hydrogen, The lightest element and at the same time the most abundant in outer space, nebula, The first stage of a star’s life cycle, helium, The second most abundant element in the universe, big bang theory, The most accepted theory about the formation of the universe that explains why it continues to expand, Mendeleev, Created a classification of elements based on their atomic weight, Electronegativity, The relative ability of a bonded atom to attract shared electron pairs, Tetrahedral, The molecular shape of CHBr3, London forces, Considered as the weakest IMFAs, Surface tension, This refers to the energy required to increase the surface area by a unit amount, ion-dipole, The strongest IMFAs force, Viscosity, The ability of these substances to resist flow i, nucleic acids, Biomolecular group carries and passes on the hereditary information of the organism, carbohydrates, Organic molecule gives fast source of energy, Lipids, nutrient group is used in the composition of waxes and responsible for insulation of some organisms, Enzyme, catalyst in the human body, Limiting Reactant, It is the reactant that produces a lesser amount of product., Excess Reagents, It is the reactants that are not used up when the reaction is finished, non-renewable, Energy that comes from sources that will run out or will not be replenished in our lifetimes—or even in many, many lifetimes, biomass, It refers to the organic matter from plants and animals (microorganisms)., detergent, type of cleaning products which many of the ingredients can be manufactured from plants.

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