2024 Lewis structure for methane

Lewis dot structure. G.N Lewis, an American chemist, introduced a simple notation to represent valence electrons in an atom. This notation is called Lewis symbol or electron dot structure. In methane one carbon and four hydrogen atoms are present. Atomic number of hydrogen is 1. Electronic configuration of hydrogen is 1.. Ms. jaadreams

Methane is the ‘natural gas’ burned in home furnaces and hot water heaters, as well as in electrical power generating plants. To illustrate the covalent bonding in methane using a Lewis structure, we first must recognize that, although a carbon atom has a total of six electrons it's Lewis symbol has four unpaired electrons.Using Formal Charges to Distinguish Viable Lewis Structures. 9.5: Covalent Bonding- Lewis Structure. The strength of a covalent bond depends on the overlap between the valence orbitals of the bonded atoms. Bond order is the number of electron pairs that hold two atoms together. Single bonds have a ….The Lewis structure of methane shows a central atom surrounded by four separate regions of high electron density. Each region consists of a pair of electrons bonding the carbon atom to a hydrogen atom. According to the VSEPR model, these regions of high electron density spread out from the central carbon atom in such a way that they are as far ...A Lewis diagram shows how the valence electrons are distributed around the atoms in a molecule. Shared pairs of electrons are drawn as lines between atoms, while lone pairs of electrons are drawn as dots next to atoms. When constructing a Lewis diagram, keep in mind the octet rule, which refers to the tendency of atoms to gain, lose, or share ...I quickly take you through how to draw the Lewis Structure of methane, CH4. I also go over hybridization, shape and bond angle.4/19/10 1:33 AM. In this Education video tutorial you are going to learn how to draw the Lewis structure for carbon dioxide & methanol. Carbon dioxide is CO2. Oxygen atoms don't bond together. So, carbon atom has to be in the center. Oxygen has 6 valence electrons and carbon has 4. Hence, carbon wants to form 4 bonds and each oxygen atom wants ...Methane is a colorless and odorless gas that is highly flammable. The Lewis diagram, also known as the Lewis structure or electron dot structure, is a way to represent the valence electrons of an atom or molecule. It was developed by Gilbert N. Lewis in 1916 and is a useful tool in understanding the bonding and structure of molecules.Lewis Structures with Wedge-Dash Notation. The Lewis structure gives us meaningful information about the bonds between atoms, but Lewis structures do not depict how the molecule exists in three-dimensions. Depicted on the left in Figure 1 is the Lewis structure for methane (CH 4) showing the central carbon atom singly bonded to four hydrogen …Science. Chemistry. Chemistry questions and answers. Question 35 (4 points) Consider the Lewis Structure for methane (CH4). 1) How many lone pairs of electrons are on the central atom? 2) What is the electron geometry? 3) What is the molecular geometry (shape)? 4) What is the hybridization of the central atom? 5) Is the molecule polar or …Methane. Formula: CH 4. Molecular weight: 16.0425. IUPAC Standard InChI:InChI=1S/CH4/h1H4 Copy. IUPAC Standard InChIKey:VNWKTOKETHGBQD-UHFFFAOYSA-N Copy. CAS Registry Number: 74-82-8. Chemical structure: This structure is also available as a 2d Mol file or as a computed 3d SD file The 3d structure may be viewed using Java or Javascript .The structure on the right is the Lewis electron structure, or Lewis structure, for H 2 O. With two bonding pairs and two lone pairs, the oxygen atom has now completed its octet. Moreover, by sharing a bonding pair with oxygen, each hydrogen atom now has a full valence shell of two electrons. Chemists usually indicate a bonding pair by a single ...Transcribed image text: Draw the Lewis structure of nitromethane CH3NO2, clearly indicating resonance contributors as well as non-bonding pairs of electrons and formal charges, as relevant. Draw the curved arrows that shows conversion from one resonance structure to another. Finally, draw a resonance hybrid for nitromethane CH3NO2. (6 points)Identify the Lewis structure for methane to understand how its electrons are distributed before considering any acid or base behavior. 1. Consider Lewis structure for methane (CH4). H a. If methane were to behave as an acid (if possible), draw the Lewis structure of its resulting conjugate base. b. Reflecting on your answer for Part A and using ...Hey everyone, welcome to the Mentor Center! In today's video, I draw out the Lewis dot structure for CH4, commonly known as methane.👍 Like 📽️ Subscribe ...cf4 lewis structure and other important details regarding tetrafluoro methane is going to be discussed in this article. Tetrafluoro methane, CF 4 is a haloalkane or halo methane formed by replacing four hydrogen atoms of methane with fluorine atoms. It is a colorless, odourless gas which is used as refrigerant.Hey everyone, welcome to the Mentor Center! In today's video, I draw out the Lewis dot structure for CH4, commonly known as methane.👍 Like 📽️ Subscribe ...28 Jan 2021 ... Cuál es la ESTRUCTURA de LEWIS del METANO? CH4 . Método [RÁPIDO Y FÁCIL]. Suscríbete: https://bit.ly/2HLUw9Z Consigue los problemas del ...While the regulation of surface oxygen vacancy (V O) of ceria is an effective methodology to construct solid frustrated Lewis pairs (FLPs), the intrinsic properties and potential applications of solid FLPs are not well-demonstrated.Herein, we present a theoretical study on the formation rules and dynamic behaviors of FLPs on CeO 2 (110) …The Lewis structure gives us meaningful information about the bonds between atoms, but Lewis structures do not depict how the molecule exists in three-dimensions. Depicted on the left in Figure 1 is the Lewis structure for methane (CH 4) showing the central carbon atom singly bonded to four hydrogen atoms: Figure 1.I quickly take you through how to draw the Lewis Structure of CH3CH3 (Ethane). I also go over hybridization, shape, sigma, pi bonding and bond angles.In order to calculate the formal charges for CH4 we'll use the equation:Formal charge = [# of valence electrons] - [nonbonding val electrons] - [bonding elec...Question: Lewis structures of group T compounds Draw Lewis structures for each of the following molecule or ion: • Methane, CH4 • Ammonia, NH3 • Water, H20 • Borane, BH3 • Sulfur dioxide, SO2 • Carbon dioxide, CO2 Upload an image of your drawn structures, include the number of valence electrons and the number of pairs of electrons for each.The Lewis electron structure for the NH 4+ ion is as follows: The nitrogen atom shares four bonding pairs of electrons, and a neutral nitrogen atom has five valence electrons. Using Equation 4.4.1, the formal charge on the nitrogen atom is therefore. formalcharge (N)=5− (0+82)=0 .The figure above represents a valid Lewis structure for methane. All electrons are used up, and all atoms have a noble gas electron configuration. Note that methane (CH 4 _4 4 ) doesn't have resonance structures because CH 4 _4 4 can be represented with one Lewis structure.The first two alkenes in Table 13.1.1 13.1. 1, ethene and propene, are most often called by their common names—ethylene and propylene, respectively (Figure 13.1.1 13.1. 1 ). Ethylene is a major commercial chemical. The US chemical industry produces about 25 billion kilograms of ethylene annually, more than any other synthetic organic …Here's what the perfect email consists of: brevity, a...Methane (CH4) is a colorless, odorless, and highly combustible gas that is utilized to generate energy and heat houses all over the world.The CH4 Lewis structure comprises two different atoms: carbon and hydrogen. It is a nonpolar molecule with a bond angle of 109.5°. CH4 is utilized in chemical processes to create other essential gases such as hydrogen and carbon monoxide, as well as carbon ...Draw a Lewis structure for the molecule or ion which satisfies the rules provided in the procedure. C. Build a model of the molecule and have it checked by the instructor. D. Use your model to dete ne the molecular geometry for this molecule (don't try to guess the geometry without the model): tetra- hedral, trigonal pyramidal, trigonal planar ...a) Draw Lewis structures for methane (CH4) and formaldehyde (H. 5. a) Draw Lewis structures for methane (CH4) and formaldehyde (H2CO). b) What is the hybridization at the carbon atom in CH4 and H2CO? c) The carbon atom in CH4cannot participate in multiple bonding, whereas that in H2CO can. Explain this observation by using the hybridization at ...PROBLEM 4.2.4 4.2. 4. Methanol, H 3 COH, is used as the fuel in some race cars. Ethanol, C 2 H 5 OH, is used extensively as motor fuel in Brazil. Both methanol and ethanol produce CO 2 and H 2 O when they burn. Write the chemical equations for these combustion reactions using Lewis structures instead of chemical formulas.A Lewis dot structure for SeO3 is drawn with an Se in the center, with two lines connecting it to two Os and one double line connecting it to an O. The Os connected by single lines...A good example is methane (CH 4). According to valence bond theory, the structure of a covalent species can be depicted using a Lewis structure. Experimentally, it has been shown that the four carbon-hydrogen bonds in the methane molecule are identical, meaning they have the same bond energy and the same bond length.QUESTION 19 Draw the Lewis structure for methane (CH4). Make sure to indicate the total number of valence electrons for partial credit. You may draw on paper, take a picture, and upload it to this question. Alternatively, you may describe the structure using words (for instance, CO2 would be "carbon double bonded to two oxygens with two lone ...28 Jan 2021 ... Cuál es la ESTRUCTURA de LEWIS del METANO? CH4 . Método [RÁPIDO Y FÁCIL]. Suscríbete: https://bit.ly/2HLUw9Z Consigue los problemas del ...Remember that a Lewis dot structure is an approximation of the actual arrangement of electrons in a molecule or polyatomic ion, much in the same way a cartoon of a cat is an approximation of the actual animal. Our cartoon picture of a molecule is limited, but can give us a rough idea the bonds that hold a polyatomic chemical species together ...Exercise 3.15.1 3.15. 1. Draw a Lewis structure that represents the compound that is formed when bromine and phosphorus bond with one another. Answer. 3.15: Covalent Bonding: Drawing Lewis Structures of Covalent Molecules is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.A step-by-step explanation of how to draw the SF4 Lewis Dot Structure (Sulfur tetrafluoride).For the SF4 structure use the periodic table to find the total n...In this detailed guide, we will walk you through the process of drawing the Lewis structure for CH₂Cl₂ (dichloromethane), a molecule used in various chemical applications. Step-by-Step Guide to Drawing the Lewis Structure of CH2Cl2 1. Find the Total Valence Electrons Begin by determining the total number of valence electrons in CH2Cl2. Carbon (C) contributesQuestion: Lewis structures of group T compounds Draw Lewis structures for each of the following molecule or ion: • Methane, CH4 • Ammonia, NH3 • Water, H20 • Borane, BH3 • Sulfur dioxide, SO2 • Carbon dioxide, CO2 Upload an image of your drawn structures, include the number of valence electrons and the number of pairs of electrons for each.Carbon needs two double bonds, one to each of the two oxygens, to complete its octet. The atoms *share* electrons with each other because they are both non-m...Readout CH4 lewis structure. Sources of Methane (CH4) Gas • Fossil fuels are significant sources of methane gas • About 30 percent of methane gas comes from wetlands (including ponds, lakes, and rivers) • Termites produce methane gas daily. • Oceans are one of the natural sources of methane. About 10 percent of natural methane comes ...Hey everyone, welcome to the Mentor Center! In today's video, I draw out the Lewis dot structure for CH4, commonly known as methane.👍 Like 📽️ Subscribe ...This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: Draw the Lewis structure for the methane (CH4) molecule. ء ☺ 0: | с 01 w х 5 ? Draw the Lewis structure for the selenium dioxide (SeO2) molecule.Dimethyl sulfone (DMSO 2) is an organosulfur compound with the formula (CH 3) 2 SO 2.It is also known by several other names including methyl sulfone and (especially in alternative medicine) methylsulfonylmethane (MSM). This colorless solid features the sulfonyl functional group and is the simplest of the sulfones. It is relatively inert chemically and is able to resist decomposition at ...a) Draw Lewis structures for methane (CH4) and formaldehyde (H. 5. a) Draw Lewis structures for methane (CH4) and formaldehyde (H2CO). b) What is the hybridization at the carbon atom in CH4 and H2CO? c) The carbon atom in CH4cannot participate in multiple bonding, whereas that in H2CO can. Explain this observation by using the hybridization at ...You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: Draw the Lewis structure of methane, CH4, which is the major component of natural gas. Select the correct answer below: :-C-: H-H-C-H-H H-C-H H-C-H. Here’s the best way to solve it. Consider that carbon needs four additional electrons to ...Lewis Dot of Tetrachloromethane (aka Carbon Tetrachloride) In the carbon tetrachloridemolecule, fourchlorineatomsare positioned symmetrically as corners in atetrahedralconfiguration joined to a centralcarbonatom by singlecovalent bonds. Because of this symmetrical geometry, CCl4is non-polar.Methane gashas the same structure, making carbon ...The Lewis structure for methane (CH4) depicts one carbon atom in the center, bonded to four hydrogen atoms forming a tetrahedral structure. There are no extra lone pairs of electrons. The Lewis structure for methane, also known as CH4, is a depiction of the arrangement of valence electrons around atoms in a molecule.Methane, with the chemical formula CH4, is a simple hydrocarbon compound consisting of one carbon atom bonded to four hydrogen atoms. To construct the Lewis dot diagram for methane, we need to consider the valence electrons of each atom. The carbon atom in methane has four valence electrons, while each hydrogen atom has one valence electron.This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer. Question: 2. Draw the Lewis Dot Structure for methane, CH. According to VSEPR theory, what is the molecular geometry of methane? What are the predicted bond angles?Check me out: http://www.chemistnate.comC2H6 lewis structure: Ethane Hybridization, Molecular Geometry and shape. Ethane is an organic compound with a chemical formula of C2H6. It is a colorless and odorless molecule that exists as a gas at the standard room temperature. This compound is one of the simplest hydrocarbons to exist having a single bond between carbon atoms.The structure on the right is the Lewis electron structure, or Lewis structure, for H 2 O. With two bonding pairs and two lone pairs, the oxygen atom has now completed its octet. Moreover, by sharing a bonding pair with oxygen, each hydrogen atom now has a full valence shell of two electrons. Chemists usually indicate a bonding pair by a single ...Steps of drawing BrF4- lewis structure Step 1: Find the total valence electrons in BrF4- ion. In order to find the total valence electrons in BrF4- ion, first of all you should know the valence electrons present in bromine atom as well as fluorine atom. (Valence electrons are the electrons that are present in the outermost orbit of any atom.). Here, I'll tell you how you can easily find the ...Methane (US: / ˈ m ɛ θ eɪ n / METH-ayn, UK: / ˈ m iː θ eɪ n / MEE-thayn) is a chemical compound with the chemical formula CH 4 (one carbon atom bonded to four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas.The abundance of methane on Earth makes it an economically attractive fuel, although capturing and storing it is hard because ...Methane, nitro-. Formula: CH 3 NO 2. Molecular weight: 61.0400. IUPAC Standard InChI: InChI=1S/CH3NO2/c1-2 (3)4/h1H3. Copy Sheet of paper on top of another sheet. IUPAC Standard InChIKey: LYGJENNIWJXYER-UHFFFAOYSA-N. Copy Sheet of paper on top of another sheet. CAS Registry Number: 75-52-5. Chemical structure:CH₄ is a covalent compound formed from one carbon and four hydrogen atoms. It is the simplest hydrocarbon and have the name methane.CH₄ is its molecular formula. What is molecular formula? Molecular formula of a compound is used to represent a molecule by its elements present in the molecule. Where as Lewis formula or representation is drawn as dotted atoms with valence electrons.A step-by-step explanation of how to draw the CO2 Lewis Dot Structure (Carbon dioxide).For the CO2 structure use the periodic table to find the total number ...In order to calculate the formal charges for CH4 we'll use the equation:Formal charge = [# of valence electrons] - [nonbonding val electrons] - [bonding elec...A guide to write methane CH4 lewis structure, very easy to follow, step by step. Find more about chemistry tips at https://chembarcode.comThe Lewis structure for methane (CH4) and ethane (C2H6) are given below:Methane (CH4):Ethane (C2H6):Now, to predict which of these molecules would have a higher boiling point, we need to understand the concept of intermolecular forces.Boiling point is a measure of the strength of intermolecular forces in a substance. The stronger …Question: Lewis structures of group T compounds Draw Lewis structures for each of the following molecule or ion: . Methane, CH4 • Ammonia, NH3 • Water, H20 • Borane, BH3 • Sulfur dioxide, SO2 • Carbon dioxide, CO2 Upload an image of your drawn structures, include the number of valence electrons and the number of pairs of electrons for each.Answered: Below is the Lewis structure of the… | bartleby. Science. Chemistry. Below is the Lewis structure of the methane (CH,) molecule. H. .. H:C:H .. H Count the number of bonding pairs and the number of lone pairs around the carbon atom. bonding pairs: lone pairs: Below is the Lewis structure of the methane (CH,) molecule.Dr. B. explains how to draw the Lewis dot structure for CH4 (methane). The CH 4 Lewis Structure is one of the most frequently tested Lewis Structures. Note that hydrogen atoms always go on the outside of a Lewis dot structure. This is because they can share a maximum of two electrons. Once they have two valence electrons their outer shell is ...Here's the best way to solve it. Neon ( Noble gas ) atomic number = 10 , 1s2 ,2s2,2p6 Total valence electrons (means electrons in outerm …. Practice Exercise 2 Compare the Lewis symbol for neon with the Lewis structure for methane, CH4. How many valence electrons are in each structure?Structures that show all the bonds, atoms, and any valence electrons that are not in bonds, but do not attempt to accurately represent the 3D shape of a molecule are called Lewis structures. The Lewis structure for methane (see above) and the molecular formula \(\mathrm{CH}_{4}\) represent a chemical shorthand that can provide a huge amount of ...The Methane (CH4) lewis structure is made up of one carbon atom that is situated at the middle position and four hydrogens atoms that are at the surrounding position. CH4 molecular geometry is tetrahedral and its electron geometry is also tetrahedral. The bond angle of CH4 is 109.5º.Kekulé structures are similar to Lewis Structures, but instead of covalent bonds being represented by electron dots, the two shared electrons are shown by a line. ... The two-electron bond, which is illustrated by the carbon-hydrogen bonds in methane or ethane and the carbon-carbon bond in ethane, is called a single bond. In these and many ...Figure 7.17 The molecular structure of the methane molecule, CH 4, is shown with a tetrahedral arrangement of the hydrogen atoms.VSEPR structures like this one are often drawn using the wedge and dash notation, in which solid lines represent bonds in the plane of the page, solid wedges represent bonds coming up out of the plane, and dashed lines represent bonds going down into the plane.28 Jan 2021 ... Cuál es la ESTRUCTURA de LEWIS del METANO? CH4 . Método [RÁPIDO Y FÁCIL]. Suscríbete: https://bit.ly/2HLUw9Z Consigue los problemas del ...In order to calculate the formal charges for CH4 we'll use the equation:Formal charge = [# of valence electrons] - [nonbonding val electrons] - [bonding elec...In this video, we're going to look at how to draw dot structures of simple organic molecules that have single bonds. So if I look at the molecular formula CH4, which is methane, and I want to draw a dot structure for the methane molecule, I would go over here to my organic periodic table and find carbon. And I can see carbon is in group IV.This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer. Question: Draw a Lewis structure of methane, CH4. Draw the Lewis structures of ethane, CzHe and propane Draw Lewis structures of butane, C4H10. Show transcribed image text. There are 2 steps to solve this one.Our purpose in this chapter is to be able to represent the structure of a molecule. When we draw the Lewis structure for methane, it is only a 2-dimensional representation, but really the compound has a three-dimensional shape. The central carbon in methane is tetrahedral, with the four hydrogens at the alternate corners of a cube.A good example is methane (CH 4). According to valence bond theory, the structure of a covalent species can be depicted using a Lewis structure. Experimentally, it has been shown that the four carbon-hydrogen bonds in the methane molecule are identical, meaning they have the same bond energy and the same bond length.Draw the Lewis structure, indicate the molecular structure, and indicate the bond angles for CO. Draw the Lewis structures of each of the following compounds and identify the species that have trigonal pyramidal molecular shapes. a. ClO2- b. BH3 c. NH3 d. SO32-Draw a Lewis structure for each molecule and determine its molecular geometry.Learn how to draw the lewis structure of methane (CH4), a naturally occurring gas and a greenhouse gas, using valence electrons, octet rule, and VSEPR t…Steps of drawing lewis structure of CH 3 Br. There are several steps to draw the lewis structure of CH 3 Br. Each step is explained in detail in this tutorial. Find total number of electrons of the valance shells of hydrogen, oxygen atoms and carbon atom. Determine total electrons pairs as lone pairs and bonds. Find center atom and basic sketch.While the regulation of surface oxygen vacancy (V O) of ceria is an effective methodology to construct solid frustrated Lewis pairs (FLPs), the intrinsic properties and potential applications of solid FLPs are not well-demonstrated.Herein, we present a theoretical study on the formation rules and dynamic behaviors of FLPs on CeO 2 (110) …

Drawing C is a Lewis electron dot structure for methane. Figure 1 Alternative Representations of Methane. Lewis Electron Dot Structures. Figure 2 animates the rules for drawing a Lewis electron dot structure using C 2 H 6 as an example. Click within the figure to view the animation.. Skewered meat dish crossword clue

Steps for Writing Lewis Structures. Example 3.4.1 3.4. 1. 1. Determine the total number of valence electrons in the molecule or ion. Each H atom (group 1) has 1 valence electron, and the O atom (group 16) has 6 valence electrons, for a total of 8 valence electrons. 2.Lewis Structure of Methane. Carbon belongs to group \(14\) of the Periodic Table and has \(4\) electrons in its valence shell. These electrons are represented by dots around the chemical symbol of carbon. As there are four valence electrons, it needs four more electrons to complete its octet configuration. This deficiency of four electrons is ...3D Model of Methane. Chemistry in Context December 2, 2019. Failed to load structure from its database. Source: PubChem. This is a three-dimensional rendering of methane. Click on the structure to rotate it and view it from various angles. This is a three-dimensional rendering of methane.Let’s find the lewis structure of CH4. In this example video we will walk through the steps to finding the lewis structure of methane (CH4). We begin by find...On the left, we have the dot structure for methane. And we've seen in an earlier video that this carbon is sp3 hybridized, which means that the atoms around that central carbon atom are arranged in a tetrahedral geometry. It's very difficult to see tetrahedral geometry on a two-dimensional Lewis dot structure.Our purpose in this chapter is to be able to represent the structure of a molecule. When we draw the Lewis structure for methane, it is only a 2-dimensional representation, but really the compound has a three-dimensional shape. The central carbon in methane is tetrahedral, with the four hydrogens at the alternate corners of a cube.VSEPR CH. 4. Methane. CONTROLS. Valence Shell Electron Pair Repulsion. Methane has 4 regions of electron density around the central carbon atom (4 bonds, no lone pairs). The resulting shape is a regular tetrahedron with H-C-H angles of 109.5°.See Answer. Question: 4a. Draw the Lewis Structure for methane and use it to complete the following table. Report Table LS.4a: Drawing Dichloroethene (CCl2CH2) Table view List view4c. Are these results for CCl2CH2 consistent with what you observed in Avogadro (within a few degrees)? Explain briefly. (4pts) Upload an image showing your drawn ...Study with Quizlet and memorize flashcards containing terms like which bond is the most polar?, Considering the electronegativity values indicated in the table, which covalent bond has the least degree of polarity?, What is the lewis structure for chloroethylene (c2h3cl) and more.Lewis Dot of Methane. CH 4. Back. 70 More Lewis Dot Structures. Since all the atoms are in either period 1 or 2, this molecule will adhere to the octet rule. The exception, of course, being the hydrogen's. They follow the duet rule (2 electrons). Methane is the first member of the alkane series.The Lewis structures of methane, the carbonate ion, carbon dioxide, and the sulfite ion are given. Methane, CH Carbonate ion, CO Carbon dioxide, CO2 Sulfite ion, so H Ö== H- * -CH H :0 Predict the molecular shape of methane, Predict the molecular shape of the carbonate ion. bent linear trigonal planar (120°) linear trigonal pyramidal trigonal pyramidal trigonal planar (120) bent tetrahedral ...A step-by-step explanation of how to draw the CH3OH Lewis Structure.When you see a carbon with an OH attached (like CH3OH, C2H5OH, etc.) that means that he O...What is the Lewis dot structure, kekule structure, and the orbital diagram of. 1. Methane. 2. CCl4. 3. CH2Cl2. please explain. There are 4 steps to solve this one..

Popular Topics