What chemical change occurs when a more reactive substance replaces a less reactive substance in a compound?
a. oxidative
c. reduction
b. displacement
d. endothermic

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

Which of the following units is not an official si unit? mole liter kilogram ampere