Modeling Molecules Introduction: You can represent a molecule two-dimensionally‚ as a structural formula or electron dot structure. Although such models are useful in certain contexts‚ they do not accurately represent bond angles between atoms or shapes of molecules. In this activity‚ you will construct three-dimensional models of several molecules. You will use electron dot structures and structural formulas to inform how you construct the three-dimensional models. Materials: jelly beans‚ gum
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Molecular modelling is the general term used to describe the use of computers to construct molecules and perform a variety of calculations on these molecules in order to predict their chemical characteristics and behaviour. The term molecular modelling is often used synonymously with the term computational chemistry. Computational chemistry is a broader term‚ referring to any use of computers to study chemical systems. Some chemists use the term computational quantum chemistry to refer to the use
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droplet form. Also‚ when the glass and wax sheets were flipped‚ the water remained on the glass and fell off the wax paper. This is due to adhesion; the water molecules stuck to the glass molecules and prevented the droplet from falling when the glass was turned upside down. Water is polar. Its electrons are unevenly distributed among the molecule with two unshared electron pairs on the oxygen atom. The hydrogen atoms align themselves along one side of the oxygen atom‚ causing a slightly positive and
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Valence-Shell Electron-Pair Repulsion Theory (VSEPR) Predicting the Shapes of Molecules There is no direct relationship between the formula of a compound and the shape of its molecules. The shapes of these molecules can be predicted from their Lewis structures‚ however‚ with a model developed about 30 years ago‚ known as the valence-shell electron-pair repulsion (VSEPR) theory. The VSEPR theory assumes that each atom in a molecule will achieve a geometry that minimizes the repulsion between electrons
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INTRODUCTION A hydrated salt is a crystallize salt molecule that is weakly attached to a certain number of water molecules. Salt is created when an acid’s anion (negative ions) and a base’s cation (positive ions) are combined to produce an acid-base molecule. A salt molecule that is not bound to any water molecules is an anhydrate‚ and a salt molecule that is bound to water molecules is a hydrated salt. In a hydrated salt‚ the water molecules are transforming into the crystalline structure of the
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point is 74 - 77° C. It is a stable white crystalline powder‚ slightly soluble in water and very soluble in ethanol. Its formula is also written (CH3)2CHCH2C6H4CH(CH3)COOH‚ which lays out the chemical structure of ibuprofen. Ibuprofen is a chiral molecule‚ meaning that two mirror-image forms (called enantiomers) are possible. In the diagram‚ the wavy line represents a molecular bond that is bent "upward" for so-called (R)-ibuprofen and "downward" for (S)-ibuprofen
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compounds; and ●Determine the molecular structure of identified compounds. 2. Theory Building models of molecules are useful for visualizing how atoms are connected in three-dimensional space called molecular geometry‚ which is best predicted by Valence-Shell Electron-Pair Repulsion (VSPER) theory. The following are the sets of rules summarizing thsi theory: ● Consider molecules and ions where two or more atoms are bonded to a central atom. ● The electron pairs in the valence shell of the
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distribution of electrons in order to understand the chemical properties of reactivity and molecules like texture and microstructure. One of the most important influences
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a living system is that it is composed of non-living molecules and atoms. Biochemistry is basically that the pursuit of knowledge of what goes on chemically within a living system is classifies as such. Although there are thousands of different types of molecules in a cell‚ only few are bimolecular like the four common macromolecules and many more. Proteins and carbohydrates are important factors of our food. To add onto‚ some simple molecules like vitamins and mineral salts also have a crucial part
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CHAPTER 4 REVISION 1. How many moles of silver atoms are in 0.780 grams of silver? a) 0.78 moles b) 0.00723 moles c) 84.2 moles d) 0.522 moles 2. What is the molar mass of Mg(BrO4)2? a) 312 g mol-1 b) 232 g mol-1 c) 168.2 g mol-1 d) 477 g mol-1 3. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W‚ atomic number = 74)? a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4 d) FeSO4 4. A compound contains 20.2%
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