09
What happens when ?
a) Metal reacts with water
b) Non-metal reacts with oxygen,
c) Metal reacts with acids.
d) Discuss in brief about the properties of ionic compounds
Answers
Answer:
(a) When a metal react with water,then a metal hydroxide and hydrogen gas is formed. Metal + Water ———> Metal Hydroxide + Hydrogen The intensity of reaction of a metal with water depends on its chemical reactivity.
(b) Non metal react with oxygen to form acidic oxide e.g, A covalent bond forms, where the atoms share electrons to both have 8 (or in some cases 2) electrons in their outermost energy level (shell) When a non metal react with oxygen it form an acidic oxide. Non metal (X) + Oxygen = non metal oxide.
(c) When acids react with metals, they produce a salt and hydrogen gas. Most metals react with acids, but not all. The general equation that describes the chemical reaction between an acid and metal is metal + acid = salt + hydrogen gas. Example: Iron + hydrochloric acid =iron chloride and hydrogen gas (Fe + 2CHI = FeCI2 + H2) .
(d) Properties of Ionic Compounds
1. Ionic Compounds have high boiling and melting points as they’re very strong and require a lot of energy to break.
2. The electrostatic forces of attraction between oppositely charged ions lead to the formation of ions.
3. Ionic compounds form crystals.
4. These compounds are brittle and break into small pieces easily.
5. Electrovalent compounds usually dissolve in water and are insoluble in solvents like oil, petrol, kerosene, etc.
6. Ionic compounds do not conduct electricity in a solid-state but they do conduct electricity in the molten state.
7. In comparison to molecular compounds, ionic compounds have higher enthalpies of fusion and vaporization.
(a) when metal react with Water it form
metal hydroxide and hydrogen are formed.
(b) non-metal oxide is the product
(c) When an acid reacts with metal, a salt and hydrogen are produced.