Science Vocab chapter 2

stephanieyw's version from 2018-09-27 01:42


Question Answer
Atomthe basic unit of matter
Nucleusthe center of an atom, which contains the protons + neutrons; in cells structure that contains the cell's genetic material in the form of DNA
Electronsnegatively charged particle; located in the space surrounding the nucleus
Elementpure substance that consists entirely of one type of atom
compoundthe substance formed by the chemical combination of 2 or more elements in definite proportions
Covenant bondtype of bond between atoms in which the electrons are shared
Moleculesmallest unit of most compounds that displays all the properties of that compound
Hydrogen bondweak attraction between a hydrogen atom and another atom
solutiontype of mixture in which all the components are evenly distributed
monomersmall chemical unit that makes up a polymer
polymermolecules composed of many monomers; makes up macromolecules
monosaccharidesimple sugar molecule
nucleic acidmacromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorus
proteinmacromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair
amino acidcompound with an amino group on one end and a carboxyl group on the other end
chemical reactionprocess that changes, or transforms, one set of chemicals into another set of chemicals
reactantelements of compounds that enter into a chemical reaction
activation energyenergy that is needed to get a reaction started
catalystsubstance that speeds up the rate of a chemical reaction
enzymeprotein catalyst that speeds up the rate of specific biological reactions

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