equation we can see that there are two electrons that have been lost by the magnesium atom and these two electrons would be gained by the Nickel II ion.

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Explanation:

basically first you have to understand these definitions

*mass number ( e.g. where it says oxygen 16 or 17 - it's basically that number at the top)

mass number is the 'number of protons + number of neutrons'

now this will help you do the first question

if you do 16 -8 = 8 ( that's how she got 8 neutrons)

another thing you need to know is that all the time the number of protons = the number of electrons ( they are the same)

this will help you answer table 2

for fluorine it says there are 9 electrons, you automatically have to think 9 electrons means 9 protons too, ( I think she has got that wrong, it's supposed to be 9 protons not 19)

if you have 9 protons and the given 10 neutrons and add them together you will get the mass number which is supposed to be 19

then if you try out the same rules for argon you will see they work - the number of electrons and protons are same and when you find out the protons, you can just take that away from the mass number ( which is number of protons + neutrons) to get just the number of neutrons.

Hope this helps you :)

Answer:

KOH is a strong base, and therefore dissociates completely into negative  and positive ions in water solution. pH 8.35 is a high pH (> 7), therefore this is a basic solution. 4.

Explanation:

Explanation:

The number of moles of a substance is represented by the following formula:

n=NNA

where, n

is the number of moles of the substance, N

is the total number of molecules present in a substance, andNA

is the Avogadro constant.

The given compound is N2O5

So one mole of N2O5

contains 6.023×1023

numbers of molecules. Thus the 0.400

moles of N2O5

contains a number of molecules => 0.400moles×6.023×10^23

.

=> 2.41×10^23 molecules.

there are 2.41 thats the anwser

Answer: 460.458KJ/mol

Explanation:

The energy of a photon = hv = hc/ f

given wavelength = 260nm

changing nm to m becomes 260 x 10^-9m

remembering that frequency = speed of light(c)/ f wavelength

= 3 x10 ^8 / 260 x10^-9 = 1.15 x 10^15 s-1

frequency (v) = 1.15 x 10^15 s-1

Energy = hv

where h is planks constant =  6.626 X 10^-34 J⋅s

v is frequency = 1.1538 x 10^15s-1

E=  6.626X 10^-34  J⋅s X  1.15 x 10^15s-1 =7.645X 10^-19 joules

But I  mole = 6.023 X10^23

therefore Energy = 7.645X 10^-19 x 6.023 X 10^23 =460,458.35Joules / mole

460,458.35Joules / mole  To  kilojoules/mol = 460,458.35Joules / mole/1000= 460.458KJ/mol