39. What occurs as a salt dissolves in water?
(1) The number of ions in the solution
decreases, and the freezing point decreases.
(2) The number of ions in the solution
decreases, and the freezing point increases.
(3) The number of ions in the solution increases,
and the freezing point decreases.
(4) The number of ions in the solution increases,
and the freezing point increases.

4

Explanation:

Salt is NaCl right? when it is added it dissociates thus releasing ions thereby increasing the amount of ions in the solution.

As you might know when the weather is low leading to snow people salt their surroundings making the snow to melt. The snow will melt if its freezing point has been increased thus a lower temperature will be needed to turn it back to snow.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.