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Lewis structureDescription of how to draw Lewis structures for a compound of type EX n from the composition of the molecule.
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VSEPR IntroDescription of how the shape of a molecule depends on the number of electron pair domains for molecules with two, three or four bonding pair domains.Questions 4Identifying particular elements with specified properties from their position in the given periodic table.Atomic number/periodic tableIntroducing the fact that the arrangement of elements in the periodic table is based on their atomic number.Questions 3Three question pages that involve given information about any of atomic number, mass(nucleon) number, number of protons, number of neutrons and number of electrons to deduce the others.Questions 2Two examples where one of atomic number, number of electrons or number of protons is given and the other two are deduced.Atomic numberIntroduction to the atomic number for elements and how atomic number can be used to deduce the number of protons and the number of electrons in an atom.Questions1Four question pages where users identify the regions in the atom, identify subatomic particles with given properties and find that the number of protons and electrons on an atom are equal.IntroductionDescribes nuclear atom along with the masses and charges of the subatomic particles (electrons, neutrons, protons).Particle viewThe review page shows a particle view of the three states of matter and describes differences in the speed of the particles and the extent of motion of the particles in the solid, liquid and gas state. The questions following highlight what happens at the particle level with various state changes including some where students identify which picture correctly represents at a particle level the specified state of a substance.The questions following ask the user whether particular state changes release or absorb energy from the surroundings. Energy and change of stateThe review page highlights the change in the energy of the sample with the various changes of states.Questions ask the user to identify the state from its properties, from the temperature of the sample (given melting and boiling temperatures) and to name the various state changes. States of matterThe review page introduces the states of matter and differences (volume occupied, shape taken.) between them as well as giving names to the various changes of state.