O-Level Chemistry Exam Study Guide Level 1 Solved Question.

Mass in SI Units - correct answer Kg Time in SI Units - correct answer Seconds Temperature in SI Units - correct answer Kelvin -273 Celsius Volume in SI Units - correct answer Meters Cubed Purify a solid from a solid-liquid mixture - correct answer Filtration Purify a dissolved salt from a solution - correct answer Crystalization Purify an Iodine or a Carbon Dioxide from a mixture - correct answer Boil off and Sublimate Separate 2 miscible liquids - correct answer Distillation Separate 1 miscible liquid from a mixture of multiple miscible liquids - correct answer Fractional Distillation Separate 2 non-miscible liquids - correct answer Separating Funnel Separate multiple solutes - correct answer Paper Chromatography Define Atom - correct answer Smallest particle of an element that can participate in a chemical reaction Define Molecule - correct answer A group of 2 or more atoms which are chemically bonded together Define Ion - correct answer A positively or negatively charged particle Define Compound - correct answer Cannot be physically separated. A chemical method is required. Properties different from it's elements Define Mixture - correct answer Can be physically separated. Properties the same as it's components Define Diffusion - correct answer Gases or Liquids mix together by themselves Solids Properties... - correct answer Fixed shape, fixed volume, incompressibility, tightly packed, strong forces between particles, vibrate and rotate about a fixed position Liquid Properties... - correct answer Fixed volume, difficult to compress, closely packed, disorderly, vibrate, rotate, move and collide Gas Properties... - correct answer No fixed volume or shape, easily compressed, random motion, weak forces, vibrate, rotate, move freely, collide often Solid To Liquid Heat Is... - correct answer Absorbed Liquid To Gas Heat Is... - correct answer Absorbed Solid To Gas Heat Is... - correct answer Absorbed Gas To Solid Heat Is... - correct answer Given Out Gas To Liquid Heat Is... - correct answer Given Out Liquid To Solid Heat Is... - correct answer Given Out Avogadro's number - correct answer 6.02x10²³ 1 mole of gas occupies... - correct answer 24 dm³ Atomic Mass... - correct answer Average mass of the isotopes as they occur in nature Isotope - correct answer An element with the same number of protons and electrons but a different number of neutrons. Valence Electrons Are... - correct answer In The Outermost Shell Ionic Formula - correct answer The cation with it's charge and the anion with it's charge in the correct ratios Structural Formula - correct answer The arrangement of atoms in a molecule Every atom wants to... - correct answer attain a full outer shell. Ionic Bonds - correct answer Atoms transfer electrons Covalent Bonds - correct answer Atoms share electrons A cation accepts... - correct answer Proton (Archaic) An anion accepts: - correct answer Electron What state is an ionic compound at room temperature - correct answer Solid Melting and Boiling points of ionic compounds are... - correct answer Very High Ionic Compounds conduct electricity when... - correct answer In aqueous solution or molten state. Ionic Compounds are... - correct answer Non-Volatile Ionic Compounds will... - correct answer Usually dissolve in water Ionic Compounds usually do not... - correct answer Dissolve in organic solvents Covalent Compounds exist as... - correct answer Solids, Liquids, Or Gases. (Usually depending on their molecular size) Covalent Compounds have... - correct answer Low melting and boiling points Covalent Compounds do not... - correct answer Conduct Electricity Covalent Compounds are... - correct answer Volatile Covalent Compounds do not usually... - correct answer Dissolve in water Covalent Compounds usually... - correct answer Dissolve in organic solvents Ions in solid ionic compounds are in... - correct answer Fixed positions in a crystal lattice structure Simple covalent molecules are held together by... - correct answer Weak, intermolecular, Van der Waals forces Ionic ions are held together by... - correct answer Strong electrostatic forces Graphite conducts... - correct answer Electricity