BIOL 1201: Exam 1 Questions And Answers!!

A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) _____. - Answer-element Organisms are largely composed of __ elements. - Answer-11 About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? - Answer-carbon, hydrogen, nitrogen, and oxygen What determines solubility? - Answer-"like dissolves like" Atom - Answer-Smallest unit of matter that retains all the properties of that element What is the mass and charge of protons? - Answer-Mass: 1 Dalton Charge: +1 What is the mass and charge of neutrons? - Answer-Mass: 1 Dalton No charge What is the mass and charge of electrons? - Answer-Mass: close to none (about 1/10000 that of a proton or neutron) Charge: -1 Which subatomic particle(s) always have a positive charge? - Answer-protons Atomic Number - Answer-equal to the number of protons in an atoms In a neutral atom, the atomic number is equal to... - Answer-the number of protons What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons? - Answer-6From its atomic number of 15, it is possible to predict that phosphorus always has ___. - Answer-15 protons Atomic Mass - Answer-the sum of the number of protons and neutrons in an atom Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have? - Answer-10 neutrons An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many protons does boron have? - Answer-5 protons Changing the number of _____ would change an atom into an atom of a different element. - Answerprotons Isotopes - Answer-variants of an atom that have different atomic masses due to differing numbers of neutrons What refers to atoms with the same atomic number but different atomic masses? - Answer-isotopes