For which of the following aqueous salts will electrolysis produce hydrogen gas and oxygen gas? Check all that apply:
A) NiF2(aq)NiF2(aq).
B) NaF(aq)NaF(aq).
C) NiI2(aq)NiI2(aq).
D) NaI(aq)NaI(aq).
E) CuBr(aq)CuBr(aq).

220.035 grams of HNO3 are needed to make 700.0 mL of a 5.0 M solution.

To make 700.0 mL of a 5.0 M solution of HNO3, we need to calculate the number of moles of HNO3 required, then convert that to grams. We can use the formula: Molarity = moles of solute / liters of solution.We know that the molarity is 5.0 M and the volume is 700.0 mL.

To convert mL to L, we divide by 1000. So: 5.0 M = moles of HNO3 / (700.0 mL / 1000)Solving for moles of HNO3: moles of HNO3 = (5.0 M) x (700.0 mL / 1000) = 3.5 moles of HNO3. Then we can use the molar mass of HNO3 to convert moles to grams.

HNO3 molar mass is 63.01 g/mol. So, the number of grams of HNO3 required is: 3.5 moles x 63.01 g/mol = 220.035 g. Therefore, 220.035 grams of HNO3 are needed to make 700.0 mL of a 5.0 M solution.

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The concept molarity is an important method which is used to calculate the concentration of a solution. It is mainly employed to calculate the concentration of a binary solution. Here the grams of HNO₃ is 220.53 g.

The term molarity is defined as the number of moles of the solute present per litre of the solution. It is represented by using the letter 'M' and its unit is mol/L. The term molarity is also known as the molar concentration.

Molarity = Number of moles of the solute / Volume of the solution in litres

700.0 mL = 0.7 L

Number of moles  = Molarity × Volume of the solution

5.0 × 0.7 = 3.5

Number of moles = Mass / Molar mass

3.5 = m / 63.01

m = 220.53 g

Thus the mass in grams of HNO₃ is 220.53 g.

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Answer:

I don't understand what you mean

Answer:

Physical Change

Explanation:

Melting of Wax Is a Physical Change but Burning of Wax Is a Chemical Change: Melting of wax, by itself, involves a change of state from solid to liquid.

A solution with an 8% (m/m) concentration was created by dissolving the sodium chloride in 40.0 g in 500.0 g of water. Sodium chloride, also known as table salt.

Sea salt has the chemical formula NaCl, which indicates a 1:1 ratio of sodium chloride ions, and is an ionic material despite also containing other chemical salts. With molar weights of 22.99 and 35.45 g/mol, respectively, 39.34 g of Na and 60.66 g of Cl make up 100 g of NaCl. The concentration can apply to any type of chemical mixture, even though it is most frequently used to describe solutes and solvents in solutions. Two variations of the molar (amount) concentration are the normal concentration and the osmotic concentration.

(40.0/500)*100, which equals 8, is the concentration formula.

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Answer:

Explanation:

a. Double Replacement: CH3COOH(aq) + NaHCO3(aq) --> CH3COONa(aq) + H2O(l) + CO2(g)

b. Decomposition: H2CO3(aq) --> H2O(l) + CO2(g)

c.Overall: CH3COOH(aq) + NaHCO3(aq) --> CH3COONa(aq) + H2O(l) + CO2(g) + CO2(g)

The empirical formula of lysine is C₆H₁₄N₂.

By calculating the smallest whole number ratio from the mass percentages of a compound's constituent parts, it is possible to calculate its empirical formula.

We must first establish how many moles of each element are included in 1.50 g of lysine in order to determine the empirical formula for lysine. The mole ratios of the elements may then be calculated using these values and will match the ratio of the subscripts in the empirical formula.

We may determine how many moles of carbon and hydrogen are contained in 1.50 g of lysine by computing the mass of generated CO₂ and H₂O.

Moles of C = 2.72 g CO₂ x (1 mol CO₂ / 44.01 g CO₂) = 0.062 moles

Moles of H = 1.29 g H₂O x (2 moles H / 18.02 g H₂O) = 0.143 moles

Secondly, by being aware that lysine also generated 0.287 g of N. We can determine how many moles of N there are.

moles of N = 0.287 g N x (1 mole N / 28.02 g N) = 0.0102 moles

By dividing each element by the minimum number of moles, which is 0.0102 moles, we can now determine the ratio of the elements.

C = 0.062 moles / 0.0102 moles = 6

H = 0.12 moles / 0.0102 moles = 14

N = 0.0102 moles / 0.0102 moles = 1

Therefore, the empirical formula of lysine is C₆H₁₄N₂

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The chemical equation which can be formulated as the most accurate model for the reaction of burning gasoline which is 2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(g)

A car is designed in such a way where it utilizes fuel as its source of energy. This fuel actually contains all the chemicals where the engine of the car breaks down via combustion to facilitate the process of its functioning. Kinetic energy can be defined as the process of the form of mechanical energy produced as a result of motion. A moving object which individual etc uses kinetic energy to do so.

The fuel (gasoline) which is being supplied into the car's engine makes the car able to move from their place, therefore, we can say that the chemical energy present in the fuel is being converted to kinetic energy that is observable in the car on motion along with the release of heat by the engine.

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The mass of ammonium nitrate (in g) that has the same number of nitrogen atoms as 2.5 liters of liquid nitrogen (n2) is 72.10g.

Given the volume of liquid nitrogen (V) = 2.5L = 2500ml

The liquefied form of the element nitrogen, known as liquid nitrogen, is created commercially through fractional distillation of liquid air.

The density of liquid nitrogen is (d) = 0.808 g/ml.

Let the mass of ammonium nitrate = m

We know that density = mass/volume

mass = density x volume

The molecular weight of liquid nitrogen = 28.0134g

m = (0.808 x 2500) x 1 mole N2/28.0134 = 72.10g

Hence the required mass of ammonium nitrate is 72.10g

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When Iron metal reacts with aqueous silver nitrate to produce aqueous iron(iii) nitrate and silver metal this will be represented as Single replacement reaction. In this the molecules of the chemical get replaced by other molecule.

This can be properly defined as, when One element in a molecule is replaced by another in a chemical reaction known as a single-displacement reaction, sometimes referred to as a single replacement reaction or exchange reaction.

It may be generalized as follows:

A + BC ⟶ AC + B.

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The total number of millimoles present in the solution containing 161 mg of Na ions are 7.04 millimoles/L.

A substance's concentration in a quantity equivalent to a thousandth of a mole (a measure of the amount of a substance). as well known as millimole.

You would need to multiply the number of moles of sodium ions (Na+) in the solution by the number of litres of solution in order to get the number of millimoles represented in the solution.

Divide the given milligrames (mg) by the molar mass of sodium ion to convert mg to moles (22.99).

Therefore, 161 mg/L is 161/22.99 = 7.04 10⁻³ moles/L.

You would now need to multiply 7.04 10⁻³ moles/L by 1000 to convert from moles/L to millimoles/L.

Thus, 7.04 10⁻³ moles/L multiplied by 1000 equals 7.04 millimoles/L.

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The volume of a sodium atom in cubic meters is 6.434×10[tex]^-6[/tex] cubic meters.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

As the atom is sphere , volume is (r)³=(186)³=6.434×10[tex]^-6[/tex] cubic meters.

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The solubility product constant (Ksp) is a measure of the equilibrium of a salt in an aqueous solution.

Solubility is the ability of a substance to dissolve in a given solvent. It is a measure of the maximum amount of a solute that can be dissolved in a solvent.

It is used to determine the solubility of an ionic solid in a given solution. Ksp is the product of the concentrations of the ions in the solution at the equilibrium state.
Table 16.1 lists Ksp values for several ionic solids. The solubility of a salt is the amount of the salt that can be dissolved in a given amount of water or other solvent. To calculate the solubility of a salt, one must first determine the Ksp value for that salt. Then, the amount of the salt that will dissolve in a given amount of solvent can be calculated from the Ksp value.
To calculate the Ksp value for a salt given the solubility, one must first calculate the concentrations of the ions in the solution. This can be done by dividing the solubility of the salt by the total volume of the solution. Once the concentrations of the ions in the solution are known, the Ksp value can be determined by taking the product of these concentrations.

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Answer:

Glasses or contact lenses correct vision because they allow the eye to focus light in the right spot on the retina the spot that produces the clearest image. Because everyone's eyes are different, a pair of glasses that makes one person see wonderfully may look terribly blurry to someone else.

Nearsighted- unable to see things clearly unless they are relatively close to the eyes, owing to the focusing of rays of light by the eye at a point in front of the retina; myopic.

Farsighted- a common vision condition in which you can see distant objects clearly, but objects nearby may be blurry. The degree of your farsightedness influences your focusing ability.

Explanation:

I hope that makes sense

The majority of a hydrocarbon mixture which makes up natural gas is composed of the two saturate light paraffins methane and ethane, which are gaseous in an atmosphere.

During a reversible chemical process, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. As "balancing" is the definition of the word "equilibrium," it follows that what a chemical process represents an equilibrium between the products and reactants involved in the reaction. a situation in which opposing forces are acting in balance or at rest. equitable distribution of all forces, effects, etc.; equal impact. emotional or mental equilibrium; equanimity: She lost it under the burden of the circumstances.

Chemical equilibrium is the condition of a system in which the parameters of the system remain constant over time and neither the reactant concentration nor the product concentration changes. The system enters chemical equilibrium when the forward reaction rate and the reverse reaction rate are equal.

The percentages of nitrogen, oxygen, argon, and other gases, respectively, in the Earth's atmosphere are around 78%, 21%, 0.9 percent, and 0.1%. Other gases that make up the remaining 0.1 percent include minute amounts of neon, carbon dioxide, and methane. Substances called gases are those that can exist under one atmosphere of pressure. The 11 gases are oxygen, neon, krypton, radon, xenon, hydrogen, chlorine, and fluorine. These are referred to be pure gases since they are all elements.

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(A) 0.00 g of CH4 remains after the reaction.

To determine how much CH4 remains after the reaction, we need to use the balanced chemical equation and the concept of stoichiometry.

The balanced chemical equation for the reaction is:

CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)

From the balanced equation, we know that 1 molecule of CH4 reacts with 2 molecules of O2.

We are given that 10.0 g of CH4 and 15.0 g of O2 react. We can use this information to determine the number of moles of CH4 and O2 that react.

1 mole of CH4 weighs 16.04 g and 1 mole of O2 weighs 32.00 g.

10.0 g of CH4 is equal to:

10.0 g / 16.04 g/mol = 0.623 mol CH4

15.0 g of O2 is equal to:

15.0 g / 32.00 g/mol = 0.46875 mol O2

Since the reaction is 2:1 ratio of O2: CH4, so 0.46875 mol O2 is enough for 0.234375 mol of CH4

So, no CH4 remains after the reaction.

Therefore, the answer is (A) 0.00 g of CH4 remains after the reaction.

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Although the theoretical yield is 25.0 grams, the actual yield is only 20.0 grams. utilizing the percent yield stoichiometry formula.

Chemical The quantitative analysis of the reactants and products involved in a chemical process is known as stoichiometry. Stoichiometry is a combination of the Greek words "stoikhein," which means element, and "metron," which means measure.

Stoichiometric challenges can be divided into four groups: conversion from mass to mass. Mole conversion from mass. Conversion from moles to mass stages.

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SO2 is a compound made up of sulfur and oxygen atoms, while SiO2 is a compound made up of silicon and oxygen atoms. The difference in their melting points can be attributed to their chemical structures and the types of chemical bonds that hold the atoms together.

In SO2, the sulfur atom is bonded to two oxygen atoms through covalent bonds. Covalent bonds are formed when atoms share electrons, and they tend to be relatively weak. As a result, the bonds in SO2 are not very strong and do not require a lot of energy to break. This means that SO2 has a relatively low melting point of 201 K.

In contrast, SiO2 is a network-solid, and the Si-O bond is covalent in nature and relatively strong. The network structure of SiO2 means that the atoms are tightly bound to one another in a repeating pattern. To melt SiO2, a large amount of energy is needed to break the strong covalent bonds between the atoms. This results in a high melting point of 1,883 K.

In summary, the difference in melting points of SO2 and SiO2 is due to the different types of chemical bonds and structures present in each compound. SO2 is held together by weaker covalent bonds, while SiO2 is held together by stronger covalent bonds in a network structure.

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The difference in melting points between SO2 and SiO2 can be attributed to their different chemical structures and bonding types.

SO2 is composed of sulfur and oxygen atoms, which form a polar covalent bond. This means that the electrons are shared equally between the atoms, but the electrons are attracted more strongly to one atom than the other, creating a partial positive and partial negative charge.

The polar nature of the SO2 molecule creates relatively weak intermolecular forces, such as dipole-dipole interactions, which results in a relatively low melting point.

SiO2, on the other hand, is composed of silicon and oxygen atoms, which form covalent bonds. The covalent bond in SiO2 is much stronger than the polar covalent bond in SO2, as the electrons are shared equally between the atoms and there is no partial positive or negative charge. As a result, the intermolecular forces in SiO2 are much stronger, such as covalent bonds, which results in a much higher melting point.

Additionally, SiO2 is a network solid, meaning that the atoms are held together by a three-dimensional network of covalent bonds. This network structure makes SiO2 much more difficult to melt than SO2, as it requires a large amount of energy to overcome the covalent bonds holding the atoms together. This is another reason why SiO2 has a higher melting point than SO2.

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A Lewis dot structure, also known as an electron dot structure, is a way of representing the valence electrons of an atom in a chemical compound.

It uses dots (also called "electron dots" or "Lewis dots") to represent the valence electrons of an atom. The number of dots around an atom is equivalent to the number of valence electrons in the neutral atom.The Lewis dot structure is written by placing the chemical symbol of the atom at the center and placing dots around it to represent its valence electrons. For example, the Lewis dot structure of carbon (C) would be represented as:C.with four dots around it, representing the four valence electrons of carbon. In a Lewis dot structure, the valence electrons are represented by dots, which are placed around the chemical symbol of the element.

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One mole of Mg contains  6.022 × 10²³ number of Mg atoms. Hence, number  of moles of Mg that contains 2.5 × 10²⁵ atoms is 41.5 moles.

Any substance  that contains   6.022 × 10²³ number of atoms is called ne mole of that substance. This number is called Avogadro number. Hence, one mole of every elements contains Avogadro number of atoms.

Magnesium is 12th element in periodic table. It is an alkaline earth metal. The number of atoms in one mole of Mg is equal to Avogadro number. Mass of the element with one mole of amount is called its atomic mass.

Number of moles of Mg that contains 2.5 × 10²⁵ atoms :

= 2.5 × 10²⁵ atoms/6.022 × 10²³ = 41.5 moles.

Therefore, 41.5 moles of Mg contains 2.5 × 10²⁵ atoms.

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The concept that the electrostatic repulsion between electron pairs surrounding an atom causes these pairs to be separated as far as possible is the foundation of VSEPR theory.

The premise of VSEPR is that valence pairs surrounding atoms tend to repel each other, so we adopt configurations that minimize this repulsion. This reduces the molecule's energy, increases its stability, and determines the shape of the molecule. The main assumptions of VSEPR theory are:

The shape of a molecule depends on the number of electron pairs in the valence shell around the central atom. ii The electron pairs in the valence shell repel each other because the electron cloud is negatively charged. VSEPR theory is used to predict the shape of a molecule from the electron pairs surrounding the central atom of the molecule.

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The phosphorus had a higher affinity for the cells than the sulfur.

Phosphorus is a chemical element that has the symbol P and atomic number 15. It is a nonmetallic, multivalent, and highly reactive element that is an essential component of life. Phosphorus is found in many fertilizers and is an important component of DNA and RNA. In plants, phosphorus helps with energy production, root growth, and seed production. In animals, phosphorus helps with growth and development, muscle contraction and nerve impulse transmission, and cellular communication.

This suggests that the radioactive phosphorus was taken up by the cells and incorporated into their structure, while the radioactive sulfur was not able to be taken up by the cells and remained in the supernatant. Therefore, the phosphorus had a higher affinity for the cells than the sulfur.

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The temperature (T) at which the given reaction has ΔG°=-38.5 kJ, ΔH°=-14.6 kJ, and ΔS°=0.152 kJ/K is 1273.7 K.

Temperature is a physical property of matter that measures the average kinetic energy of the particles in a system. It is measured by thermometers and expressed in units such as degrees Fahrenheit (°F) and degrees Celsius (°C). Temperature is a fundamental factor in determining the nature of the physical and chemical changes that occur in matter.

The temperature (T) that corresponds to the given ΔG°, ΔH°, and ΔS° values can be determined using the equation ΔG° = ΔH° - TΔS°.
Substituting the given values yields:
-38.5 kJ = -14.6 kJ - T(0.152 kJ/K)
Rearranging yields:
T = -38.5 kJ + 14.6 kJ / 0.152 kJ/K = 1273.7 K.
Therefore, the temperature (T) at which the given reaction has ΔG°=-38.5 kJ, ΔH°=-14.6 kJ, and ΔS°=0.152 kJ/K is 1273.7 K.

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Starting and stabilizing the stir function.

Pouring solids into a beaker or other container. To pour liquid, other types of funnels can be utilized. Pouring liquid into a beaker. A powder funnel is a funnel with a broad opening that is used for solids.

Start by beginning and stabilizing the stir function when heating a solution to boiling on a hot plate. To begin, reduce the heat to a medium setting. After approximately ten minutes of not witnessing boiling, increase the heat setting if required. When a certain amount of solute is dissolved in a solvent at constant pressure, the net result of energy absorbed or released as heat by the solution.

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Solid argon is thick than liquid argon because the emulsion wind has a positive pitch, and the solid phase is stable at advanced pressure.

 The critical temperature for a pure substance is the temperature above which the gas cannot come liquid, anyhow of the applied pressure.

For a pure substance, the critical pressure is defined as the pressure above which liquid and gas cannot attend at any temperature. The critical temperature for a pure substance is the temperature above which the gas cannot come liquid, anyhow of the applied pressure.

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The pair of reaction will be solvolysis. Both reaction will occur by SN1 mechanism.        

Solvolysis is a chemical reaction in which the solvent, such as water or the alcohol, is one of the reagents and it is present in great excess of that required for the reaction.

For the two reactions, the organic product is the same. Both the reactions will occur by SN1 mechanism since the substrate is a tertiary alkyl halide and the nucleophile is CH3OH as well as the rate of reaction depends on the concentration of the alkyl halide and the independent of the concentration of methanol present.

Therefore, change the volume of the solvent has no effect on the rate of reaction. The two reactions will proceed exactly the same rate since the initial concentration of the alkyl halide is the same for both the reactions.

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Molar mass of oxygen = 32 g/mo is the ratio of the rate of diffusion of an unknown gas to oxygen is 0.85.

Oxygen is a chemical element with an atomic number of 8 (it has eight protons in its nucleus). Oxygen forms a chemical compound (O2) of two atoms which is a colorless gas at normal temperatures and pressures. Four representations chemists use for molecular oxygen.

We breathe in oxygen and some of this carbon dioxide. When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat.

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The volume of H2S needed to neutralize 45mL of NH2- is 0.053 L

A neutralization reaction, in which an acid and a base react to form water and salt.

The reaction between H2S and NH2- is a neutralization reaction. The balanced equation for the reaction is:

H2S(aq) + NH2-(aq) → NH4HS(aq)

We know that the concentration of H2S is 1.2 M and the concentration of NH2- is 0.80 M and we are trying to find the volume of H2S needed to neutralize 45mL of NH2-.

The number of moles of H2S can be calculated by using the formula:

moles = molarity x volume

The volume of H2S needed to neutralize 45mL of NH2- is equal to the number of moles of NH2- in 45mL, divided by the concentration of H2S.

moles of NH2- = 0.080 L * 0.80 mol/L = 0.064 mol

volume = moles of NH2- / molarity of H2S

volume = 0.064 mol / 1.2 mol/L = 0.053 L

Therefore, the volume of H2S needed to neutralize 45mL of NH2- is 0.053 L.

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An aerosol is a suspension of tiny water droplets in the atmosphere. Due to the removal of N2O5(g) reacting to produce HNO3, reaction 1's equilibrium will change production of additional product (aq).

A suspension of tiny liquid or solid particles in air or even another gas is known as an aerosol. Aerosols can be created naturally or artificially. Fog or mist, dust, lesion from forests, and geothermal steam are a few instances of natural aerosols.

Numerous aerosol sprays contain dangerous substances like formaldehyde and xylene, which are used to protect anatomical objects in jars. In addition to being exceedingly dangerous for adults, kids, and household pets, these toxic substances now include carcinogens and carcinogen.

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Because of their hydrophobic tails & hydrophilic head, phospholipids constitute amphipathic molecules.

A phosphate and a choline molecule (blue) make up the hydrophilic head (orange). This head is joined to a triglyceride (green) that has two fatty acid tails that are hydrophobic (purple). (D) This image reveals the precise atoms that make up each of the phosphatidyl molecule's subdomains.

A individual phospholipid molecule comprises two parallel chains of oleic acids that create the lipid "tails" and a phosphate group, which is referred to as the "head," on the other end. The phosphate group's negative charge group makes the head neutral and hydrodynamic, or "water loving," in nature. As a result, the acid heads are drawn to the water.

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When CH2OH is introduced into the previously evacuated vessel , A physical change takes place because intermolecular attractions are overcome. The correct option to this question is D.

Remove (or evacuate) the air between two glass tubes to form a vacuum and reduce heat loss through conduction and convection.

Methanol is known to contain extremely polar oxygens, so it can exhibit hydrogen bonding. It is known that methanol can form very strong hydrogen bonds. Hydrogen bonds are known to form when the positive charge of hydrogen atoms accumulates significantly.

Hydrogen bonding is a unique type of inter-dipole attraction between molecules rather than covalent bonding to hydrogen atoms. This results from the attraction between a hydrogen atom bonded to an extremely electronegative atom such as an O, N, or F atom and an additional extremely electronegative atom.

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Answer:

sand's specific heat capacity is low that water(i.e. 830J/kg°C) Due to it's low specific heat capacity it gets hotter easily. That's whythe sand on the shores of the lake feels so much hotter than the water in the lake even though the same solar energy is being absorbed by both materials.