June 2013 Chemistry Regents

According to the wave-mechanical model of the atom, an orbital is a region of the most probable location of

• an alpha particle

• a gamma ray

• an electron

• a proton

Which particles have approximately the same mass?

• an electron and an alpha particle

• an electron and a proton

• a neutron and an alpha particle

• a neutron and a proton

During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when electrons in excited lithium atoms

• are lost by the atoms

• are gained by the atoms

• return to lower energy states within the atoms

• move to higher energy states within the atoms

Tags

NGSS.HS-PS1-2

Compared to the energy and charge of the electrons in the first shell of a Be atom, the electrons in the second shell of this atom have

• less energy and the same charge

• less energy and a different charge

• more energy and the same charge

• more energy and a different charge

Tags

NGSS.HS-PS1-1

Which quantity can vary among atoms of the same element?

• mass number

• atomic number

• number of protons

• number of electrons

Which substances have atoms of the same element but different molecular structures?

• He(g) and Ne(g)

• O₂₍g) and O₃

• K(s) and Na(s)

• P₄(s) and S₈(s)

An atom that has 13 protons and 15 neutrons is an isotope of the element

• nickel

• phosphorus

• aluminum

• silicon

Which elements have the most similar chemical properties?

• Si, As, and Te

• N₂, O₂, and F₂

• Mg, Sr, and Ba

• Ca, Cs, and Cu

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which list includes three types of chemical formulas for organic compounds?

• covalent, metallic, isotopic

• covalent, metallic, molecular

• empirical, structural, isotopic

• empirical, structural, molecular

In a bond between an atom of carbon and an atom of fluorine, the fluorine atom has a

• weaker attraction for electrons

• stronger attraction for electrons

• smaller number of first-shell electrons

• larger number of first-shell electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2