When a perfume bottle is opened, some liquid changes to gas and the fragrance spreads around the room. which sentence explains this?
a gases do not have a definite volume.
b the particles of gases are closely packed.
c the force of attraction between particles in gases is very high.
d gases are not matter.

Compare and contrast physical changes with chemical changes.

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Acontrol during an experiment. might change remains constant does not exist does change