Chemical Changes

Question 1

What is chemical changes?

Answer 1

Chemical change is a process where a new substance of different properties as its constituents are formed.

Question 2

Evidence of chemical change?

Answer 2

Effervesecence -> gas evolved, new odour is noticed, formation of precipitate, thermal or light energy is given out, colour change

Question 3

Types of chemical changes? (8) CORNDPP

Answer 3

Combination, oxidation, respiration, neutralisation, decomposition, precipitation, photosynthesis

Question 4

What is an ion?

Answer 4

An ion is a charged particle formed when an atom gains or loses an electron.

Question 5

What is ionic bonding?

Answer 5

Ionic bonding is the electrostatic force of attraction between oppositely-charged ions.

Question 6

What is covalent bonding?

Answer 6

Covalent bonding is the electrostatic force of attraction between the shared pair of electrons and the positive nuclei of the 2 atoms sharing an electron.

Question 7

What is chemical bonding?

Answer 7

Chemical bonding is the electrostatic force of attraction between particles.

Question 8

Law of conservation of chemical change

Answer 8

Matter is neither created nor destroyed. During chemical reaction, number of atoms of reactant is equal to number of atoms of product.