BJU 6th Science – Chapter 7

Question Answer
Chemistry study of matter
Atom smallest piece of an element
Element substance containing only one kind of atom
Nucleus center section of an atom
Proton positive charge
Neutron no charge
Atomic mass sum of protons and neutrons
Electron negatively charged
Shell average distance of the electrons from the nucleus
Atomic number number of protons in an atom’s nucleus
Atomic theory scientists ideas about atoms
Particle accelerator atom smasher
Chemical symbol abbreviations for elements
Periodic table of the elements classification system
Period horizontal rows of periodic table
Group vertical columns of table
Family color coded groups on periodic table
Molecule atoms joined together
Chemical reaction a chemical change
Compound molecules produced by a reaction
Chemical formula symbols and numbers used to abbreviate a compound
Closed outer most shell of an atom is full
Covalent bond atoms sharing pairs of electrons
Ion atom that has gained or lost an electron
Positive ion an atom with fewer electrons than usual
Negative ion an atom with more electrons than usual
Ionic bond positive and negative ions attracted to each other
Endothermic reaction reaction that uses heat energy
Exothermic reaction reaction the produces heat
Acid form hydrogen ions when dissolved in water
Base form hydroxide ions when dissolved in water
Alkali bases that dissolve in water
pH scale “power of hydrogen”; numbered from 0-14
indicator changes color when exposed to acid or base
neutral pH of 7.0
neutralize when an acid and base combine and “cancel “each other out
salt ionic compound formed during a reaction with a base and an acid

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