Chemistry Regents Review

In an atom, an orbital represents

• the most probably location of a proton

• the most probable location of an electron

• the least probably location of a neutron

• photons emitted as electrons move to lower energy levels

Which particle has a mass so small, it is considered to be 0 amu?

• proton

• hydrogen nucleus

• neutron

• electron

During a flame test, sodium chloride produces an intense yellow flame. This yellow color is produced when electrons in excited atoms

• are gained by the atoms

• are lost by the atoms

• move to higher energy states within the atoms

• move to lower energy states within the atoms

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What quantity is the same among atoms of the same element?

• mass number

• atomic number

• number of neutrons

• number of nucleons

An atom that has 8 protons and 10 neutrons is an isotope of the element

• nitrogen

• oxygen

• fluorine

• neon

Which elements have the most similar chemical properties?

• Ge, As, and Sb

• Mn, Fe, and Co

• S, Se, and Te

• P, S, and Cl

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In a bond between an atom of hydrogen and an atom of chlorine, the hydrogen atom has a

• weaker attraction for electrons

• stronger attraction for electrons

• smaller number of first-shell atoms

• larger number of first-shell atoms

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Which atom has the lowest electronegativity?

• Nitrogen

• Oxygen

• Fluorine

• Neon

Which temperature is equal to 170 C?

• 103 K

• 443 K

• -103 K

• 498 K

Which statement accurately describes particles of an ideal gas, according to the kinetic molecular theory?

• The distance between the gas particles is much greater than the size of the particles

• As the gas particles collide, the total energy of the system increases

• The gas particles have strong intermolecular forces

• The gas particles move in a circular motion

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