Please its urgent
*What happened when vapour con-
denses?
(a) Average veloocity of the molecules
increase
(b) Vapour pressure increases
(c) Average velocity of the mole-
cules decreases
(d) Vapour pressure remains constant.

What happens to isotopes that are unstable?

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

If 15 drops of ethanol from a medical dropper weight 0.60g, how many drops does it takes from a dropper to dispense 1.0ml of ethanol? the density of ethanol is 0.80g/ml