Which of the following most likely happens when the volume of a gas increases? The Number of collisions of gas particles remains same
The number of collisions of gas particles increases
The pressure of the gas remains same
The pressure of the gas decreases

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged