Which process is a chemical change?
1. freezing of liquid water to solid ice
2. condensation of gaseous steam to liquid water
3. boiling of liquid water to gaseous steam
4. decomposing of water to hydrogen gas and oxygen gas

Find the mass in grams of hydrogen gas produced when 14.0 moles of hcl is added to an excess amount of magnesium.

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

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate