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30 Cards in this Set

  • Front
  • Back
anything that occupies space and has mass
ex: heart
physical change
doesnt alter basic nature of a substance
ex: perspiration, chewing
chemical change
does alter basic nature of a substance
ex: digestion
the ability to do work
ex: ATP
kinetic energy
energy of motion
Ex: moving, running
potential energy
stored energy
ex: glucose molecules
chemical energy
energy formed stored in chemical bonds
ex: breaking phosphates in ATP
mechanical energy
energy form directly involved in putting matter into motion
ex: brain activity
electrical energy
energy form resulting from the movement of charged particles
ex:muscles pulling on bones
radiant energy
energy of the electromagnetic spectrum, which includes heat, light, ultra-violent waves, infrared waves, and other forms.
ex:UV Rays
any of the building blocks of matter: oxygen, hydrogen, carbon, for example.
ex: oxygen
the smallest part of an element; invisible by ordinary chemical means.
ex: carbon
subatomic particle that bears a positive charge; located in the atomic nucleus
ex: carbon proton
uncharged subatomic particle; found in the atomic nucleus
ex: carbon neutron
negatively charged subatomic particle; orbits the atomic nucleus
ex: carbon electron
atomic number
the number of protons in an atom
ex: 1- hydrogen
atomic mass
the sum of the number of protons and neutrons in the nucleus of an atom
ex: helium-4
atomic weight
average of the massnumbers all isotopes of an element
ex: helium-4
different atomic form of the same element. vary only in the number of neutrons they contain
ex: carbon-14
particle consisting of 2 or more atoms held together by chemical bonds
ex: water, oxygen
substance composed of 2 or more different elements, the atoms if which are chemically united
ex: methane, hydrogen, oxygen
ionic bond
bond formed by the complete transfer of electrons from one atom to another. the resulting charged atoms, or ions, are oppositley charged and attract eachother
ex: NaCl
covalent bond
a bond involving the sharing of electrons between atoms
ex: water, carbon dioxide
synthesis reaction
chemical reaction in which larger molecules are formed from simpilar ones.
ex: protein molecule
decompostion reaction
a desrtuctive chemical reaction in which complex substances are broken down into simpiler ones.
ex :H20 decomposes
exchange reaction
a chemical reaction in which bonds are both made and broken atoms become combined with different atoms
ex: ATP becomes ADP
ionic compound that dissociates into charged particles when dissolved in water.
ex:calcium, sodium chloride
a substance thatliberates hydrogen ions when in an aqueous solution
ex: HCl
a substance that accepts hydrogen ions; proton acceptors
ex: NaOH, sodium bicarbonate
an atom with a positive or negative electric charge
ex: sodium, chlorine, Na+