In which of the following cases is a polar covalent bond formed?
A) when an electron is transferred from one atom to another
B) when the electrons of a bond are shared equally by the two atoms
C) when the electrons of a bond are shared unequally by the two atoms
D) when a metallic element forms a bond with a non-metallic element
C
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In some areas of the world, streams have a steep gradient and constant flow of water so hydroelectricity may be generated without a reservoir.
Answer the following statement true (T) or false (F)
Which zone changes the least with latitude?
A. abyssal B. epipelagic C. neritic D. littoral E. photic
What might be the contemporary basis for conflicting claims to the Arctic?
A) potential for energy resources B) old Cold War grudges C) colonial expansion D) shifting sea ice formations E) the proximity of South American and African countries
________ is a deposit of calcite that forms around hot springs.
A. Hematite B. Travertine C. Sinter D. Stalactite E. Quartz