Question | Answer |
the temperature at which a liquid turns into a gas | boiling point |
the electron(s) on the outermost energy level | valence electron |
the temperature at which a solid turns into a liquid | melting point |
a column of elements in the period table of elements | group or family |
when a liquid turns into a gas | vaporization |
a row of elements in the periodic table of elements | period |
a well-mixed mixture containing at lease one liquid | solution |
the orbital paths of electrons around the nucleus of an atom | energy level |
two or more substances that are mixed together but not chemically combined | mixture |
the average mass of one atom of an element | atomic mass |
a substance made of only one type of matter and having definite properties | pure substance |
one or two letters representing an element | atomic symbol |
a substance that cannot be broken down into other substances by chemical or physical means | element |
the number of protons in the nucleus of an atom | atomic number |
a change in a substance that does NOT change its identity | physical change |
a tiny negatively charged particle that moves around the nucleus of an atom | electron |
a change in which one or more substances combine or break apart to form new substances | chemical change |
a small particle in the nucleus of the atom with no electrical charge | neutron |
the smallest particle of an element | atoms |
a positively charged particle in an atom | proton |
two or more atoms chemically combined | molecules |
the resistance of liquid to flowing | viscosity |
the force that holds two atoms together | chemical bond |
The amount of matter in an object | mass |
The measure of the pull of gravity on an object | weight |
how tightly packed molecules are in an object; found by dividing the mass of an object by its volume | density |
the amount of space an object occupies or takes up | volume |
the curved surface of a liquid in a graduated cylinder | meniscus |
a glass or plastic container with markings used to measure the volume of liquids | graduated cylinder |
when one substance moves and takes the place of another | displacement |