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Elements and Compounds
Atoms
Bonding
Water
Acids and Bases
100
Anything that occupies space and has mass
What is matter?
100
subatomic particle with a single unit of negative electrical charge
What is an electron?
100
chemical bond in which atoms transfer electrons
What is an ionic bond?
100
tendency of molecules of the same kind to stick to one another
What is cohesion?
100
uniform mixture of two or more substances
What is a solution?
200
substance containing two or more elements chemically combined in a fixed ratio
What is a compound?
200
The number of protons in an atom
What is the atomic number?
200
Electrically charged atoms
What are ions?
200
measure of average energy of random motion of particles
What is temperature?
200
substance that is dissolved
What is a solute?
300
pure substance that cannot be broken down into another substance by chemical means
What is an element?
300
The location where electrons are found in an atom
What is an electron cloud? (or energy level)
300
Two or more atoms held together by covalent bonds
What is a molecule?
300
attraction that allows water to flow up plant tubes
What is adhesion?
300
compound that removes H+ ions from an aqueous solution
What is a base?
400
Elements that make up less than 0.01% of your body mass
What are trace elements?
400
Alternate forms of elements with different numbers of neutrons
What are isotopes?
400
Starting materials for a reaction
What are reactants
400
molecule with an internal separation of electric charge
What is a polar molecule?
400
accepts H+ ions when levels rise and donates H+ ions when levels fall
What is a buffer?
500
four elements that make up 96% of living matter
What are oxygen, carbon, hydrogen, and nitrogen?
500
Electrons in the outer energy level that bond
What are valence electrons?
500
changes that break chemical bonds to form new ones
What are chemical reactions?
500
weak attraction between hydrogen atoms in water
What is a hydrogen bond?
500
a scale that measures the amount of hydrogen ions in a solution
What is the pH scale?