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Glossary of 9th grade biology chapter 2

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atom
basic unit of matter
nucleus
the center of an atom
electron
negatively charged particle
element
pure substance
isotope
atoms of the same element with different number of neutrons
compound
combination of two or more elements
ionic bond
having an extra electron
ion
positively and negatively charged atoms
covalent bond
to atoms sharing electrons
molecule
smallest unit of most compounds
van der waals forces
a slight attraction that develops between the oppositely charged regions of nearby molecules
cohesion
an attraction between molecules of the same substance
adhesion
attraction between molecules of different sumbstances
mixture
to or more compounds or elements
solution
ions gradually become dispersed in the water froming a type of micture called a solution 9
solute
the thing that gets dispersed
solvent
the substance in which the solute dissolves in
supension
substances that cant disolve
ph scale
a scale that indicates the concentration of
H+ ions in a solution
acid
any compound that forms H+ ions in solution
base
ia s compound that produces hydroxide ions
buffer
weak acids
monomer
small unit
polymer
small unit
carbohydrate
compound made up of carbon
monosaccharide
single sugar group
polysaccharide
large macromolecule
lipiid
fats
nucleic acid
small hydrogen based
nucleotide
made up of 5 carbon sugar
RNA
single strans of nucleic acid
DNA
nucleic acid that stores info
protein
needed by the body for growth
amino acid
compound with an amino group and a carboxyl group

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