Question | Answer |
chemistry | cience thats deals with the matter of the universe and the changes they under go |
theory | explaination that has stood up to much testing and observation |
natural law | summary of observation |
scientific method | process used to make and explain discoveries to solve problems |
matter | has mass and occupies space |
compound | atoms of different elements chemically combined |
element | cannot be separated into similar substances |
solid | has a fixed shape and volume |
liquid | has a fixed volume but assumes shape of its container |
gas | no fixed volume or shape |
physical properties | inherent characteristics of a substance |
chemical properties | ability to form new substances |
physical change | composition of a substince is not affected |
chemical change | a new substance is formed |
physical properties | density/harness, color/odor, melting/boiling pint |
nucleus | dense, positively charged center of an atom; proton and neutron |
mass number | sum of the protons and the number of neutrons in the nucleus of an atom |
electron | negetivley charged subatomic particle |
isotopes | atom with same number of protons but different number of neutrons |
ion | atom with a charge |
polyatomic ions | ions containg several atoms |
binary ionic compounds | metal and nonmetal bonded together |
D=m/v | formula for density |
average atomic mass | weighted aaverage of all of the isotopes of an element |
mole | 6.022x 10^23 atoms |
chemical reaction | process in which a new substance is formed |
reactant | substance that enters into a chemical reaction |
product | written on the right side of the arrow in a chemical equation |
coefficient | numbers used to balancce chemical equations |