Regents Chemistry Midterm Review 2

Which diagram represents a mixture of two different molecular forms of the same element?

• 1
• 2
• 3
• 4

The mass of a proton is approximately equal to the mass of

• an alpha particle
• a beta particle
• a neutron
• a positron

Which list of elements consists of a metal, a metalloid, and a nonmetal?

• Li, Na, Rb
• Cr, Mo, W
• Sn, Si, C
• O, S, Te

Which phrase describes the distribution of charge and the polarity of a CH₄ molecule?

• symmetrical and polar
• symmetrical and nonpolar
• asymmetrical and polar
• asymmetrical and nonpolar

Which equation represents natural transmutation?

• 1
• 2
• 3
• 4

During which time interval is the average kinetic energy of the particles of the substance constant while the potential energy of the particle increases?

• AC
• BC
• CD
• DF

A substance is classified as either an element or a

• compound

• solution

• heterogeneous mixture

• homogeneous mixture

Which particle diagram represents the arrangement of F₂ molecules in a sample of fluorine at 95 K and standard pressure?

• 1

• 2

• 3

• 4

Nuclei of U-238 atoms are

• stable and spontaneously absorb alpha particles

• stable and spontaneously emit alpha particles

• unstable and spontaneously absorb alpha particles

• unstable and spontaneously emit alpha particles

Which numerical setup can be used to determine the atomic mass of lithium?

•  (0.075)(6.02 u) + (0.925)(7.02 u) 

•  (0.925)(6.02 u) + (0.075)(7.02 u) 

•  (7.5)(6.02 u) + (92.5)(7.02 u) 

• (92.5)(6.02 u) + (7.5)(7.02 u)