Energy hidden in a definite quantity of substance

Curie is defined as the quantity of radioactive substance which gives ___________ disintegrations per second.

Give the definition of solubility of a substance.

Name one quantity which determines the purity of a substance?

The change in the internal energy of a substance

The change in the internal energy of a substance

Is energy a vector quantity ?

Substance P at -80^(@) C has definite volume but no definite shape and possess fluidity. At -55^(@) C, substance P neither has definite volume nor definite shape. Which of the following could be the melting and boiling points of substance P?