Idon't understand what to put on the left lines i'm confused can anyone ?

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

Given that 1 mi = 1760 yd, determine what conver- sion factor is appropriate to convert 1849 yd to miles; to convert 2.781 mi to yards.

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work