Science help ,Freezing Point of Saltwater Mixture

1. What practical use does adding salt to water have?
A. unfreezing glaciers
B. freezing the ocean
C. keeping ponds liquid
D. melting ice on roads and sidewalks


2. What happened to the freezing point of the water once salt is added?
A. It is lowered.
B. It is raised.
C. It remains the same.


3. What happened to the freezing point of salt water as you added more and more salt?
A. It stayed unchanged at the lower level.
B. It lowered.
C. It rose.
D. It lowered and then rose.

4. What must be added to water for it to boil?
A. heat energy
B. particle motion
C. vibration
D. all of the above


5. Before you add salt to water, what temperature is closest to the one you have to reduce water to in order for ice crystals to form?
A. 10° C
B. 0° C
C. 32° C
D. -4° C







please write the answers something like this


1.~~
2.~~
3.~~
4.~~
5.~~

THANK YOU :)

I really shouldn't answer these - you should find your own answers - Try Wikipedia or other source next time.

1-D
2-A
3-B
4-A
5-B

Pure water freezes at 32 degrees (F) = 0 degrees (C), but a saturated solution of salt, (Sodium Chloride), in otherwise pure water freezes at 0 degrees (F).
(A "Saturated solution" means that the water can hold no more salt.)

yes but these are 3rd grade questions. The key word for No. 1 is "practical" and salt is OFTEN the primary chemical for de-icing highways. The other is dark sand, which improves traction and gets warm during the day and helps melt ice.