Explain what happens when: (Support your answer with balanced chemical equations)
a) Magnesium ribbon is burnt in air.
b) An iron nail is left in the garden for a number of days.
c) Sulphur dioxide is dissolved in water.

yes the answer is total mass in unchanged   : )

the term hydride is commonly named after binary compounds that hydrogen forms with other elements of the periodic table. hydride compounds in general form with almost any element, except a few noble gases. the trends and properties vary according to the type of intermolecular force that bonds the elements together, the temperature, its molecular masses, and other components. hydrides are classified into three major groups, depending on what elements the hydrogen bonds to. the three major groups are covalent, ionic, and metallic hydrides. formally, hydride is known as the negative ion of a hydrogen, h-, also called a hydride ion. because of this negative charge, hydrides have reducing, or basic properties. its special characteristics will be further discussed.

explanation: