What are the signs of a tornado?

dark skies, flying debris, and a freight train noise

rain and flying debris

flying debris only

a visible funnel cloud only

plz asap

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?

Adilute aqueous potassium nitrate solution is