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Chemistry II

Chemistry Review II

Catalyst A substance that speeds up a chemical reaction by reducing the activation energy needed.
Reactants The substances on the left side of a chemical equation
Nucleus The part of the atom that gives it its mass
Ductile Metals can be drawn into thin wires because they are ______
Metals Elements to the left of the zigzag line on the Periodic table
Noble Gasses Elements in family 18 are called ______
Hydrogen there are 2 atoms of ____ in a molecule of water
Compound Two or more different elements chemically bonded
Malleable Metals can be hammered into thin sheets because they are ___
Positive A nucleus has this type of charge
Yields The arrow in a chemical equation
Water A surprising byproduct of a burning candle
Molecule 2 or more atoms chemically bonded
Balanced A chemical equation with the same atoms before and after the reaction
Homogeneous A mixture that appears to be just one substance
Subscript A # that cannot be changed when balancing chemical equations
Endothermic A reaction in which heat energy is drawn in
Precipitate A solid that forms out of 2 liquids reacting
Isotope Atoms of the same element with different #'s of neutrons
Family Elements found in a column on the Periodic table
Alkali Metals The family with the most highly active solids
Proton What is the positive subatomic part of an atom
Neutral What type of charge does a neutron have?
Matter A word that refers to all the substance in the universe
Sodium A deadly element that is a part of the salt molecule
Coefficients The numbers that can be changed to balance a chemical equation
Valence The # of electrons on the outer energy shell of an atom
Chemical Reaction Something that must happen to form a compound
Metalloids Elements that have properties of both metals and non metals
Period Elements who’s atoms all have the same # of energy rings
Molecule At least 2 atoms chemically bonded
Periodic Something with a regular repeating pattern is also called __________
Democritus The first person to propose the idea of the atom
Rutherford His experiment showed that atoms are mostly empty space
Thomson His experiment gave evidence of electrons
Mixture 2 or more substances mixed but not chemically bonded
Noblegases Elements in family 18 are called _________
Alkalimetals The family with the most highly active solids
Transmutation When an atom decays and becomes another element
Halflife The amount of time it takes half of a radioactive sample to decay
Created by: coach_fletcher
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