Which statement is an example of an observation a scientist would make to classify a rock? A rock is larger than other rocks.
A rock was found in a stream.
A rock is formed from molten lava.
A rock cracks in half after a rainstorm.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Which type of intermolecular attractions holds ammonia molecules together with other ammonia molecules?

The density of the solid phase of a substance is 0.90 g/cm3 and the density of the liquid phase is 1.0 g/cm3. a large increase in pressure will a. lower the freezing point b. raise the freezing point c. lower the boiling point d. raise the triple point e. lower the triple point