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____  apparent increase in volume caused by reflections, usually arriving within 0.1 second after the original sound

The number of vibrations that occur in 1 second is called 

_____  a change in the direction of travel of light, sound, or other waves crossing a boundary

What is labeled 9 below? A. Metals    B. Alkali Metals   C. Halogens    D. Atomic weight     E. Period     AB. Noble Gases    AC. Alkaline Earth Metals       AD. Transition Elements       AE. Semiconductors   BC. Nonmetals   BD. Atomic number   BE. Periodic Table      

What is labeled 7 below? A. Metals    B. Alkali Metals   C. Halogens    D. Atomic weight     E. Period     AB. Noble Gases    AC. Alkaline Earth Metals       AD. Transition Elements       AE. Semiconductors   BC. Nonmetals   BD. Atomic number   BE. Periodic Table      

What is labeled 4 below? A. Metals    B. Alkali Metals   C. Halogens    D. Atomic weight     E. Period     AB. Noble Gases    AC. Alkaline Earth Metals       AD. Transition Elements       AE. Semiconductors   BC. Nonmetals   BD. Atomic number   BE. Periodic Table      

What is labeled 11 below? A. Metals    B. Alkali Metals   C. Halogens    D. Atomic weight     E. Period     AB. Noble Gases    AC. Alkaline Earth Metals       AD. Transition Elements       AE. Semiconductors   BC. Nonmetals   BD. Atomic number   BE. Periodic Table      

When the equation __Li + __O2→ __Li2O is correctly balanced, what is the sum of the coefficients?

What is the formula when atoms of M and X (pictured below) react to form a stable ionic compound?  

Which one of the following does not have the same units as the others?