H2o electron geometry and molecular geometry

This online quiz is intended to give you extra practice in identifying the molecular and electron geometry of chemical compounds using VSEPR theory. Select your preferences below and click 'Start' to give it a try! Number of problems: 1. 5. 10. 25. 50. Question types (select at least one):

Two regions of electron density around a central atom in a molecule form a linear geometry; three regions form a trigonal planar geometry; four regions form a tetrahedral …The answer is the molecular geometry of water would be bent. Notice there are 4 attachments, or, electron groups surrounding oxygen. This would make the electron geometry tetrahedral. However, this is not the molecular geometry. Two of these attachments are bonds and the other two are lone pairs. Therefore, the resulting molecular geometry is a ...Electron geometry teaches us about the arrangement of different electron groups. Molecular geometry, on the other hand, helps us understand the entire atom and its arrangement. It is the 3D arrangement of all the atoms in a particular molecule. So, when you compare them, you will note that atoms have different arrangements in electron geometry ...The Lewis structure of H 2 O indicates that there are four regions of high electron density around the oxygen atom: two lone pairs and two chemical bonds: Figure 7.6.9 7.6. 9. Thus, the electron-pair geometry is tetrahedral and the molecular structure is bent with an angle slightly less than 109.5°.D With two nuclei around the central atom and one lone pair of electrons, the molecular geometry of SnCl 2 is bent, like SO 2, but with a Cl–Sn–Cl bond angle of 95°. The molecular geometry can be described as a trigonal planar arrangement with one vertex missing. Exercise. Predict the molecular geometry of each molecule. SO 3; XeF 4 ...Depending on how many of the clouds are lone pairs, the molecular geometry will be tetrahedral (no lone pairs), trigonal pyramidal (one lone pair), or bent (two ...

An explanation of the difference between molecular geometry and electron geometry. The primary difference is that with molecular geometry we include only the... In the Lewis structure of CH3Cl, Carbon is at the central position and all the other atoms around it. The bond angles of Carbon with Hydrogen and Chlorine atoms are 109.5 degrees. This molecule has a tetrahedral shape, and the central carbon atom has sp3 hybridization. Chloromethane or Methyl chloride having a molecular formula of …Electron geometry teaches us about the arrangement of different electron groups. Molecular geometry, on the other hand, helps us understand the entire atom and its arrangement. It is the 3D arrangement of all the atoms in a particular molecule. So, when you compare them, you will note that atoms have different arrangements in electron geometry ...There are two lone pairs of electrons on each Oxygen atom; thus, there are four lone pairs of electrons for H2O2. As each Oxygen atom forms an sp3 hybrid orbital, H2O2 has sp3 hybridization. The bond angle for H2O2 in its gas phase is 94.8°and has a bond angle of 101.9°. It has tetrahedral electron geometry and a bent molecular shape.Molecular Partners News: This is the News-site for the company Molecular Partners on Markets Insider Indices Commodities Currencies Stocks1. The central atom, beryllium, contributes two valence electrons, and each hydrogen atom contributes one. The Lewis electron structure is. 2. There are two electron groups around the central atom. We see from Figure 5.4.2 5.4. 2 that the arrangement that minimizes repulsions places the groups 180° apart. 3.CH3OH Lewis Structure. Lewis dot structure is a pictorial representation of the molecule, it’s bonding with other atoms and the arrangement of atoms in the compound. It helps in knowing the number of bonded electrons, lone pairs, and the compound’s molecular shape. Valence electrons help in drawing this Lewis structure, as all the electrons ...Figure 7.2.7. (a) H2O H 2 O has four regions of electron density around the central atom, so it has a tetrahedral electron-pair geometry.

Aug 20, 2021 · Figure 4.3.5 4.3. 5: (a) The electron-pair geometry for the ammonia molecule is tetrahedral with one lone pair and three single bonds. (b) The trigonal pyramidal molecular structure is determined from the electron-pair geometry. (c) The actual bond angles deviate slightly from the idealized angles because the lone pair takes up a larger region ... The domain geometry for a molecule with four electron pairs is tetrahedral, as was seen with CH4 CH 4. In the ammonia molecule, one of the electron pairs is a lone pair rather than a bonding pair. The molecular geometry of NH3 NH 3 is called trigonal pyramidal (see figure below). Figure 9.15.3 9.15. 3: Ammonia molecule.Electron group geometry is the three-dimensional arrangement of atoms in a molecule. The geometry of a molecule is an important factor that affects the physical and chemical properties of a compound. Those properties include melting and boiling points, solubility, density, and the types of chemical reactions that a compound undergoes.Electron group geometry is the three-dimensional arrangement of atoms in a molecule. The geometry of a molecule is an important factor that affects the physical and chemical properties of a compound. Those properties include melting and boiling points, solubility, density, and the types of chemical reactions that a compound undergoes.

Free stuff in charlottesville va.

There are three single bonds and one lone pair of electrons in the NH3 molecule. It has a molecular geometry of trigonal pyramidal which also looks like a distorted tetrahedral structure. The shape is distorted because of the lone pairs of electrons. This pair exerts repulsive forces on the bonding pairs of electrons.Going by this, the H2O molecule would seem to qualify for 2 electron clouds and linear geometry with a bond angle of 180 degrees. ... The electron domain geometry includes the geometry of both lone pair electrons and bonds (i.e. all electron domains). The molecular geometry tells the shape that only the bonds make ...If all of the electron pairs surrounding the central atom are shared with neighboring atoms, then the coordination geometry is the same as the molecular geometry. The application of VSEPR theory then reduces to the simple problem of naming (and visualizing) the geometric shapes associated with various numbers of points surrounding a central point …Lewis electron structures give no information about molecular geometry, the arrangement of bonded atoms in a molecule or polyatomic ion, which is crucial to understanding the chemistry of a molecule. The valence-shell electron-pair repulsion (VSEPR) model allows us to predict which of the possible structures is actually observed in most cases.The electron group geometry for a molecule with four electron pairs is tetrahedral, as was seen with \(\ce{CH_4}\). In the ammonia molecule, one of the electron pairs is a lone pair rather than a bonding pair. Although the lone pair is not visible, it will affects the location and bond angles among other atoms in the molecule. ... Molecular geometries (linear, trigonal, tetrahedral, trigonal bipyramidal, and octahedral) are determined by the VSEPR theory. A table of geometries using the VSEPR theory can facilitate drawing and understanding molecules. The table of molecular geometries can be found in the first figure. The second figure serves as a visual aid for the table ...

The following procedure uses VSEPR theory to determine electron group geometry and molecular structures (molecular shape): Draw the Lewis structure of the molecule or polyatomic ion. Count the number of electron groups or regions of electron density (lone pairs and bonds) around the central atom. A single, double, or triple bond counts as one ...a. electron geometry b. molecular geometry c. bond angles d. polarity e. central atom hybridization; Provide the following information for the molecule CS2. a. electron geometry b. molecular geometry c. bond angles d. polarity e. central atom hybridization; Determine the electron geometry (eg) and molecular geometry (mg) of CH_3^{+1}.1 Answer. Maxwell · Stefan V. Jul 17, 2016. The electronic geometry gives water a tetrahedral shape. The molecular geometry gives water a bent shape. …If all of the electron pairs surrounding the central atom are shared with neighboring atoms, then the coordination geometry is the same as the molecular geometry. The application of VSEPR theory then reduces to the simple problem of naming (and visualizing) the geometric shapes associated with various numbers of points surrounding a central point …Electronic banking takes several forms. Using a debit card, visiting an automated teller machine and banking by cellphone are all types of electronic banking. If you set up an onli...NF3 Molecular Geometry Molecular geometry or molecular shape is an important concept that we need to decipher while we are learning the chemical bonding of any chemical composition. While Lewis Structure gives us an idea about the internal bond types and valence electron sharing inside a given molecule, it can only explain a two …The molecular geometry of SO2 is bent, with a bond angle of 120°. We can easily find out the molecular geometry of any compound using the given chart. Here, A = central atom, X = surrounding atoms and E = the lone pairs. SO2 is an AX2E type molecule, with 2 surrounding atoms i.e oxygen, and 1 lone pair of sulfur. But the electron …SO42- Lewis Structure, Hybridization, Bond Angle and Molecular Geometry. SO42- is a chemical name for the sulfate ion. It comprises one Sulphur atom, four Oxygen atoms, and a charge of -2. It is a polyatomic anion and is used widely to synthesize other sulfates such as Zinc Sulfates, Magnesium sulfates, Iron sulfates, and much more.Two regions of electron density around a central atom in a molecule form a linear geometry; three regions form a trigonal planar geometry; four regions form a …The Lewis structure of H 2 O indicates that there are four regions of high electron density around the oxygen atom: two lone pairs and two chemical bonds: Figure 7.6.9 7.6. 9. Thus, the electron-pair geometry is tetrahedral and the molecular structure is bent with an angle slightly less than 109.5°.

Aug 1, 2023 ... With four domains in its valence shell, the electron geometry of the H2O molecule is determined to be tetrahedral, which means that we could ...

The total valence electron available for the NF3 lewis structure is 26. Hybridization of NF3 is Sp³. NF3 is polar in nature. The molecular geometry or shape of NF3 is a trigonal pyramid and its electron geometry is tetrahedral. NF3 lewis dot structure contains 1 lone pair and 3 bonded pairs.Molecular geometry, on the other hand, is the three-dimensional structure of atoms in a molecule that determines its shape. It aids in comprehending the entire atom and its arrangement. If all of the electron groups are bonded, and there are no lone pairs, the electron geometry and molecular geometry are the same. Read more: Molecular geometryA H 2 S has four electron pairs around the sulfur atom with two bonded atoms, so the VSEPR model predicts a molecular geometry that is bent, or V shaped. B Sulfur has a 3 s 2 3 p 4 valence electron configuration with six electrons, but by hybridizing its 3 s and 3 p orbitals, it can produce four sp 3 hybrids.NH3 Molecular Geometry. Ammonia has a tetrahedral molecular geometry. All the Hydrogen atoms are arranged symmetrically around the Nitrogen atom which forms the base, and the two nonbonding electrons form the tip which makes the molecular geometry of NH3 trigonal pyramidal. NH3 Hybridization. The Nitrogen atom has the electronic configuration ... sp. Give the hybridization for the C in C2F2. sp. Identify the number of electron groups around a molecule with sp2 hybridization. 3. Give the electron geometry (eg), molecular geometry (mg), and hybridization for NH3. eg = tetrahedral, mg = trigonal pyramidal, sp3. We have an expert-written solution to this problem! Question: Draw the structure H2O known as water. Identify its Electron Domain Geometry (EDG) and its Molecular Geometry (MG) EDG = Tetrahedral,MG= Octahedral EDG = Trigonal pyramid, MG = Square planar EDG= Linear, MG=B Bent EDG = Tetrahedral, MG= Bent. Show transcribed image text. There are 2 steps to solve this one. Expert-verified.Figure 4.3.4: CH 4. The electron group geometry of the methane molecule is referred to as tetrahedral. The H − C − H bond angles are 109.5o, which is larger than the 90o that they would be if the molecule was planar. This way, the bonds are as far apart as possible to minimize electron repulsion.The five atoms are all in the same plane and have a square planar molecular structure. Figure 5.2.11: (a) XeF4 adopts an octahedral arrangement with two lone pairs (red lines) and four bonds in the electron-pair geometry. (b) The molecular structure is square planar with the lone pairs directly across from one another.Aug 1, 2023 ... With four domains in its valence shell, the electron geometry of the H2O molecule is determined to be tetrahedral, which means that we could ...The main difference between electron geometry and molecular geometry is that electron geometry is found by taking both lone electron pairs and bonds in a …

Natalie and scotty leaked video.

38 weeks pregnant and 2 cm dilated.

CH2O has a molecular geometry of AX3, trigonal planar shape, and an sp2 hybridization. It is a trigonal planar in shape with bond angles of 120 degrees. It is polar due to the difference in the partial charges on Carbon and Oxygen atom. Formaldehyde has two lone pairs of electrons on the Oxygen atom and no lone pairs on the central atom ...Thus, the electron-pair geometry is tetrahedral and the molecular structure is bent with an angle slightly less than 109.5°. In fact, the bond angle is 104.5°. Figure 7.2.7. (a) H2O H 2 O has four regions of electron density around the central atom, so it has a tetrahedral electron-pair geometry.Dec 30, 2017 ... In this video we'll use VSPRE Theory to practice the rules for identifying the major molecular geometries, including bond angles.You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer. Question: H2O 1) Lewis Structure: 2) Electron pair geometry: Molecular geometry: 3) Dipole moment? 4) Hydrogen bonds? 5) Intermolecular forces: B: CH3COOCH2CH3 1) Lewis Structure: 2) Electron pair geometry: Molecular …D With two nuclei around the central atom and one lone pair of electrons, the molecular geometry of SnCl 2 is bent, like SO 2, but with a Cl–Sn–Cl bond angle of 95°. The molecular geometry can be described as a trigonal planar arrangement with one vertex missing. Exercise. Predict the molecular geometry of each molecule. SO 3; XeF 4 ... The electron geometry and molecular geometry of a water (H 2 O) molecule are, respectively: Select one: tetrahedral, tetrahedral. trigonal planar, trigonal planar. tetrahedral, bent. trigonal planar, bent. There are 2 steps to solve this one. Expert-verified. To accommodate the electrons shared in these bonds, it needs to form 4 hybrid orbitals. As a result, there is a formation of one s-hybrid orbital and three p-hybrid orbitals. (Each s orbital can accommodate 2 electrons, and p orbital can accommodate 6 electrons). Hence SO42- ion has an sp3 hybridization. SO42- Molecular GeometryBrF5 Molecular Geometry The bond angle between each participating atom is 90 where the structure of BrF5 is square pyramidal . This can be studied with the help of Valence Shell Electron Pair Repulsion (VSEPR) theory, which says the overall shape of a molecule is decided by the total number of bonding and non-bonding electrons along … ….

CH3OH Lewis Structure. Lewis dot structure is a pictorial representation of the molecule, it’s bonding with other atoms and the arrangement of atoms in the compound. It helps in knowing the number of bonded electrons, lone pairs, and the compound’s molecular shape. Valence electrons help in drawing this Lewis structure, as all the electrons ...If all of the electron pairs surrounding the central atom are shared with neighboring atoms, then the coordination geometry is the same as the molecular geometry. The application of VSEPR theory then reduces to the simple problem of naming (and visualizing) the geometric shapes associated with various numbers of points surrounding a central point …Structure of Water. Water is a simple molecule consisting of one oxygen atom bonded to two different hydrogen atoms. Because of the higher electronegativity of the oxygen atom, the bonds are polar covalent ( polar bonds ). The oxygen atom attracts the shared electrons of the covalent bonds to a significantly greater extent than the hydrogen atoms.2 days ago · Step 1. We shall start by calculating the number of valence electrons in each atom of CH2Cl2 in order to see how short an atom is from an octet (or duplet in the case of hydrogen). i. The atomic number of carbon is 6; therefore, it possesses 6 electrons in its neutral form. When all electron groups are bonds (m=6 or AX 6), the molecular geometry is an octahedron with bond angles of 90° between adjacent bonds. When there is one lone pair (m=5, n=1 or AX 5 E 1 ) we now distinguish between the axial and equitorial positions; the lone pair is considered to be in one of the axial positions, while the bond directly …The electron geometry and molecular geometry of a water (H 2 O) molecule are, respectively: Select one: tetrahedral, tetrahedral. trigonal planar, trigonal planar. tetrahedral, bent. trigonal planar, bent. There are 2 steps to solve this one. Expert-verified. Using the cross bow arrow shown below we can show that it has a net dipole. The net dipole is the measurable, which is called the dipole moment. Dipole moment is equal to the product of the partial charge and the distance. The equation for dipole moment is as follows. μ = δ × d (3.7.1) (3.7.1) μ = δ × d. with. Fingerprint scanners like those on the latest iPhones could soon give way to another biometric identifier: The geometry of the veins in your hands. Fingerprint scanners like those ... Thus, the electron-pair geometry is tetrahedral and the molecular structure is bent with an angle slightly less than 109.5°. In fact, the bond angle is 104.5°. Figure 7.2.7. (a) H2O H 2 O has four regions of electron density around the central atom, so it has a tetrahedral electron-pair geometry. In the examples provided, we examine the molecular geometry of two molecules, water (H2O) and ammonia (NH3). For each molecule, we identify the central atom, determine the number of valence electrons for the central atom, count the electrons donated by hydrogen atoms, and calculate the total number of electrons surrounding the central atom. H2o electron geometry and molecular geometry, H3O+ Molecular Geometry. The molecular shape of H3O+ is a trigonal pyramid and electronic geometry is tetrahedral. From the above chart, we can see that hydronium ion is a AX3E type molecule (A= central atom, X= bonded atom, E= lone pair on A). So according to the VSEPR chart, H3O+ has trigonal pyramid as its molecular shape and tetrahedral as ..., For example; four electron pairs are distributed in a tetrahedral shape. If these are all bond pairs the molecular geometry is tetrahedral (e.g. CH 4). If there is one lone pair of electrons and three bond pairs the resulting molecular geometry is trigonal pyramidal (e.g. NH 3). If there are two bond pairs and two lone pairs of , Determine the molecular geometry, electron group geometry and polarity of molecules with those having more than 1 central atom. Does resonance affect the polarity of molecule? Determine the electron geometry, molecular geometry, and polarity of XeO3. What is the electron geometry and molecular geometry for SeF6? Is it polar or nonpolar?, H3O+ Molecular Geometry. The molecular shape of H3O+ is a trigonal pyramid and electronic geometry is tetrahedral. From the above chart, we can see that hydronium ion is a AX3E type molecule (A= central atom, X= bonded atom, E= lone pair on A). So according to the VSEPR chart, H3O+ has trigonal pyramid as its molecular shape and tetrahedral as ..., You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer. Question: H2O 1) Lewis Structure: 2) Electron pair geometry: Molecular geometry: 3) Dipole moment? 4) Hydrogen bonds? 5) Intermolecular forces: B: CH3COOCH2CH3 1) Lewis Structure: 2) Electron pair geometry: Molecular …, To summarize this blog post, we can say that XeF4 has 36 valence electrons. It has two lone pairs of nonbonding electrons on the central atom of Xenon. The molecule has octahedral electron geometry and square planar molecular geometry. XeF4 is a nonpolar molecule and has sp3d2 hybridization. At the Geometry of …, The molecular geometry, or three-dimensional shape of a molecule or polyatomic ion, can be determined using valence-shell electron-pair repulsion (abbreviated VSEPR and pronounced “VES-per”) theory, in which the basic principle is valence electrons around a central atom stay as far apart as possible to minimize the repulsions., Table 1.1 Basic VSEPR Shapes. Notes: . For VSEPR purpose, the terms “shape” and “geometry” are interchangeable; “electron pair” and “electron group” are also interchangeable. Multiple bonds (double or triple bond) are regarded as one electron group for VSEPR purpose.; For species that do not have any lone pair electrons (LP), the …, Molecular gastronomy is the art and science of selecting, preparing, serving and enjoying food. Learn about molecular gastronomy at HowStuffWorks. Advertisement ­Even if your culin..., Two regions of electron density around a central atom in a molecule form a linear geometry; three regions form a trigonal planar geometry; four regions form a tetrahedral …, Molecular geometries take into account the number of atoms and the number of lone pair electrons. The main geometries without lone pair electrons are: linear, trigonal, tetrahedral, trigonal bipyramidal, and …, Hydrogen fluoride is a colorless liquid or a gaseous compound having the chemical formula HF. It tends to dissolve in water and the colorless aqueous solution is known as hydrofluoric acid. It has a melting point of -118.50 F and a boiling point of about 670 F. HF has a molar mass of 20.0064 g/mol and a density of 1.15 g/litre as a gas at …, A H 2 S has four electron pairs around the sulfur atom with two bonded atoms, so the VSEPR model predicts a molecular geometry that is bent, or V shaped. B Sulfur has a 3 s 2 3 p 4 valence electron configuration with six electrons, but by hybridizing its 3 s and 3 p orbitals, it can produce four sp 3 hybrids., The molecular geometry of IF5, also known as iodine pentafluoride, is a pyramid with a square base surrounding a central iodine atom. Each of the corners of the pyramid is a fluori..., How to find the molecular geometry for the H2O molecule (water).Join this channel to get full access to Dr. B's chemistry guides:https://www.youtube.com/chan..., We can use the VSEPR model to predict the geometry of most polyatomic molecules and ions by focusing on only the number of electron pairs around the central …, For Hybrid Orbitals, you can always know the VSEPR electron arrangement (see Arrangement of Electron Domains column). Molecular Geometry is based on the ..., Predicting Electron-pair Geometry and Molecular Geometry: Lone Pairs on the Central Atom Predict the electron-pair geometry and molecular geometry of a water molecule. Solution The Lewis structure of H 2 O indicates that there are four regions of high electron density around the oxygen atom: two lone pairs and two chemical bonds: Figure 9., Bent molecular geometry is a kind of molecular geometry in which the central atom has two lone pairs of electrons and is associated with two bond pairs. It is also known as angular or V-shaped. Water (H2O), sulfur dichloride (SCl2), methylene (CH2) and Nitrogen dioxide (NO2) are examples of molecules having a bent geometry., Carbon forms one single bond with the Hydrogen atom and forms a triple bond with the Nitrogen atom. HCN has a total of 10 valence electrons. It is covered under AX2 molecular geometry and has a linear shape. The bond angles of HCN is 180 degrees. Hydrogen Cyanide is a polar molecule., Lewis dot structure of BH 3 contains 1 lone pair on the central atom and 0 lone pairs on outer atoms. The electron geometry of BH 3 is also Trigonal planar as its central atom has 3 regions of electron density. The hybridization of boron in BH 3 is sp 2. Since its steric number is 3. The bond angle in BH 3 is 120º., Molecular Geometry of BF3. The geometry of molecule of BF3 is ‘Trigonal Planar.’. With the reference of Chemistry, ‘Trigonal Planar’ is a model with three atoms around one atom in the middle. It’s like peripheral atoms all in one plane, as all three of them are similar with the 120° bond angles on each that makes them an equilateral ..., In this case the molecular geometry is identical to the electron pair geometry. Group 2: Molecules with one or more lone electron pairs. In this case an extra step is needed to to translate from electron pair geometry to the final molecular geometry, since only the positions of bonded atoms are considered in molecular geometry., Carbon forms one single bond with the Hydrogen atom and forms a triple bond with the Nitrogen atom. HCN has a total of 10 valence electrons. It is covered under AX2 molecular geometry and has a linear shape. The bond angles of HCN is 180 degrees. Hydrogen Cyanide is a polar molecule., Certain atoms, such as oxygen, will almost always set their two (or more) covalent bonds in non-collinear directions due to their electron configuration. Water ..., Electron Geometry: The atom of chemical elements bond to a central atom to form compound and the distance between the bonding electrons contribute to the molecular shape of the compound. When we do not account the nonbonding pairs of electrons, the electron geometry is the same as the molecular shape. The electron geometry represents the shape ..., We continue our discussion of structure and bonding by introducing the valence-shell electron-pair repulsion (VSEPR) model (pronounced “vesper”), which can be used to …, Molecular geometry is a way of describing the shapes of molecules. It applies a theory called VESPR for short. VESPR stands for valence shell electron pair repulsion. This theory basically says that bonding and non-bonding electron pairs of the central atom in a molecule will repel (push away from) each other in three dimensional space and this …, The molecular geometry or shape of PCl 5 is a Trigonal bipyramidal. In the PCl 5 Lewis dot structure, a total of 15 lone pairs and 5 bond pairs are present. The electron geometry of PCl 5 is also Trigonal bipyramidal. The hybridization of phosphorous in PCl 5 is sp 3 d. Since its steric number is 5., Predicting Electron-pair Geometry and Molecular Geometry: Lone Pairs on the Central Atom Predict the electron-pair geometry and molecular geometry of a water molecule. Solution The Lewis structure of H 2 O indicates that there are four regions of high electron density around the oxygen atom: two lone pairs and two chemical bonds: Figure 9., Tetrahedral Geometry. Tetrahedral geometry is a bit harder to visualize than square planar geometry. Tetrahedral geometry is analogous to a pyramid, where each of corners of the pyramid corresponds to a ligand, and the central molecule is in the middle of the pyramid. This geometry also has a coordination number of 4 because it …, It is a hydrocarbon with two carbon connected with a double bond. In this article, we will study ethene (C2H4) lewis structure, molecular geometry, hybridization, is it polar or non-polar, etc. Ethene gas is lighter than air. It has a sweet odor and can cause an explosion. Also, it is not toxic but a simple asphyxiant. Some properties of Ethene., How to find the molecular geometry for the H2O molecule (water).Join this channel to get full access to Dr. B's chemistry guides:https://www.youtube.com/chan...