Is a single property such as density sufficient to always correctly identify a substance?

What quantity do units represent in value

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical

Refer to your lab guide and review the data in table b to complete each statement. the mass of g1 + g2 after the collision kg. the velocity of g1 + g2 after the collision m/s. the momentum of the combined gliders after the collision kg · m/s.