The number of moles required to react with 4.70 mol Al is 7.05 mole of Cl₂.
The mole is the quantity of substance of a system that includes as many standard entities as there are atoms in zero.012 kilograms of carbon 12; its image is the mole.
The mole, symbol mol, is the SI unit of the quantity of substance. One mole carries exactly 6.022 140 76 × 1023 essential entities. This wide variety is the fixed numerical cost of the Avogadro regular, NA, whilst expressed in mol−1, and is referred to as the Avogadro variety.
The mole, symbol mol, is the SI unit of the quantity of substance. One mole includes precisely 6.022 a hundred and forty seventy-six x 1023 fundamental entities. This variety is the constant numerical price of the Avogadro consistent, NA, while expressed inside the unit mol–1 and is called the Avogadro number.
Calculation:-
2 Al + 3Cl₂ -----> 2AlCl₃
2 mole required = 3 moles of Cl
therefore 5.70 moles of Al required = 3/2 × 4.70
= 7.05 mole of Cl₂
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Why do elements have unique emission spectra?
Claim:
Evidence:
Reasoning:
each element has a different set of electron energy levels
wed
only some gases can only absorb and emit specific wavelengths of electromagnetic radiation
4. Calculate the number of grams in 1.22 moles of sodium
The mass of 1.22 mol sodium is = 28.06g.
A mole is the SI unit of the quantity of a substance. One mole of a substance contains 6.022 10 to the 23rd power of that substance. Therefore, 1 mole of copper atoms is 6.022 times 10 to the 23rd power of copper atoms. Also, the number of moles of sodium atoms is 6.022 times 10 to the power of 23 sodium atoms.
calculation:-
molar mass of sodium = 24
moles of sodium = 1.22
mass = moles × molar mass
= 1.22 × 24
= 29.28
Mole symbol Mole is a unit of quantity of a substance in the International System of Units. The amount of matter is a measure of how many basic units of a particular matter are contained in an object or sample. Find the atomic weight of each element in the formula, multiply by the number of atoms of that element in the compound and add to all others. This gives the mass in grams of one mole of the molecule.
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how many grams of P4 are needed to produce 4.6 grams of P2O5
The 'a' of 'penta' is deleted when it occurs before 'o' as in 'oxide,' therefore 5.270 grams of P4 are required to generate 4.6 grams of P2O5.
P2O5: what is it in science?Many laboratory professionals are familiar with phosphorus pentoxide as a potent desiccant. It is produced by igniting elemental phosphorus in a dry air current. P2O5 can be found in a variety of crystal and amorphous forms, with crystalline P4O10 being the most prevalent.
Does every farmer require phosphorus?The need for phosphorus is essential to life. It is the P in ATP, the molecule that transports energy throughout cells, and the backbone of DNA. Since phosphorus is necessary for plant growth, farmers have been providing it to their crops for thousands of years.
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Which of the following is a polyatmoic ion?
Answer:
PO4 3-
Explanation:
A polyatomic ion is a group of atoms carrying a charge ( positive or negative ).
A polyatomic ion, also known as a molecular ion, is a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero.
Whereas S2- is not because it is an inorganic ion
In which type of chemical bond are electrons transferred from 1 atom to another?.
Ionic bonds are bonds that occur due to the handover of electrons to form positive ions and negative ions whose electron configuration is the same as that of the noble gasses.
Chemical bondsChemical bonds are the forces that hold atoms in elements and compounds together. Chemical bonds can occur with several types of bonds.
Based on the electron configuration that occurs in bond formation, chemical bonds are divided into 4 types:
1. Ionic or electrovalent bonds
This bond occurs because of the electrostatic attraction between positive ions and negative ions in a chemical compound
2. Covalent bonds
Covalent bonds occur when the sharing of electron pairs from each of the bonding atoms.
3. Coordinate covalent bond
Coordinate covalent bond is a bond that uses a shared pair of electrons, but the electrons only come from one of the atoms.
4. Metallic bond
This bond is formed due to the attractive force of the metal atomic nucleus with a sea of electrons.
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How many asymmetric carbons are present in the compound 2,3,4-tribromohexane
Answer:
There will be 2 asymmetric carbons
Explanation:
2,3,4 trichloropentane 2,4 cetre are chiral but 3
rd
centre is pseudo chiral. It depends on the configuration of 2 & 4 so, the statement is false.
solution
what is the molecular structure of xef4?
Answer:
Square planar
Explanation:
Its 180 degrees so it has to be a square planar.
The structure of the molecule is a square planar geometry.
What is the molecular structure?We know that the shape of a molecule is determined by the number of the electron pairs that we can find in the molecule. In this case, we can see that there are six electron pairs that surround the molecule as shown.
Now, we should know that we have four groups that are around the xenon central atom and then we have two lone pairs and this would then correspond to a square planar geometry of the molecule.
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PLEASE HELP ASAP URGENT WILL GIVE BRAINIEST (CORRECT ANSWERS ONLY!!!!)
7.0 mol Mn can form 7.0 mol MnO and 5.0 mol O2 can form 10.0 mol MnO. What mass of MnO forms during the reaction?
MnO: 70.94 g/mol
[?] g MnO
The mass of the manganese oxide MnO forms during the reaction is equal to 496.58 grams.
What is a mole?A mole of substance can be defined as a standard unit that is used to calculate how many entities such as atoms, molecules, or particular particles are present in a given amount of substance.
The number of elementary units in 1 mole was found to be 6.023 ×10 ²³ which is known as Avogadro’s constant.
The reaction of manganese and oxygen can be represented as:
[tex]2Mn + O_2\longrightarrow 2MnO[/tex]
Given, 7 mol of manganese Mn can form MnO = 7 mol
5 mol O₂ gas can form MnO = 10 mol
From the equation, 2 mol of Mn reacts with oxygen gas = 1 mol
Then, 7 mol of manganese Mn will react with oxygen = 7/2 = 3.5mol
Therefore, if we have 7 mol of manganese and 5 mol of O₂ gas then Mn will be the limiting reagent.
Then 7 mol of manganese (Mn) will form MnO = 7 mol
The mass of seven mol of MnO = 7 × 70.94 = 496.58 g
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In(s) = -4197 (1/T)+17.96 how many grams of salt will dissolve in 5 ml of water at 85c
ln(s) = -4197 (1/T) + 17.96, the amount of salt that will dissolve in 5ml of water at 85°c is 25.6grams, option B.
How is linear regression calculated?With the equation, ln(s) = -4197 (1/T) + 17.96
Where, ln(s) = natural log of substance in solid state
T = temperature of water, 85°c = (85 + 273) to kelvin
Applying to the equation;
ln(s) = -4197 x 1/(85 + 273)) + 17.96
ln(s) = (-4197 /(358)) + 17.96
ln(s) = -11.72 + 17.96
ln(s) = 6.236, to the nearest two decimals, 6.24
s = [tex]e^{6.24}[/tex] where, e is the base the natural log
s = 512.8 grams per 100ml (513, nearest whole number)
If 100ml = 513 grams,
then 5ml = (5 / 100) x 513
s = 25.64 grams/5ml
s = 26 grams
The full question is:
The result of your solubility of a salt experiment led to the following linear regression equation:
ln(s) = -4197 (1/T) + 17.96
How many grams of salt will dissolve in 5 ml of water at 85°c?
a. 260
b. 26
c. 5
d. 511
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which statement does not describe a general function of the pentose phosphate pathway
a. allows for the conversion of hexoses into pentoses that may be used as precursors in the synthesis of nucleosides
b. produces reduced molecules whose electrons may be shuttled to the mitochondria for oxidative phosphorylation and ATP production
c. used to produce NADPH for reductive biosynthesis of fatty acids
d. allows a repair of oxidative damage
The statement which does not describe the general function of pentose phosphate is that allows a repair of oxidative damage.
What is pentose phosphate pathway?A metabolic mechanism that runs parallel to glycolysis is the pentose phosphate pathway, also known as the phosphogluconate pathway, the hexose monophosphate shunt, and the HMP Shunt. It produces ribose 5-phosphate, a precursor for the synthesis of nucleotides, pentoses (5-carbon sugars), and NADPH.
Despite the fact that the pentose phosphate route does entail the oxidation of glucose, it plays a more catabolic than catabolic role. The route is particularly crucial for red blood cells (erythrocytes).
The journey is divided into two main stages. The oxidative phase, when NADPH is produced, is the first. The non-oxidative synthesis of 5-carbon sugars is the second. The generation of reducing equivalents, in the form of NADPH, used in reductive biosynthesis such as fatty acid synthesis.
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*30 Points* What is the electronegativity difference of the compound HNO?
The three elements of this compound are: Hydrogen, Nitrogen, and Oxygen, and have no subscript number.
Answer:
A
Explanation:
What chemical species are produced when borax dissolves in water? select all that apply.
When borax dissolves in water, two chemical species are produced: B(OH)3 and [B(OH)4].
Describe Borax.Boron, oxygen, and soda are all ingredients in the substance known as borax. The most typical forms of borax are pentahydrate salts, which are soft, colorless, anhydrous, and decahydrate salts. Borax (Sodium Tetraborate Decahydrate) has the chemical formula Na2B4O7.10H2O.
How does a borax solution form in water?Borax is a white, crystalline substance that dissolves more readily in hot water than in cold. Boric acid, which makes up the aqueous solution of borax, is alkaline. Borax ionizes the (Hydroxyl ion) when it dissolves in water, and by hydrolyzing the ion of borate, boric acid is created. Aqueous borax solutions are naturally alkaline because boric acid is a mild acid and NaOH is a strong alkali.
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Draw the Lewis dot diagram for a H -
anion.
Lewis dot diagram is the diagram which describes the chemical bonding between atoms in a molecule. It also represents the total number of lone pairs present on the atom. The lewis dot diagram for H⁻ ion is shown in the attached image.
Since hydrogen contains one electron in the s orbital and it has electronic configuration 1s¹. When hydrogen forms anion, the electron will goes in s-orbital and the electronic configuration of H⁻ ion is 1s². It means both electrons are paired and it shows as a lone pair in the lewis dot diagram of H⁻ anion.
Therefore, the lewis dot diagram is shown in the image which is attached with the question.
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HELP!!!!!!! (CORRECT ANSWERS ONLY!!!!)
7.0 mol Mn can form 7.0 mol MnO and 5.0 mol O2 can form 10.0 mol MnO. What mass of MnO forms during the reaction?
MnO: 70.94 g/mol
[?] g MnO
The mass of the MnO forms during the reaction is equal to 496.58 g.
What is a mole?A mole can be a standard unit that is used to determine how many entities such as atoms, molecules, ions, or other particular particles are present in a given amount of substance.
The number of elementary entities in one mole was found to be 6.023 × 10 ²³ which is known as Avogadro’s constant.
The reaction of Mn and oxygen is represented as:
[tex]2Mn + O_2 \longrightarrow 2 MnO[/tex]
Given, 7 mol of Mn can form MnO = 7 mol
5 mol oxygen gas can form MnO = 10 mol
From the equation, we can say that 2 mol of Mn reacts with oxygen = 1 mol
Then, 7 mol of Mn will react with oxygen = 7/2 = 3.5 mol
Therefore, if we have 7 mol of Mn and 5 mol of O₂then Mn is the limiting reagent.
Then 7 mol of MnO will form MnO = 7 mol
The mass of 7 mol of MnO = 7 ×70.94 = 496.58 g
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Answer:
rounded to ones is 496.60
which of the bonds shown in red are expected to have ir-active stretching frequencies?
C-C triple bond have different environment. Hence, it will show IR active stretching frequency.
What makes a stretch IR active?To be IR active, a molecule's dipole moment must change as a result of the vibration caused by IR light absorption. The dipole moment is a vector quantity that is affected by the molecule's orientation and the photon electric vector.Some bonds absorb infrared light more strongly than others, whereas others do not. A periodic shift in the dipole moment of the molecule is required for a vibrational mode to absorb infrared light. These vibrations are referred to as infrared active.To learn more about Dipole moment refer,
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The IR active stretching would be observed for the bonds that are not symmetrical.
Which bonds are IR active?We know that compounds that are polar implies that the molecules do have a dipole moment in the molecule. This means that the bond is not symmetrical owing to the fact that the groups that are attached to the central atom of the bond are not the same.
The IR active compounds are the compounds that are have bonds that are not symmetrical. All we need is to look at the bonds and find out the ones that are not symmetrical and hence would have a net dipole moment.
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The body contains organ systems that interact with each other to carry out all necessary functions for survival and growth. Which statement provides evidence for the claim?
The body contains organ systems that interact with each other to carry out all necessary functions for survival and growth are digestive , respiratory , circulatory system.
The body contains organs system that interact with each other to carry out all necessary functions for survival and growth are digestive system , respiratory system and circulatory system. They are involved in breakdown and transport of food and the transport of oxygen throughout the body to cell. where they are used up as energy , growth and repair.
Thus, The body contains organ systems that interact with each other to carry out all necessary functions for survival and growth are digestive , respiratory , circulatory system.
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which of the following quantum numbers (n, l, ml, ms) is not permissible? and why?
a) 1, 0, 0, +1/2
b) 4, 2, -1, -1/2
c) 5, 3, -3, -1/2
d) 2, 1, -1, +1/2
e) 3, 2, -2, -1/2
In the given set of quantum numbers, the set of quantum numbers which is not permissible or forbidden is 4, 2, -1, -1/2, which is option b.
A quantum number is the set of number, which is used to describe the position and energy of the electron in an atom. There are four types of quantum number, which is principal, azimuthal, magnetic, and spin quantum number.
In first option, by looking at first two numbers it is observed that electron is from 1s orbital and it is half-filled. Hence, it is permissible.
In the second option, electron is from 4d orbital and the electron is filled in [tex]p_{y}[/tex] orbital. The electron should be filled first in [tex]p_{z}[/tex] orbital which has ml value -2. Hence, the second set is not permissible.
In the third option, electron is from 5f orbital and it is half-filled in downward position. Hence this set is permissible
In the fourth option, electron is from 2p orbital and it is filled in upward position. Hence, this set is permissible.
In the fifth option, electron is from 3d orbital and it is filled in downward position. Hence, this set is permissible.
Therefore, the set of quantum number which is not permissible is 4, 2, -1, -1/2.
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12) What is the mass of 3.5 moles of CO₂?
Answer:
154 grams CO₂
Explanation:
To find the mass of CO₂, you need to multiply the mole value by the molar mass of CO₂. The molar mass represents the mass (grams) of CO₂ per every one mole. It is important to arrange the ratio/conversion in a way that allows for the cancellation of units.
Atomic Mass (C): 12.011 g/mol
Atomic Mass (O): 15.999 g/mol
Molar Mass (CO₂): 12.011 g/mol + 2(15.999 g/mol) = 44.009 g/mol
3.5 moles CO₂ 44.009 g
------------------------- x -------------------- = 154 grams CO₂
1 mole
What is the expected freezing point of a 0.50 m solution of Cs2SO4 in water? Kf for water is 1.86°C/m.
-6.5
-1.9
-2.8
-0.93
+0.93
Option C. The expected freezing point of a 0.50 m solution is - 2.8°C.
The freezing point is the temperature at which a liquid becomes stable. As with the melting point, multiplied stress typically raises the freezing factor. The freezing point is lower than the melting point in the case of mixtures and for sure natural compounds such as fat.
Calculation:-
ΔT f = i × K f × m
Cs₂SO₄ ------> 2Li⁺ + SO²⁻
Given,
T f° = 0.0 °C
If = 1.86 °C/m
m = 0.50 m
i = 3
substitution of the values in the equation
0 °C - T f = 3 × 1.86 °C/ × 0.50
0 °C - T f = 2.8 C
0 ° C - 2.8°C = T f
- 2.8°C = T f
Hence, the freezing point is Cs₂SO₃ solution is - 2.8°C .
The freezing point of water and melting point is zero °C or 32 °F. The temperature may be lower if supercooling takes place or if there are impurities present in the water that may purpose freezing factor despair to occur. below positive conditions, water may also remain a liquid as bloodless as -forty to -42°F
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If you were to combine two carbon-12 atoms in a fusion process, what element would you get?.
The element would you get is Mg. 6C12 + 6C12 1 11Na24 + +1e0.
The first step in making carbon is to fuse the nuclei of hydrogen the lightest element to make helium the second lightest element. The next step is to fuse the two helium 4 nuclei. Each contains two protons and two neutrons. Forms beryllium-8. This takes in another helium and produces carbon-12.
The main problem in the carbon cycle is proton addition but after a carbon-12 nucleus fuses with a proton to form nitrogen-13 one of the protons decays to carbon-13 emitting a positron and a neutrino. Two more proton captures produce nitrogen-14 and then oxygen-15. Stellar Fusion Reactors In massive stars hydrogen burns to form helium. This produces carbon which can be further processed into oxygen and heavier elements.
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How many types of atom are contained in an element
Answer:
There are more than 109 different types of atom – one for each element. Differences between the atoms give the elements their different chemical properties. In 2001, there were 115 known elements. However, those above 109 are highly unstable and have been made in only tiny quantities.
Explanation:
A particular element is composed of only one type of atom. Atoms are further composed of subatomic particles called electrons, protons and neutrons.
Choose the best answer.
Why is OTEC not currently used?
It is dangerous.
It is unethical.
It is in an experimental phase and is very expensive.
It was outlawed.
OTEC not currently used because it is in an experimental phase and is very expensive
Ocean thermal energy conversion is the electricity generation system and the OTEC refer to using the temprature differences between the deep parts of the sea and which are cold and the shallow part of the sea and which are cold to run a heat engine and produce useful work and the deeper part of ocean are cooler because the heat of sunlight cannot penetrate very deep into the water and OTEC are not currently used because it is an experimental phase and very expensive and it is currently used in japan
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what acts as a connector to help convert the nucleotide sequence of mrna into the amino acid sequence of a polypeptide during translation?
Answer:The cell has just transcribed this mRNA strand from its DNA, and it now translates the mRNA's nucleotide sequence into a chain of amino acids. This chain, called a polypeptide, forms the basic structure of a protein. A cellular component called a ribosome coordinates the translation process.
Explanation:
Around each indicated atom in the organic structure, determine the ideal expected angle.
Angle A: Choose.. degrees
Angle B: Choose...
Angle C: 180 degrees
Angle D : Choose...
Angle E: Choose... degrees
Choose.
104.5
120
180
107
109.5
There are two characteristics of molecules, one is geometry and other is shape. Shape is excluding lone pair surrounding the central element and geometry is including the lone pair. Therefore, the angles can be found out by VSEPR theory.
What is VSEPR theory?VSEPR stands for valence shell electron pair repulsions. VSEPR theory is used to predict the shape and geometry of molecules on the basis of valence electrons pairs that are present around the central element of the molecule.
According to VSEPR theory, Lone pair lone pair repulsion is greater than bond pair bond pair repulsion. There are so many limitations of VSEPR theory. There is a repulsion between bond pair electrons and lone pairs present on the central element.
Angle A:120 since lone pair is in conjugation with the ring so sp² hybridized.
Angle B:120, sp² hybridized
Angle C:180, sp hybridized
Angle D:109.5 sp³ hybridized
Angle E:120, sp² hybridized
Therefore, the angles can be found out by VSEPR theory.
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Write a net ionic equation for the reaction that occurs when excess hydroiodic acid and sodium sulfite (aq) are combined.
The net ionic equation for chemical reaction when excess of hydroiodic acid combines with sodium sulfite is 2 H[tex]^+[/tex] [tex]_(aq)[/tex] + S[tex]^2-[/tex][tex]_(aq)[/tex][tex]\rightarrow[/tex] H₂S[tex]_(g)[/tex].
What is ionic equation?Ionic equation is defined as a chemical equation which represents electrolytes in aqueous solutions and are expressed as dissociated ions. Ions present in aqueous solutions are stabilized by ion dipole interactions with the water molecules which are present.
An ionic equation can be written for any electrolyte which dissociates and reacts with the polar solvent. In a balanced ionic equation , number and type of atoms on each sides of reaction arrow are same. Even the net charge on both sides of the arrow is same.
Strong acids and bases exist as dissociated ions present in the solution and are written in forms of ions in ionic equation.Weak acids and bases do not dissociate completely and hence are written in the form of molecular formula.
For the given reaction, net ionic equation is obtained as,by balancing the reaction between hydroiodic acid and sodium sulfite and then writing its dissociated form,
2 H[tex]^+[/tex][tex]_(aq)[/tex] + 2 I[tex]^-[/tex][tex]_(aq)[/tex] +2 Na [tex]^+_(aq)[/tex] + S[tex]^2- _(aq)\rightarrow[/tex] H₂S[tex]_(g) + 2 Na ^+ _(aq)[/tex] +2 I[tex]^-_(aq)[/tex]
Removing the spectator ions , final net ionic equation is,2 H[tex]^+[/tex] [tex]_(aq)[/tex] + S[tex]^2-[/tex][tex]_(aq)[/tex][tex]\rightarrow[/tex] H₂S[tex]_(g)[/tex].
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Question 4: Balancing Redox Equations (5 points)
Use the following steps to balance the redox reaction below:
Mg + Au* → Mg2+ + Au
a. Write the oxidation and reduction half-reactions. Make sure each half-reaction
is balanced for number of atoms and charge. (3 points)
b. Multiply each half-reaction by the correct number, in order to balance charges
for the two half-reactions. (1 point)
The balanced redox reaction is
Mg(s) + 2Au⁺ (aq) → Mg²⁺ (aq) + 2Au(s)
Equalizing the right and left sides by the stoichiometric coefficient balances the response. The redox reactions have been balanced and fixed by simplifying the numbers.
The oxidation half-reaction:
Mg → Mg²⁺ + 2e⁻
The reduction half-reaction:
2Au + 2 e⁻ → 2 Au
The overall balanced reaction is:
Mg(s) + 2Au⁺ (aq) → Mg²⁺ (aq) + 2Au(s)
The redox equation can be balanced using the following stepwise procedure. Split the equation into two half-reactions. Balance the mass and charge half-reactions. Balance the number of electrons transferred in each half-reaction. Add half-reactions together.
There are two ways to balance redox reactions. One uses the change in the oxidation numbers of the oxidizing and reducing agents and the other divides the redox reaction into two half-reactions reduction and oxidation. The first step in balancing a redox reaction is to split the reaction in half.
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The element Chromium has 4 naturally occurring isotopes. Use the relative abundance of each to calculate the average atomic mass of chromium. (Must show work!)
Cr-50 = 4.34%, Cr-52 = 83.79%, Cr-53 = 9.50%, Cr-54 = 2.37%
According to the given statement The average Cr atomic mass unit is 51.9963 amu.
What defines the atomic mass?A single atom's atomic mass is only its total mass, and it is usually given in atomic mass units, or amu. A carbon atom with six neutrons, or helping students learn, has an atomic mass of Twelve amu by definition.
Do elements have atomic mass?The entire weight of one atom in an element is referred to as its atomic mass. The atomic mass is its average atomic mass given in atomic mass units (amu, also known as daltons, D). Atomic weight is another name for the atomic number.
Briefing:Chromium exists in four isotopes that are naturally occurring: 50Cr (atomic mass: 49.9460 amu), 52Cr (atomic mass: 51.9405 amu), 53Cr (atomic mass: 52.9407 amu), and 54Cr (atomic mass: 2.37% amu).
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Write a balanced equation for the reaction between and to give and , and calculate δh°.
Answer:
∆H° = is the answer ok I am sure it is
If there was splattering out of the evaporating dish while you were completing the heating process, how would this have an effect on the subscript of chlorine in the formula? (The formula is Magnesium Chloride)
HCl may spatter in a harmful manner if you use too much heat. 5) Heat the mixture until all of the water has evaporated.
By heating, what do you mean?Heat is the result of the movement of kinetic energy within a material or an item, or by a source of energy to a material or an object. Radiation, conduction, & convection are the three mechanisms through which such energy can be transferred.
What kind of heating is most cost-effective in Australia?Reverse-cycle air con is by far the least expensive way to heat ones home based solely on operating costs. According to our calculations, an opposite way air conditioner will only cost slightly more to run for an entire year than just an immersion heater will charge to run for just three months during the winter.
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Write the formula of the structure that would have the greatest internuclear distance between the pairs.
An element's electronegativity determines whether it is ionic or non-ionic. Fluorine has the most electronegativity while iodine has the lowest, which means that the Cs I ionic bond's power of attraction is at its lowest, allowing for the largest possible distance between their molecules.
By intermolecular contact, what do you mean?The attracting and repellent forces that develop between the molecules of a substance are referred to as intermolecular forces (IMF), which is sometimes shortened. These forces act as a bridge between the individual molecules of a substance. Intermolecular forces are primarily responsible for the physical and chemical properties of matter.
Which four intermolecular interactions are there?The following are the four main intermolecular forces: Van der Waals dipole-dipole interactions < Van der Waals dispersion forces <Ionic bonds <Hydrogen bonds .
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