Could any one help on this fill in questions​

3)Liming materials come in two types. Those containing only calcium carbonate (CaCO3), calcium hydroxide [Ca(OH)2], or calcium oxide (CaO) are called “calcitic limes.” Pure calcium carbonate is used as the standard for liming materials and is assigned a rating of 100 percent.

4)Metal oxides react with acids to form their corresponding metal salts and water.

5) Bases are compounds that break up into hydroxide (OH-) ions and another compound when placed in an aqueous solution.