By Greg Willie
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Extra resources for A comprehensive dictionary of chemistry
They also move in straight-line trajectories through the pinhole. • electric charge charge. a property used to explain attractions and repulsions between certain objects. Two types of charge are possible: negative and positive. Objects with different charge attract; objects with the same charge repel each other. . """"""""""""""""""""""""""""""""""""""""""",,4=7 I charge do not coincide. For ; example, a hydrogen chloride : (HCI) molecule is an electric ~ dipole because bonding elecI trons are on average closer to : the chlorine atom than the I : hydrogen, producing a partial I positive charge on the H end ; and a partial negative charge on the Cl end.
Compare with net ionic equation. A balanced equation that describes a reaction occurring in solution, in which all strong elec- Chemistry 35 ~ trolytes are written as disso; ciated ions. ~ _ com ound : compa~e with element and ~ mixture. A compound is a ma; terial formed from elements : chemically combined in defi~ nite proportions by mass. For I example, water is formed ~ from chemically bound hydro: gen and oxygen. Any pure ~ water sample contains 2 g of ; hydrogen for every 16 g of : oxygen.
A polydentate ligand I and dz orbitals; those d orbit2 II = = = = = = = Chemistry II efflorescent I electrical conductivity als within a set with lobes directed along the x-, y-, and zaxes. • eftlorescent efflorescence; efflorescing. Compare with deliquescent and hygroscopic . Effiorescent substances lose water of crystallisation to the air. The loss of water changes the crystal structure, often producing a powdery crust. • effusion effuse. Compare with diffusion and diffraction . Gas molecules in a container escape from tiny pinholes into a vacuum with dle same average velocity they have inside the container.