Ask questions about projects relating to: aerodynamics or hydrodynamics, astronomy, chemistry, electricity, electronics, physics, or engineering
Moderators: MelissaB, kgudger, Ray Trent, Moderators
I want someone to please explain to me about the above question thanks
- Posts: 1
- Joined: Sat Feb 02, 2013 5:16 am
- Occupation: Student year 11(grade 10)
- Project Question: Chemistry
- Project Due Date: due 30th february
- Project Status: I am just starting
Thank you for your question and welcome to the forum. Salt causes ice to melt and prevents it from re-freezing by lowering the freezing temperature of water. This is called freezing point depression. As the salt dissolves into the water/ice, each molecule of salt breaks into two parts...a sodium ion and a chloride ion. These particles essentially get in the way of water molecules and prevent them from combining with other water molecules to form the stable crystal structure known as ice. This reaction will continue until no more sodium chloride (salt) can dissolve into the solution at a certain temperature. At this point the salt water solution will freeze, but it will be at a much lower temperature than that required for pure water.
I hope this helps.
"As the circle of light increases, so does the circumference of darkness around it."
~ Albert Einstein
- Posts: 229
- Joined: Mon Oct 03, 2011 12:26 pm
- Occupation: US Air Force Space & Missile Operations
- Project Question: "To explain all nature is too difficult a task for any one man. 'Tis much better to do a little with certainty and leave the rest for others that come after you, than to explain all things by conjecture without making sure of anything." - Sir Isaac Newton
- Project Due Date: N/A
- Project Status: Not applicable
Return to Grades 9-12: Physical Science
Who is online
Users browsing this forum: No registered users and 5 guests