ACS Chemistry Final Exam Questions and Answers | Latest Update 2026/2027 100% Guaranteed Success

ACS Chemistry Final Exam Questions and Answers | Latest Update 2026/2027 100% Guaranteed Success Layout of an element (mass # & atomic #) - answeratomic number = - answer-# of protons mass number = - answer-# of protons + neutrons the number of protons in a neutral atom will equal the - answer-# of electrons how to find the correct number of neutrons - answer-mass number - atomic number Forms of the same elements that differ in amount of neutrons - answer-isotopes What particle, if lost from the nucleus, would NOT cause a change in the atomic number? - answer-a neutron because it has no charge When alpha particles were shot at a metal foil target, most passed through without deflections, while others deflected at large angles. What did this suggest to Rutherford? - answer-that the atoms of the metal were mostly empty space, while the nucleus consisted of most of the mass which included highly condensed positive particles (which caused the deflection).An atom has a valence shell configuration of 1s1. To which group of elements on the periodic table does it belong? - answer-IA alkali metals electromagnetic spectrum - answerThe greater the wavelength of a photon..? - answer-the lower its frequency The greater the frequency of a photon...? - answer-the shorter its wavelength Light energy formula - answerWhat does C in the light energy formula represent? - answerGive the ground-state electron configuration of an atom in the second period - answer-1s2 2s1 Electrons configuration rule that states electrons do not pair until they have to. (put one electrons in each electron domain then pair up) - answer-Hund's rule An experimental phenomena associated with atoms having unpaired electrons - which states such substances are attracted to magnetic fields - answer-Paramagnetism Which drop in energy level results in the greatest emission of energy? - answer-n=2 to n=1 quantum numbers - answerWhat do the 4 quantum numbers stand for? - answer-n = energy levell = (n-1) ml -l to l mn 1/2 or -1/2 (spin) List the quantum numbers for the s, p, d, and f orbitals - answer-s 1,0,0 p 2, 1, -1-0-1 d 3, 2, -2--1-0-1-2 f 4, 3 -3--2--1-0-1-2-3 Py orbital - answerWhich element is represented by X - answer-Chromium What two subatomic particles have the most mass, but occupy very little of the volume of an atom - answer-protons and neutrons Define Isoelectronic - answer-Having the same amount of electrons How does a sodium ion differ from a sodium atom? - answer-the sodium ion has fewer electrons two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties - answer-isomer two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are all ________ of carbon. - answer-allotropesWhat makes up an alpha particle? - answer-2 protons and 2 neutrons What did Millikan discover from his oil drop experiments? - answer-the magnitude of the charge on an electron Periods vs Groups - answerwhen an atom of an electropositive atom becomes an ion it..? - answer-becomes larger Nearly all the mass in an atom is located _________ because both ______ & ______ are located there, and each of these particles have a mass larger than the ______ - answer-inside the nucleus protons & neutrons electron Classify the following as an element, compound, or mixture. If it is a mixture, decide if it is a homogeneous or heterogeneous mixture. 1 Sugar 2 Spaghetti Sauce 3 Phosphorus - answer-1 compound, not a mixture 2 mixture, heterogenous 3 element Properties that do depend on the amount of matter present. - answer-extensive Dz^2 orbital - answerDxy orbital - answerDx^2y^2 orbital - answerList the shape, electron domain geometry, and predicted bond angle of a molecule with 6 electron domains - answer-Octahedral 90º List the electron domain geometry & molecular geometry of a molecule with 4 electron domains (4 bonding 0 nonbonding) - answer-electron domain geometry: tetrahedral molecular geometry: tetrahedral List the electron domain geometry & molecular geometry of a molecule with 4 electron domains (3 bonding 1 nonbonding) - answer-electron domain geometry: tetrahedral molecular geometry: trigonal pyramidal ex: NH3 List the electron domain geometry & molecular geometry of a molecule with 3 electron domains (2 bonding 1nonbonding) - answer-electron domain geometry: trigonal planar molecular geometry: bent List the electron domain geometry & molecular geometry of a molecule with 3 electron domains (3 bonding 0 nonbonding) - answer-electron domain geometry: trigonal planar molecular geometry: trigonal planar List the electron domain geometry & molecular geometry of a molecule with 2 electron domains (2 bonding 0 nonbonding) - answer-electron domain geometry: linearmolecular geometry: linear