Biology 1406 - Chapter 2 Review questions well answered

Biology 1406 - Chapter 2 Review questions well answeredMatter - correct answer Anything that has mass and takes up space The three types of matter? - correct answer Liquid, Solid, and Gas Element - correct answer A pure substance that cannot be broken down into simpler substances by physical or chemical means Essential element - correct answer A chemical element required for an organism to survive, grow, and reproduce Trace essential element - correct answer Required trace elements? Percentage? - correct answer Oxygen (65%), Carbon (18.5%), Hydrogen (9.5%), Nitrogen (3.3%) = 96.3% Compound - correct answer A substance consisting of two or more elements in a fixed ratio (H2) Atom - correct answer Smallest unit of matter that retains the properties of an element Subatomic particles? Their charge (If any)? - correct answer Neutrons (0 electrical charge) - Protons (+ electrical charge) - Electrons (- electrical charge) Atomic nucleus and the components that make it up? - correct answer The center of an atom that contains protons and neutrons Atomic number - correct answer Equals the number of protons in the nucleus (never changes)