Why is salt thrown on the frozen road ?
- 2 Answers
- 4382 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / guest
One unique propety of water is that its solid form is less
dense than its liquid form. This is why ice floats and
also why lakes don't freeze from the bottom up. In the
liquid form, water molecules at any given moment react with
an average of 3.6 other molecules of water. As liquid
water cools it becomes most dense at 4C. When it reaches
its freezing point at 0C, the molecules arrange themselves
so that they are reacting with exactly 4 other molecules of
water, expansion.
When salt(NaCl) is added to water it separates into Na+ and
Cl- and the water molecules form a hydration shell around
them. Now, when water reaches its freezing point, its
regular ice structure is disrupted by the presense of these
hydration shells around Na+ and Cl-. This effect is best
demonstated by icebergs. The ice forms a jagged structure
mostly underwater. Water normally freezes in sheets.
The salt is not actually lowering waters freezing point,
water is still chemically the same. The salt is just
disrupting ice formation (hypothetical-it will still take
lower temperatures to have noticable ice formation). You
will have better driving conditons when the roads do turn
icy. You won't have a slick layer of ice anymore...for a
period of time at least.
| Is This Answer Correct ? | 6 Yes | 1 No |
Answer / guest
When salt is thrown on the frozen read, the ice melts
because ice tales heat From the salt having higher
temperature than ice.
| Is This Answer Correct ? | 4 Yes | 7 No |
How are pka and strength of a weak acid related?
What s the difference between hard and soft coal ?
however ozone is havier than oxygen still ozone is up there in sky why?
Which gas is used in bleaching powder.
Which element is liquid at ordinary temperature ?
Of what substance are lead pencils made ?
What is General Properties of Bases ?
Does domestic/household used kerosene oil which is available in blue color (In India) can change its color over the due course of time say 8-10 years if keeping in plastic bottle? If so, in which color it will be turned to change, yellow or transparent or any other color. Please provide me the reply with strong technical approach. Since it has been asked during an interview. Please reply fast. I will be thankful to you if anyone can provide the supporting journals/write-ups/reference to favour of response.
What is wave length?
What test will you use to distinguish cotton from wool ?
State beer-lambert’s law.
Explain the following ? Isotope, Isobars, Stable configuration, Electronic Theory of Valency, Valency
Organic Chemistry 
