Question | Answer |
study of matter | chemistry |
anything that occupies space & has mass | matter |
quantitity of matter | mass |
pull of gravity | weight |
pure substance that can be broken down into a simpler kind of matter | elements |
center of the atom | nucleus |
has a positive charge | protons |
the nunber of protons in an element & it identifies the element | atomic number |
are neutral, no charge | neutrons |
what makes up the atomic mass? | protons & neutrons |
electrons have a _________ charge | negative charge |
elements with the same number of protons & a different number of neutrons | isotope |
all elements have ________ | isotopes |
2 or more different elements bonded together | compound |
2 or more elements covalently bonded together | molecule |
2 atoms share a pair of electons | covalent bond |
atoms give & take electrons | ionic bond |
enegry available for work | free energy |
energy in storage | potential energy |
energy in motion | kinetic energy |
breaking of bonds and forming of new bonds | chemical reaction |
matter can neither be created nor destroyed only changed | law of conservation of matter |
involves the release of energy | exeronic reaction |
endogonic reaction | involves the absoprtion of energy |
amount of energy needed to start a reaction | activation energy |
speeds up rate of a reaction | catalyst |
2 parts of a mixture | solute & solvent |
substance that dissolves | solute |
substance in which the solute is dissolved | solvent |
water is the solvent in an ________ solution | aqueus |
measurement of the amount of solute dissolved in the solution | concentration |
exess amount of hydrogen | acid |
exess amount of hydroxide | base |
on the pH scale, the closer to 0 the _______ the acid | stonger |
neutralizes long amount of acid or base | buffer |
changes color in presence of what your testing for | indicator |
when pleaced into base tuyrbs blue but when placed into acid stays red | red litmuus paper |
when placed into a base stays blue but when placed into an acid turns red | blue litmus paper |
changes to various colors based on how acidic or basic the substance is | pH paper |