observation of natural phenomena carried out in a controlled manner so that the results can be duplicated and rational conclusions obtained

Answer:

experiment

concise statement or mathematical equation about a fundamental relationship or regularity of nature

Answer:

law

tentative explanation of some regularity of nature

Answer:

hypothesis

tested explanation of basic natural phenomena

Answer:

theory

the creative process of understanding the physical world that involves hypothesis formation, experimentation, and modification of theory followed by more experimentation

Answer:

scientific method

quantity of matter in a material

Answer:

mass

whatever occupies space and can be perceived by our senses

Answer:

matter

total mass remains constant during a chemical change (chemical reaction)

Answer:

law of conservation of mass

force of gravity exerted on an object

Answer:

weight

liquids and gases: kinds of matter that flow easily and change their shapes in response to slight outside forces

Answer:

fluids