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AC-HPAT Prep: Chemistry | 50 Actual Questions and
Answers 100% Correct| Latest Update 202 5 - 2026
What is an atom? ✔✔An 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? ✔✔A negatively charged subatomic particle.
What is a proton? ✔✔a 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: ✔✔The atomic number.
What is the mass number? ✔✔The sum of protons and neutrons in the nucleus of the atom.
What is the atomic number? ✔✔The number of protons int the atom, specific for each element.
What is an isotope? ✔✔Atoms 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? ✔✔The weighted average of an isotope's masses.
What is the mass number of an atom with 60 protons, 60 electrons, and 75 neutrons? ✔✔ 135
What is the atomic number of an atom with 17 protons, 17 electrons, and 20 neutrons? ✔✔ 17
An atom with an atomic number of 58 and an atomic mass of 118 has how many neutrons? ✔✔ 60
The mass of an atom is almost entirely contributed by its: ✔✔Nucleus
If an atom consists of 9 protons and 10 neutrons, it's number of electrons is: ✔✔ 9
What is a valance shell? ✔✔The 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? ✔✔The volume of space where certain electrons of specific energy are restricted to move around the nucleus.
What is an anion? ✔✔A negatively charged ion. It is the result of a gained electron. Most anions are non-mettalic.
What is a cation? ✔✔A positively charged ion. It is the result of a lossed electron. Most cations are metallic.
What is an ionic compound? ✔✔A compound formed by combining an anion and a cation.
What is an ionic bond? ✔✔The attractive electrostatic forces between a cation and an anion.
What is a covalent bond? ✔✔A type of bond formed when two atoms share one or more pairs of electrons to acheive an octet of electrons.
What is electronegativity? ✔✔The 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? ✔✔The result of a covalent bond between two atoms of different electronegativities.
What is an Alkene? ✔✔An unsaturated hydrocarbon that contains at least one carbon-carbon double bond.
What is an alkyne? ✔✔An unsaturated carbon that contains at least one carbon-carbon triple bond.
What is an aromatic hydrocarbon? ✔✔A compound with a structure based on benzene: a ring of six carbon atoms.
What is an isomer? ✔✔A compound with the same molecular formula as another compound, but a different molecular structure.
What is an alcohol? ✔✔An 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. ✔✔True.
Since 12-C's molar mass is 12 grams, 48 grams of 12-C atoms would be equal to moles. ✔✔4.
The International Committee for Weights and Measures (ICWM) defines one mole as the number of atoms in exactly: ✔✔12g of Carbon-12.
Molar mass is a numerical value that represents. ✔✔The 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. ✔✔False.
One mole of boron is equivalent to how many grams? ✔✔10.81 g.
The mass of one mole of water is: ✔✔18.02 g.
The amount of a substance equal in grams to the sum of the atomic masses is a(n): ✔✔Mole.
The mass in grams of one mole of oxygen gas is: ✔✔32 g.
3.42 moles of CaO is equivalent to: ✔✔192 g CaO.
