This polar bear lives where it is very cold. Its skin is black and that helps absorb heat. The polar bear also has thick layers of fat called blubber. What is this blubber used for? A) It helps the polar bear swim in the ocean. B) It insulates and keeps the polar bear warm. C) Females use the fat to feed the baby polar bears. D) Only males have fat and it is used to attract a mate.

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

Apush or pull that moves or changes and object when to objects touch