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AC-HPAT Prep| 188 Actual Questions and Answers 100% Correct| Latest Update 2025/2026
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What is an atom? โโAn atom is the basic unit of an element. It is composed of a nucleus and one or more electrons moving around it. What is an electron? โโA negatively charged subatomic particle. What is a proton? โโa stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign. The number of protons in an atom indicates: โโThe atomic number. What is the mass number? โโThe sum of protons and neutrons in the nucleus of the atom. What is the atomic number? โโThe number of protons int the atom, specific for each element. What is an isotope? โโAtoms of the same element that have the same number of protons, but a different number of neutrons. They have identical chemical properties, but different physical properties. What is the atomic mass? โโThe weighted average of an isotope's masses. What is the mass number of an atom with 60 protons, 60 electrons, and 75 neutrons? โโ 135 What is the atomic number of an atom with 17 protons, 17 electrons, and 20 neutrons? โโ 17 An atom with an atomic number of 58 and an atomic mass of 118 has how many neutrons? โโ 60
The mass of an atom is almost entirely contributed by its: โโNucleus If an atom consists of 9 protons and 10 neutrons, it's number of electrons is: โโ 9 What is a valance shell? โโThe last energy level in which loosely held electrons are contained. These are the electrons that engage into bonding and are therefore characteristic of the elements. What is an energy level? โโThe volume of space where certain electrons of specific energy are restricted to move around the nucleus. What is an anion? โโA negatively charged ion. It is the result of a gained electron. Most anions are non-mettalic. What is a cation? โโA positively charged ion. It is the result of a lossed electron. Most cations are metallic. What is an ionic compound? โโA compound formed by combining an anion and a cation. What is an ionic bond? โโThe attractive electrostatic forces between a cation and an anion. What is a covalent bond? โโA type of bond formed when two atoms share one or more pairs of electrons to acheive an octet of electrons. What is electronegativity? โโThe ability of an atom in a bond to attract the electron density more than the other atom(s) in the bond. What is a dipole? โโThe result of a covalent bond between two atoms of different electronegativities.
What is an Alkene? โโAn unsaturated hydrocarbon that contains at least one carbon-carbon double bond. What is an alkyne? โโAn unsaturated carbon that contains at least one carbon-carbon triple bond. What is an aromatic hydrocarbon? โโA compound with a structure based on benzene: a ring of six carbon atoms. What is an isomer? โโA compound with the same molecular formula as another compound, but a different molecular structure. What is an alcohol? โโAn organic compound characterized by the presence of a hydroxyl functional group; -OH. True or False: Avogadro's number acts as the conversion factor for converting between the number of moles in a sample and the number of molecules in the sample. โโTrue. Since 12-C's molar mass is 12 grams, 48 grams of 12-C atoms would be equal to moles. โโ4. The International Committee for Weights and Measures (ICWM) defines one mole as the number of atoms in exactly: โโ12g of Carbon-12. Molar mass is a numerical value that represents. โโThe mass of a substance divided by the amount of that substance. True or False: An element's molar mass and atomic weight are always equal. โโFalse.
One mole of boron is equivalent to how many grams? โโ10.81 g. The mass of one mole of water is: โโ18.02 g. The amount of a substance equal in grams to the sum of the atomic masses is a(n): โโMole. The mass in grams of one mole of oxygen gas is: โโ 32 g. 3.42 moles of CaO is equivalent to: โโ 192 g CaO.