Local Knowledge…

There was not much snow in evidence from my balcony yesterday. Since I don’t ski very well I thought this was probably a good thing.

The locals all seemed very confident that it was going to snow but I have little confidence in weather forecasts. It started to snow at about 8pm and it is still snowing now at 3pm the next day. The view from my baclony this morning was much improved!

Really very picturesque and ultimately a good thing for a ski resort I suppose. Everyone copes so well despite the endless inconvenience of have to scrape roads and cars clear. Life just goes on as normal. My response was typically British in that my attempt to walk into town this morning was stopped after about 30 paces by a total loss of traction between shoes and ground. I slid gently to a halt and headed back to the hotel. I am going to try again this afternoon now that grit and salt have been spread on the roads.

A typical snow flake contains about 1019 molecules of water. Each one is added to the core of the flake in various ways and at different rates – this is why it is extremely unlikely that you would ever find two snowflakes that are absolutely identical. They do exist, it is just not very probable that you could identify them.

Questions…

  1. Describe a chemical test for water.
  2. How could you demonstrate that a sample of water was pure.
  3. What happens to the solubility of carbon dioxide in water as the temperature increases?
  4. How many atoms of hydrogen are there in snowflake? (Roughly!)
  5. What process would you use to produce pure water from a salty mixture of slush taken from a snowy road?

SFScience

sfscience.net

Retired Schoolmaster living in Wiltshire and Vendee France

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