Metal Hydroxides and Oxides Flashcards
Define an oxide
an atom that is bonded with an oxygen atom
What are group 1 and 2 metal oxides
Bases
What are two metal oxides?
Magnesium oxide and Sulfur dioxide
What is magnesium oxide used for (MgO) ?
- dessicant in bags/shoes
- treating stomach acid
Define an acid
contains hydrogen and dissassociates in water to form hydrogen ions (H+)
Define a base
reacts with an acid to form salt + water
Define an alkali?
a base that dissolves in water
What oxides are bases?
Sodium oxide and calcium oxide
What happens when the bases sodium oxide and calcium oxide dissolve in water?
they form metal hydroxides which are alkalis
What is sodium hydroxide used for?
- drain and oven cleaner
- plastics
- soap
What is the formula for hydrochloric acid?
HCl
What is the formula for sulphuric acid?
H2SO4
What is the formula for nitric acid?
HNO3
What is the formula for phosphoric acid?
H3PO4
What is a hydroxide?
An OH- ion
What is a metal hydroxide?
Any metal bonded to an OH- ion
- e.g. magnesium hydroxide or sodium hydroxide
What is calcium hydroxide used for?
- raise pH of acidic soil by farmers
- neutralise acidic waste from factories that produce sulfuric acid
Define amphoteric
substance that can act as an acid or base
- e.g. Al2O3
What can aluminium oxide be used as?
- paint
- dessicant
- sunscreen
- glass
Aluminium oxide can react with hot HCl where it acts as a..
base
Aluminium oxide can react with sodium hydroxide where it acts as an
acid
