Question

Define the following:-
a) Physical change and chemical change .
b) Acids and bases.
c)What is Neutralisation?
d) Difference between Acids and bases? Any two.
e)What is Mineral acids?
f) What is acid rain?
g)Give example of physical changes and chemical changes.
h) Differences between physical changes and chemical changes? Any two.
i) What is crystallisation?
Answer the questions .
Fast please.....!.....! ​

Answer 1

1. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed. For example, if a piece of paper is cut up into small pieces it still is paper.
2. acid is defined as a compound that gives hydronium ions to another compound—for example, hydrochloric acid gives H+ ions to compounds it reacts with. Brønsted-Lowrybases are compounds that can accept hydronium ions—when ammonia gets a hydronium ion from HCl, it forms the ammonium ion.
3. A reaction between an acidand a base is called neutralization and thisneutralization results in production of water and a salt. Volatile liquids (acids) when mixed with specific substances turn into salts.
4. A mineral acid is an acid derived from one or more inorganic compounds. All mineral acids form hydrogen ions and the conjugate base when dissolved in water.
5. rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulphur and nitrogen oxides which combine with atmospheric water to form acids.
6. Physical Change
7. Chemical Change
8. 1
9. Explanation
10. In a physical change, the molecules are rearranged while their actual composition remains same.
11. In a chemical change, the molecular composition of a substance completely changes and a new substance is formed.
12. 2
13. Example
14. Some example of physical change are freezing of water, melting of wax, boiling of water, etc.
15. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
16. Crystallization is also a chemical solid–liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs. In chemical engineering, crystallization occurs in a crystallizer.

Answer 2

a)physical changes occurs when there is no overall changes

chemical changes occurs when there is a change

b)acids are those substances which have sour in taste

Base are those substance which have bitterin taste.

c)those reaction in which acid react with base to form a neutral or nullify product.

d)acids turns blue to red litmus

base turns red to blue litmus

acid have sour in Taste

base have bitter in taste

e)mineral acids are those acid which we obtain from environment these are also called strong acid

f) acid rains occur when sulphur dioxide dissolve in air than the pollutants rate increases resulting in acid rains

g)physical changes are those in which no new substance is formed

in chemical change new substance is formed

h)crystillisation is a process in which a substance is formed in a pure crystal form....hope it helps..