Chemistry Vocab.

  • Acid - pH of less than 7

  • Base - pH of more than 7

  • pH - scale used to classify solutions

  • Catalyst - substance that increases the rate of a chemical reaction

  • Chemical change - result in the formation of one or more new substances with new chemical and physical properties

  • Chemical properties - be recognized only when substances react or do not react chemically with one another, that is, when they undergo a change in composition.

  • Compound - pure substances that are composed of two or more types of elements that are chemically combined

  • Electrons - a negatively charged subatomic particle found outside of the nucleus of the atom

  • Law of conservation of mass - The amount of matter does not change during a chemical reaction, only that the atoms are rearranged to form new substances. This is evidenced in a balanced chemical equation.

  • Metal - elements with similar properties found on the left side of the “staircase” on the periodic table

  • Metalloid - elements with similar properties that create a “staircase” on the periodic table

  • Mixture - physical combinations of two or more different substances that retain their own individual properties and are combined physically (mixed together)

  • Heterogeneous Mixture - is not uniform throughout, the component substances can be visibly distinguished

  • Homogeneous Mixture - is uniform throughout, the substances are evenly mixed and cannot be visibly distinguished

  • Neutrons - a subatomic particle with no charge (neutral) found in the nucleus of the atom.

  • Nonmetal - elements with similar properties found on the right side of the “staircase” on the periodic table

  • Periodic table - a quick reference for associating the name and symbol of an element.

  • Physical change - do not change the composition of a substance, only the physical properties

  • Physical properties - can be observed and measured without changing the kind of matter being studied.

  • Precipitate - a solid substance formed when two solutions are chemically combined.

  • Products - new substances formed in a chemical reaction and that they are located on the right side of the arrow in a chemical equation.

  • Protons - a positive subatomic particle found in the nucleus of an atom.

  • Reactants - substances broken apart or combined in a chemical reaction and that they are located on the left side of the arrow in a chemical equation