Which best explains why graphite is a good lubricant?

Carbon atoms form strong bonds within each graphite layer but weak bonds between layers.

Each carbon atom in graphite forms weak covalent bonds with three other carbon atoms.

Carbon atoms in graphite form alternating single and double bonds.

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Draw the lewis dot structure for each of the following polyatomic ions