Which of the following describe chemical properties?
sugar burns in air to form water and carbon dioxide
water freezes
titanium is less dense than iron
iodine ( a purple solid) becomes a purple gas

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

What is the molar mass of potassium nitrate, kno3

The excretory system,need answers for all: )