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Transcript
2.4 Revision 1: There were two atoms. One got hit by an extremely electronegative fluorine atom. “Help, I’ve lost an electron”, it cried. “Are you sure?” said the other. “_ _ _ _ _ _ _ _ _ _” it replied. Solve the problems to find the punch line for the joke. 1. 2. 3. 4. 5. 6. 7. 8. How many valence electron in a molecule of H2O? …………….. What shape is a molecule of methane? …………………………... What shape is a molecule of CO2? ………………………… What shape is a molecule of NCl3? ……………………….. What shape is a molecule of AlBr3? ……………………… How many valence electrons in the outer shell of an O2- ion?………….. Which of these molecules is polar; C2H4, CH3OH, CCl4? ………… How many neutrons in the nucleus of an atom with atomic number 7 and atomic mass 15? ………. 9. Which is the most electronegative; S, N, H, C? …………….. 10. Which atom is the smallest; Na, Al, P, Cl? …………….. Answers: A B C D E F G H I J K L M N O P Q R S T U V W X F H 9 5 Cl S C Na 8 Al H P Tetrahedral Cu Triangular pyramid Linear C2H4 P Flat triangle CH3OH CCl4 N Square 12 Types of Solid 1. What type of solid: a. Has the highest melting point? b. Has the lowest melting point? c. Conducts electricity when solid and melted? d. Conducts electricity when dissolved or melted but not as a solid? e. Forces that hold non-polar molecular solids together. f. Can conduct heat and electrical charge. g. Which of the following solids have hydrogen bonds between molecules; hydrogen chloride, calcium, sodium chloride, ammonia, graphite. h. The reason that metals can conduct electricity, heat and can be bent. Little Willie was a chemist. Little Willie is no more. For what he thought was H2O --- ----Answers A B C D E F G H I J K graphit e atoms Sodium chloride Permanen t dipoles chlorine silica ionic hydrogen Halide s calciu m L M N O P Q R S T U V Hydroge chloride Positiv e ions carbo n Ammoni a Valence electrons Covalent bonds Boro n Metal Hydroge n bonds Layers of atoms Vapour molecula r W X Y Z 1 2 3 4 5 6 7 Giant molecula r Force zone triple magnetic distance Temporar y dipoles Tripl e bond Delocalise d electrons Willie Ionic bonds big