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