Champagne is a solution. When bubbles come off, they are carbon dioxide gas coming out of solution, so the bubbling champagne is a solution with bubbles of gas in it. The champagne is still a solution, but the bubbles are not part of it any more.
No, it gets bubbles from fermentation.
When a bottle of champagne is opened, the pressure inside the bottle causes the cork to pop due to the release of built-up carbon dioxide gas. The bubbles and fizzing in champagne come from dissolved carbon dioxide gas escaping when the bottle is opened.
the CO2 bubbles in the champagne cling to the rough surface of the raisin, making it rise. when it gets to the surface, the bubbles disburse and the raisin sinks.
While non-alcoholic champagnes are available on the market, champagne traditionally contains alcohol.
According to the source I found, "A raisin dropped in a glass of fresh champagne will bounce up and down continually from the bottom of the glass to the top. This is because the carbonation in the drink gets pockets of air stuck in the wrinkles of the raisin, which is light enough to be raised by this air. When it reaches the surface of the champagne, the bubbles pop, and the raisin sinks back to the bottom, starting the cycle over."
It is a physical change.
No, they are both around the same strength, although the 'bubbles' in Champagne help you get 'tipsy' a little quicker.
Yes, the raisin will sink into a glass of champagne, but not for long ... the bubbles from the champagne will inflate the dried raisin and it will float up to the surface.
Sink to the bottom and cause the bubbles to rise. Nothing magical, sometimes you will have it sink then rise again due to a bubble getting trapped in the wrinkles of the raisin. It will make the champagne go flat faster.
Champagne comes from the Champagne region of France.
Many news publications include fairly up to date news on research into bubbles generated by champagne, along with plenty sites for wine enthusiasts who look into these kinds of questions on their own time.