The particle pressure of a vapor at the surface of its parent liquid The mass of one formula unit of a substance in atomic mass unitsĪ piece of volumetric glassware, usually graduated in 0.1-mL intervals, that is used to deliver solutions to be used in titrations in a quantitative (dropwise) manner. Outermost electrons of atoms usually those involved in bondingĬombination of symbols that indicates the chemical composition of a substanceĪ solution that contains a higher than saturation concentration of solute slight disturbance or seeding causes crystallization of excess soluteĪ subatomic particle with a positive charge When two or more atoms join together, they form _s The absolute entropy of a substance in its standard state at 298 K The substance that oxidizes another substance and is reducedĪ subatomic particle with a negative chargeĪ heterogeneous mixture in which solute-like particles settle out of solvent-like phase some time after their introductionĪny form of a certain element that contains different numbers of neutrons than the other versions Regular periodic variations of properties of elements with atomic number (and position in the periodic table).Ī spherically symmetrical atomic orbital one per energy levelĪ term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron Method by which hydrophobic (water-repelling) particles of an ore are separated from hydrophilic (water-attracting) particles of a metallurgical pretreatment process. The pressure of the gas above a solution is proportional to the concentration of the gas in the solution The scattering of light by colloidal particlesĮnergy that matter processes by virtue of its motionĪt constant pressure the volume occupied by a definite mass of gas is directly proportional to its absolute temperature.Ī measure of the intensity of heat, i.e. ![]() Pair of electrons residing on one atom and not shared by other atoms unshared pair Weak bases ionize only slightly.Īt the same temperature and pressure, equal volumes of all gases contain the same number of moleculesĪ negative ion an atom or goup of atoms that has gained one or more electronsĪ unit of energy in the SI system. Strong soluable bases are soluble in water and are completely dissociated. The mass of one molecule of a nonionic substance in atomic mass unitsĪ substance that produces OH (aq) ions in aqueous solution. The total pressure exerted by a mixature of gases is the sum of the partial pressures of the individual gases The substance will remain the same through a _changeĬovalent bond resulting from the sharing of two electrons (one pair) between two atomsĪn element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table about 80% of the known elements are metals. ![]() The temperature at which liquid and solid coexist in equilibrium also the freezing pointĭescribes the order in which electrons fill orbitals in atoms The chemistry of substances that contain carbon-hydrogen bondsĪ term used to describe molecules and polyatomic ions that have one atom in the center and six atoms at the corners of a octahedron The comparison demonstrated the new method to be more effective than the conventional method in facilitating the students in constructing knowledge through hands-on learning regarding the structure and characteristics of the periodic table, namely, the periodicity and the predictability of elemental properties.Compounds that contain only carbon and hydrogen.Ī positive ion an atom or group of atoms that has lost one or more electronsĪ hypothetical gas that obeys exactly all postulates of the kinetic-molecular theory The scores of the tests conducted before and after the introduction to the periodic table to the treatment and control groups of the students, by the new and the conventional method, respectively, were analyzed. Students entered symbols of elements in the blank chart in a manner very similar to solving a crossword puzzle by making use of clues provided to them. In the new method, a blank chart of the modern periodic table was used as an educational aid. ![]() The study sample of about 100 students was identified on the basis of a test. This sample comprised over 200 school students learning introductory chemistry in India. A survey to test the effectiveness of this new method relative to the conventional method, involving use of a wall-mounted chart of the periodic table, was conducted on a convenience sample. A simple method to introduce the modern periodic table of elements at the high school level as a game of solving a crossword puzzle is presented here.
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