Regents Chemistry

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

• mass number

• atomic number

• number of neutrons

• number of nucleons

How many electron pairs are shared between the atoms in an N₂ molecule?

• 1

• 2

• 3

• 4

How would you classify NaCl?

• element

• compound

• heterogeneous mixture

• homogeneous mixture

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.HS-PS1-1

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

• nitrogen

• oxygen

• fluorine

• neon

Tags

NGSS.MS-PS1-1

Which elements have the most similar chemical properties?

• Ge, As, and Sb

• Mn, Fe, and Co

• S, Se, and Te

• P, S, and Cl

Tags

NGSS.HS-PS1-1

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

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which temperature is equal to 170 C?

• 103 K

• 443 K

• -103 K

• 498 K