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Three molecules have similar electron domains, but different molecular shapes. Why? The ________ hydrogen orbital overlaps with...

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Chemistry

Three molecules have similar electron domains, but differentmolecular shapes. Why?

The ________ hydrogen orbital overlaps with the ________ bromideorbital in HBr. (Valence Bond Theory)

The temperature and pressure specified by STP are ______ °C and_______ atm.

Calculate the density of hydrogen gas (in g/L) at 43.0 °C and700.0 torr.

How many molecules are there in 4.00 L of oxygen gas at 500 °Cand 50.0 torr?

Answer & Explanation Solved by verified expert
4.4 Ratings (916 Votes)
1 The geometry of a moleculeincludes a description of the arrangements of the atoms in themolecule At a simple level the molecular structure tell us whichatoms are bonded to which At a more detailed level the geometryincludes the lengths of all of these bonds that is the distancesbetween the atoms which are bonded together and the angles betweenpairs of bonds For example we find that in water H2OH2O the twohydrogens are bonded to the oxygen and each OHOH bond length is9572pm9572pm where 1pm1012m1pm1012m Furthermore H2OH2O isa bent molecule with the HOHHOH angle equal to 1045o1045oThe measurement of these geometric properties is difficultinvolving the measurement of the frequencies at which the moleculerotates in the gas phase In molecules in crystalline form thegeometry of the molecule is revealed by irradiating the crystalwith xrays and analyzing the patterns formed as the xraysdiffract off of the crystalNot all triatomic molecules arebent however As a common example CO2CO2 is a linear moleculeLarger polyatomics can have a variety of shapes as illustrated inFigure 71 Ammonia NH3NH3 is a pyramidshaped molecule with thehydrogens in an equilateral triangle the nitrogen above the planeof the triangle and a HNHHNH angle equal to 107o107o Thegeometry of CH4CH4is that of a tetrahedron with all HCHHCHangles equal to 1095o1095o See also Figure 71 EthaneC2H6C2H6 has a geometry related to that of methane The twocarbons are bonded together and each is bonded to three hydrogensEach HCHHCH angle is 1095o1095o and each HCCHCC angle is1095o1095o By contrast in ethene C2H4C2H4 each HCHHCHbond angle is 1166o1166o and each HCCHCC bond angle is1217o1217o All six atoms of ethene lie in the same plane Thusethene and ethane have very different geometries despite thesimilarities in their molecular    See Answer
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