23 terms

Introduction to Matter Vocabulary

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Acid
pH of less than 7
Base
pH greater than 7
pH
Scale used to classify solutions
catalyst
substance that speeds up the rate of a chemical reaction
Chemical Change
A change that occurs when one or more substances change into entirely new substances with different properties.
Chemical Properties
Characteristic that cannot be observed without altering the substance
Compound
A substance made up of atoms of two or more different elements joined by chemical bonds
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
an element that is shiny and that conducts heat and electricity well; elements with similar properties found on the left side of the "staircase" on the periodic table
Metalloid
an element that has properties of both metals and nonmetals; 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 or easily seen
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
an arrangement of elements in which the elements are separated into groups based on a set of repeating properties; 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
A characteristic of a pure substance that can be observed without changing it into another substance
Precipitate
A solid that forms from a solution during a chemical reaction.
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 that are located on the left side of the arrow in a chemical equation